Multi-carrier non-orthogonal multiple access (MC-NOMA) system has been considered as a promising candidate in future wireless networks. In a MC-NOMA system, the available bandwidth of transmission is divided into several sub-bands, such that multiple users in each sub-band are served based on power-domain NOMA. Unlike the equal sub-band allocations, we propose a sum-rate maximization technique that jointly allocates the available power and bandwidth with opportunistic sharing between the sub-bands. A second-order cone program approach is exploited to deal with the non-convexity issues of the corresponding optimization problem. Simulation results reveal that the MC-NOMA system with opportunistic bandwidth allocation outperforms the scheme with the equal bandwidth allocation in terms of achieved sum-rate.

中文翻译：

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具有机会带宽分配的下行链路多载波 NOMA


多载波非正交多址（MC-NOMA）系统被认为是未来无线网络的有前途的候选者。在MC-NOMA系统中，传输的可用带宽被划分为多个子带，使得基于功率域NOMA为每个子带中的多个用户提供服务。与相等的子带分配不同，我们提出了一种总速率最大化技术，该技术通过子带之间的机会共享来联合分配可用功率和带宽。利用二阶锥规划方法来处理相应优化问题的非凸问题。仿真结果表明，就实现的总速率而言，采用机会带宽分配的MC-NOMA系统优于采用等带宽分配的方案。