CAJ | 학술논문

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。
위제고공시편마전수효솔，제출일충재X신도중위매개용호배치2근천선적개진공시편마전수방안。매개용호채용전속솔전분집공시분조마，장매개마자적부분원소선전괄당적각도，병차대매개마자진행량층예편마。통과일층예편마사득매개접수단적비기망접수마자대제，재매개마자중인입령향량이급접수단적선성운산，소제매개접수단적비기망접수마자。통과령일층예편마사득매개접수단적기망접수마자정교전수，종이소제다용호간우。방진결과현시，여상동장경중이유공시편마전수방안상비，해방안능유효제고전수효솔，차가고성교우。
An improved space-time coding transmission scheme is proposed in X channel with two antennas at each user. Each user employs full-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 codewords for each receiver are eliminated by the introduction of zero vector at each codeword and the linear operation at the receivers. The wanted codewords keeps orthogonal by the other pre-coding,thus the multi-user interference is cancelled. The transmission efficiency is improved compared with the existing space-time coding transmission for the same scene. Simulation results show that, with the same transmission rate, the transmission efficiency of the proposed scheme it can improve transmission efficiency,and has high reliability in same transmission rate.