非理想信道状态信息下自适应SC-FDMA上行链路有效吞吐量分析  

Throughput Analysis of Adaptive Uplink SC-FDMA System with Imperfect Channel State Information

作　　者：赵志信[1,2] 郭庆[1] 

机构地区：[1]哈尔滨工业大学通信技术研究所,黑龙江哈尔滨150080 [2]黑龙江科技学院电气与信息工程学院,黑龙江哈尔滨150027

出　　处：《四川大学学报（工程科学版）》2012年第5期149-154,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家科技重大专项资助项目(2010ZX03003)

摘　　要：为有效利用非理想信道状态信息(imperfect channel state information,ICSI)进行自适应资源调度以提高链路平均有效吞吐量,给出了采用M-QAM调制方式时ICSI下用户平均成功传输速率公式,通过仿真验证了其正确性,并据该公式提出一种基于ICSI的自适应调制方案。通过分别研究ICSI对自适应子载波分配和自适应调制的影响,分析ICSI可靠度对链路平均有效吞吐量的影响。仿真结果表明,基于ICSI的自适应调制方案可有效对抗ICSI可靠度下降对平均有效吞吐量的影响;相比之下,采用自适应子载波分配算法时,ICSI可靠度的下降对链路平均有效吞吐量的影响较大。In order to use imperfect channel state information（ICSI） to adaptively schedule resources more effectively so as to improve uplink average throughput,an expression of average successfully transmitted rate of a user in a uplink system was derived using ICSI and M-QAM modulation,and its accuracy was verified by simulation.A adaptive modulation scheme using ICSI was proposed based on the expression.Through investigating the impact of ICSI on adaptive subcarrier allocation and adaptive modulation respectively,the impact of the reliability of ICSI on uplink average throughput was analyzed.Simulation results showed that the proposed adaptive modulation could fight against the impact of decrease of the reliability of ICSI on average throughput effectively.By contrast,the decline of the reliability of ICSI had a more remarkable impact on average throughput of uplink with adaptive subcarrier allocation alogrithm.

关 键 词：单载波频分多址 信道状态信息 有效吞吐量 自适应调制 

分 类 号：TN914.5[电子电信—通信与信息系统]