The Optimum Channel Estimation for Coherent Receivers in Multicarrier CDMA System with Antenna Array(Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)

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概要

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• It is well known that diversity performance of communication systems using signals with high dimensions in time, frequency and/or spatial domains depends on correlation of the channel characteristics along signal dimensions. On the other hand, it has not been payed due attention how the coherent receiver which combines the signals is greatly affected by the erroneous channel estimation which can undermine the diversity gain. In this paper, assuming that the estimator is given the a priori probability of the channel characteristics, we propose an optimum estimation scheme based on MAP criterion, in an uplink-MC/CDMA system on channels with frequency selective fading, with an array of antennas at the receive. The MAP estimator effectively takes into account the correlation of the channel characteristics that the conventional estimator neglects. We also propose a signal design in pilot symbol periods that enables the receiver to separately obtain the sufficient statistic for estimating the channel characteristics without MAI. Using computer simulation, we obtained MSE error performances of the proposed estimator compared with the conventional estimator and their effect on BER performances of the diversity combining receiver. It was observed that using the conventional estimator for combining greater number of signals than the effective channel dimension deteriorated the BER performance while using the proposed estimator kept the optimum performance just as the error-free estimator did. Also obtained for MC/CDMA systems are BER performances of the single user matched filter and MMSE receivers using the proposed and the conventional estimators. A considerable improvement of the MMSE performance was achieved owing to the optimum estimator. It remains for the a priori probability of the channel characteristics to be properly assumed and dealt with in sequential estimation.

• 社団法人電子情報通信学会の論文
• 2003-01-01

著者

• Itoh Kohji

  Department of Medicinal Biotechnology, Institute of Health Biosciences, The University of Tokushima

• SHIMIZU Rie

  Department of Physics, Faculty of Science, Kagoshima University

• Itoh K

  Tokyo University Of Science

• Fujii M

  Samsung Yokohama Res. Inst. Co. Ltd. Yokohama‐shi Jpn

• Fujii Masahiro

  Department Of Cardiology Nippon Medical School

• Fujii M

  Tokyo University Of Science:(present Office)utsunomiya University

• Fujii M

  Yamanouchi Pharmaceutical Co. Ltd. Ibaraki Jpn

• Itoh K

  Faculty Of Industrial Science And Technology Tokyo University Of Science

• Itoh Kohji

  Department Of Biology Chiba University

• Itami Makoto

  Department of Applied Electronics, Science University of Tokyo

• Itami Makoto

  Faculty Of Industrial Science And Technology Tokyo University Of Science

• Itami Makoto

  Department Of Applied Electronics At Tokyo University Of Science

• Shimizu Rie

  Department Of Applied Electronics Tokyo University Of Science

• Itoh Kohji

  Department Of Applied Electronics Science University Of Tokyo

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