基于认知无线电的GSM频段占用分析与建模  

Analysis and modeling of spectrum use of GSM bands based on cognitive radio

作　　者：赵小兰[1] 邓敏[1] 李海宏 胡斌杰[1] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510640 [2]中山市无线电监测站,广东中山528400

出　　处：《电波科学学报》2013年第4期622-628,共7页Chinese Journal of Radio Science

基　　金：NSFC-广东省联合基金重点项目(U1035002);粤港关键领域重点突破招标项目(2011A011305001;2011A011302001);广东高校产学研基地及科技成果转化重大项目(CGZHZD1102)

摘　　要：对E-GSM、GSM900、DCS1800频段进行了七天频谱监测,统计分析结果表明:不同业务的利用情况不尽相同,上下行信道的占用情况存在较大差异,上行信道的占用度相对较低,并随日常作息呈现出夜间较空闲、工作时段较繁忙的规律.同时,分析了信道的电平概率分布以及占用度概率分布,对信道的占用状态用离散二状态马尔科夫链来建模,并分析了信道空闲持续时长与占用持续时长的概率分布,服从指数分布的修正形式.还仿真分析了不同性能的认知无线电系统对频段利用率的影响.Spectrum measurement for seven days of E-GSM, GSM900 and DCS1800 bands based on cognitive radio is conducted. By statistical analysis, results show that the utilizations of different services are not the same, and it has significant difference between the occupancies of uplink and downlink channels. The occupan-cy of uplink channels is relatively lower than that of downlink, reflecting the phe-nomenon of being more vacant while people are resting at night, and busier while working. Meanwhile, the probability distributions of channel occupancy and signal level are analyzed. Besides, channel occupancy state can be modeled as a two-state discrete-time Markov chain, and the statistical residence time distributions of chan-nel staying vacant and occupied are simulated, which yield the modified form of ex-ponential distribution. Finally, the effects of cognitive radio with different perform-ance on spectrum utilization are simulated.

关 键 词：频谱测量 信道建模 占用度 GSM频段 认知无线电 

分 类 号：TN92[电子电信—通信与信息系统]