Receive diversity impact on UE RF characteristics in LTE system

In order to achieve high data rate, Multiple-Input Multiple-Output (MIMO) technology is applied to 3GPP long term evolution (LTE) system with multiple antennas deployed in a LTE user equipment (UE), accordingly a dual-port test method is introduced in the LTE radio frequency (RF) conformance testing for UE, in which a receive diversity gain may be obtained in certain conditions. In this paper, the impact of receive diversity on two typical UE receiver RF characteristics i.e. reference sensitivity level and adjacent channel selectivity (ACS) is investigated, on that basis the modifications of the test parameters are proposed in order to guarantee the validity of the test results. Finally, the simulation results indicate that the inferences about the receive diversity and the analyses of test parameters modification are both reasonable.