HSDPA中的H-ARQ技术分析

HSDPA（High Speed Downlink Packet Access）即高速下行分组接入技术是3G中的一项重要技术。它作为一种无线增强技术极大的提高了系统的下行数率，而且同时适用于WCDMA和TD—SCDMA系统。HSDPA中引入了自适应调制和编码技术（AMC）、混合自动请求重发（H—ARQ）、快速小区选择（FCSS）、MIMO技术等关键技术。主要研究其中的H—ARQ（Hybrid Automatic Repeat reQuest）技术。首先介绍H—ARQ的起源及三种不同类型H—ARQ的特点，其次研究了H—ARQ在HSDPA中的应用，最后对不同H—ARQ方案的性能进行了分析。

Analysis of H-ARQ in HSDPA

High speed downlink packet access(HSDPA) is an enhanced wireless access technology which is being developed as the evolution of 3G systems.It is extremity to increase the downlink data rates and can be both used in WCDMA and TDSCDMA systems.A number of performance enhancing technologies are included in HSDPA,such as AMC,H-ARQ,FCSS,MIMO etc.This paper mainly researches on the H-ARQ technology.The origin and three kinds H-ARQ are been introduced,the functions of H-ARQ in HSDPA are been discussed.Finally,the performances of different H-ARQ schemes are analyzed.