Comp-jt with Dynamic Cell Selection, Global Precoding Matrix and Irc Receiver for Lte-a

Coordinated multi-point transmission and reception (CoMP) is introduced in LTE-A to mitigate co-channel interference and improve the cell-edge user experience. In this paper we propose a joint transmission scheme for LTE-CoMP and we enhance the performance of CoMP with two techniques: 1dynamic MIMO cell selection and 2closed loop MIMO with global precoding matrix selection. A cell-edge user selects the base stations that jointly transmit the desired signal from the available ones (we assumed 3). The user also selects the closed loop precoding matrices for MIMO in a joint fashion to fit the independent MIMO channels from two base stations (eNBs). In addition, edge users are likely to be subject to severe Cochannel interference from eNBs outside the joint transmission set.To address co-channel interference from the base station(s) that are not included in CoMP joint transmission set, the user equipment employs Minimum Mean Squared Error receiver with Interference Rejection Combining (MMSE-IRC). We illustrate the effect of fading correlation between elements of the transmit and receive antennas. Also, the effect of the desired to interference eNB power ratio in case of medium correlation for 3 and 4 layers using MMSEIRC receiver is studied. Also we compare the BER performance for 3 and 4 layers in case of different values of the desired to interference eNB power ratio. Simulation results show that the performance of CoMP with cell selection considerably improves the performance. Also, global selection of the precoding matrices outperforms local selection. In addition, using MMSE-IRC gives much better performance than the conventional minimum mean square error (MMSE) in the presence of co-channel interference.