主次用户传输冲突下认知系统感知时间优化

系统仿真学报 ›› 2016, Vol. 28 ›› Issue (6): 1289-1295.

主次用户传输冲突下认知系统感知时间优化

陈松, 郑娜娥, 王盛

解放军信息工程大学导航与空天目标工程学院,河南郑州 450001

收稿日期:2015-01-13 修回日期:2015-03-19 出版日期:2016-06-08 发布日期:2020-06-08
作者简介:陈松(1986-),男,福建永安,博士,研究方向为移动通信技术;郑娜娥(1984-),女,福建漳浦,博士,讲师,研究方向为MIMO信号处理和无线资源分配。
基金资助:
国家863计划 (2012AA01A505)

Optimization Sensing Slot under Transmission Collision of Primary User and Secondary User in Cognitive Radio System

Chen Song, Zheng Nae, Wang Sheng

School of Navigation and Aerospace Object Engineering, Information Engineering University, Zhengzhou 450001, China

Received:2015-01-13 Revised:2015-03-19 Online:2016-06-08 Published:2020-06-08

摘要/Abstract

摘要： 考虑在认知无线电系统中,次用户正确检测的情况下,主用户与次用户发生传输冲突的情况。引入排队论思想,以M/M/1模型描述主用户的出现模式,在此基础上,综合考虑传输时长、检测概率以及传输冲突等情况,构建频谱利用率与传输时间长度的函数关系式,并通过理论推导证明了,满足一定条件下,传输时间的定义域内频谱利用率的最大值点存在。通过仿真对最大值的存在情况进行了验证,并通过分析发现,仿真所设条件下,传输冲突所带来的频谱利用率损失大于20%,应在系统设计过程中予以充分考虑。

关键词: 认知无线电, 频谱感知, 感知时间, 传输冲突

Abstract: In the cognitive radio system, that the primary user (PU) has collision with the secondary user (SU) when the secondary user (SU) was detected properly was considered. The queuing theory was introduced and the PU’s appearance pattern was described by M/M/1 model. Considering the length of the transmitting slot, detection probability and transmitting collision, the function of spectrum usage and transmitting time were established based on the PU’s appearance pattern. The existence of the maximum value of spectrum usage in the definition domain of the transmitting time was proved by theoretical derivation in some condition. The simulation results provide support to the existence of the maximum value. Furthermore, the loss of spectrum usage caused by transmitting collision is more than 20%, which should be considered during the system design procedure.

Key words: cognitive radio, spectrum sensing, sensing period, transmission collision

中图分类号:

TN929.5

陈松, 郑娜娥, 王盛. 主次用户传输冲突下认知系统感知时间优化[J]. 系统仿真学报, 2016, 28(6): 1289-1295.

Chen Song, Zheng Nae, Wang Sheng. Optimization Sensing Slot under Transmission Collision of Primary User and Secondary User in Cognitive Radio System[J]. Journal of System Simulation, 2016, 28(6): 1289-1295.

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