Abstract: The time delay parameter can not be accurately estimated in Long-term Evolution(LTE) system because of the multipath fading and the non-line-of-sight in urban canyons and indoor environments. In response to these issues, an algorithm of time delay estimation that is based on Multiple-input Multiple-output(MIMO) in LTE system is proposed. It uses the primary synchronization signal which has a good autocorrelation characteristic as the reference signal. Then, in order to reduce the error rate in the signal transmission process, the technique of transmitter diversity and Maximum Ratio Combining(MRC) are utilized to obtain the maximum SNR received signal. The operation of cross-correlation between the received signal and reference signal is processed to obtain the time delay estimation. Simulation results show that the time delay estimation in proposed algorithm is improved by about 5 sampling interval compared with the reference algorithm in the error of cumulative distribution probability of 90%.
Long-term Evolution(LTE) system,
time delay estimation,
Maximal Ratio Combining(MRC)