Base Station Selection for Per-cell Precoding with Limited Feedback in Cooperative Multi-point Systems

Though per-cell precoding is an efficient coordinated multipoint transmission/reception transmission mode for frequency-division duplex systems, it has the problems of channel feedback and computational complexity. Especially, when base station has large antennas, these problems are worsened. To overcome these drawbacks, we propose a base station selection precoding that searches an optimal combination of cooperative base stations. By selecting transmission mode at each base station, the feedback overhead and complexity can be relieved and user can acquire additional throughput gains. Also, the analytical approximation of proposed scheme is derived. Simulation results show that the base station precoding has a higher throughput gains in the large antennas environment than conventional schemes and the analytical results approximate the numerical results well.