Research and Link Simulation of Key Technologies for LTE Downlink

To meet the evolution goals such as high peak rates, larger system capacity. LTE downlink adopts MIMO- OFDM technology. In this paper, we focus on channel estimation, which is one of the core technologies of the LTE downlink. First we establish the system framework .On this basis, we implement the channel estimation with two transmitting antennas and two receiving antennas. LS (Least Square) and LMMSE (Linear Minimum Mean Squared Error) estimation results are compared in the paper. And the results have shown that the algorithms have nice performance without channel coding in the physical downlink. In addition, interpolating methods are shown for the system to get the full-scale channel impulse response.