短波信道估计中的三状态HMM性能分析  

Performance Analysis of Three-State HMM in HF Channel Estimation

作　　者：林刚[1] 程云鹏[2] 江汉[2] 陈慧林[1] 王志文[1] 

机构地区：[1]解放军理工大学通信工程学院研究生3队,江苏南京210007 [2]解放军理工大学通信工程学院,江苏南京210007

出　　处：《通信技术》2016年第3期286-292,共7页Communications Technology

基　　金：国家自然科学基金资助项目(No.61301160)~~

摘　　要：针对短波通信ALE协议中信道接入技术存在的不足,已有研究通过引入三状态隐马尔科夫模型(HMM),将该模型用于预测短波信道可用性,选择信道接入。在先前研究基础上通过实测频谱数据来进一步检验该模型的性能,首先考虑短波信道的使用规律,对各频段实测频谱功率进行二次量化得到信道的三状态序列;然后计算三状态HMM下信道状态的预测准确率和空闲信道的利用率。仿真结果表明,三状态HMM的准确率和利用率均在80%以上,而且除了在短波频段表现很好外该模型在其他频段同样性能优异,这在实际场景中具有很高的应用价值。Aiming at the drawbacks of spectrum access strategy in HF ALE protocols, a three-state HMM is introduced to predict the channel availability and determine the channel access in the previous researches. Based on the previous research, the performance of the model is verified via the actually-measured data. Firstly, the usage regulation of HF channel is fully considered, and the secondary quantization on the measured spectrum power of each band is done, thus to acquire three-state sequence of the channel. Then, the prediction accuracy of channel states and the usage rate of idle channel under three-state HMM are calculated. Simulation results show that both the prediction accuracy and the usage rate could reach a value of over 80 percent. In addition to HF spectrum, this model could also exhibit excellent performance in other spectrum, and thus is of fairly high application value in actual scene.

关 键 词：HMM 短波ALE 信道估计 信道接入 

分 类 号：TN92[电子电信—通信与信息系统]