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Multi-user frequency-domain channel identification, interference suppression, and equalization for time-varying broadband wireless communications

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2 Author(s)
Thomas, T.A. ; Commun. Syst. Res. Lab., Motorola Labs., Schaumburg, IL, USA ; Vook, F.W.

In a mobile broadband wireless communication system, an adaptive antenna array can be used to equalize and demodulate multiple users' signals while suppressing interference. In a broadband mobile system operating at 2 GHz or higher, there is a strong potential for severe levels of time and frequency selectivity, which must be accurately tracked for proper multi-user demodulation and interference suppression. We present new frequency-domain techniques that allow for multi-user demodulation even in the presence of high levels of frequency selectivity, and severe time variations across a data block (where a data block is defined to be a group of samples that are FFTd into the frequency domain). These techniques include a time-varying multi-user channel estimation process and a frequency-domain adaptive antenna combining algorithm. The efficacy of the channel estimator and adaptive antenna combining algorithm is demonstrated through simulation results

Published in:

Sensor Array and Multichannel Signal Processing Workshop. 2000. Proceedings of the 2000 IEEE

Date of Conference:

2000

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