A geometric approach to blind source separation for digital wireless applications

Abstract The problem of blindly estimating multiple digital cochannel communication signals using an antenna array is studied in the presence of multipath fading. We develop a fast sequential-estimation algorithm for separating multi-user signals based on the geometric observation made by Hansen and Xu (1996). When the signals are constrained to a finite alphabet, it is possible to visualize the geometric properties of the problem, which can be exploited to sequentially extract the digital cochannel communication signals. We will present simulation results comparing speed and BER performance with different methods.

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