LTE-A Physical Layer PUSCH Baseband Receiver System Algorithm Simulation And Fixed-point Design

The 3GPP has completed the LTE-Advanced transmission protocol standard-setting works Release10.Because PUSCH is the only channel which provide data service in all the uplink channels, it has an important role in the LTE-A physical layer.Therefore, design of LTE-A suitable physical layer PUSCH channel receiver baseband algorithm becomes current needs.The begin of the second chapter introduces the key technologies such as OFDM and MIMO combined with the emission standard which describes the process of physical layer transmitter.then analyzes the design of demodulation reference signal(DMRS), layer mapping and precoding,which are the basis for the design of receiver algorithms.The third chapter systematically analyzes the overall process of the PUSCH channel receiver baseband algorithms.Do detailed analysis to the key technology, especially on the channel estimation, MIMO detection, noise estimation and frequency offset estimating section.In the channel estimation we select a method based on DFT transform temporal filtering methods which combined with DMRS to estimate the channel coefficients.Then the chapter analyzes several classical MIMO detection algorithms such as ML, ZF, MMSE, and uses the Matlab to simulate the performance of the appropriate algorithm. From the simulation results we know that, MMSE is superior to ZF in performance which matches the theoretical analysis conclusion.Second, in process of the noise estimated uses a DFT-based transform domain filtering algorithm.Then the chapter analyzes the reasons for the receiver frequency offset, and selects a method which is based on the pilot data to estimate the frequency offset and then compensates it.The fourth chapter combines with the TD-LTE-Advanced terminal physical layer baseband transmitter and receiver algorithms verification platform tester which is coming from the National Science and Technology Major Project "TD-LTE-Advanced Comprehensive Test Instrument development" and analyzes the implementation of the fixed-point arithmetic designs.It elaborates on the core of the design process of MIMO Detection Algorithm,then analyzes the performance of the receiving system, the error rate at the receiving end.The simulation results show that the fixed-point algorithm has performance loss due to the shift in performance, truncation and other operating, but they are in the affordable range.