新型警用数字集群信号基带分集接收技术

New technique of base band diversity reception for PDT signal

为了解决警用数字集群信号(PDT)在传输过程中面临的多径衰落和多普勒频移问题,研究了警用数字集群信号的分集接收新技术。首先介绍了PDT系统模型,分析了所研究的信道环境和信号结构特征。在此基础上提出了一种新的选择式基带分集系统结构,分析了基带分集关键技术和信号处理流程。结合理论分析,给出软件仿真结果。实验结果证明,所采用的选择式基带分集对通信系统误码率特性改善明显。同时,算法复杂度较低,运算量小,适合在实际工程中使用。

In order to solve the problem of multipath fading and Doppler interference in the transmission of Police Digital Trunking（PDT）signal,we proposed new diversity reception technique for PDT signal.Firstly PDT system model is given,the fading channel conditions and signal structure characteristics are analyzed at the same time.On this basis,the structure of new base band diversity technique and the key algorithm of processing procedure are proposed.Along with theoretical analysis,software simulation results are presented.The simulation results show that the proposed post-detection diversity technique provided an obvious improve of bit error rate performance for communication systems.Because of the low system complexity and computation reduction,the presented diversity structure is suitable for using in practical engineering.