计算机工程Issue(7)：37-41,5.DOI:10.3969/j.issn.1000-3428.2014.07.007
基于认知无线电的频谱感知及TCP跨层设计
Spectrum Sensing and TCP Cross-layer Design Based on Cognitive Radio
摘要
Abstract
Most of the existing studies about TCP protocol in Cognitive Radio(CR) network assume that the Secondary User(SU)’s perception is perfect. These studies also do not consider the TCP protocol parameters and sensing time’s influence on the TCP performance. To solve the above problems, this paper proposes an improved TCP protocol which has the transmission pre-judgment ability based on the TCP Westwood(TCPW) protocol. It builds the cross-layer TCP throughput model on the basis of CR networks. Due to the perception errors of secondary user, its spectrum sensing and access problem is modeled as a Partial Observable Markov Decision Process(POMDP) which is then converted to belief state Markov Decision Process(MDP), with the Sarsa(λ) algorithm to achieve the solution of Belief State Markov Decision Process(BMDP) model. It can achieve the optimal sensing time while TCP throughput has the maximum value. Simulation results show that the TCP congestion window value obtains with this scheme is about 42%more than using the TCP Reno protocol, and is about 27%more than using the TCP Newreno protocol. The average throughput obtains with this scheme is about 5.7% higher than using TCP Reno, and is about 5.5%higher than using TCP Newreno. When the sensing time is 0.2 s, the resulting TCP average throughput is the maximum.关键词
TCP Westwood协议/部分可观测马尔可夫决策过程/频谱感知/Sarsa(λ)算法/TCP吞吐量/感知时间Key words
TCP Westwood(TCPW) protocol/Partial Observable Markov Decision Process(POMDP)/spectrum sensing/Sarsa(λ) algorithm/TCP throughput/sensing time分类
信息技术与安全科学引用本文复制引用
林正红,江虹,殷明勇..基于认知无线电的频谱感知及TCP跨层设计[J].计算机工程,2014,(7):37-41,5.基金项目
国家自然科学基金资助项目(61072138,61379005)；国防基础科研计划基金资助项目；西南科技大学研究生创新基金资助项目(13ycjj37)。 （61072138,61379005）
