EV-DO信道估计选径策略探讨

EV-DO是高通公司在cdma2000基础上提出的基于提高分组数据性能的系统标准。文章从数据业务和传统的语音业务的比较说起,介绍了EV-DO系统中区别于cdma2000的技术特征(包括自适应编码、快速自动重复请求机制(ARQ)、速率控制、时隙导频工作方式等),并以此平台为例阐述了信道估计中的选径意义和策略,最后简单分析不同选径策略的性能,其中选径策略的讨论是基于带导频信道的无线系统平台而提出的,具有一定的普遍性。

EV-DO, proposed by Qualcomm on the basis of cdma2000, is a new telecom standard aiming at improving the performance of packet data. Firstly, data services and traditional voice services are compared in this paper, and then some EV-DO technical features including AMC, fast ARQ, rate control and slot pilot mode which are typically different from cdma2000 are introduced. On this platform, the significance and strategy of path selection in channel estimation are also concerned. Finally, the performance of different methods of path selection is analyzed. In addition, the discussion of multi-path selection strategy is based on the wireless system platform containing pilot channel, which is of noticeable universality.