NC-OFDM在认知无线电中应用的仿真研究  

Application of NC-OFDM in Cognitive Radio

作　　者：李佳珉[1] 康桂华[1] 

机构地区：[1]河海大学计算机及信息工程学院,江苏常州213022

出　　处：《计算机仿真》2009年第9期108-111,共4页Computer Simulation

摘　　要：认知无线电环境中,可用频谱具有分布宽、非连续和动态变化的特性。为了解决环境中数据传输的问题,研究设计能够适应频谱特性的通信系统。首先对系统所处的电磁环境进行动态频谱感知,估计出当前时刻的频谱信息,然后根据频谱信息对系统子载波进行裁剪,只利用未被授权用户使用的子载波以NC-OFDM作为传输技术进行数据传送。当通信环境动态变化时,验证系统是否能够准确的估计出当前的频谱信息,然后仿真比较NC-OFDM和NC-MC-CDMA系统的误码性能,并对其结果进行讨论分析。仿真结果表明:NC-OFDM技术能够适应认知环境中可用频谱的特性,且NC-OFDM系统比NC-MC-CDMA系统具有更好的误码性能。In cognitive radio environment, the useful spectrum has the characteristics of distributing widely, non - continuously and changing dynamically. A communication system adapted to the spectrum characteristic is designed to solve the problem of data transmitting. First, the paper senses the spectrum of the electromagnetic environment dynamically, estimates the spectrum information, and then deactivates the system subcarriers according to spectrum information, chooses NC - OFDM as data transmitting technology to transmit data with the subcarriers which are not used by primary users. When communication environment changes, the work is to verify whether the system can estimate current spectrum information exactly. Finally, the BER performances of NC - OFDM and NC - MC - CDMA are simulated and the results are discussed and analyzed. The results indicate that ： NC - OFDM can be adapted to the characteristic of the spectrum in cognitive radio, and has a better BER performance than NC -MC -CDMA.

关 键 词：非连续正交频分复用 认知无线电 子载波分配 频谱空洞 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]