DocumentCode :
2272928
Title :
Efficient MIMO detection by successive projection
Author :
Su, Karen ; Wassell, Ian J.
Author_Institution :
Dept. of Eng., Cambridge Univ.
fYear :
2005
fDate :
4-9 Sept. 2005
Firstpage :
1681
Lastpage :
1685
Abstract :
This paper presents a new MIMO detector based on successive projection of the received signal onto the faces of the lattice induced by the channel matrix. Analysis of the relationship between successive algorithms like V-BLAST and the maximum likelihood (ML) sphere decoder, which share a common underlying tree structure, leads to the design of the successive projection algorithm (SPA). Although it is a suboptimal detector, we prove theoretically that when ML detection can be realized in a successive manner, i.e., without back-tracking, ML performance is also achieved by the SPA. The advantageous implications of this result are illustrated via simulation of the average bit error rates attained over a 4 times 4 MIMO flat fading channel. For instance, at a target error rate of 10-3 using 16-QAM modulation, a 2.8 dB improvement over the popular V-BLAST detector is observed at a comparable complexity. We also demonstrate a parameterized SPA, which offers performance profiles approaching that of an ML detector
Keywords :
MIMO systems; channel coding; computational complexity; error statistics; fading channels; matrix algebra; maximum likelihood decoding; quadrature amplitude modulation; signal detection; MIMO detection; MIMO flat fading channel; QAM modulation; V-BLAST; channel matrix; maximum likelihood sphere decoder; suboptimal detector; successive projection algorithm; target error rate; tree structure; Algorithm design and analysis; Bit error rate; Detectors; Face detection; Lattices; MIMO; Maximum likelihood decoding; Maximum likelihood detection; Projection algorithms; Tree data structures;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Information Theory, 2005. ISIT 2005. Proceedings. International Symposium on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-9151-9
Type :
conf
DOI :
10.1109/ISIT.2005.1523631
Filename :
1523631
Link To Document :
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