A modified sphere detection algorithm with lower complexity for MIMO detection

the complexity of sphere detection algorithm is high when the Signal to Noise Ratio (SNR) is low. For this problem, a new type of detection algorithm of sphere decoder is proposed. The new algorithm reduces the radius of sphere when the SNR is low by using the Minimum Mean Square Error (MMSE) algorithm and a compressibility factor. With the result of simulation, It shows that when the SNR is less than 10 dB, the proposed algorithm reduces the average complexity by 10 % compared with original sphere decoding algorithm and does not cause obvious loss of performance.