摘要
认知链路接入和传输策略的联合优化可有效提高频谱利用率。提出了一种新的基于动态接入模式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,以最大化平均频谱效率为目标,将问题建模为在主用户平均频谱效率、认知用户平均发送功率和平均误包率等约束条件下,主用户和次用户自适应调整传输参数的优化问题。数值仿真结果表明,相对于单一接入模式,在混合接入场景中,利用自适应调制编码技术(AMC)可以更有效地提高频谱效率。
The joint optimization of spectrum access and transmission strategy can greatly improve spectral efficiency. This paper presents a novel framework of changing the transmission parameters according to the dynamic access mode. Based on the hybrid access mode, this framework is modeled as an optimization problem in which the primary and secondary users adjust transmission parameters with the constraints of the average spectral efficiency of the primary link, the average transmission power of the cognitive link and average packet error rates of both links, to maximize the average spectral efficiency of the cognitive user. The numerical results show that the proposed hybrid mode is superior to the single access mode by means of the adaptive modulation and coding from the aspect of the average spectral efficiency of the cognitive link.
出处
《电子技术应用》
北大核心
2014年第1期111-114,118,共5页
Application of Electronic Technique
基金
河南省重大科技攻关项目(112102210507)
国家自然科学基金项目(61271421)
教育部新世纪优秀人才(NECT-12-0699)
