Research On The Key Technologies And The Implementation Of TD-LTE System Multi-user Physical Uplink Shared Channel

This thesis studies the key technologies of the implementation of TD-LTE Physical Uplink Shared Channel(PUSCH). Based on TMS320C6670 Multi-Core DSP chip, the function of multi-user PUSCH is verified. Meanwhile, the thesis tests the transmission performance of PUSCH based on channel simulator.The thesis extracts the sub-function modules of PUSCH based on TD-LTE Release 8 Physical layer standard protocol, selects the key algorithms and completes the design of transmission scheme of PUSCH; The thesis constructs the link-level float simulation link of PUSCH, and compares the output of simulation transmitter with standard output data of third-party. As results, the simulation link is verified; The thesis analyzes the performance of multi-user receiver in Gauss channel, on one hand it verifies the feasibility of algorithm selection, on the other hand it offers the reference for resource assessment of DSP software implementation and algorithm performance.The thesis analyzes hardware implementation platform based on TMS320C6670 Multi-Core DSP chip, emphatically discusses the structure and feature of multi-level cache, and studies the implementation patterns of cache coherency; The thesis analyzes the utilization of the Bit Coprocessor(BCP) and Fast Fourier Transform Coprocessor(FFTC) which are based on Navigator; Conbined with LTE system, the thesis designs the typical coding and decoding utilization scenarios based on BCP and Fourier transform and pre-coding based on FFTC;In typical parameter configuration, the thesis verifies the function and analyzes performance of BCP and FFTC in the point of complexity and output accuracy.The thesis deeply studies the implementation of Up-Link multi-user PUSCH based on TMS320C6670 multi-core DSP chip. The thesis evaluates the detailed resource, provides the software design procedure and task modulus division of the transmitter and receiver. According to LTE protocol the thesis designs the processing procedure of TD-LTE Up-link PUSCH, including transmitter:the processing procedure of bit stream and modulation based on BCP、SC-FDMA modulation based on FFTC、UEs’ parameter updating、the generation of reference signal、resource mapping、frequency offset and framing;and receiver: SC-FDMA demodulation based on FFTC、channel estimating based on filtering noise in transform domain 、 zero-forcing equalization and multi-antenna maximal ratio combining、demodulation、descramble and de-matching based on BCP、channel decoding and CRC checking based on TCP3 D and resource de-mapping、generation of local reference signal etc. The thesis designs scaling compensation scheme for FFTC’s dynamic processing, analyzes the comparison and analysis between fixed-point implementation and float-point simulation; The thesis also analyzes the complexity of software implementation;The thesis designs parameter interface and working sequential among PHY、MAC and RF unit for Up-Link multi-user PUSCH, and accomplishes the testing of the Up-Link system. Based on channel simulator, the thesis tests the transmission performance of PUSCH in Gauss channel, verifies the feasibility and reliability of implementation scheme proposed in this thesis.