能量有效的NOMA多用户-多信道匹配算法

针对非理想信道状态信息(channel state information, CSI)下面向海量用户的无线资源高效分配难题,通过引入非正交多址(non-orthogonal multiple access, NOMA)技术提出了一种能量有效的多用户-多信道匹配方案。首先,考虑用户中断概率约束,建立以最大化系统能量效率为目标的非理想CSI蜂窝下行NOMA系统信道和功率联合分配优化问题;然后,将建立的含概率约束的优化问题转化为非概率约束优化问题,并从中解耦出用户-信道匹配优化问题;最后,将面向能量效率的NOMA用户-信道匹配优化问题映射为婚姻匹配问题,进而提出一种高效低复杂度的双边匹配算法实现了多用户-多信道的动态匹配。仿真结果表明,提出的匹配算法性能优于传统匹配算法,能够提供更高的系统能效、实现更低的用户中断概率且收敛速度更快。

Energy-efficient multiuser-multichannel matching algorithm in NOMA systems

Aiming at the challenges of efficiently allocating the wireless resources to mass users under imperfect channel state information (CSI), an energy-efficient multiuser-multichannel matching algorithm involv-ing the non-orthogonal multiple access (NOMA) technology is proposed. Considering the constraint of the user outage probability, a joint channel and power allocation optimization problem for cellular downlink NOMA system with imperfect CSI is formulated to maximize the system energy efficiency (EE). The established optimization problem with a probability constraint is transformed into a non-probability constrained optimization problem, from which the user-channel matching optimization problem is decoupled. The EE oriented user-channel matching optimization problem for NOMA system is mapped to the marriage matching problem, and an efficient and low complexity bilateral matching algorithm is thus proposed to realize the multiuser-multichannel dynamic matching. The simulation results show that the proposed matching algorithm achieves better performances than the traditional matching algorithms, which can achieve higher system EE, lower user outage probability and faster convergence speed.