Title :
An improved complex sphere decoder for V-BLAST systems
Author :
Pham, David ; Pattipati, Krishna R. ; Willett, Peter K. ; Luo, Jie
Author_Institution :
Electr. & Comput. Eng. Dept., Univ. of Connecticut, Storrs, CT, USA
Abstract :
A complex sphere decoding algorithm is presented for signal detection in V-BLAST systems, which has a computational cost that is significantly lower than that of the original complex sphere decoder (SD) for a wide range of SNRs. Simulation results on a 64-QAM system with 23 transmit and 23 receive antennas at an SNR per bit of 24 dB show that the new sphere decoding algorithm obtains the ML solution with an average cost that is at least 6 times lower than that of the original complex SD. Further, the new algorithm also shows robustness with respect to the initial choice of sphere radius.
Keywords :
antenna arrays; decoding; quadrature amplitude modulation; signal detection; 64-QAM; V-BLAST systems; complex sphere decoder; computational cost; receive antennas; signal detection; transmit antennas; Computational efficiency; Computational modeling; Constellation diagram; Costs; Maximum likelihood decoding; Maximum likelihood detection; Receiving antennas; Robustness; Signal detection; Signal processing algorithms; Branch and bound; ML detection; V-BLAST; complex sphere decoder;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2004.833522
