文档介绍：l南京邮电大学通达学院
毕业设计(论文)
题目: 基于加权的认知无线电检测融合技术研究
专业: 通信工程(专转本)
学生姓名: 卓晓寒
班级学号: 08006129
指导教师: 季薇
指导单位: 南京邮电大学通信与信息工程学院
日期: 2011 年 11 月 21 日至 2012 年 6 月 15 日
摘要
本文研究了一种基于加权的认知无线电检测融合技术。为了克服单认知用户检测可靠性低以及多径衰落和阴影效应的问题,于是提出了合作频谱检测技术,虽然解决了上述问题,但在实际工作环境中,单个认知用户由于分布在不同的地理位置和环境,其平均信噪比也会不同,而目前等权重的感知算法没有考虑这些因素的影响,因此它并不是最优的。基于上述问题,本文采用一种加权合作频谱感知技术,它根据单个认知用户工作处在不同的信噪比下,动态地赋予每个认知用户不同的权重,在认知用户将判决送到融合中心后,中心对各个认知用户的判决加以不同的权重后再做出判决,从而可以提高频谱感知的性能。仿真结果表明,加权合作频谱感知不仅克服了目前合作频谱感知方法的不足,其检测性能也优于目前的方法。
关键词:认知无线电;加权;频谱检测;判决;
ABSTRACT
This paper studies the cognitive radio judgement based on the weighted fusion technology. In order to e the problem of low reliability of a single cognitive user judgement and multipath fading and shadowing effects, so the cooperative spectrum sensing technology to solve the above problems, but in the actual working environment, a single cognitive user due to the distribution of different location and environment, the average signal to noise ratio will be different, and the present, and other weight-aware algorithm does not consider the impact of these factors, so it is not optimal. Based on the above problem, a weighted cooperative spectrum sensing technology based on a single cognitive user at different signal to noise ratio, dynamic give different weights of each cognitive user, and the judgment delivered in cognitive users fusion center, the center of each cognitive user's judgment to be the right weight and then make a judgment, which can improve the performance of spectrum sensing. Simulation results show that the weighted cooperative spectrum sensing is not only to e the current lack of cooperative spectrum sensing method, the detection performance is also superior to the current method.
Keywords: cognitive radio;weighted;spectrum sensing;judgement;
目录
第一章绪论 1
论文研究背景 1
1
第二章认知无线电的概述 3
3
3
3
4
5
中的应用 5
网中的应用 5