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IEICE Transactions on Communications 2005 E88-B(1):58-65; doi:10.1093/ietcom/E88-B.1.58
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Copyright © 2005 The Institute of Electronics, Information and Communication Engineers

Implementation and Performance Evaluation of Simple SDM-COFDM Prototype Using Propagation Coefficient Matrix Tracking for Fast Fading MIMO Channels

Takatoshi SUGIYAMA1, Satoshi KUROSAKI1, Daisei UCHIDA2, Yusuke ASAI3 and Masahiro UMEHIRA2

1 The author is with Wireless Labortories, NTT DoCoMo Inc., Yokosuka-shi, 239-8536 Japan. E-mail: sugiyamata{at}nttdocomo.co.jp, 2 The authors are with NTT Network Innovation Laboratories, NTT Corporation, Yokosuka-shi, 239-0847 Japan., 3 The author is with NTT Access Network Service Systems Laboratories, NTT Corporation, Yokosuka-shi, 239-0847 Japan.

This paper describes implementation and performance evaluation of simple SDM-COFDM (Space Division Multiplexed-Coded Orthogonal Frequency Division Multiplexing) prototype over fading MIMO (Multi-Input Multi-Output) channel in order to achieve higher frequency utilization efficiency. It employs ZF (Zero Forcing) type detection scheme for SDM transmission to reduce hardware implementation complexity, where ZF type detection scheme needs to only multiply the received data by the estimated inverse propagation coefficient matrix at each OFDM subcarrier. Moreover, in order to improve the performance degradation due to the increase of the transmitted data length per frame in fast fading environments, the inverse matrix tracking using STC (Space-Time Coded) pilot is proposed and implemented in the prototype. Experimental results show that the prototype with 2 x 2 antennas achieves about 90% increase of the frequency utilization efficiency compared to the SISO (Single-Input Single-Output) transmission.

Key Words: SDM, OFDM, MIMO, ZF, frequency utilization efficiency

Manuscript received May 28, 2004. Manuscript revised July 29, 2004.


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