Share Email Print
cover

Proceedings Paper

Iterative multi-user detection in spatially multiplexed up-link OFDM channels
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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)

© SPIE. Terms of Use
Back to Top