Interference cancellation and detection using precoders

Authors:
Feng Li;Hamid Jafarkhani
Affiliations:
Department of Electrical Engineering and Computer Science, University of California, Irvine;Department of Electrical Engineering and Computer Science, University of California, Irvine
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

Citing 4
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Abstract

We consider interference cancellation for a system with two users when users know each other channels. The goal is to utilize channel information to cancel the interference without sacrificing the diversity or the complexity of the system. Before, in the literature, it was shown how a receiver with 2 receive antennas can completely cancel the interference of two users and provide a diversity of 2 for users with 2 transmit antennas. We propose a system to achieve the maximum possible diversity of 4 with low complexity. Our main idea is to design precoders, using the channel information, to make it possible for different users to transmit over orthogonal spaces. Then, using the orthogonality of the transmitted signals, the receiver can separate them and decode the signals independently. We analytically prove that the system provides full diversity to both users. In addition, we provide simulation results that confirm our analytical proof.