x信道中一种改进的空时编码传输方案 an improved space-time coding transmission scheme in x channel.pdfVIP

第41卷　 第4 期 　 计 算 机 工 程 2015年4 月 　 　 Vol.41　 No.4 　 Computer Engineering April2015 ·移动互联与通信技术 · 文章编号:1000-3428(2015)04-0092-04　 　 　 文献标识码:A　 　 　 中图分类号:TP391 X信道中一种改进的空时编码传输方案 李　 亚,田心记 (河南理工大学计算机科学与技术学院,河南 焦作454000) 摘　 要:为提高空时编码传输效率,提出一种在X信道中为每个用户配置2 根天线的改进空时编码传输方案。 每个用户采用全速率全分集空时分组码,将每个码字的部分元素旋转适当的角度,并且对每个码字进行两层预 编码。 通过一层预编码使得每个接收端的非期望接收码字对齐,在每个码字中引入零向量以及接收端的线性 运算,消除每个接收端的非期望接收码字。 通过另一层预编码使得每个接收端的期望接收码字正交传输,从而 消除多用户干扰。 仿真结果显示,与相同场景中已有空时编码传输方案相比,该方案能有效提高传输效率,且 可靠性较优。 关键词:X信道;空时分组码;预编码;多用户干扰;传输效率;全分集 中文引用格式:李　 亚,田心记.X信道中一种改进的空时编码传输方案[J].计算机工程,2015,41(4):92-95,101. 英文引用格式:Li Ya,Tian Xinji.An Improved Space-time Coding Transmission Scheme in X Channel[J].Computer Engineering,2015,41(4):92-95,101. An Improved Space-time Coding Transmission Scheme in X Channel LI Ya,TIAN Xinji (School of Computer Science and Technology,Henan Polytechnic University,Jiaozuo454000,China) 【Abstract】 An improved space-timecodingtransmission schemeisproposedinXchannel withtwoantennasat eachuser. Each user employsfull-rate full-diversity space-time block code.Part elements of each codeword are rotated by a certain angle and each codeword is pre-coded twice.One-level pre-coding aligns the unwanted codewords at each receiver.The unwanted codewordsfor each receiver are eliminated by the introduction of zero vector at each codeword and the linear operation at the receivers.The wanted codewordskeepsorthogonal by the other pre-coding,thusthe multi-user interference iscancelled.The transmission efficiency is improved compared with the existing space-time coding transmission for the same scene. Simulation results show that,with the same tran