同轴电缆通信线路的多径衰落概率计算仿真  

Multipath Fading Probability Calculation Simulation of Coaxial Cable Communication Line

作　　者：梁志明[1] 邓洪波[1] 秦惠平 李磊[1] LIANG Zhi-ming;DENG Hong-bo;QIN Hui-ping;LI Lei(School of Electronics and Information,South China University of Technology,Guangzhou Guangdong 510641,China)

机构地区：[1]华南理工大学电子与信息学院,广东广州510641

出　　处：《计算机仿真》2020年第6期160-164,共5页Computer Simulation

摘　　要：当前通信线路的多径衰落研究成果计算值与实际值拟合性较差,为此提出基于差分概率的同轴电缆通信线路的多径衰落概率计算方法。从盲源分离的层面出发,提出数据块更新下的滑动窗口ICA法,基于源信号具备的统计特性,利用观测获取混合信号中的未知源信号,实现通信过程中干扰抑制。在通信线路盲源分离干扰抑制下,引入差分概率理念,将信道增益呈现出的时序关联性和其时序差分量概率统计基本性质相融合,实现同轴电缆通信线路的多径衰落幅值概率计算。实验结果表明,上述方法可有效抑制通信线路中的干扰项,计算值与实际值拟合性较好,且计算精度高,是一种可靠的通信线路多径衰落概率计算方法,同轴电缆能够在比较长的无中继器线路上进行高带宽的通信,应用范围广泛,其通信线路的多径衰落情况对其改进优化而言意义重大。The calculation result of multi-path fading of current communication line deviates significantly from the actual value. Therefore, a method for calculating the multi-path fading of coaxial cable communication line based on the difference probability was proposed. From the perspective of blind source separation, a sliding window ICA method based on data block updating was proposed. Based on the statistical characteristics of source signal, the unknown source signal in mixed signal was obtained by observation, and then the interference suppression in the communication process was realized. Under the interference suppression of blind source separation of communication lines, the concept of differential probability was introduced to integrate the temporal correlation of channel gain with the basic properties of probability statistics of temporal difference, so as to realize the probability calculation of multipath fading amplitude of coaxial cable communication lines. Simulation results show that the proposed method can effectively suppress the interference terms in communication line. The calculated values are in good agreement with the actual values, and the calculation accuracy is high. It is a reliable method to calculate the multipath fading probability of communication lines. Coaxial cable can communicate with high bandwidth on long line without repeater, so it has a wide range of applications. The multi-path fading of communication lines is significant to its improvement and optimization.

关 键 词：同轴电缆 通信线路 多径衰落 差分概率 

分 类 号：TP391.1[自动化与计算机技术—计算机应用技术]