相关衰落信道下的一种层间联合自适应SR-ARQ传输机制  

Cross-layer adaptive transmission scheme combined with SR-ARQ over correlated fading channels

作　　者：肖峻峰[1] 邱晶[2] 程时端[1] 

机构地区：[1]北京邮电大学网络与交换技术国家重点实验室,北京100876 [2]北京邮电大学电信工程学院,北京100876

出　　处：《通信学报》2006年第4期7-15,共9页Journal on Communications

基　　金：国家自然科学基金资助项目(90204003;60402012);国家重点基础研究发展计划("973"计划)(2003CB314806);中国博士后科学基金资助项目(2003034111)~~

摘　　要：传统自适应传输机制在相关慢衰落信道下有较差的系统性能。针对相关衰落信道,提出了一种层间联合自适应传输机制。利用有限状态马尔可夫链来描述相关衰落信道,同时通过构建一个多状态马尔可夫系统模型来分析系统吞吐性能,并对调制方式和传输分组大小进行优化。另外,推导了系统平均吞吐性能的表达式。仿真结果显示所提出的自适应传输机制在相关衰落信道上能获得更好的系统性能。Conventional adaptive transmission schemes performed poorly in wireless correlated slow-fading channels. A cross-layer adaptive transmission scheme combined with selective repeat automatic repeat request （SR-ARQ） was proposed. A multi-state Markov system model for analyzing the performance of systems and optimizing the selection of modulation levels and packet sizes in correlated fading channels was applied, which was also described by a finite-state Markov chain. A general closed-form expression of the average throughput for our suggested scheme was presented. Numerical results show that our adaptive scheme combined with SR-ARQ can obtain good performance in correlated fading channels.

关 键 词：自适应调制 自适应分组大小 自动重传请求 相关衰落信道 马尔可夫信道 SR-ARQ传输机制 

分 类 号：TN91[电子电信—通信与信息系统]