摘要
针对认知无线电(Cognitive Radio,CR)需要提高检测概率,有效利用空闲频谱的问题,提出了一种各用户相互协作检测,并通过基函数调制的认知无线电通信系统。系统通过用户协作并采用基于自适应门限的能量检测方法,得到频谱环境的估计,并产生与授权信号相正交的子基函数,将子基函数卷积级联生成系统基函数,通过将数据调制到系统基函数上,实现认知无线电的收发。仿真表明:该系统能够提高检测概率和降低误码率,具有较好的抗干扰性,并能够充分利用空闲频谱。
In order to improve the probability of spectrum detection for Cognitive Radio （CR） and utilize the idle spectrum efficiently, a CR system based on cooperative detection and basic function modulation was proposed. Through the cooperation and adopting the energy detection with auto-adapted threshold, the CR system obtained the spectrum estimation and generated the sub-basis functions which were orthogonal with primary users＇ signals. The sub-basis functions were connected to be the system＇ s basis function by convolution, and the system implemented receiving and transmitting through modulating the data on the system＇ s basis function. Simulation showed that the system could improve the detection probability and debase the Bit Error Rate （BER）. Its anti-interference and utilization of the idle spectrum were predominant.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2010年第1期201-205,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
863国家高技术研究发展计划(2008AA12Z305)
关键词
认知无线电
协作检测
能量检测
自适应门限
基函数
cognitive radio
cooperative detection
energy detection
auto-adapted threshold
basis function
作者简介
刘鑫（1984-），男，博士．研究方向：认知无线电．E-mail：liuxinstar1984@sohu．com
