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Wireless Powered Cooperative Non-Orthogonal Multiple Access Transmission

机译:无线动力协作非正交多址传输

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This paper considers a three-stage multiple-input single-output (MISO) downlink system with wireless powered cooperative non-orthogonal multiple access (NOMA) transmission. In the first stage, a transmitter and a user with the best-of-the-effort quality-of-service (QoS) requirement activate a passive user by wireless power transfer (WPT) via radio frequency (RF) signal. In the second stage, the information is sent to both users with NOMA scheme. Finally, the best- of-the-effort user forwards the information to the passive user with decode-and-forward (DF) protocol in the third stage. By jointly optimizing the time fraction of each stage, the transmitter's beamforming vectors and the user's forwarding power, the data rate of the best- of-the-effort user is maximized while satisfying the minimum signal-to-interference-plus- noise ratio (SINR) and data transmission requirement of the passive user. Analytic solutions of the time fraction and forwarding power are derived, while the beamforming vectors can be obtained either in closed-form, or by solving a semidefinite programming (SDP) problem. The numerical results validate the proposed algorithm, and the significant impact over the system performance due to the nonlinear energy harvesting model is also verified.
机译:本文考虑了一种三级多输入单输出(MISO)下行链路系统,具有无线动力协作非正交多址(NOMA)传输。在第一阶段,发射器和具有最佳服务质量(QoS)要求的用户通过射频(RF)信号通过无线电力传输(WPT)激活无源用户。在第二阶段,信息被发送给具有NOMA方案的两个用户。最后,最佳用户将信息转发到被动用户的数据向前推进(DF)协议在第三阶段中。通过共同优化每个阶段的时间分数,发射器的波束成形向量和用户的转发功率,最佳努力用户的数据速率最大化,同时满足最小信令到干扰率( SINR)和被动用户的数据传输要求。推导出时间分数和转发功率的分析解,而波束形成载体可以以闭合形式获得,或通过求解半纤维编程(SDP)问题。数值结果验证了所提出的算法,并且还验证了由于非线性能量收集模型引起的系统性能的显着影响。

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