Research On LTE-A Inter-Cell Interference Suppression

As the requirement of user improving, wireless communication is developing rapidly. LTE-A has been the core technology of next generation mobile communication with its advantages of high data rate,high mobility,high system capacity and large coverage.While as lacking of the wireless spectrum resource, we should improve the usage of spectrum.LTE-A employ Orthogonal Frequency Multiplex Access which can avoid intra-cell interference,but the inter-cell interference is so severe that the performance especially for the cell edge users is very poor.Multi-antenna can improve the rate of space multiplexing,relay can improve the coverage and CoMP can suppress the inter-cell interference.In this paper,we research in inter-cell interference,firstly,introduce the background of LTE-A system inter-cell interference,then we introduce the circumstances with combination of CoMP and Relay, and employ two slots transmission scheme, base stations share one relay in the cell edge area. In the first slot,base stations transmit data simultaneously,user equipments and relay receive data, in the second slot,relay process and forward data and user equipments receive data.User combine the mixed data with maximum rate combination and detect the desired data.We design the optimal function,and propose the scheme of reciever detection and transmitter precoding matrix in case of multi-antenna.In single antenna scene,we employ three relays of amplify and forward,detection and forward and detection modulation and forward and maximum likehood method to detect the received data.In multi-antenna scene,we employ two relays of amplify and forward and detection and forward. From the property of received data,we design the optimal function to solve the precoding matrix.For AF Relay, the relay amplification matrix is predetermined so that the interference relay channel is converted to the conventional MIMO interference channel. For DF Relay, we search the probable solutions to design the precoding matrix.We set up the simulation platform,simulate the performance of proposed scheme and compare with traditional ones,analyze the result.Finally we verify the proposed scheme can improve the performance of cell-edge user obviously.