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| An Improved QR Based Detection Algorithm for Layered Space-Time Codes |
| Chen Liang; Li Jian-dong; Chen Dong |
| State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China |
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Abstract An improved QR based detection algorithm is proposed for use in the Multiple- Input Multiple-Output (MIMO) communication systems. The method does not require the pseudo inverse of the channel matrix. The probability of error propagation is reduced through serial interference canceling; the minimum error probability signal is removed layer by layer. It has less computational complexity than ordered QR based detection and ordered BLAST detection .Simulation shows that it outperforms the classic BLAST and ordered，suboptimal ordered QR based detection algorithm. In the uncoded 4×4 MIMO system with QPSK modulation, there proposed algorithm outperforms ZF-VBLAST by 2.5 dB and outperforms the sorted QR algorithm 5 dB at a BER of 10-3.
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Received: 22 September 2008
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Corresponding Authors:
Chen Liang
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2010, Vol. 32 
