Reduced dimension equalizer and interference canceller for MIMO-OFDM

Chad C. Lau; Michael D. Zoltowski

doi:10.1117/12.778688

3 April 2008 Reduced dimension equalizer and interference canceller for MIMO-OFDM

Chad C. Lau, Michael D. Zoltowski

Proceedings Volume 6980, Wireless Sensing and Processing III; 698003 (2008) https://doi.org/10.1117/12.778688
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

In this paper, an interference cancellation and equalization method is proposed for a multiple-input, multipleoutput orthogonal frequency division multiplexing (MIMO-OFDM) system. Standard equalization techniques such as zero-forcing (ZF) and adaptive array processing techniques such as per-tone or time-domain equalization may require large amounts of training and memory for storage of the weight coefficients. In a MIMO-OFDM system with N carriers, equalizers at each antenna are characterized by the solution space associated with an underdetermined system of linear equations. A structured per-tone technique is proposed that utilizes the extra degrees of freedom in order to cancel interfering signals; the resultant equalizers (weight vectors) have lengths significantly smaller than N, but at least as long as the channel impulse response.

Citation Download Citation

Chad C. Lau and Michael D. Zoltowski "Reduced dimension equalizer and interference canceller for MIMO-OFDM", Proc. SPIE 6980, Wireless Sensing and Processing III, 698003 (3 April 2008); https://doi.org/10.1117/12.778688

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