LTE Downlink Shared Channl Modeling And Simulation Analysis

With the fourth generation mobile communication (4G) system in the global deployment of pace accelerate, the government, industry and academia keep great attention on LTE and LTE advance mobile technology system,which prompting the standard matures, increasingly in-depth application and has truly become the global 4G standard in mobile communication, will be in 5G stage continue to evolve. For the 5G mobile communication technology to meet the needs of people with ultra-high flow, high connection density, high mobility challenges and new heterogeneous network integration architecture. The advanced wireless communication signal processing technology have been produced. Global, intelligent, virtualization, to calculate the core level based on sharing the new centralized network architecture the decoupling of the entire system of distributed optical fiber pull far unit (RRH), redefine the multi-mode baseband pool, multi protocol processing pool, global resource management control pool 4 layer processing unit, which can be redefined the multi-mode baseband pool ideas and technology research is in full swing development, simulation and verification of the experimental system is redoubling its efforts to.Computer simulation of mobile communication system has become one theoretical research, experimental studies of the three means, through simulating the real environment and conditions to verify the technical details and evaluate system performance and optimization of the operation of the network, and significantly reduce the new technology research and development costs and shorten the development cycle. According to the hierarchical structure and the scale of the size of the system, the simulation of communication system is divided into system level simulation and link level simulation. This work is in the "new baseband pool access network architecture validation system validation project, link level simulation of LTE downlink shared channel. Firstly, the LTE physical layer protocol and the composition of the physical channel are summarized, and the information transfer process of the downlink shared channel is introduced. Then, the top-down design method of layer by layer and the system simulation model was set up, respectively designs the transmitter from the top end, channel and receiver model, and modems, Codecs, MIMO, OFDM, fading channel, downlink shared channel processing of the underlying model, and implemented by MATLAB programming. Finally, using the simulation platform, by setting the transmission mode, bandwidth, signal-to-noise ratio, number of antennas and modulator type, bit rate and other parameters reflect different test scenarios, the effect of transmission mode and channel estimation algorithm, BER and SNR relationship, MIMO receiving algorithm performance analysis and evaluation. Lay the foundation through the physical process and the key algorithms for LTE downlink shared channel model and simulation analysis for the redefinition of the baseband verification.