The Research Of Multi-user Detection Technique In The TD-SCDMA Trunking System

The TD-SCDMA trunking system is based on TD-SCDMA Radio Access Technology, which is the 3GPP international standard with the independent intellectual property of our state, so this system conforms to the development direction of the future trunking systems. Based on the working characteristics of the trunking communication, this paper makes the research on the application of the multi-user detection technology in TD-SCDMA trunking system, finds out the multi-user detection algorithms suitable for the TD-SCDMA trunking system.Firstly, this paper outlines the multi-user detection technology. Introduce the frame structure, basic parameters and key technologies of TD-SCDMA system in detail, and make the comparison between trunking systems and cellular systems, give the network structure of TD-SCDMA trunking system.Based on the data transmission model of the uplink and downlink in TD-SCDMA cellular system, this paper researches on several typical multi-user detection algorithms, and make the simulation and analysis about these algorithms.This paper mainly researches on the application of the multi-user detection technology in TD-SCDMA trunking system. This paper introduces the multi-user detection technology into TD-SCDMA trunking system and builds the data transmission model of the downlink in the system. Simulate the multi-cell joint detection algorithms and the results show that the multi-cell joint detection technology can effectively resolve the multi-cell interference problem in the downlink point-to-multipoint communication mode of TD-SCDMA trunking system.This paper also makes the combination of the micro-diversity technology and multi-user detection technology, the interference cancellation technology and the multi-user detection, the interference coordination techniques and the block linear equation techniques. At last, make the simulation and comparison of these methods in TD-SCDMA trunking system. The simulation results show that these methods have better system performance.