多输入多输出码分多址系统的Turbo联合检测

提出了一种基于随机分层空时结构的上行链路编码多输入多输出码分多址系统，通过在发射天线之间插入空时交织器，使得编码比特在各层随机发送，从而获得空间分集增益．再将Turbo原理应用在基站端，提出了新的Turbo联合检测接收机，它由软入软出空时多用户联合检测器和软入软出译码器构成，检测器与译码器都将对方反馈的编码比特外信息作为自己的先验信息，通过迭代的方法，逐步降低系统误码率．仿真结果表明，经过3次迭代以后，当误码率为10^-4时，Turbo联合检测大约可获得3．4dB增益．

Turbo Joint Detection Algorithm for Multiple-Input Multiple-Output Code Division Multiple Access System

A new uplink encoding multiple-input multiple-output code division multiple access based on random layered space-time(RLST) is proposed.A spatial-time interleaver between each transmitting antennas is inserted in RLST,so that the encoded bits can be transmitted on random layers.At node B,by applying the Turbo principle to the receiver,a new Turbo joint detection(Turbo-JD) receiver is proposed,which is composed of a soft-in soft-out space time multi-user joint detector and some soft-in soft-out decoders.The partner's external information is used by detectors and decoders as their prior information through the fedback encoding bit,and the BER of the system is gradually depressed by iterative method.The simulation shows that the TurboJD algorithm is able to acquire approximate 3.4 dB gain after 3 iterations when BER is 10-4.