Research And Implementation Of Physical Uplink Shared Channel Based On Time Division Duplexing Long Term Evolution

Compared with traditional communication technologies,long-term evolution technologies have many advantages such as high speed,large bandwidth,low latency.This article mainly studies the transmission principles and key technologies of physical uplink shared channel.Based on the Time-Division Duplex Long-Term Evolution(TDD-LTE)protocol,this paper deeply studies the transmission principles and key technologies of Physical Uplink Shared Channel(PUSCH),which support different frequency hopping modes and multiple control information.This paper analyzes the basic principles of PUSCH;builds a floating-point MATLAB simulation,and completes the fixed-point implementation based on TMS320C6670.This paper verifies the consistency between the transmitter processing and the protocol by comparing with standard data,and verifies the correction of the receiver processing by analyzing the performance of the AWGN channel.First of all,this dissertation studies the key technologies of bit-level and symbol-level information processing in the transmitter and receiver based on a dedicated digital signal processor.This thesis deeply studies the transmission principles and key technologies of the physical uplink shared channel,which support different frequency hopping modes and multiple control information.The working principle and calling method of Bit CoProcessor(BCP),Fast Fourier Transform Coprocessor(FFTC)and Turbo Decoder(Turbo Decoder Coprocessor 3,TCP3D)are analyzed.The complex user data processing in is achieved by invoking the coprocessor to work together.This dissertation studies the effect of Type 1 and Type 2 frequency hopping on the performance of the system,and compares the fixed point implementation and floating-point simulation based on the dedicated digital signal processor to verify the correct fixed-point implementation of the two frequency hopping techniques.This paper studies the channel estimation techniques suitable for uplink service shared channels such as Least Square(LS)and Linear Minimum Mean Square Error(LMMSE).Otherwise,this paper studies the fixed-point implementation technology of low-complexity LMMSE channel estimation.By comparing the performance curves under different parameters,the relationship between the size of the low-complexity LMMSE and the performance is analyzed.The test verifies the correctness of the fixed-point implementation.Finally,the thesis summarizes the research results of the full text,analyzes the performance of the whole LTE system,and proposes further improveme nt and research directions for PUSCH.