Full-Duplex Cooperative Non-Orthogonal Multiple Access System With Feasible Successive Interference Cancellation
Full-Duplex Cooperative Non-Orthogonal Multiple Access System With Feasible Successive Interference Cancellation
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DOI：
10.1109/vtc2020-spring48590.2020.9129033
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
Turki E. A. Alharbi;Kevin Z. Shen;D. So
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文献类型：
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作者：
Turki E. A. Alharbi;Kevin Z. Shen;D. So
非正交多址(NOMA)由于频谱利用率高，是未来移动网络的一种很有前途的无线接入方案，但由于干扰和信道质量差，弱用户的性能较差。全双工协作NOMA(FD C-NOMA)是一种很有吸引力的解决方案，它允许强用户同时中继弱用户的信号，但现有的工作大多假设来自基站(BS)和强用户的信号可以在弱用户处完美地分解和合并。考虑到可行的连续干扰消除(SIC)操作，我们提出了一种两相FDC-NOMA系统，其中BS在第二阶段只为强用户发送新的信号，使得弱用户可以执行SIC来获得自己的信号。研究了该系统的和速率最大化问题，并在总BS发射功率和比例速率约束下，得到了一个低复杂度的闭合解。数值仿真结果表明，与其他方案相比，本文提出的FDC-NOMA系统模型具有更好的和速率性能。
Non-orthogonal multiple access (NOMA) is a promising radio access scheme for future mobile networks due to its high spectral efficiency, but the weak user suffers poor performance due to the interference and poor channel quality. Full-duplex cooperative NOMA (FD C-NOMA) is an attractive solution by allowing the strong user to relay the weak user’s signal simultaneously, but most existing works made an impractical assumption that the signals from the base station (BS) and the strong user can be perfectly resolved and combined at the weak user. Considering feasible successive interference cancellation (SIC) operation, we propose a two-phase FD C-NOMA system where the BS only transmits a new signal for the strong user in the second phase, such that the weak user can perform SIC to obtain its own signal. A sum-rate maximization for this proposed system is investigated and a low-complexity closed form solution is derived under the total BS transmission power and proportional rate constraints. Numerical simulation results show that the proposed FD C-NOMA system model attains better sum-rate performance compared to other schemes.