高层建筑对脉冲多径时延展宽影响分析与建模

Analyzing and Modeling for the Digital Signal Multipath Propagation Time Delay Spread Suffered from Huge Buildings in a City in Mobile Communication System

对北京市区内受高层建筑物影响的数字脉冲信号多径传播时域展宽的实测值进行了分析与建模，给出了多径传播信号时延特性的Ｗｅｉｂｕｌ分布的数学统计模型，分析了接收机带宽对多径传播产生的误码特性的影响。利用这个数学模型能确定出信号在多径传播中，那些路径在传播特性上起主导作用，以最小的误码率选择最佳的接收机带宽。这对于在移动数字通信中，改善由多径效应引起的误码率增高而严重影响通信的传输质量，具有非常重要的指导作用。

The experimental data based on multipath propagation digital signal time delay spread suffered from the huge buildings in Beijing is analyzed and modeled in this paper. A mathematical statistical model of the Weibull distribution to characterize the multipath propagation of the digital signal is presented. The effects of the receiver band to affect the property of the bit error rate(BER) produced by multipath propagation is analyzed. Using the model, the main propagation path of the digital signal can be found out and the optimum receiver band can be chosen by the least BER. It is an important action to improve the propagation quality of communication suffered from rising the BER on multipath propagation in digital mobile radio communication.