基于时延约束的认知链路自适应传输策略研究  

Research on Cognitive Link Adaptation Transmission Strategies under Delay Constraint

作　　者：穆晓敏[1] 梁晓[1] 赵海峰[1] 高昊民 

机构地区：[1]郑州大学信息工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2014年第3期39-42,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省重大科技攻关计划项目(112102210507);教育部新世纪优秀人才计划项目(NECT-12-0699)

摘　　要：针对时延敏感性信道的频谱效率,提出一种新的自适应调整传输参数的优化框架,该框架以Underlay与Interweave混合接入模式为背景,以最大化有效频谱效率为目标,将问题建模为在主用户有效频谱效率、认知用户平均发送功率、平均误包率和时延双重服务质量(QOS)约束条件下,主用户和次用户都采用自适应调制编码(AMC)技术调整传输速率的优化问题。数值仿真结果表明引入时延后,在满足上述约束条件的同时,在保护主用户和认知网络频谱效率之间有了更好的权衡.In order to improve the spectral efficiency of delay sensitivity of channel, we present a novel framework of changing the transmission parameters according to the dynamic access mode. Based on the underlayinterweave hybrid access mode, this framework is modeled as a optimization problem in which the primary and secondary users adjust transmission parameters with the constraints of the effective spectral efficiency of the primary link, the average transmission power of the cognitive link, dual quality-of-service （QOS） measures, namely, average packet error rates and time delay, constraints of both links, to maximize the effective spectral efficiency of the cognitive user. The numerical results show that a better tradeoff can be achieved between the protection of primary user and the effective spectral efficiency of cognitive system when the delay is introduced and the constraint is satisfied.

关 键 词：时延 有效频谱利用率 混合接入模式 自适应调制编码 

分 类 号：TN925[电子电信—通信与信息系统]