CAJ | 학술논문

在基于正交频分复用技术的放大转发协作通信系统中,针对整体中继信道估计(S-R-D)辅助导频占用额外带宽使带宽利用率低的缺点以及传统叠加导频信道估计性能不高的缺点,提出了一种新的对角叠加导频方案.在不增加导频数量的前提下,将叠加导频的位置由传统的块状叠加变为对角叠加后,信道估计性能优于传统叠加导频方案和辅助导频方案,且与理想信道估计性能接近.仿真结果表明:和传统方法相比,采用对角叠加导频方案不仅提高了信道估计精度和带宽利用率,而且可以较好地跟踪信道的变化.
재기우정교빈분복용기술적방대전발협작통신계통중,침대정체중계신도고계(S-R-D)보조도빈점용액외대관사대관이용솔저적결점이급전통첩가도빈신도고계성능불고적결점,제출료일충신적대각첩가도빈방안.재불증가도빈수량적전제하,장첩가도빈적위치유전통적괴상첩가변위대각첩가후,신도고계성능우우전통첩가도빈방안화보조도빈방안,차여이상신도고계성능접근.방진결과표명:화전통방법상비,채용대각첩가도빈방안불부제고료신도고계정도화대관이용솔,이차가이교호지근종신도적변화.
In amplify and forward cooperative communication system based on orthogonal frequency division multiplexing,auxiliary pilot has the defect for low bandwidth efficiency due to extra bandwidth occupied,superimposed pilot has the defect of low estimation accuracy. For these problems, a new diagonal superimposed pilot scheme is proposed for the overall relay channel (SRD)estimation in this paper. Without increasing the number of the pilots,the location of the superimposed pilots will overlay from the traditional block to a diagonal superposition,the channel estimation performance is superior to the traditional superimposed pilot scheme and the auxiliary pilot scheme,which is close to the ideal estimation performance. Simulation results show that,compared with the traditional methods, the proposed diagonal superimposed pilot scheme improves the accuracy of channel estimation and bandwidth utilization,and can better track channel change.