摘要
为提高WiMAX系统频谱利用率,减小与其他系统之间的干扰,实现共存,利用感知无线电的周期图频谱检测和频谱池技术,对WiMAX性能加以改进。采用WiMAX系统802.16e基带链路,信道模型选用M.1225中规定的VA车载信道。在频谱感知模块中,频谱模型在由频点相互独立的256个瑞利衰落正弦信号叠加构成。每帧数据传输开始时,二级用户利用周期图频谱检测技术对信道频段进行检测,获得频谱空洞,然后采用频谱池技术在频谱空洞上传输数据。仿真结果表明,WiMAX系统中采用感知无线电技术,可在减小对二级用户干扰的同时,避免对一级用户的影响,从而提高了频谱利用率,使系统性能得到很大提高。
The spectrum resource of WiMAX system is very scarce. How to improve the spectrum utilization and reduce interference with other systems to achieve co-existence needs to be resolved. The performance and spectrum utilization improvement of WiMAX system is studied by using periodogram detection and spectrum pool technology. WiMAX systems 802. 16e baseband link is used, and channel model is M. 1225 VA channel. In the spectrum sensing module, spectrum model is the sum of 256 Rayleigh fading signal sine whose frequency bins are independent of each other. The space between frequency bins is 8 sub-carrier spaces. Before the transmission of each data frame, secondary user use periodogram detection technology to detect spectrum hole, then transmit data on the spectrum hole by spectrum pool technology. The simulation results show that using cognitive radio technology reduces the interference to secondary user and avoid influencing on prime user. The spectrum utilization and performance of WiMAX system is also greatly improved.
出处
《吉林大学学报（信息科学版）》
CAS
2009年第4期341-346,共6页
Journal of Jilin University（Information Science Edition）
基金
国家自然科技基金资助项目(60872037)
航天十一五预研基金资助项目(60872037)
关键词
WiMAX性能
感知无线电
周期图检测
正交频分复用
频谱池
WiMAX performance
cognitive radio
periodogram detection
orthogonal frequency division multiplexing （OFDM）
spectrum pool
