基于OFDM的跨小区下行链路异步多用户检测  

Asynchronous multi-user detection for cross-cell downlink OFDM systems

作　　者：李海涛[1] 林孝康[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《计算机工程与设计》2009年第1期61-62,65,共3页Computer Engineering and Design

基　　金：清华-高通CDMA无线通信研究计划基金项目(20073000463)

摘　　要：针对3GPP长期演进计划(LTE)下行链路的OFDMA传输以及基站之间异步部署的特点,引入了异步OFDM干扰消除问题来改善小区边缘用户的服务质量以及提高整个蜂窝系统的下行容量。在同步OFDM-IDMA原理的基础上,提出了低复杂度的基于滑动窗口的异步多用户检测算法。仿真结果表明,在窗口长度很小的情况下,该异步检测算法仍然可以在高信噪比区域接近同步的性能。To enhance the downlink service quality of cell-edge users in an OFDMA cellular system with asynchronous base station deployment, an issue of asynchronous interference cancellation based on OFDM is introduced. Another benefit from it is to increase the downlink system capacity. Based on the principle ofsynchronous OFDM-1DMA, alow-complexitysliding-windowbasedasynchronous multi-user detection algorithm is proposed. Simulation results show that even with a small window size, the asynchronous detection can achieve the performance of synchronous case in the high SNR region

关 键 词：正交频分复用 交织分多址 下行链路 异步多用户检测 滑动窗口 

分 类 号：TN914.5[电子电信—通信与信息系统]