Research On Technology Of Carrier Synchronization For SC-FDMA System In Multi-antenna LTE Uplink

2004, Third Genernation Partnership Project began to study tissue LTE (Long Term Evolution) technology and determine the definition of LTE. In a wireless communication system, the high speed moving objects prone to Doppler effect, which will seriously affect the spectrum of the received signal in the case of fast-moving, especially in the multipath environment, the spectrum of the received signal to produce the structure is different and more Doppler frequency shift caused by Doppler spread thereby. Decline type Doppler effect arising from the time selective fading, which seriously disrupted the orthogonal subcarriers features MIMO SC-FDMA system between inter-carrier interference caused, but also make the original signal not to be restored properly, error bit rate increases, the performance of the system has a great impact. Because of the frequency oscillator between transmitting and receiving ends of inconsistencies caused instability will greatly affect the performance of the system, in the same manner, the frequency difference is also referred to such a carrier frequency deviation. In this paper, the problem of carrier synchronization LTE uplink multi-antenna systems were analyzed.Channel detection scheme for MIMO, need to consider how to make the algorithm complexity as low as possible, to improve the detection performance of the detector Excellent performance of the detector enables multiple-input multiple-output system play to the advantages of high data rates and high gain with itself. Performance of the detector by the simulation, SNR and BER results of a curve, the curve characteristic is judged according to the quality of performance, but also through other reference index of diversity MIMO system such judgment. When the theoretical design to achieve because of the limitations of conventional processing hardware, e.g., signal processing, digital processing chip data much faster than the standard set up, it is of high complexity in the calculation of the algorithm difficult to put to use in practical applications. In the detection of possible scenarios, and can not do in fact have excellent detection performance and low complexity, the two can not have both, are mutually contradictory, so the focus detection program is designed to consider the complexity and detection performance compromise. We want to combine the two aspects in achieving considered together.Carrier frequency for the transmitter and receiver to generate offset the impact on the performance of MIMO SC-FDMA system is proposed based on MMSE-PIC of MIMO SC-FDMA carrier synchronization algorithm. Firstly, the minimum mean square error to estimate the frequency offset, then the carrier frequency offset cancellation algorithm to eliminate interference suppression based on these preliminary estimates using an iterative parallel interference. Through theoretical analysis and simulation experiments to verify the effectiveness of the algorithm, and improves system performance.