全双工大规模MIMO网络中最优天线分配

Optimal Antenna Allocation in Full-Duplex Massive MIMO Systems

在全双工大规模MIMO网络中,为了降低自干扰,提升频谱效率,提出了一种最优天线分配算法。该算法在基站采用迫零线性信号处理和存在信道估计误差的前提下,首先推导出系统和速率的紧下界。通过分析该下界,以系统和速率最大化为优化目标,得到最优的收发天线比。理论分析和仿真结果表明:1)收发天线比与上行导频信号发射功率成正比,与下行导频信号发射功率成反比;2)当天线数目无穷大时,最优天线比趋近于1。

In order to suppress the self-interference and improve spectrum efficiency in full duplex massive multiple input multiple output(MIMO)network,an optimal antenna allocation algorithm is proposed.In the full duplex system,the base station exploits zero-forcing linear processing and therefor has imperfect channel estimation.A tight lower bound on the sum-rate for the system with large number of antennas is derived.By resorting to the tight lower bound,a sum-rate maximization problem in terms of antenna ratio is formulated.The analysis and simulation results show that,1)the ratio of receive antennas and transmit antennas is proportional to the training power of uplink,while it is inverse proportional to the training power of downlink;2)the optimal antenna ratio converges to 1,when the total number of antenna goes to infinity.