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Computationally Efficient Lattice Reduction Aided Detection for MIMO-OFDM Systems under Correlated Fading Channels

TitleComputationally Efficient Lattice Reduction Aided Detection for MIMO-OFDM Systems under Correlated Fading Channels
Publication TypeJournal Article
Year of Publication2012
AuthorsLiu, W., K. Choi, and H. Liu
JournalETRI Journal
Volume34
Issue4
Pagination503 - 510
Date Published08/2012
ISSN1225-6463
Abstract

We analyze the relationship between channel coherence bandwidth and two complexity-reduced lattice reduction aided detection (LRAD) algorithms for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems in correlated fading channels. In both the adaptive LR algorithm and the fixed interval LR algorithm, we exploit the inherent feature of unimodular transformation matrix P that remains the same for the adjacent highly correlated subcarriers. Complexity simulations demonstrate that the adaptive LR algorithm could eliminate up to approximately 90 percent of the multiplications and 95 percent of the divisions of the brute-force LR algorithm with large coherence bandwidth. The results also show that the adaptive algorithm with both optimum and globally suboptimum initial interval settings could significantly reduce the LR complexity, compared with the brute-force LR and fixed interval LR algorithms, while maintaining the system performance.

DOI10.4218/etrij.12.0111.0707
Short TitleETRI J