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A Leakage-Based Precoding Scheme for Downlink Multi-User MIMO Channels

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3 Author(s)
Sadek, M. ; Dept. of Electr. Eng., California Univ., Los Angeles, CA ; Tarighat, A. ; Sayed, A.H.

In multiuser MIMO downlink communications, it is necessary to design precoding schemes that are able to suppress co-channel interference. This paper proposes designing precoders by maximizing the so-called signal-to-leakage-and-noise ratio (SLNR) for all users simultaneously. The presentation considers communications with both single- and multi-stream cases, as well as MIMO systems that employ Alamouti coding. The effect of channel estimation errors on system performance is also studied. Compared with zero-forcing solutions, the proposed method does not impose a condition on the relation between the number of transmit and receive antennas, and it also avoids noise enhancement. Simulations illustrate the performance of the scheme

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Wireless Communications, IEEE Transactions on  (Volume:6 ,  Issue: 5 )