发表机构
Hunan Institute of Science and Technology; Laval University; University of Saskatchewan; University of Quebec at Montreal; South-Central Minzu University（湖南理工学院; 拉瓦尔大学; 萨斯喀彻温大学; 蒙特利尔大学; 中南民族大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出NOMA辅助的无线馈电钉扎天线系统，通过联合优化功率与天线位置最小化总功耗，仿真显示相比OMA平均功耗降低约20%。
AI 中文摘要
本文研究了一种非正交多址（NOMA）辅助的多用户无线馈电钉扎天线系统（Wi-PASS）。一个多天线基站（BS）同时服务一个直连用户，并通过无线方式为配备定向喇叭接收器的全双工放大转发中继供电。中继将NOMA波形注入介质波导，一个位置可调的钉扎天线服务另外两个用户。在最大增益迫零传输、理想串行干扰消除和加性残余自干扰模型下，我们通过联合优化基站功率、中继放大因子、NOMA功率分配系数、解码顺序和钉扎天线位置来最小化总消耗功率。对于固定位置和解码顺序，变量变换将资源分配问题简化为严格凸的标量问题，并得到闭式全局解。位置相关的解码顺序将波导划分为有限个区间，优化功率的导数在每个区间上由二次多项式控制。因此，通过评估一个小的有限候选集即可找到全局最优位置。在28 GHz频段对1000个随机用户拓扑的仿真表明，所提出的架构在直接传输、阵列馈电、无PASS和等时正交多址（OMA）基准中始终需要最低的消耗功率。在目标信干噪比为20、25和30 dB时，相对于等时OMA，平均功率分别降低了19.2%、21.1%和21.7%，同时随着基站-中继距离和残余自干扰的增加，其优势得以保持。
英文摘要
This paper investigates a non-orthogonal multiple-access (NOMA)-assisted multi-user wireless-fed pinching-antenna system (Wi-PASS). A multi-antenna base station (BS) simultaneously serves one direct user and wirelessly feeds a full-duplex amplify-and-forward relay equipped with a directional horn receiver. The relay injects the NOMA waveform into a dielectric waveguide, and one position-adjustable pinching antenna serves two additional users. Under maximum-gain zero-forcing transmission, ideal successive interference cancellation, and an additive residual self-interference model, we minimize the total consumed power by jointly optimizing the BS powers, relay amplification factor, NOMA power coefficients, decoding order, and pinching-antenna position. For a fixed position and decoding order, a variable transformation reduces the resource-allocation problem to a strictly convex scalar problem and yields a closed-form global solution. The position-dependent decoding order partitions the waveguide into finitely many intervals, and the derivative of the optimized power is governed by a quadratic polynomial on each interval. Hence, the globally optimal position is found by evaluating a small finite candidate set. Simulations at 28~GHz over 1000 random user topologies show that the proposed architecture consistently requires the lowest consumed power among direct-transmission, array-fed, no-PASS, and equal-time orthogonal multiple-access (OMA) benchmarks. At target signal-to-interference-plus-noise ratios of 20, 25, and 30~dB, it reduces the average power by 19.2%, 21.1%, and 21.7%, respectively, relative to equal-time OMA, while preserving its advantage as the BS-relay distance and residual SI increase.
Commentssubmitted to IEEE journals
