瑞利衰落信道下SR-ARQ-AMS系统时延性能研究  

On delay performance of SR-ARQ-AMS over Rayleigh fading channels

作　　者：黎锁平[1,2] 高彦[1] 侯尚林[1] 马成业[1] 

机构地区：[1]兰州理工大学理学院,甘肃兰州730050 [2]甘肃省工业过程先进控制重点实验室,甘肃兰州730050

出　　处：《系统工程学报》2012年第4期552-558,共7页Journal of Systems Engineering

基　　金：教育部"春晖计划"基金资助项目(Z2006-1-62006);甘肃省自然科学基金资助项目(0809RJZA019)

摘　　要：针对瑞利衰落信道,对一种结合选择式自动请求重传(SR-ARQ)技术的自适应调制系统(SR-ARQ-AMS)及其传输原理进行了分析,构造了一个有限状态Markov链来描述其瑞利衰落信道.利用等效时延的思想,建立了发送端带有休假的M/G/1非空竭服务排队模型描述该自适应调制系统.考虑了经有限次传输未成功分组的服务时延对系统时延性能的影响,求得了该系统分组平均等待时延、分组平均时延和归一化最大吞吐量的解析式.通过数值模拟分析了各参数对系统时延性能的影响,进而得到提高系统传输速率的方法.仿真结果表明SR-ARQ-AMS在瑞利衰落信道下能获得更好的系统时延性能.Conventional adaptive transmission schemes performed poorly in wireless correlated slow-fading channels. The transmission scheme and the system model of adaptive modulation system combined with selective repeat automatic repeat request （SR-ARQ） over Rayleigh fading channels is analyzed firstly, a finite- state Markov chain is modeled for describing Rayleigh fading channels and adaptive modulation system. A queuing model with vacations is established by using the equivalent service delay method. The expression of system＇s main performance measures, such as system＇s average waiting delay time, average delay time and normalized maximum throughput are gained, which take into account the delay of lost packet transmitting limited times. The influence of various parameters on system delay is analyzed by numerical simulation and then we obtain the method to enhance system transmission efficiency. Numerical results show that SR-ARQ- AMS offers a better delay performance in Rayleigh fading channel.

关 键 词：SR—ARQ—AMS 休假排队模型 平均服务时延 有限状态Markov模型 

分 类 号：O226[理学—运筹学与控制论] N945.12[理学—数学]