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Multiple-Antenna Interference Cancellation and Detection for Two Users Using Precoders
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DOI：10.1109/JSTSP.2009.2035799.png)
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We consider interference cancellation for a system with two users when users know each other channels. The goal is to utilize multiple antennas 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 two receive antennas can completely cancel the interference of two users and provide a diversity of 2 for users with two transmit antennas. We propose a system to achieve the maximum possible diversity of 4 with low complexity. Then, we extend the results to two-user systems with any number of transmit and receive antennas. 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.
Keyword:
Interference cancellation
multi-user detection
multiple antennas
orthogonal designs
precoder
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Multiuser interference cancellation and detection for users with more than two transmit antennas
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