OFDM技术在认知无线电中应用的研究

Research on application of OFDM technology in cognitive radio system

随着无线通信技术的迅速发展,频谱资源变得越来越紧张,如何充分利用频谱资源成为热点问题。认知无线电技术是解决这一问题的新方法,而OFDM技术灵活的选频方案为实现认知无线电系统提供了良好的平台。本文在阐述了两种技术各自优势和融合的可行性的基础上,提出了一种基于OFDM技术的认知无线电系统设计方案,包括系统的频率分配算法,系统框图和工作流程。在此基础上,仿真实现了基于OFDM技术的认知无线电系统,该系统在达到用户通信要求的同时,可以更加合理地分配和利用频谱资源,使系统的性能有显著的改善。

With the rapid development of wireless communications technology, wireless spectrum resources are more and more uptight. How to improve the efficiency of radio resources becomes a hot spot problem. The cognitive radio technology brings a new idea for solving this problem and has a favorable base of OFDM technology because of its agile choice mechanism of frequency. With the expatiation of each advantage and feasibility of the combination, this article puts forward a scheme of cognitive radio system based on OFDM technology, which includes arithmetic of frequency assignment, architecture of the system and event flow. On the basic of the above, we simulate the OFDM technology in cognitive radio system. As well as meeting the requirement of communication, this system can use the spectrum resources more sufficiently by reasonable allotment, and consequently economizes precious radio resources, which improved the performance of the system.