频谱异构认知无线电中基于吞吐量降的空时频谱机会感知

发布时间：2018-04-03 07:30

本文选题：认知无线电　切入点：动态频谱接入　出处：《电子与信息学报》2014年11期

【摘要】：在认知无线电(CR)中,频谱感知是实现动态频谱接入的关键技术之一。为适当保护主用户并最大化次级用户的性能,目前大部分相关工作均是用虚报概率和漏检概率作为感知度量来确定最佳感知参数的。但这种度量是用主次用户的碰撞概率来衡量次级用户对主用户的影响的,没有考虑干扰强度的影响,仅适合同构频谱环境;在不同位置次级用户有不同接入机会的异构频谱环境中,并不能最大化频谱利用率。为此,该文首先定义了吞吐量降,并提出在异构频谱环境下采用吞吐量降作为一种新的感知度量。吞吐量降是指由于次级用户占用授权频谱而导致主用户吞吐量下降的百分比。在衡量次级用户对主用户的影响时,它综合了主次用户的碰撞概率和干扰强度两个因素;其次,研究了以吞吐量降为约束的次级用户吞吐量优化问题。最后,数值仿真证实了该方案比目前几种传统方案的频谱利用率显著提高。
[Abstract]:In cognitive radio (CR), spectrum sensing is one of the key technologies to realize dynamic spectrum access. For the performance of appropriate protection of primary users and maximize secondary users, most of the current work is to use false probability and the failure probability as a measure to determine the optimal parameters of perception perception. But this measure is the collision probability of the primary and secondary users to measure the effect of the secondary users to primary users, without considering the effect of disturbance intensity, only suitable for homogeneous spectrum environment; heterogeneous environments have different spectrum access opportunities in different position of the secondary users, not to maximize spectrum utilization. Therefore, this paper defines the throughput and the throughput drop down a a new perception as a measure in the heterogeneous environment. The spectrum is due to reduced throughput of secondary users use licensed spectrum due to primary user throughput decreases. The percentage in the balance Effect of the amount of the secondary to the primary user, it combines the primary and secondary users collision probability and interference intensity of two factors; secondly, to study the throughput optimization problem reduced to secondary user throughput constraints. Finally, the numerical simulation shows that the design utilization rate is significantly higher than the current spectrum of several traditional solutions.

【作者单位】：解放军理工大学通信工程学院;中国电子设备系统工程公司研究所;总参通信训练基地;
【基金】：国家973计划项目(2009CB320403) 中国博士后科学基金(2012M512075) 国家自然科学基金重点项目(61231011)资助课题
【分类号】：TN925

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