Abstract:To suppress the Co-Channel Interference(CCI) and increase the number of served users in multi-user distributed Multiple Input Multiple Output(MIMO) systems, a joint transmit antenna selection and pre-coding scheme is proposed based on the characteristics that there are a large amount of antennas at the base station in distributed MIMO systems. In the proposed scheme, downlink transmits antenna selection and Signal to Leakage and Noise Ratio(SLNR) pre-coding are combined together. On the one hand, it selects different antennas for each user to radically decrease the CCI. On the other hand, during the antenna selection process, antenna ports are firstly selected according to the trace of the channel sub-matrices. Then antennas which minimize the SLNR loss for each user are selected with an elimination method in order to make interference to other users as small as possible and further suppress the CCI. Compared with the optimal algorithm, the proposed algorithm shows great superiority on complexity with a capacity performance similar to the optimal algorithm. It can make the system provide service to more users than SLNR pre-coding under the same capacity constraint.