Low-complexity soft-output K-Best MIMO decoder in 2#x00D7;2 spatial multiplexing system

摘要

This paper presents algorithm of low-complexity K-Best MIMO decoder algorithm applied in 2×2 spatial multiplexing system with 64-QAM modulation. Low computational complexity in the proposed algorithm is achieved by separating real and imaginary computation. We also discovered that some complex-value multiplications can be reduced into two real-value multiplications without affecting performance. These improvements increase the suitability of K-Best algorithm to be applied in real-time VLSI implementation. Finally, we verified the proposed K-Best algorithm performance and compared it with the performance of conventional algorithm in term of Bit Error Rate (BER) using IEEE 802.16–2009 WiMAX system as an implementation platform. The proposed algorithm can achieve computational reduction in Partial Euclidean Distance (PED) calculation as high as 57.78% for real-value adders and 74.93% for real-value multipliers compared with conventional K-Best.