FUJINO TADASHI
| Emeritus Professor etc. | Emeritus Professor |
- Profile:
1. R&D of modulation and demodulation equipments using FDMA and TDMA for INTELSAT use.
2. R&D of 120Megabit/s trellis coded 8-PSK modem using Ungerboeck code for INTELSAT use.
(This is the first development in the world.)
3. R&D of portable phone set such as PDC、PHS、GSM.
4. MC-CDMA system for combating channel blocking in the frequency-selective Rayleigh fading MIMO
channel.
5. MC-CDMA system improving the bit error ratio.
6. Lattice-reduction aided MMSE detection in MIMO channels.
Researcher Information
Research Keyword
Educational Background
Research Activity Information
Award
Paper
- MMSE Detector Using Forward and Backward Reciprocal-Lattice Reduction in MIMO Systems
Hidekazu Negishi; Wei Hou; Tadashi Fujino
IEEE Int. Symp. on Signal Processing and Information Technology, 2010, 1, Dec. 2010, Peer-reviwed
International conference proceedings, English - An Improved Lattice-Reduction Aided MMSE Detection with SIC and QRM in MIMO Systems
Tomohito Nozoe; Hidekazu Negishi; Tetsuyoshi shimokawa; Tadashi Fujino
Proc. IEEE Int. Symposium on Signal Processing and Information Technology (ISSPIT’10), 2010, Dec. 2010, Peer-reviwed
International conference proceedings, English - A Novel SLM PAPR Reduction of OFDM Signals without Side Information
Toshiharu Kojima; Shohei Iwamoto; Yuki Shida; Tadashi Fujino
Proc. IEEE Int. Symposium on Signal Processing and Information Technology (ISSPIT’10), 2010, Dec. 2010, Peer-reviwed
International conference proceedings, English - A List Detection with partial SIC based on Reciprocal Lattice-Reduction in MIMO Systems
Hou Wei; Tadashi Fujino
Proc. IEEE Int. Symposium on Signal Processing and Information Technology (ISSPIT’10), 2010, Dec. 2010
International conference proceedings, English - Low-complexity MIMO data detection using dural lattice-based reduction
Wei Hou; Hidekazu Negishi; Tadashi Fujino
IEEE Int. conf. on signal processing (ICSP'10), ICSP'2010, Oct. 2010, Peer-reviwed
International conference proceedings, English - A Low Complexity Lattice Reduction Aided Detection Based on Gram-Schmidt
Caio Masakazu Kinoshita; Wei Hou; Tadashi Fujino
IEEE Proc. Int. Conf. on Signal Processing, 2010, 1, Oct. 2010, Peer-reviwed
International conference proceedings, English - An improved lattice reduction aided detection based on Gram-Schmidt procedure
Caio Masakazu Kinoshita; Yusuke Sasaki; Tadashi Fujino
Proceedings - 2010 International Conference on Advanced Technologies for Communications, ATC 2010, 2010, 1, 68-73, 2010, Peer-reviwed, This paper proposes a lattice-reduction aided detection (LRAD) based on the Gram-Schmidt (GS) procedure. In MIMO systems, LRAD achieves good bit error ratios (BERs). The proposed detection method reduces the column vectors of the channel matrix using the LLL algorithm and then the GS procedure to create mutually purely orthogonal column vectors in order to improve BER. The proposed detection method can achieve more reliable estimation of the transmitted signals than the conventional LLL algorithm, and the BERs are improved about 5dB at BER=10-5 for the 8x8 MIMO system over the conventional LLL algorithm. Also the BER curves for the proposed detection is as steep as those for the conventional LRAD. ©2010 IEEE.
International conference proceedings, English - An MMSE detector applying reciprocal-lattice reduction in MIMO systems
Hidekazu Negishi; Wei Hou; Tadashi Fujino
Proceedings - 2010 International Conference on Advanced Technologies for Communications, ATC 2010, 2010, 1, 74-79, 2010, Peer-reviwed, This paper proposes an MMSE detector applying the reciprocal lattice reduction (LR) in MIMO systems. The proposed detector achieves as good as or better BER performances than the LR aided detector using the conventional LLL algorithm and using the Seysen's algorithm in the 4x4 and the 8x8 MIMO systems. It also achieves BER curves to be as steep as or steeper than those using the maximum likelihood detector. ©2010 IEEE.
International conference proceedings, English - A study of SLM PAPR reduction of OFDM signals without side information
Toshiharu Kojima; Yuki Shida; Tadashi Fujino
Proceedings - 2010 International Conference on Advanced Technologies for Communications, ATC 2010, 2010, 1, 168-171, 2010, Peer-reviwed, Selected mapping (SLM) is a well-known technique to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM). SLM generally requires the side information for each OFDM symbol, which leads to decrease the transmitting efficiency. In addition, false side information detection degrades the bit error rate performance significantly. In this paper, we propose a novel SLM scheme without any side information by devising a phase rotation and simple scrambler detection in the receiver. Computer simulation results show that the proposed scheme achieves excellent performances in terms of both PAPR reduction and BER. ©2010 IEEE.
International conference proceedings, English - A Gram-Schmidt based lattice-reduction aided MMSE detection in MIMO systems
Tadashi Fujino; Shinjiro Wakazono; Yusuke Sasaki
Proc. of GLOBECOM 2009, 1, 1, 1, Dec. 2009, Peer-reviwed
International conference proceedings, English - MSE based amtemma selection for MIMO-SDM systems
Thanh Tam Bui; Xuan Nam Tran; Tadashi Fujino
Proc of international conference on advanced technologies for communications, 1, 1, 1, Oct. 2009, Peer-reviwed
International conference proceedings, English - A novel AFC scheme with time diversity combining for helicopter satellite communications
Toshiharu Kojima; Batmunkh Batbaatar; Chuluunsukh Batzorig; Tadashi Fujino
ATC 2009 - Proceedings of the 2009 International Conference on Advanced Technologies for Communications, 2009, 1, 304-307, 2009, Peer-reviwed, In helicopter satellite communications, the periodic blockage of received signal and the carrier frequency fluctuation are the most important problems. In this paper, we propose a novel automatic frequency controller (AFC) scheme with time diversity combining. The proposed AFC generates the frequency error signal based on the time diversity combined signal. The signal-to-noise power ratio (SNR) of the frequency error signal is therefore prevented from falling to zero even in the condition of signal blockage. The proposed AFC thus tracks and removes the carrier frequency fluctuation due to Doppler shift more exactly than the conventional one. Results of computer simulation show that the proposed AFC improves the SNR of the frequency error signal significantly. It is meant that the proposed AFC also improves both of the acquisition characteristics and jitter performance even in the severe environments of the helicopter satellite communications. ©2009 IEEE.
International conference proceedings, English - A combined forward and backward lattice-reduction aided MMSE list detection (Invited paper)
Tadashi Fujino; Tetsuyoshi Shimokawa; Xuan Nam Tran
IEEE ATC 2008, IEEE ATC 2008, Oct. 2008, Peer-reviwed
International conference proceedings, English - A lattice-reduction aided MMSE detection based on Gram-Schemidt orthogonalization
Tadashi Fujino; Yusuke Sasaki
IEEE ATC 2008, IEEE ATC 2008, Oct. 2008, Peer-reviwed
International conference proceedings, English - Iterative lattice reduction aided MMSE list detection in MIMO systems
Tetsuyoshi Shimokawa; Tadashi Fujino
IEEE ATC 2008, IEEE ATC 2008, Oct. 2008, Peer-reviwed
International conference proceedings, English - An improved lattice-reduction aided MMSE with successive interference cancellation
Takanori Yamamoto; Tadashi Fujino
IEEE ATC 2008, IEEE ATC 2008, Oct. 2008, Peer-reviwed
International conference proceedings, English - Pre-detection time diversity combining with accurate AFC for Helicopter satellite communications
Toshiharu Kojima; Chuluunsukh Batzorig; Tadashi Fujino
IEEE ATC 2008, IEEE ATC 2008, Oct. 2008, Peer-reviwed
International conference proceedings, English - Combined forward and backward lattice reduction aided MMSE detection in MIMO system
Tadashi Fujino; Tetsuyoshi Shimokawa
IEEE VTC 2008, IEEE VTC 2008, Sep. 2008, Peer-reviwed
International conference proceedings, English - Improved signal estimation baseed on combined forward and backward lattice reduction in MIMO systems
Tetsuyoshi Shimokawa; Tadashi Fujino
IEEE PIMRC 2008, IEEE PIMRC 2008, Sep. 2008, Peer-reviwed
International conference proceedings, English - Performance comparison of detection methods for combined STBC and SM systems
Xuan Nam Tran; Huan Cong Ho; Tadashi Fujino; Yoshio Karasawa
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E91B, 6, 1734-1742, Jun. 2008, Peer-reviwed, This paper considers detection schemes for the combined space-time block coding and spatial multiplexing (STBC-SM) transmission systems. We propose a symbol detection scheme which allows to extend the limit on the number of transmit antennas imposed by the previous group detection scheme. The proposed scheme allows to double multiplexing gain as well as provides better bit error rate (BER) performance over the group detection scheme. It is shown that the proposed QR-SIC (combined QR-decomposition and successive interference cancellation) symbol detector provides good trade-off between the BER and computational complexity performance and, thus, is the most suitable detector for the combined STBC-SM system.
Scientific journal, English - A low complesity turbo equalizer for SIMO fading channels using polynomial expansion approximation
Dan Lilin; Xuan Nam Tran; Tadashi Fujino
4th Int. Conf. on Mobile COmputing and Ubiquitous Networking, ICMU2008, Jun. 2008, Peer-reviwed
International conference proceedings, English - A quatization scheme for latice-reduction aided MIMO detection
Tien Duc Nguyen; Tadashi Fujino; Xuan Nam Tran
ISSPIT07, ISSPIT07, Dec. 2007, Peer-reviwed
International conference proceedings, English - An improved quantization scheme for lattice-reduction aided MOMO detection
Tien Duc Nguyen; Tadashi Fujino; Xuan Nam Tran
IEEE WRECOM 2007, IEEE WRECOM 2007, Oct. 2007, Peer-reviwed
International conference proceedings, English - Quantization ettro correction for lattice-reduction aided linear detection in MIMO systems
Tien Duc Nguyen; Tadashi Fujino; Xuan Nam Tran
WiMob2007, WiMob2007, Oct. 2007, Peer-reviwed
International conference proceedings, English - Performance of detectors for combined SBC-SM systems
Xuan Nam Tran; C.H.Ho; Tadashi Fujino; Y.Karasawa
ISAP07, ISAP07, Aug. 2007, Peer-reviwed
International conference proceedings, English - Performance of detectors for combined STBC-SM systems
Xuan Nam Tran; C. H. Ho; Tadashi Fujino; Y. Karasawa
IEICE Trans. on Communications, E91-B, 6, Jun. 2007, Peer-reviwed
Scientific journal, English - An improved quantization scheme for lattice-reduction aided MIMO detection
Tien Duc Nguyen; Tadashi Fujino; Xuan Nam Tran
ISCIT2007, ISCIT2007, 2007, Peer-reviwed
International conference proceedings, English - On performance of detectors for combined STBC-SM systems
Xuan Nam Tran; C.H.Ho; Tadashi Fujino
REV2006, REV2006, Nov. 2006, Peer-reviwed
International conference proceedings, English - Dynamic sub-carrier allocation for multiuser OFDMA/TDD networks with full frequency-reuse
Van Duc Nguyen; Xuan Nam Tran; Tadashi Fujino
REV2006, REV2006, Nov. 2006, Peer-reviwed
International conference proceedings, English - Layer error characteristics of lattice-reduction aided V-BLAST detectors
Tien Duc Nguyen; Xuan Nam Tran; Tadashi Fujino
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E89A, 10, 2535-2542, Oct. 2006, Peer-reviwed, Recently, lattice reduction aided (LRA) detectors have been introduced into Vertical Bell-Labs Layered Space-Time (V-BLAST) systems to obtain nearly optimal bit error rate (BER) performance for only small additional complexity. In this paper, the layer error characteristics of LRA-V-BLAST detectors are investigated and compared with those of conventional V-BLAST ones. Two important conclusions are drawn for the LRA-V-BLAST detectors. First, the variation of their mean square error (MSE) within each detection iteration is not as large as in conventional V-BLAST detectors. Second, thanks to lattice reduction there exists an inherent sub-optimal detection order from the last to the first layer. These conclusions allow LRA-V-BLAST detectors to avoid optimal ordering to further reduce the complexity. LRA-V-BLAST detectors without optimal ordering are shown to obtain almost the same BER performance of LRA-V-BLAST detector with optimal ordering.
Scientific journal, English - Layer error characteristics of lattice-reduction aided V-BLAST detectors
Tien Duc Nguyen; Xuan Nam Tran; Tadashi Fujino
IEEE PIMRC 2006, IEEE PIMRC 2006, Sep. 2006, Peer-reviwed
International conference proceedings, English - Combined MMSE-SIC multiuser detection for STBC-OFDM systems
Xuan Nam Tran; Anh Tuan Le; Tadashi Fujino
IEICE, E89B, 5, 280-283, May 2006, Peer-reviwed
Scientific journal, English - A multicarrier CDMA system for combating channel blocking in frequency-selective fading MIMO channel
Tadashi Fujino; Junya Nakamura
IEE 3G&Beyond 2005, IEE 3G&Beyond 2005, Dec. 2005, Peer-reviwed
International conference proceedings, English - Groupwise successive ICE cancellation for OFDM systems in time-varying channels
Xuan Nam Tran; Tadashi Fujino
IEEE ISSPIT 2005, IEEE ISSPIT 2005, Dec. 2005, Peer-reviwed
International conference proceedings, English - A proposal of multicarrier CDMA system for combating channel blocking in frequency-selective fading MIMO channel
Tadashi Fujino; J.Nakamura
IEE 6th international conference on 3G and beyond - 3G 2005, to appear, Nov. 2005, Peer-reviwed
International conference proceedings, English - Combined ML and MMSE Multiuser Detection for STBC-OFDM Systems
A.T.Le; X.N.Tran; Tadashi Fujino
IEICE Trans on Fundamentals, Special Section on Information Theory and Its Application, E88-A, 10, 562-574, Oct. 2005, Peer-reviwed
Scientific journal, English - Performance comparison of MMSE-SIC and MMSE-ML multiuser detectors in a STBC-OFDM system
X.N.Tran; L.A.Tuan; Tadashi Fujino
Personal indoor mobile radio conference 2005, to appear, Sep. 2005, Peer-reviwed
International conference proceedings, English - Combined MMSE-ML detection for wireless MIMO-SDM Communications
Xuan Nam Tran; Tadashi Fujino; Y. Karasawa
ISAP05, ISAP05, Aug. 2005, Peer-reviwed
International conference proceedings, English - An MMSE multiuser detector for space-time block coded OFDM
XN Tran; T Fujino; Y Karasawa
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E88B, 1, 141-149, Jan. 2005, Peer-reviwed, In this paper, we propose a multiuser detection (MUD) scheme for space-time block coded orthogonal frequency division multiplexing (STBC-OFDM) systems. We derive the optimum weight matrix used to decouple simultaneously signals from active multiple access users using the minimum mean square error (MMSE) multiuser detection method. The proposed scheme provides good performance over different models of the frequency selective fading channel. It is also to show that if the length of the cyclic prefix is larger than that of the channel, the performance of the detector depends on only the total energy extracted from multipath components but not the employed channel model, the number of multipath components or the delay of each multipath component.
Scientific journal, English - An anti-blocking multicarrier CDMA system in MISO channel with time diversity
Tadashi Fujino
213-216, Dec. 2004, Peer-reviwed
International conference proceedings, English - On performance of multiuser OFDM systems with transmit diversity
Xuan Nam Tran; Tadashi Fujino; Y. Karasawa
Proc. IEEE Symposium on Signal processing and Information Technology, ISSPIT2004, Dec. 2004, Peer-reviwed
International conference proceedings, English - An anti-blocking multicarrier CDMA system in MISO channel with time diversity
Tadashi Fujino
IEEE Symposium on Signal Processing and Information Technology, ISSPIT2004, Dec. 2004, Peer-reviwed
International conference proceedings, English - Performance analysis of multiple-symbol differential detection for OFDM over both time- and frequency-selective Rayseigh fading channel
Akira Ishii; Hideki Ochiai; Tadashi Fujino
Eurasip, 10, 10, 1536-1545, Oct. 2004, Peer-reviwed
Scientific journal, English - Performance analysis of multiple-symbol differential detection for OFDM over both time- and frequency-selective rayleigh fading channels
Akira Ishi; Hideki Ochlai; Tadashi Fujino
Eurasip Journal on Applied Signal Processing, 2004, 10, 1536-1545, 15 Aug. 2004, Peer-reviwed, The performance of orthogonal frequency-division multiplexing (OFDM) system with multiple-symbol differential detection (MSDD) is analyzed over both time- and frequency-selective Rayleigh fading channels. The optimal decision metrics of time-domain MSDD (TD-MSDD) and frequency-domain MSDD (FD-MSDD) are derived by calculating the exact covariance matrix under the assumption that the guard time is longer than the delay spread, thus causing no effective intersymbol interference (ISI). Since the complexity of calculating the exact covariance matrix turns out to be substantial for FD-MSDD, we also develop a suboptimal metric based on the simplified covariance matrix. The comparative analysis between TD-MSDD and FD-MSDD suggests that the most significant improvement is achieved by the FD-MSDD with the optimal metric and a large symbol observation interval, since the time selectiveness of the channel has a dominant effect on the bit error rate of the OFDM system.
Scientific journal, English - An Anti-Blocking Multicarrier CDMA System in MISO Channel
Tadashi Fujino
143-147, Aug. 2004, Peer-reviwed
International conference proceedings, English - An MMSE multiuser detector for space-time block coded OFDM
X.N.Tran; Tadashi Fujino; Y.Karasawa
109-113, Aug. 2004, Peer-reviwed
International conference proceedings, English - Performance of space-time block coded CDMA systems with adaptive beamforming
X.N.Tran; A.Rajapakshe; Tadashi Fujino; Y.Karasawa
Proc.ISAP, 1, 285-288, Aug. 2004, Peer-reviwed
International conference proceedings, English - Multiple-symbol defferential detection for OFDM over both time and frequency-selective Rayleigh fading channels
Akira Ishii; Hideki Ochiai; Tadashi Fujino
Proc. Int. Symposium on wireless personal multimedia communications, WPMC2003, Oct. 2003, Peer-reviwed
International conference proceedings, English - A study of two-dimensional differential detection in an OFDM systems
A. Perez; H. Ochiai; Tadashi Fujino
9.17-9.20, Mar. 2002, Peer-reviwed
International conference proceedings, English - High bit rate trellis coded modem - Its R&D and hardware implementation
Tadashi Fujino
IEICE tech. report, IT2001-28, 28, 19-24, Jul. 2001
Scientific journal, Japanese - Comparison on maximum-likelihood sequence estimation schemes incorporated carrier phase estimation
H.Kubo; K.Murakami; Tadashi Fujino
IEEE Tran. Commun., 47, 1, 14-17, Jan. 1999, Peer-reviwed
Scientific journal, English - A multiple open-loop frequency estimation based on differential detection for MPSK
H.Kubo; K.Murakami; M.Miyake; Tadashi Fujino
IEICE, E82-B, 1, 136-144, Jan. 1999, Peer-reviwed
Scientific journal, English - Carrier slip compensating time diversity scheme for hilicopter satellite communication systems
T.Uchiki; T.Kojima; M.Miyake; Tadashi Fujino
IEICE, E81-B, 12, 2311-2317, Dec. 1998, Peer-reviwed
Scientific journal, English - Metric weiting diversity combining based on multiple differential phase detection and its performance in mobile communications environments
T.Kojima; M.Miyake; Tadashi Fujino
IEICE, J81-B-II, 9, 846-854, Sep. 1998, Peer-reviwed
Scientific journal, Japanese - A receiver with iterative soft decision and forwsrd error correction
Tadashi Fujino; e
IEICE, J81-B-II, 8, 742-749, Aug. 1998, Peer-reviwed
Scientific journal, Japanese - Timing recovery scheme using received signal phase information for QPSK modulation
A.Fujimura; M.Miyake; Tadashi Fujino
IEICE, J81-B-II, 6, 665-668, Jun. 1998, Peer-reviwed
Scientific journal, Japanese - Metric Weighted Diversity Combining Based on Multiple Differential Phase Detection and its Performance in Mobile Communication Environment
Tadashi Fujino
IEICE, The Institute of Electronics, Information and Communication Engineers, J81-B-(]G0002[), 9, 846-854, 1998, Peer-reviwed, 差動PSK信号をダイバーシチ受信する場合, 原理上は同期検波後最大比合成方式によりビット誤り率特性の理論下界を達成可能であるが, フェージング下で完全な搬送波再生を行うことは困難である.本論文では, 理論下界へのアプローチとして, さきに提案した多重位相遅延検波の信号処理をダイバーシチ受信に導入し, その有効性につき検討する.フェージングにより伝送路特性が変動する場合, 受信信号がコヒーレントである(すなわち, フェージングの時間相関が高い)とみなせる時間内に多シンボル遅延検波を完了する必要がある.従って, 多重位相遅延検波の信号処理は, 変動の緩慢なフェージング下で特に有効となり, 高速変動するフェージング下では有効性は低下するものと予想される.この観点に基づき, さまざまな速さのレイリーフェージング下でのビット誤り率特性を, 計算機シミュレーションにより検証した.その結果, (1)緩慢なフェージング下では理論下界に0.5dB差にまで迫る特性を示す, (2)高速変動するフェージング下でも場合により従来の遅延検波後最大比合成方式よりも良好な特性を示す, 等のことが判明し, ダイバーシチ受信に多重位相遅延検波の信号処理を導入することの有効性が確認された.
Scientific journal, English - Performance of diversity combining scheme uning simplified wieghting factor
H.Sano; M.Miyake; Tadashi Fujino
IEICE, E80-B, 8, 1160-1166, Aug. 1997, Peer-reviwed
Scientific journal, English - An adaptive soft-output Viterbi equalizer for fast time-variying frequency selective fading
T.Nagayasu; H.Kubo; K.Murakami; Tadashi Fujino
IEICE, J80-B-II, 5, 379-386, May 1997, Peer-reviwed
Scientific journal, Japanese - A soft-output Viterbi equalizer employing expanded memory length in a trellis
T.Nagayasu; H.Kubo; Tadashi Fujino
IEICE, E80-B, 2, 381-385, Feb. 1997, Peer-reviwed
Scientific journal, English - Performance of DS/GMSK/PSK modulation with four-phase correlator and its application to demodulator LSI
Y.Yano; H.Tachika; Tadashi Fujino
IEICE, E79-A, 12, 2062-2070, Dec. 1996, Peer-reviwed
Scientific journal, English - Radio access technology
Tadashi Fujino; H.Tachika
Proceeding of IEICE, The Institute of Electronics, Information and Communication Engineers, 78, 2, 127-132, Feb. 1995, Peer-reviwed, アナログ方式の移動通信では,無線アクセス方式として,主にFDMA方式が採用されてきた.1990年代に入り,日,米,欧の公衆移動通信はディジタル化され,周波数利用効率が高く,ディジタル方式と整合性の良いTDMA方式が主流となった.一方,CDMA方式はTDMA方式より更に周波数利用効率が高く,システムの拡張性が柔軟で経済的な系が構築できる可能性があるという点で期待されている.本稿では,TDMA方式とCDMA方式の概要を述べ,これらを比較すると共に,今後の課題について触れる.
Scientific journal, Japanese - ADAPTIVE MAXIMUM-LIKELIHOOD SEQUENCE ESTIMATION BY MEANS OF COMBINED EQUALIZATION AND DECODING IN FADING ENVIRONMENTS
H KUBO; K MURAKAMI; T FUJINO
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 13, 1, 102-109, Jan. 1995, Peer-reviwed, This paper proposes an adaptive maximum-likelihood sequence estimation (MLSE) by means of combined equalization and decoding, i.e., adaptive combined MLSE, which employs separate channel estimation for respective states in the Viterbi algorithm. First, an approximate metric including channel estimation is derived analytically for this proposed adaptive combined MLSE. Secondly, procedures to accomplish blind equalization are investigated for the proposed MLSE. Finally, its excellent BER performance on fast time-varying fading channels is confirmed by computer simulation, when the proposed MLSE operates as a blind equalizer.
Scientific journal, English - Design of an anti-Rician-fading modem for mobile satellite communication systems
T.Kojima; F.Ishizu; M.Miyake; K.Murakami; Tadashi Fujino
International mobile satellite conference 1995(IMSC), 13-18, Jan. 1995, Peer-reviwed
International conference proceedings, English - A performance of an adaptive Viterbi decoder employing respevitve-state channel estimation
H.Kubo; M.Murakami; Tadashi Fujino
IEICE, J77-A, 12, 1650-1660, Dec. 1994, Peer-reviwed
Scientific journal, Japanese - Adaptive equalization scheme in dual diversity reception for digital mobile communication systems
K.Ueda; K.Murakami; Tadashi Fujino
IEEE PIMRC 94, 655-659, Sep. 1994, Peer-reviwed
International conference proceedings, English - AN ADAPTIVE MAXIMUM-LIKELIHOOD SEQUENCE-ESTIMATOR FOR FAST TIME-VARYING INTERSYMBOL INTERFERENCE CHANNELS
H KUBO; K MURAKAMI; T FUJINO
IEEE TRANSACTIONS ON COMMUNICATIONS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 42, 2-4, 1872-1880, Feb. 1994, Peer-reviwed, This paper proposes an adaptive maximum-likelihood sequence estimator (MLSE), which is a suboptimum approximation to the adaptive maximum-likelihood detector and is capable of tracking fast time-varying intersymbol interference (ISI) channels. The adaptive MLSE consists of a channel estimator and an MLSE implemented by the Viterbi algorithm (VA). The novel feature of the proposed adaptive MLSE is a channel estimation scheme, where the channel estimation is accomplished for each state in the VA along the surviving path connected to each state. This MLSE makes it possible to estimate a channel impulse response without an influence of a decision delay inherent in the VA, and the performance and complexity of the proposed procedure is controlled by the memory length of the VA. The bit error rate performance of the proposed MLSE is confirmed by experimental results. It is shown that the proposed MLSE has a capability of excellent tracking performance in a severe environment caused by fast time-varying ISI, for example frequency selective multipath fading in digital mobile radio communications.
Scientific journal, English - A Performance of an Adaptive Viterbi Decoder Employing Respective-State Channel Estimation
Tadashi Fujino
IEICE, J77-A, 12, 1650-1660, 1994
Scientific journal, English - Diferential detection scheme for DPSK using pahse sequence estimation
T.Kojima; M.Miyake; Tadashi Fujino
IEICE, B-II, 10, 783-792, Oct. 1993, Peer-reviwed
Scientific journal, Japanese - A DS/SS RAKE receiver weighted avaraging technique with a forgetting factor
T.Asahara; T.Kojima; M.Miyake; Tadashi Fujino
IEICE, J76-B-II, 9, 777-780, Sep. 1993, Peer-reviwed
Scientific journal, Japanese - 4 bits soft decision512 stage x 2 channel correlator LSI
S.Inoue; H.Sakurai; H.Takagi; E.Watanabe; M.Hamamura; N.Kataoka; M.miyake; T.Imai; Tadashi Fujino
IEEE 4th international indoor and mobile radio communications (PIMRC 93), 402-406, Sep. 1993, Peer-reviwed
International conference proceedings, English - Channel assigning method capable of reducing channel mismatcheing for multicarier TDMA systems
N.Kataoka; Y.Moriai; M.Miyake; Tadashi Fujino; O.Yamanaka
IEICE, J76-B-I, 2, 191-194, Feb. 1993, Peer-reviwed
Scientific journal, Japanese - A study on concatedated coding scheme with variable coding gain
T.Kojima; H.Yoshida; A.Fujimura; M.Miyake; A.Yamagishi; Tadashi Fujino
IEICE, J75-A, 8, 1240-1249, Aug. 1992, Peer-reviwed
Scientific journal, Japanese - A design of an anti-multiath fading modem for mobile satellite and mand mobile communication systems
F.Ishizu; K.Ueda; K.Murakami; Tadashi Fujino
14th AIAA international communication satellite systems conference, 1811-1818, Mar. 1992, Peer-reviwed
International conference proceedings, English - A design of an adaptive decision feedback equalizer for digital mobile communications
K.Murakami; K.Ueda; M.Takano; Tadashi Fujino
IEEE PIMRC 1991, 1-5, Sep. 1991, Peer-reviwed
International conference proceedings, English - Performance of soft decision digital matched filter in direct-sequence spread-spectrum communication systems
N.Kataoka; T.Kojima; M.Miyake; Tadashi Fujino
IEICE, E74, 5, 1115-1122, May 1991, Peer-reviwed
Scientific journal, English - A theoretical approach to digital demodulation in direct-sequence spread-spectrum communication systems
T.Kojima; N.Kataoka; M.Miyake; Tadashi Fujino
Proc. 1991 global satellite communications symposium, 383-389, May 1991, Peer-reviwed
International conference proceedings, English - Design ofan adaptive Kalman equalizer and its performance over frequency selective fading channels
K.Murakami; K.Ueda; M.Takano; Tadashi Fujino
IEICE, J73-B-II, 11, 708-717, Nov. 1990, Peer-reviwed
Scientific journal, Japanese - A study on acquisition of direct-sequence spread-spectrum signals using soft decision digital matched filtering
N.Kataoka; T.Kojima; M.Miyake; Tadashi Fujino
IEEE Singapore ICCS 90, 1064-1068, Nov. 1990, Peer-reviwed
International conference proceedings, English - A proposal of new detector scheme using delta modulation type digital matched filter for direct-sequence spread-spectrum comunication system
H.Tachika; Tadashi Fujino
ISITA 90, 907-910, Nov. 1990, Peer-reviwed
International conference proceedings, English - Performance of a square-root Kalman equalizer for digital mobile communication systems
K.Ueda; K.Murakami; M.Takano; Tadashi Fujino
ISITA 90, 631-634, Nov. 1990, Peer-reviwed
International conference proceedings, English - A study on return-to-zero direct sequence spread spectrum communications for anti-mutipath techniques
H.Murai; H.Tachika; Tadashi Fujino
ISITA 90, 875-878, Nov. 1990, Peer-reviwed
International conference proceedings, English - An adaptive maximum-likelihood sequence estimator for fast time-varying fading channels
H.Kubo; K.Murakami; M.Miyake; Tadashi Fujino
ISITA 90, 16, 247-250, Nov. 1990, Peer-reviwed
International conference proceedings, English - Design and performance of direct-sequence spread-spectrum modem using soft decision degital matched filter
M.Miyake; T.Kojima; N.Kataoka; Tadashi Fujino
IEEE Symposium on spread spectrum techniques and applications, 135-139, Sep. 1990, Peer-reviwed
International conference proceedings, English - DESIGN OF AN ADAPTIVE KALMAN EQUALIZER AND ITS PERFORMANCE OVER FADING MULTIPATH CHANNELS
K MURAKAMI; K UEDA; M TAKANO; T FUJINO
40TH IEEE VEHICULAR TECHNOLOGY CONFERENCE, I E E E, 564-570, 1990, Peer-reviwed
International conference proceedings, English - DEVELOPMENT OF AN FEC COMBINED MODEM FOR DS-SSMA COMMUNICATION-SYSTEM
S INOUE; T ISHIZU; E WATANABE; N KATAOKA; M MIYAKE; A INOUE; H ITO; T FUJINO
GLOBECOM 90 - IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE & EXHIBITION, VOLS 1-3, I E E E, 746-750, 1990, Peer-reviwed
International conference proceedings, English - Development of a concatenated Reed-Solomon/Viterbi FEC combined modem and its field test via 14/11 GHx satellite
Tadashi Fujino(first author) et; al
Proc. Globecom, 1080-1087, Nov. 1989, Peer-reviwed
International conference proceedings, English - Multiaccess protocol design of slotted-ALOHA with reservation upon retransmission
Y.Moritani; A. Shibuya; Tadashi Fujino
IEEE Singapore ICCS'88, 168-172, Nov. 1988, Peer-reviwed
International conference proceedings, English - Performance of Viterbi decoders using compressed path metrics
M.Miyake; Tadashi Fujino; K.Fujiwara; M.Kasahara
IEICE, J71-B, 4, 555-562, Apr. 1988, Peer-reviwed
Scientific journal, Japanese - FEC combined burst-modem for business satellite communications use
K.Murakami; M.Miyake; T.Fuji; Y.Moritani; Tadashi Fujino; K.Ito; F.Takahata
Globecom'1987, 274-280, Nov. 1987, Peer-reviwed
International conference proceedings, English - Compression of path metrics in Viterbi decoders
M.Miyake; Tadashi Fujino; K.Fujiwara
IEEE Globecom 1987, 1692-1696, Nov. 1987, Peer-reviwed
International conference proceedings, English - A 120 Mb/s coded 8PSK modem using Ungerboeck codes
Tadashi Fujino
IEEE IT, oral presentation, oral presentation, oral presentation, Jun. 1987, Peer-reviwed
Scientific journal, English - Performance of a Viterbi decoder using simplified digital metric calculation
M.Miyake; Tadashi Fujino; K.Fujiwara
IEICE, J70-B, 6, 673-681, Jun. 1987, Peer-reviwed
Scientific journal, Japanese - Simplified Viterbi decoder for 8PSK system using Ungerboeck codes
M.Miyake; Tadashi Fujino; K.Fujiwara
IEICE, J69-B, 10, 1153-1155, Oct. 1986, Peer-reviwed
Scientific journal, Japanese - A 120 Mbit/s coded 8PSK modem with soft-decision Viterbi decoder
Tadashi Fujino(first author; et
Proc. ICC, 1774-1780, Jun. 1986, Peer-reviwed
International conference proceedings, English - Multi-dimensional soft-decision unique word detection
Tadashi Fujino; K.Fujiwara
Proc. ICC, 1781-1786, Jun. 1986, Peer-reviwed
International conference proceedings, English - A 120Mbps 8PSK modem with soft-decision Viterbi decoder
Tadashi Fujino(first author; et
Proc.7th international conference on digital satellite communications, 315-321, May 1986, Peer-reviwed
International conference proceedings, English - A Theoretical Approach to Multi-Dimensional Soft-Decision Unique Word Detection
Tadashi Fujino
IEICE, J69-B, 11, 1516-1522, 1986, Peer-reviwed
Scientific journal, English - Performance of a coded 8PSK modem with a Vitervi decoder using simplified metric calculation
M.Miyake; Tadashi Fujino; Y.Umeda; E.Yamazaki; K.Fujiwara
IEICE, J68-B, 10, 1128-1136, Oct. 1985, Peer-reviwed
Scientific journal, Japanese - A study of a coded 8PSK niden wutg a Viterbi decoder using simplified metric calculation
M.Miyake; Tadashi Fujino; Y.Umeda; E.Yamazaki
PTC'85, 279-285, Jan. 1985, Peer-reviwed
International conference proceedings, English - Coded Octal PSK System Performance Disturbed by Imperfect Recovered Phase Reference
Tadashi Fujino; Y.Umeda; E.Yamazaki
IEICE, J67-B, 10, 1095-1102, 1984, Peer-reviwed
Scientific journal, English - Transient Probability response of Cycle Slip Occurrence in the PSK-TDMA carrier recovery
Tadashi Fujino; Y.Umeda; E.Yamazaki
IEE, 131Pt.F, 7, 729-733, 1984, Peer-reviwed
Scientific journal, English - Effects of Jitter and Cycle Slipping of Phase Reference upon Unique Word Detection in QPSK Systems
Tadashi Fujino; Y.Moritani; Y.Umeda
IEEE, SAC-1, 1, 95-102, 1983, Peer-reviwed
Scientific journal, English - Effects of jitter and cycle slipping of phase reference upon unique word missed detection in QPSK systems
Tadashi Fujino; Y.Umeda
AIAA 9th communications satellite sytems conference, 92-99, May 1982, Peer-reviwed
International conference proceedings, English - Cycle sllipping occurrence probability
Tadashi Fujino; Y.Umeda
IEICE, J64-B, 6, 554-556, Jun. 1981, Peer-reviwed
Scientific journal, Japanese - Simple methods to construct one-coinsidence codes
M.Miyake; Tadashi Fujino; Y.Umeda
IEICE, J64-B, 6, 558-559, Jun. 1981, Peer-reviwed
Scientific journal, Japanese - A pulse shaping filter design
K.Murakami; Tadashi Fujino
IEICE, J64-B, 4, 334-335, Apr. 1981, Peer-reviwed
Scientific journal, Japanese - On the QPSK Modem System for TDMA Satellite Communications
Tadashi Fujino; Y.Umeda
IEICE, 63-B, 8, 775-782, 1980, Peer-reviwed
Scientific journal, English - PCM-PSK-TDMA Demodulator for Low Receive CN Ratio Operation
Tadashi Fujino
IEICE, 62B, 4, 438-439, 1979
Scientific journal, English - Wave-from response of 4-phase modulator at 20GHz
Tadashi Fujino; A.Okano
IEICE, 57-B, 4, 265-267, Apr. 1974, Peer-reviwed
Scientific journal, Japanese
Books and other publications
- 新版ディジタル移動体通信のための波形等化技術
藤野 忠
Japanese, Joint work, 第3章 信号伝送技術, オーム社, Nov. 2000 - Digital mobile communications
Tadashi Fujino
Japanese, Editor, Shoko-do, Jun. 2000 - Tadashi Fujino
ディジタル移動体通信のため; 波形等化技術
Japanese, Joint work, 第5章 等化器の具体的な設計, トリケプス, Jun. 1994 - 移動通信ハンドブック
藤野 忠
Japanese, Joint work, 第3章 信号伝送技術, オーム社, 1994
Lectures, oral presentations, etc.
- Lattice-reductionに准最尤演算を用いた信号推定法
中島義隆; 渡邊貴仁; 下川哲佳; 藤野忠
Oral presentation, Japanese, 電子情報通信学会総合大会
Mar. 2010 - Gram-Schmidtの直行化を利用したlattice-reductionによる信号推定
橋詰昴輝; 佐々木優輔; 藤野忠
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会総合大会
Mar. 2010 - Lattice-reductionに準最尤演算を用いた信号推定法
中島義隆; 渡邊貴仁; 下川哲佳; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会 総合大会
Mar. 2010 - Gram-Schmidtの直交化を利用したlattice-reductionによる信号推定法
橋詰昴輝; 佐々木優輔; 藤野 忠
Oral presentation, Japanese, 電子通信学会,電子通信学会 総合大会
Mar. 2010 - 付加情報を不要としたＳＬＭ法の一検討
小島 年春; 志田裕紀; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会 総合大会
Mar. 2010 - A lattice-reduction aided detection by combining LLL algorithm and Gram-Schmidt procedure
Tadashi Fujino; Shinjiro Wakazono; Yusuke Sasaki; Xuan Nam Tran
Invited oral presentation, English, The 2009 IEEE REV international conference on advanced technologies for communications (ATC2009), IEEE REV, Hai Phong, Vietnam, International conference
Nov. 2009 - a lattice-reduction aided detection by combining LLL-algorithm and Gram-Schmidt procedure
Tadashi Fujino
Invited oral presentation, English, International conference on advanced technologies for communications(ATC), IEEE REV, Hanoi,Vietnam, International conference
Oct. 2009 - スローフェージングMIMO通信路におけるlattice reductionのスワッピング回数低減方式
大森元気; 下川哲佳; 藤野忠
Oral presentation, Japanese, 電子情報通信学会,電子情報通信学会2009年ソサエティ大会
Sep. 2009 - スローフェージングMIMOにおけるラティスリダクションの改善法
石田智朗; 藤野忠
Oral presentation, Japanese, 電子情報通信学会
Sep. 2009 - Lattice Reductionを用いたMIMOシステムにおけるビット誤り率の改善
渡邊貴仁; 安場仁志; 藤野 忠
Oral presentation, Japanese, 電子情報学会2008総合大会,電子情報学会2008総合大会
Mar. 2008 - Lattice Reductionを用いた無線通信の信号検出における計算量の改善
安場仁志; 渡邊貴仁; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会2008総合大会,電子情報通信学会2008総合大会
Mar. 2008 - MIMOにおけるlattice reductionを用いた移動体通信の送信機毎のビット誤り率の検討
下川哲佳; 佐々木優輔; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会2008総合大会,電子情報通信学会2008総合大会
Mar. 2008 - Multi-carreir CDMA system for combating channel blocking in frequency-selective fading MIMO-STBC channel
Tadashi Fujino; Junya Nakamura; Xuan Nam Tran; Toshiharu Kojima
Keynote oral presentation, English, Proc. 10th biennual Vietnam Cnf. on Radio and Electronics (REV2006), REV, Hanoi, Vietnam, International conference
Nov. 2006 - Layered error characteristics of lattice-reduction aided V-BLAST detectors
Tien Duc Nguyen; Xuan Nam Tran; Tadashi Fujino
Oral presentation, English, 電子情報通信学会2006総合大会,電子情報通信学会2007総合大会
Mar. 2006 - Groupwise MMSE and ML MUD for STBC-OFDM
Xuan Nam Tran; Tadashi Fujino
Oral presentation, English, 2005電子情報通信学会基礎境界ソサイエティ大会,2005電子情報通信学会基礎境界ソサイエティ大会
Sep. 2005 - An combination MMSE multiuser detection scheme for STBC-OFDM
A.T.Le; X.N.Tran; Tadashi Fujino
Oral presentation, English, IEICE
May 2005 - Combined MMSE and ML MUN for STBC-OFDM
L.A.Tuan; X.N.Tran; Tadashi Fujino
Oral presentation, Japanese
Mar. 2005 - A proposal of multicarrier CDMA system in MIMO channel for combating channel blocking
Tadashi Fujino; J.Nakamura; L.Karunarathna; E.M.Elmostafa
Oral presentation, Japanese, IEICE
Mar. 2005 - チャネルブロッキングに強いMC-CDMA方式の一提案
藤野 忠; 中村淳也; Lahiru Karunarathana; LeMenzhi M. ElMostafa
Oral presentation, Japanese, 電子情報通信学会信学技報,電子情報通信学会信学技報
Mar. 2005 - Combined MMSE-ML multiuser detection for STBC-OFDM
Anh Tuan Le; Tran Xuan Nam; Tadashi Fujino
Oral presentation, English, 電子情報通信学会2005総合大会,電子情報通信学会2005総合大会
Mar. 2005 - チャネルブロッキングに強いMC-CMDA方式の一提案
藤野 忠; 中村淳也; ラヒル・カルナラトナ; エルメンジ・エルモスタファ
Oral presentation, Japanese, 電子常用通信学会信学技報,電子常用通信学会信学技報
Mar. 2005 - Combined MMSE and ML MUD for STBC-OFDM
Tuan Anh Le; Xuan Nam Tran; Tadashi Fujino
Oral presentation, English, 2005電子情報通信学会総合大会,2005電子情報通信学会総合大会
Mar. 2005 - STBC-OFDMにおけるMMSE-MLマルチユーザ検出方式
レ・アン・トワン; チャン・スワン・ナム; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会 信学技報
Mar. 2005 - チャネルブロッキングに強いMC-CDMAの方式の一提案
藤野 忠; 中村淳也; ラヒル・カラナータ; エルメンジ・モスタファ
Oral presentation, Japanese, 電子情報通信学会,RCS
Mar. 2005 - An MMSE detectior for multiuser space-tiem blick coded system
Xuan Nam Tran; Tadashi Fujino; Y.Karasawa
Oral presentation, English, IEICE Technical Report
Jul. 2004 - An MMSE muliuser detector for multiuser space-time block coded OFDM
T.X.Nam; Tadashi Fujino; Y.Karasawa
Oral presentation, Japanese, IEICE
Jun. 2004 - An MMSE detector for multiuser space-time block code OFDM
Xuan Nam Tran; Tadashi Fujino; Yoshio Karasawa
Oral presentation, English, IEICE
Jun. 2004 - Performance of space-time code in a MIMO DS-CDMA system
Xuan Nam Tran; Tadashi Fujino; Y.Karasawa
Oral presentation, English, IEICE General Conference
Mar. 2004 - Theoretical analysis of bit error rate performance for trellis coded M-PSK modulation with reference carrier phase offset
H.Otazawa; Tadashi Fujino
Oral presentation, Japanese, IEICE
Jun. 2003 - 基準再生搬送波に位相誤差が存在するときのトレリス符号化M-PSK変調のビット誤り率特性の理論解析
織田澤博樹; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会信学技報,電子情報通信学会信学技報
Jun. 2003 - 純静的なレイリーフェーディング下におけるBICM符号化DAPSKのk通信路容量に対する理論解析
石橋巧至; 落合秀樹; 藤野 忠
Oral presentation, Japanese, The 25th symposium on Information Theory and Its Applications,The 25th symposium on Information Theory and Its Applications
Dec. 2002 - ビットインターリーブを伴った符号化DAPSKの通信路容量に関する研究
石橋巧至; 落合秀樹; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会信学技報,電子情報通信学会信学技報
Jul. 2002 - OFDMに対する適応的な遅延検波方式の検討
石井暁; 落合秀樹; 藤野 忠
Oral presentation, Japanese, 電子情報通信学会信学技報,電子情報通信学会信学技報
Jul. 2002 - 高速ビットレートのTCM符号化変調モデムの研究開発から実用化まで
藤野 忠
Invited oral presentation, Japanese, 電子通信学会信学技報IT2001-7, 電子通信学会
Jul. 2001 - Reserch and Development of 120Mbps trellis coded 8PSK modem using Ungerboeck code.
Tadashi Fujino
Others, English, Invited presentation for gradate students(invited by Professors S.Benedetto and E.Biglieri), Politechnic University of Torino(Politecnico di Torino)
May 1986 - A 120Mbps 8PSK modem with soft decision Viterbi decoder
Tadashi Fujino(first author; et
Oral presentation, Japanese, IEICE
Mar. 1985 - A 120 Mbps 8PSK modem with soft decision Viterbi decoder
Tadashi Fujino; Y.Moritani; M.Miyake; K.Murakami; Y.Sakato; H.Shiino
Oral presentation, Japanese, IEICE
Mar. 1985 - Effects of nose of recovered phse refeence upon unique word miss detection in QPSK systems
Tadashi Fujino; Y.Umeda
Oral presentation, Japanese, IEICE
Apr. 1981 - Quadrupling of burst PSK signal plus stationary Gaussian noise
Tadashi Fujino; Y.Umeda
Oral presentation, Japanese, IEICE
Nov. 1980 - A study of PSK modulator
Tadashi Fujino; A.Okano; V.K.Misra
Oral presentation, Japanese, IEICE
Apr. 1973