CAJ | 학술논문

　　针对传输正交幅度调制（QAM）信号的多输入多输出（MIMO）无线通信系统中的信号间干扰问题，提出了恒模算法（CMA）和软决策(SDD)算法相结合的混合算法。该方法代价函数结构简单，精确地利用了已知信息，使得均衡后信号具有良好的误码率性能。本文采用共轭梯度法进行优化，与现在常用的梯度类算法相比较，具有快速收敛的特性。最后分别通过信道最大扭曲和收敛速度分析了该算法的可靠性和有效性，且通过计算机仿真证明了该算法的良好性能。
　　침대전수정교폭도조제（QAM）신호적다수입다수출（MIMO）무선통신계통중적신호간간우문제，제출료항모산법（CMA）화연결책(SDD)산법상결합적혼합산법。해방법대개함수결구간단，정학지이용료이지신식，사득균형후신호구유량호적오마솔성능。본문채용공액제도법진행우화，여현재상용적제도류산법상비교，구유쾌속수렴적특성。최후분별통과신도최대뉴곡화수렴속도분석료해산법적가고성화유효성，차통과계산궤방진증명료해산법적량호성능。
The paperfocused on the problem ofintercrossing interference ofsignals forM ultiple-InputM ulti-ple-O utput(M IM O )System s w ith Q uadrature A m plitude M odulation (Q A M )signal.C om bining C onstantM odu-lusA lgorithm (C M A )and SoftD ecision-D irected (SD D )schem e,a m ixture algorithm w ith a com bination ofC M A and SD D is proposed.The costfunction ofthis m ethod has a sim ple form and accurately utilizes the know n infor-m ation,w hich m akes the outputsignalofequalizergood perform ance forsym bolerrorrate.M oreover,conjugate gradientm ethod is adopted to optim ize the costfunction.C om pared w ith the gradient-type algorithm ,w hich is usually used at present,the proposed m ethod converges fast.Finally,m axim um channel distortion and conver-gence speed is applied to analyze the reliability and validity ofthe m ethod respectively. C om putersim ulation re-sultsalso confirm that the proposed m ethod hasgood perform ances.