DocumentCode :
1972402
Title :
On complexity of sphere decoding with novel sphere radius determining method
Author :
Yuan Qi ; Rongrong Qian
Author_Institution :
Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China
fYear :
2011
fDate :
14-16 Oct. 2011
Firstpage :
71
Lastpage :
75
Abstract :
In this article a non-heuristic sphere radius determining method for sphere decoding is developed so that the sphere radius could be properly chosen to restrict the complexity as much as possible without incurring evident performance loss. A special bound of symbol error ratio performance of maximum likelihood detection is formulated which can serve as a lower bound in low signal to noise ratio (SNR) region. Thus the sphere radius determining method can be presented with a SNR dependent probability employing the bound. Then a modification of radius determining method is introduced using a compress factor suppressing the sphere radius in low SNR region to make the expected complexity tolerable. The expected complexity analysis is performed based on the expected number of all visited nodes for all search levels. Finally, simulation results show the effectiveness of the proposed sphere radius determining method within the whole SNR region.
Keywords :
MIMO communication; decoding; maximum likelihood detection; probability; MIMO system; SNR dependent probability; compress factor suppression; maximum likelihood detection; multiple-input multiple-output system; nonheuristic sphere radius determining method; signal to noise ratio; sphere decoding complexity; symbol error ratio performance; MIMO; expected complexity; sphere decoding;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Communication Technology and Application (ICCTA 2011), IET International Conference on
Conference_Location :
Beijing
Type :
conf
DOI :
10.1049/cp.2011.0632
Filename :
6192828
Link To Document :
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