基于频谱聚合技术的多用户短波机会频谱接入  

Multi-User HF Opportunistic Spectrum Access Based on Spectrum Aggregation

作　　者：徐承龙[1] 程云鹏[1] 董文斌[2] 孙浩[3] 

机构地区：[1]解放军理工大学通信工程学院 [2]中国人民解放军63810部队 [3]中国人民解放军77226部队

出　　处：《数据采集与处理》2016年第2期370-376,共7页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(60932002;61172062)资助项目;江苏省自然科学基金(BK2011116)资助项目

摘　　要：研究了分布式短波机会频谱接入系统中的信道探测问题。由于频谱资源的稀缺性,将认知无线电技术应用到短波通信得到了广泛关注。多个次级用户按序感知授权信道,根据感知结果决策出授权信道是否可用,利用频谱聚合技术实现数据传输。然而频谱聚合的能力受到无线通信设备的约束。本文提出一种在硬件受限条件下,考虑次级用户间相互影响的动态的停止方法。在该方法中,信道空闲概率能够随着信道探测过程而改变,并且次级用户能够定期地释放先前时隙感知的信道。仿真结果表明,所提的动态停止方法能够有效提高短波通信系统的网络性能。The channel exploration problem is analyzed for the distributed HF opportunistic spectrum ac‐cess （OSA ） system .Due to the scarcity of the spectrum resources ,applying the cognitive radio technolo‐gy to the HF communication system has called extensive attentions .Multiple secondary users （SUs） se‐quentially sense multiple licensed channels .Then the system decides whether the channels can be used based on the sensing results .Thus ,the data can be transmitted utilizing available spectrum bands by u‐sing spectrum aggregation technology .However ,the ability of spectrum aggregation is constrained by hardware limitations .Therefore ,a dynamic stopping approach is proposed considering the interaction a‐mong the SUs under the constraint of the hardware limitations .In the proposed stopping approach ,the channel‐free probability can vary with the process of channel exploration and the SUs can periodically re‐lease the previously sensed channels .Moreover ,simulation results show that the throughput perform‐ance of the HF communication system can be effectively improved by the proposed dynamic stopping ap‐proach .

关 键 词：短波通信系统 机会频谱接入 最优停止原理 频谱聚合 多用户 

分 类 号：TN929.5[电子电信—通信与信息系统]