Non-orthogonal multiple access (NOMA)-based diamond relaying (NDR) is an efficient approach for combining NOMA and relaying techniques in such a way as to enhance the achievable rate from the source to the destination in the network. This paper examines the problem of joint power allocation among all the transmission phases during the operation of such networks. Based on the Karush-Kuhn-Tucker (KKT) condition and the second-order sufficient condition (SOSC), at least the local optimal solution is derived and analyzed. In addition, a new protocol for NDR networks based on cooperative communications is introduced and the associated joint power-allocation problem is examined. It is shown that this cooperative NDR (C-NDR) network further improves the achievable rate in some typical placements of the relays. Simulation results verify the correctness of the deviation and confirm the effectiveness of the proposed joint power-allocation method for both NDR and C-NDR networks.

中文翻译：

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带有和不带有协作的基于NOMA的钻石中继网络的联合功率分配

基于非正交多路访问（NOMA）的钻石中继（NDR）是一种有效的方法，可以将NOMA和中继技术结合起来，从而提高网络中从源到目的地的可实现速率。本文研究了在此类网络运行期间所有传输阶段之间的联合功率分配问题。基于Karush-Kuhn-Tucker（KKT）条件和二阶充分条件（SOSC），至少可以导出和分析局部最优解。此外，引入了一种基于协作通信的NDR网络新协议，并研究了相关的联合功率分配问题。结果表明，该协作NDR（C-NDR）网络在某些典型的中继位置中进一步提高了可达到的速率。