截短Turbo混合ARQ及衰落信道下的性能  

Performances of truncated type-Ⅱ hybrid Turbo code ARQ schemes over fading channels

作　　者：张忠培[1] 王艺[1] 周世东[1] 姚彦[1] 

机构地区：[1]清华大学电子工程系

出　　处：《清华大学学报（自然科学版）》2002年第7期889-892,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 (6983 10 3 0 )

摘　　要：为了提高移动通信中数据及图象的传输可靠性 ,需采用自动重传请求 (ARQ)与前向纠错 (FEC)相结合的混合ARQ信道编码 (HARQ)技术 ,该文提出了基于 Turbo码编码的有限次重传 HARQ方案。给出了传输结构及组合译码算法 ,分析了系统通过率 ,讨论了该方案 Turbo码译码迭代次数及帧长度对系统性能的影响。通过分析仿真 ,说明了本方案具有数据存贮量小、系统通过率高。The reliability of data and image transmission in communication systems is usually improved using hybrid channel coding schemes with automatic repeat request (ARQ) and forward error correction (FEC). However, they require unlimited numbers of retransmissions, which makes implementation impossible. This paper presents a new scheme using type II Turbo ARQ with a limited number of retransmissions. The retransmission protocol and algorithms for combined decoding are described and then the throughput performance is analyzed theoretically. Simulations are used to illustrate the effects on system performance for decoding iteration numbers and frame size. The results show that the proposed scheme has high throughput, short delays and easy implementation.

关 键 词：ARQ 衰落信道 信道编码 移动通信 TURBO码 混合自动重请求 通过率 前向纠错 

分 类 号：TN911.22[电子电信—通信与信息系统]