Research On Selection Diversity Reception Technique Over Police Digital Trunking

Wireless mobile communication system which is also known as digital cluster is a new form of wireless communication system proposed in recent years.The digital cluster is mainly about two aspects of tasks,providing for personal mobile communication services and achieving mutual communication between group members.It's a new type of practical communication system containing a set of voice intercom,mobile communication and file transmission.In order to conform to the trend of world communication technology development,new digital trunking standard was released in 2013,China--Police Digital Trunking standard.Police digital trunking signal transmission will be affected by multipath fading and Doppler frequency shift in the channel.These two aspects of problems make bad effects on the communication efficiency and the quality of the communication.In view of this situation,this paper studies the issues and introduces new diversity reception technique in Police Digital Trunking system.Firstly,the characteristics of police digital trunking system transmission model is analyzed,the channel environment and signal structure characteristics are given.For police digital trunking signal,new selective baseband diversity system structure is proposed,explaining the police digital trunking baseband diversity key technology and the method of signal processing.The corresponding formula and process analysis is proposed in this paper.Based on the existing theory and algorithm,the simulation environment is modeled by MATLAB software,and the error performance of the whole transmission system is simulated,which proves the effectiveness of the algorithm.The experimental results show that the selection of the base band diversity can improve the error rate of the communication system.At the same time,the complexity of the system is lower,which is suitable for practical engineering.