Research On The Key Technologies And The Implementation Of The Adaptive Transmission Of Boardband Trunking Communication

Broad Band trunking communication(B-TrunC)system is based on a time division long term evolution(TD-LTE)broadBand private network trunking communication system standard developed by the broadBand industry clusters Alliance.In recent years,the field of private network communications has been widely studied and applied.This thesis studies the Adaptive Modulation and Coding(AMC)technology of B-TrunC system,and the channel quality parameters required for AMC are studied.This thesis studies the transmission principle and key technology of the feedBack channel and the Physical Uplink Control Channel(PUCCH)of channel quality parameters.In this thesis,the downlink adaptive transmission technology and the physical uplink control channel based on the channel quality indication are studied on the multi-core DSP chip of TMSC6670.Firstly,this thesis studies the downlink adaptive modulation and coding technique,analyzes the AMC scheduling process and the typical channel control parameters,This thesis designs the AMC implementation process,simulates the downlink adaptive modulation and coding process on Matlab,verifies the feasibility of the design based on the fixed threshold algorithm,and provides the performance reference for the DSP-based fixed point implementation.Aiming at the adaptive transmission mechanism of B-TrunC system,this thesis studies the measurement techniques of typical channel quality parameters: Signal to Interference plus Noise Ratio(SINR)and Rank indication(RI).In this thesis,a variety of typical SINR measurement algorithms are studied,including SINR measurements based on null subcarriers,Cyclic Prefix(CP)correlation,frequency domain equalization data,and pilot,finally based on the algorithm performance and implementation complexity analysis,SINR measurement based on cyclic prefix correlation and null subcarrier are studied.This thesis studies the typical measurement algorithm of RI: based on the measurement of the number of channel matrix conditions and maximizing the system capacity,and realizes the technology research based on the measurement of channel condition according to the performance and implementation complexity.In this thesis,the B-TrunC system-level link simulation platform is built with Matlab,and the performance of the typical parameters is simulated.This thesis organizes the overall structure and information format of PUCCH and gives the design of PUCCH transmission scheme.It studies the realization of PUCCH on TM320C6670 multi-core DSP platform.Based on the PUCCH transmission function,the task module division and software design flow of the transmitter and receiver are given.In this thesis,the channel estimation algorithm is selected according to the complexity of the algorithm.The performance difference of key module between fixed-point implement and the float-point simulation link is analyzed.The thesis also makes the statistics and analysis of the software implementation complexity.The performance of PUCCH link based on channel simulator is analyzed,and the fixed performance of Gaussian channel is analyzed.Compared with the floating point simulation results of Matlab,the correctness and reliability of the link are verified.In this thesis,the Serial Rapid I/O(SRIO)used in the B-TrunC test system is studied.The system specification and programming mechanism of SRIO interface are analyzed,and the interface design of B-TrunC test system is carried out.In this thesis,the downlink adaptive implementation process based on channel quality indication is designed.On this basis,the downlink adaptive process is realized and verified on the multi-core DSP platform.This thesis compare the system with AMC before and after the channel simulator to verify that the adaptive technology based on the channel quality instruction will improve the throughput of the system.