Multiple-symbol Differential Space-time Secoding Based on Pruning Automatic sphere decoding algorithm
Pengyi Wang · Jisuanji fangzhen · 2010
In this paper,the pruning automatic sphere decoding(PASD) algorithm is applied on the multiple-symbol differential unitary space-time decoding.Multiple-symbol differential unitary space-time decoding may overcome the error floor caused by conventional differential space-time decoding under the fast-fading channels.But its complexity is exponentially increased with the length of multiple-symbol.Automatic sphere decoding is a scheme that has the least times of multiplication and plus in the sphere decoding which has the maximum-likelihood performance,and the pruning automatic sphere decoding algorithm further reduces the complexity on the condition that the performance worsen less.The computational load is reduced greatly by applying the pruning automatic sphere decoder(PASD) algorithm on the multiple-symbol differential unitary space-time decoding.The result of simulation shows that this scheme reduces the complexity obviously without much penalty of the performance.It gets the better tradeoff between the performance and the complexity.