Title :
A low complexity MIMO system based on BLAST and iterative anti-Gray-demapping
Author :
Boronka, Alexander ; Speidel, Joachim
Author_Institution :
Inst. of Telecommun., Stuttgart Univ., Germany
Abstract :
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 anti-Gray code. At 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 MlMO fading channels with additive white Gaussian noise. For a 6 × 6 MIMO channel our low complexity scheme can provide a turbo cliff at Eb/No = 8.5 dB for 16-QAM.
Keywords :
AWGN channels; Gray codes; MIMO systems; error statistics; fading channels; quadrature amplitude modulation; Bell -Laboratories layered space-time algorithm; MlMO fading channels; additive white Gaussian noise; anti-gray code; convolutional encoder; extrinsic information transfer chart; iterative QAM demapper; wireless multiple-input multiple-output systems; Additive white noise; Bit error rate; Computer simulation; Convolutional codes; Fading; Iterative algorithms; MIMO; Quadrature amplitude modulation; Signal to noise ratio; Transmitters;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings on
Print_ISBN :
0-7803-7822-9
DOI :
10.1109/PIMRC.2003.1260343
