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Modified Block Diagonalization Precoding with Greedy Approach  

Kim, Sung-Tae (연세대학교 전기전자공학과 정보통신 연구실)
Seo, Woo-Hyun (연세대학교 전자공학과)
Kwak, Kyung-Chul (연세대학교 전기전자 공학과)
Hong, Dae-Sik (연세대학교 전기전자공학과 정보통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.1C, 2008 , pp. 79-85 More about this Journal
Abstract
Dirty Paper Coding(DPC) can achieve the sum capacity of a multiuser multiple-input multiple-output(MU MIMO) broadcast channels. However, due to the high computational complexity of the successive encoding and decoding, deploying DPC in real systems is impractical. As one of practical alternatives to DPC, Block Diagonalization(BD) was researched. BD is an extension of the zero-forcing preceding technique that eliminates interuser interference(IUI) in downlink MIMO systems. Though BD has lower complexity than DPC, BD shows poor sum capacity performance. We show that sum capacity performance of BD is degraded due to no IUI constraint. Then, we modify BD to improve its sum capacity performance with relaxing the constraint and sub optimal channel set searching. With simulation results, it can be verified that our modification in BD induces some improvement in sum capacity performance.
Keywords
Multiuser MIMO; Bloch Diagonalization; MIMO precoding;
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