TFRC在认知无线电环境中的性能分析及改进  

Performance Analysis and Improvement of TFRC in Cognitive Radio Environment

作　　者：彭光超[1] 刘延伟[1] 胡亚辉[1] 唐晖[1] 

机构地区：[1]中国科学院声学研究所高性能网络实验室,北京100190

出　　处：《微计算机应用》2011年第6期27-33,共7页Microcomputer Applications

摘　　要：TCP友好速率控制协议(TCP Friendly Rate Control,TFRC)能够有效支持多媒体传输,而其在认知无线电环境中少有研究。本文通过在认知无线电环境中对TFRC进行仿真,考察了①感知周期,②主用户干扰,③信道异构性三个因素对TFRC性能的影响,进而提出了一种反馈机制改善TFRC对频谱切换前后信道容量变化适应的能力。实验结果表明TFRC性能与信道检测时长和主用户行为有着密切关系,提出的改进方法可以有效的提高TFRC在认知无线电环境中的性能。TCP Friendly Rate Control（TFRC） is one of the transport protocols which can deliver the multi-media efficiently.However,TFRC obtains little attention in cognitive radio environment.In this paper,TFRC is simulated with cognitive radio channels,by considering the impact of three factors： i） spectrum sensing interval,ii） primary users＇ activity,and iii） channel heterogeneity,and then a feedback way is proposed to improve the performance of TFRC for heterogeneous channel after spectrum handoff.The simulation results show that the sensing interval and primary user interference have a great effect on the performance of TFRC,and also show that the proposed feedback way can enhance the efficiency of TFRC.

关 键 词：认知无线电 TCP友好速率控制协议 性能分析 异构信道 

分 类 号：TN925[电子电信—通信与信息系统]