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An improved complex sphere decoder for V-BLAST systems

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4 Author(s)
Pham, D. ; Electr. & Comput. Eng. Dept., Univ. of Connecticut, Storrs, CT, USA ; Pattipati, K.R. ; Willett, P.K. ; Jie Luo

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.

Published in:

Signal Processing Letters, IEEE  (Volume:11 ,  Issue: 9 )