Blind separation of two users based on user delays and optimal pulse-shape design

Authors:
Xin Liu;Athina P. Petropulu;H. Vincent Poor;Visa Koivunen
Affiliations:
Electrical and Computer Engineering Department, Drexel University, PA;Electrical and Computer Engineering Department, Drexel University, PA;School of Engineering and Applied Science, Princeton University, Princeton, NJ;Signal Processing Laboratory, Aalto University, Aalto, Finland
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on interference management in wireless communication systems: theory and applications
Year:
2010

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Abstract

A wireless network is considered, in which two spatially distributed users transmit narrow-band signals simultaneously over the same channel using the same power. User separation is achieved by oversampling the received signal and formulating a virtual multiple-input multiple-output (MIMO) system based on the resulting polyphase components. Because of oversampling, high correlations can occur between the columns of the virtual MIMO system matrix which can be detrimental to user separation. A novel pulse-shape waveform design is proposed that results in low correlation between the columns of the system matrix, while it exploits all available bandwidth as dictated by a spectral mask. It is also shown that the use of successive interference cancelation in combination with blind source separation further improves the separation performance.