Study of Timing and Frequency Synchronization Schemes in Multi-user MIMO Experimental System

Abstract

Multi-user MIMO system requires precise control of transmit signals in order to suppress inter-user interference. Therefore, precise synchronization of timing and carrier frequency is required between base station and mobile stations. For multi-user MIMO transmission experiments, this paper presents timing and frequency synchronization schemes based on received signals in each mobile stations. The performance of these schemes is evaluated by the computer simulation. In-lab transmission experiments are carried out using a fading emulator and the BER performance using these schemes is compared with the performance using GPS signals.