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Complexity Reduction Scheme for Lattice Reduction-based MIMO Receiver under Time Varying Fading Environments  

Kim, Han-Nah (영남대학교 정보통신공학과 광대역무선통신 연구실)
Choi, Kwon-Hue (영남대학교 정보통신공학과 광대역무선통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.11A, 2009 , pp. 852-861 More about this Journal
Abstract
We propose a complexity reduced Lattice Reduction(LR) scheme for MIMO detection under time varying fading environments. It is found that for successive MIMO transmission instances, the integer matrix P after LR decomposition remains the same or only a few elements of the matrix P are slightly changed. Based on this feature, we perform LR reduction by setting the initial values for P matrix for the decomposition to be the one obtained in the previous instance not starting from the identity matrix. Simulation results reveal that the proposed scheme drastically reduces overall complexity of LR reduction compared to the conventional scheme for various system parameters under time varying channels. We also show that the proposed scheme can be applied to Seysen LR as well as LLL(Lenstra, Lenstra, and Lavasaz)-LR.
Keywords
MIMO; Time Varying Fading Channel; Seysen LR; Lattice Reduction-Aided Detection; Complex LLL-LR;
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