Accuracy of maximum likelihood estimation for narrowband MIMO channel

Maximum likelihood estimation (MLE) method was applied to the narrowband multiple input and multiple output (MIMO) channel matrix. Code synchronization and MLE were full-scale derived as well. One MIMO simulating platform was set up based on the channel measurement simulating system in Matlab/Simulink, based on which the relevant measurement results were provided. According to the accuracy of MLE, the error analysis results of the channel measurement showed that the error of code synchronization, limited by the hardware sampling rate, decides the precision estimation of channel conditions; the intermediate frequency recovery must be restricted to guarantee the precision estimation of phase; code synchronization, rather than signal to interference plus noise ratio (SINR), mainly decides the estimation of channel conditions when the SINR is sufficiently high.