作　　者： ; ; ;

机构地区： 西安交通大学电子与信息工程学院

出　　处： 《西安交通大学学报》 2013年第4期17-21,34,共6页

摘　　要： 针对分布式空时编码的最大比合并算法(MRC-DSTC)中处理矩阵存在零矩阵的问题,提出了采用随机酉矩阵调制的协作分集传输算法(RU-CD)。在中继节点,该算法首先利用随机生成的酉矩阵对中继节点各个天线上的接收信号进行处理,并通过正交扩频码序列将多个时隙的信号线性合并,随后再通过共轭处理使得中继发送的信号仅占用2个时隙传输;在目的节点,该算法可以利用复信号特性进行解码,实现发送信号实部和虚部的独立解码,因而降低了解码复杂度。仿真结果表明,在系统具有单中继节点以及2个中继节点的条件下,RU-CD算法分别比MRC-DSTC算法的误比特率降低了3dB和5dB左右。 A cooperative diversity transmission scheme using random unitary matrix modulation（RU-CD） is presented to focus on the problem that the combination of maximum-ratio combining（MRC） and distributed space-time coding（MRC-DSTC） scheme has zero matrices in the processing matrix.The new scheme processes received signals at relay antennas by the random unitary matrix,and the orthogonal spreading codes are used to linearly combine the signals of the time-slots.Then the conjugate processing is performed so that the signals of the relay are transported in only two time-slots.The signals are decoded at destination nodes using the properties of the complex signals.The real and imaginary parts of the transmit signals are decoded independently such that the decoding complexity is reduced.Simulation results and comparisons with the MRC-DSTC scheme show that the bit error rate of the RU-CD scheme reduces about 3 dB and 5 dB,respectively,in the cases that there exist one or two relay nodes in the system.

关 键 词： 协作网络 分布式空时编码 最大比合并 随机酉矩阵

领　　域： [电子电信] [电子电信]