Reseach&Implementation Of Fast Algorithm In Lte Physical Layer Pdsch Encoding

With the rapid development of TD-LTE technology, the gradual improvement of TD-LTE terminals and the commercialization of TD-LTE terminals, TD-LTE terminal test instruments can’t meet the development of TD-LTE terminals. Developing full-featured and stable test instruments for TD-LTE terminals has become an urgent need to promote the TD-LTE terminals to the market.In order to solve the problem that TD-LTE terminal test instruments can’t reach the theoretical downlink peak rate, firstly, the hardware and software architecture of TD-LTE terminal test instruments, the optimization method of C and linear assembly language based on TMS320C6474are analyzed; secondly, algorithm principle of CRC coding module, Turbo coding module, Rate matching coding module, Scrambling coding module and Modulation coding module contained in the PDSCH channel processing procedure in TD-LTE are researched. According to the inadequate implemented of each module, fast algorithm based on DSP is proposed and implemented. Finally, the comparison of performance before and after optimization verifies the correctness and feasibility of the fast algorithm.The achievement of the research has been successfully applied to TD-LTE terminal test instruments reaching the downlink peak rate. This further confirmes the feasibility of the fast algorithm. Moreover, the research lays a solid foundation for further development of TD-LTE terminal test instruments.