Title :
A Lattice-Reduction-Aided Soft Demapper for High-Rate Coded MIMO-OFDM Systems
Author :
Qi, Xiao-Feng ; Holt, Keith
Author_Institution :
Intel Mobility Group, Woodbridge, NJ
fDate :
5/1/2007 12:00:00 AM
Abstract :
We extend the lattice-reduction (LR) method to MIMO detection for coded space division multiplexing OFDM systems with soft-input decoding. The scheme employs a novel combination of LR, K-best candidate generation, and simple candidate pruning. With a handful of candidates, the receiver is able to approach packet error rate performance of full maximum likelihood detector to within 1 dB, over varying data rates and channel correlations. It is appealing for high-rate coded-MIMO systems operating over quasi-static wireless channels, where the infrequent LR computation amortized over many symbols becomes negligible
Keywords :
MIMO communication; OFDM modulation; channel coding; correlation methods; maximum likelihood decoding; maximum likelihood detection; space division multiplexing; wireless channels; MIMO-OFDM system; channel correlation; coded space division multiplexing; lattice-reduction-aided soft demapper; maximum likelihood detector; multiple input multiple output detection; orthogonal frequency division multiplexing; packet error rate performance; quasistatic wireless channel; soft-input decoding; Detectors; Error analysis; Lattices; MIMO; Maximum likelihood decoding; Maximum likelihood detection; OFDM; Receiving antennas; Signal processing; Transmitting antennas; COM-ESTI; COM-MIMO; COM-OFDM; Coded MIMO-OFDM; MIMO detector; lattice reduction; maximum likelihood;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2006.888090
