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Proceedings Paper

Iterative multi-user detection in spatially multiplexed up-link OFDM channels
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Paper Abstract

This paper proposes an iterative multi-user detection scheme for coded asynchronous orthogonal frequency division multiplexing (OFDM) systems. Although a spatially multiplexed multi-user communication system can achieve high spectral efficiency, multiple access interference deteriorates the quality of signal detection. A linear minimum mean squared error (MMSE) based multi-user receiver for asynchronous OFDM channels has been proposed, and hard interference cancellation schemes were developed for an uncoded system. In this paper, we develop a low-complexity iterative soft interference cancellation technique exploiting the circular convolution property of cyclic prefix based OFDM systems. The proposed algorithm mitigates the residual interference and improves the performance of a channel decoder in a coded system through iterative demodulation and decoding. Simulation results demonstrate that spatial multiplexing of two users with two receiving antennas can outperform a system serving a single user with one receiving antenna by employing the proposed turbo receiver.

Paper Details

Date Published: 2 June 2005
PDF: 8 pages
Proc. SPIE 5819, Digital Wireless Communications VII and Space Communication Technologies, (2 June 2005); doi: 10.1117/12.606385
Show Author Affiliations
Hyejung Jung, Purdue Univ. (United States)
Michael D. Zoltowski, Purdue Univ. (United States)

Published in SPIE Proceedings Vol. 5819:
Digital Wireless Communications VII and Space Communication Technologies
Rabindra Singh; Raghuveer M. Rao; Sohail A. Dianat; Michael D. Zoltowski, Editor(s)

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