A Low Complexity Pre-processed Sphere Decoding Algorithm for MlMO Detection
Zuo Guangxia · Signal Processing · 2009
A new low complexity pre-processed sphere decoding algorithm for multiple-input multiple-output(MIMO) detection is proposed.The sphere decoding is a low complexity algorithm which may achieve the maximum-likelihood performance,but the complexity is still high when the Signal-to-Noise(SNR) is low or the modulation is in high order,and the complexity even approaches to the brutal search method.The columns of the channel matrix have been rearranged according to the soft information gotten from the zeroforcing decoding,so the order of the solution changed accordingly.This reduces the complexity of the sphere decoding greatly when the SNR is low or the modulation is high order.The result of simulation demonstrates that the complexity has been reduced nearly 1/3 when Eb/No in the range of 0～3 and using the 16QAM modulation.