Study On Multi-cell Joint Detection For TD-SCDMA Trunking System Terminal

Trunking system belongs to the private mobile communication system, is an advanced, high performance, multi-purpose senior special command system, and represents the direction of development of communication network, digital trunking system based on TD-SCDMA system is being studied hotly in the world.Joint detection technology is a key technology of TD-SCDMA system, but greater part of these already existing joint detection algorithms only can be applied for the base station. More effective algorithm is deficient in user equipment. As TD-SCDMA system is the same frequency network for uplink and downlink, interference effect from the neighboring cells is also very large, therefore, the terminal joint detection also need to consider the elimination of other cells interference.This thesis describes the researches and applications of the TD-SCDMA trunking systems, technologies of the TD-SCDMA trunking system, analysis of potential problems, explain necessity of introducing Terminal multi-cell joint detection. This thesis describes the physical channel of TD-SCDMA system, detailing TD-SCDMA detection algorithm works, focused analysis of three joint detection algorithms for WMF, ZF-BLE and MMSE-BLE.This thesis discusses the joint detection model of the terminal in single cell, built on this basis, analysis of the multi-cell joint detection algorithm for TD-SCDMA trunking system terminal. Finally, by using MATLAB software simulation platform, the thesis puts emphasis on simulation analysis and comparison of ZF-BLE and MMSE-BLE algorithms in Rayleigh fading channel model. Meanwhile, the performance differences of multi-cell joint detection algorithm with different parameters are tested. The influence of macrodiversity joint detection is also proved.