CAJ | 학술논문

将裁减自动球形译码算法(PASD)应用于多符号差分酉空时译码.多符号差分酉空时译码可以克服快衰落信道中常规差分空时译码的误码平层问题.但其计算复杂度和多符号窗口的长度成指数增长关系.自动球形算法是最大似然性能球形译码算法中乘加次数最少的方案,裁减自动球形算法在性能恶化很小的前提下进一步减少了该方案的计算复杂度.将裁减自动球形算法应用于多符号差分酉空时译码,可以显著的减少计算量.通过仿真表明,方案在显著减少计算量的情况下,性能的恶化很小,达到了性能和复杂度的较好折衷.
장재감자동구형역마산법(PASD)응용우다부호차분유공시역마.다부호차분유공시역마가이극복쾌쇠락신도중상규차분공시역마적오마평층문제.단기계산복잡도화다부호창구적장도성지수증장관계.자동구형산법시최대사연성능구형역마산법중승가차수최소적방안,재감자동구형산법재성능악화흔소적전제하진일보감소료해방안적계산복잡도.장재감자동구형산법응용우다부호차분유공시역마,가이현저적감소계산량.통과방진표명,방안재현저감소계산량적정황하,성능적악화흔소,체도료성능화복잡도적교호절충.
In this paper,the pruning automatic sphere decoding(PASD)algorithm is applied on the multiplesymbol 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.