认知无线电网络中基于双门限的能量检测技术研究

摘要：目前，随着无线通信技术的飞速发展和无线通信业务的急速增长，使得无线电频谱资源显得愈发稀缺。认知无线电作为一项新兴的技术，目的是让稀缺的频谱资源能够得到充分利用。认知无线电技术通过检测并发现未被主用户占用的频谱，将此空闲频谱暂时供认知用户使用。因此，频谱检测技术在认知无线电技术中具有重要的作用。在认知无线电技术中，频谱检测技术既能高效地检测出空闲频段，又不能错误地将正在被主用户使用的频谱认为是空闲状态。能量检测方法作为一种简单、高效、易于实现的频谱检测方法，受到人们的极大关注。然而，传统的能量检测方法采用单门限实现频谱检测，具有稳定性差、检测性能不理想等缺点。本文在传统单阈值能量检测的基础上，提出了双阈值能量检测方法。该方法可有效提高频谱检测性能，克服单阈值能量检测方法的缺点。本文理论分析与仿真结果表明双阈值能量检测方法能整体提高频谱检测性能。

关键词：双门限；能量检测；认知无线电；检测性能

Research on Double-threshold Energy Detection Technology in Cognitive Radio Networks

Abstract: At present, with the rapid development of wireless communication technologies and the rapid growth of wireless communication services, radio spectrum resources become increasingly scarce. As an emerging technology, cognitive radio aims to make scarce spectrum resources fully utilized. Cognitive radio technology detects and discovers spectrum that is not occupied by the primary user and temporarily uses this idle spectrum for cognitive users. Therefore, spectrum detection technology plays an important role in cognitive radio technology. In cognitive radio technology, spectrum detection technology can efficiently detect idle frequency bands, but cannot mistake the spectrum that is being used by the primary user to be idle. As a simple, efficient, and easy to implement spectrum detection method, the energy detection method has received great attention. However, the traditional energy detection method uses a single threshold to implement spectrum detection, which has the disadvantages of poor stability and unsatisfactory detection performance. In this paper, based on the traditional single threshold energy detection, a dual threshold energy detection method is proposed. This method can effectively improve the spectrum detection performance and overcome the shortcomings of the single-threshold energy detection method. Theoretical analysis and simulation results show that the dual-threshold energy detection method can improve the spectrum detection performance as a whole.

Keywords:Double threshold;energy detection;cognitive radio;detection performance

摘要 i

Abstract i

目录 iv

1 绪论 1

1.1 引言 1

1.2 频谱检测技术的研究目的与意义 1

1.3 能量检测技术的研究现状与发展 2

2 系统模型 5

2.1 认知无线电 5

2.1.1 认知无线电的定义 5

2.1.2 认知无线电的特点 6

2.1.3 认知无线电网络中基于双门限的能量检测技术研究:http://www.chuibin.com/tongxin/lunwen_205520.html