Research And Implementation Of Broadband Wireless Multimedia Cluster Uplink Data Sharing Channel

This thesis mainly studies the link structure,transmission principle and the key technology of Boardband Trunking Communication(B-TrunC)Physical Uplink Shared Channel(PUSCH).Based on TMS320C6670 multi-core DSP chip,the function of the uplink PUSCH transceiver is completed and verified,as well as the intermodulation function between MAC and RF unit.The thesis is based on the channel simulator for testing and verification of the link transmission performance.Fist of all,this thesis describes the process of global wireless private network to broadband evolution and the development of B-TrunC standard.The relationship between B-TrunC physical layer and TD-LTE is analyzed and the link processing flow and sub-modules of multi-user PUSCH channel are studied.The thesis uses MATLAB to build PUSCH simulation link,and compares the third-party standard data in order to verify the correctness of the link algorithm.The performance simulation curves of multiuser PUSCH receivers under Gaussian channel are given and analyzed under different modulation and bit rate combinations.This thesis studies the realization of PUSCH transceiver based on TMS320C6670 multi-core DSP,which mainly covers Bit CoProcessor(BCP),Fast Fourier Transform Coprocessor(FFTC)and Turbo Decoder(Turbo Decoder Coprocessor 3,TCP3D).Studies include the implementation process and the performance evaluation of the link function modules.The thesis deeply studies the multi-core resource allocation of the receiver.The parallel processing of the single subframe partial decoding module is realized by calling the FFTC at the same time to achieve the superior effect of multi-sub-frame decoding.This thesis analyzes and statisticals the complexity of PUSCH transceiver software based on 20 MHz bandwidth full load scene.The uplink system functions including flexible bandwidth switching and flexible allocation of uplink and downlink resources are improved and verified.This thesis studies the design and implementation process of PUSCH control information based on TMS320C6670 DSP platform,which includes the coding,decoding of control information,the process of multiplexing,interleaving and demultiplexing with PUSCH service data.CQI information uses Hadamard Transform(FHT)decoding algorithm is deeply studied in detail,which compared with the traditional maximum likelihood algorithm from the spatial resource occupancy and decoding performance;This thesis implements the PUSCH control information transceiver,meanwhile analyzes and statisticals the complexity of the transmission link.Based on the Gaussian channel of MATLAB and channel simulator,the performance simulation curve of the floating point and the fixed point transmission link is given and the correctness of the fixed point realization scheme is verified.Based on the protocol,the thesis studies the timing design and implementation scheme of the PUSCH experimental prototype,which accomplishes working sequential among the dispatching layer and the radio frequency.This thesis completes the system performance test of the uplink multiuser PUSCH experimental link.Based on the MATLAB channel,the performance simulation curve is given to verify the link performance of the DSP fixed-point processing.Then through the channel simulator which provides a variety of TD-LTE dedicated channel model to test the performance of the DSP link in the actual scene.Further verify the accuracy,stability and practicality of the uplink implementation solution provided by this paper.Finally,the thesis summarizes the whole research results,and puts forward the direction of further improvement and research for the PUSCH link.