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

Author

Sadek, Mirette ; Tarighat, Alireza ; Sayed, Ali H.

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA

Volume

6

Issue

5

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

1711

Lastpage

1721

Abstract

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

Keywords

MIMO communication; channel coding; channel estimation; cochannel interference; interference suppression; matrix algebra; precoding; radio links; wireless channels; Alamouti coding; SLNR; channel estimation errors; cochannel interference suppression; downlink multi-user MIMO channels; leakage-based precoding scheme; multiuser MIMO downlink communications; signal-to-leakage-and-noise ratio; zero-forcing solutions; Array signal processing; Channel estimation; Downlink; Interchannel interference; Iterative decoding; MIMO; Radiofrequency interference; Receiving antennas; Signal design; Signal to noise ratio;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2007.360373

Filename

4202177