摘要
针对感知无线电(cognitive radio,CR)信道的动态特性,对感知无线电频谱占有模型进行了研究,利用马尔可夫模型对频谱占用情况以及信道状态变化情况进行概率统计和估计,基于估计结果,进行实时预测频谱占用情况和实现信道容量估计,并给出了一个容量估计公式。仿真结果显示信道状态预测及容量估计准确性很高,为基于QoS的感知无线电动态选频提供了很好的参考依据。
For the dynamic features of cognitive radio channel state, the model of spectrum occupancy has been studied in this paper. The Markov models for the spectrum occupancy and channel state prediction was used in the probability of statistic estimate. Based on the results of the estimation, the real-time spectrum occupancy was predicted and the channel capacity estimation was achieved, and at the same time, a new formula for channel capacity estimation was proposed. The simulation results show that the methods of channel state prediction and channel capacity estimation have high accuracy, which provides a good reference for QoS-hased dynamic frequency selection.
出处
《重庆邮电大学学报（自然科学版）》
北大核心
2009年第6期710-716,共7页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
国家自然科学基金(60872037)
重庆市自然科学基金(2008BB2411)
关键词
感知无线电
频谱占有模型
马尔可夫链
信道状态预测
信道容量估计
cognitive radio
spectrum occupancy model
Markova chain
channel state prediction
channel capacity estimation
