2 June 2005 Iterative multi-user detection in spatially multiplexed up-link OFDM channels
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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.
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Hyejung Jung, Michael D. Zoltowski, "Iterative multi-user detection in spatially multiplexed up-link OFDM channels", Proc. SPIE 5819, Digital Wireless Communications VII and Space Communication Technologies, (2 June 2005); doi: 10.1117/12.606385; https://doi.org/10.1117/12.606385
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