在能量受限的中继系统中,无线携能通信技术是一种有效地延长其使用寿命的方法.本文研究具有大规模天线阵列结构的正交频分复用(OFDM)解码转发中继系统的无线携能通信,其发送端配备了大规模天线阵列.传输过程分为3个时隙,在第一个时隙,发送端运用基于最大比传输的波束成形向中继传输能量;在第二个时隙,发送端向中继发送信息;在第三个时隙,中继使用之前收获的能量向接收端转发信息.讨论了信息和能量传输的功率在各子载波间的分配以及3个时隙的时长分配问题,提出了一种最大化传输信息速率的时间和功率联合分配最优算法.仿真结果表明,该算法明显优于已有功率和时间分配算法.%Simultaneous wireless information and power transfer (SWIPT) is an effective way to prolong the operation time of energy-constrained wireless relay systems. A large-scale antenna array based SWIPT orthogonal frequency division multiplexing (OFDM) decode and forward (DF) relay system, in which the source is equipped with large-scale antenna array, is considered. The transmission process is divided into three time-slots. In the first time-slot, the source transmits power to the relay using maximum ratio transmission beamforming; in the second time-slot, the source transmits information to the relay; in the third time-slots, the relay transmits the information to the destination using the harvested energy in the first time-slot. Both the power allocation (PA) over the sub-carriers for information and power transmissions from the source to the relay and from the relay to the destination, and the time allocation (TA) between the first, second and third time-slots are investigated. An optimal joint PA and TA algorithm has been proposed. Computer simulation results shows that the proposed algorithm outperforms some benchmark schemes.
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