A low complexity MIMO system based on BLAST and iterative anti-Gray-demapping
نویسندگان
چکیده
We present a low complexity encoder and mapper for wireless multiple-input multiple-output (MIMO) systems. The BLAST (Bell Laboratories Layered Space-Time) algorithm is enhanced by a dedicated iterative QAM demapper with antiGray code. At the the transmitter a low complexity convolutional encoder and a QAM mapper with anti-Gray code are used, whose EXIT (Extrinsic Information Transfer) chart are matched to obtain a BER turbo cliff at low SNR. Computer simulations are presented for 4×4, 6×6, and 8×8 MIMO fading channels with additive white Gaussian noise. For a 6×6 MIMO channel our low complexity scheme can provide a turbo cliff at Eb/N0 = 8.5 dB for 16-QAM.
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