Optimal Resource Allocation for NOMA Wireless Networks

The non-orthogonal multiple access (NOMA) method is a novel technique that aims to increase spectral efficiency (SE) and accommodate enormous user accesses. Multi-user signals are superimposed transmitted in the power domain at transmitting end by actively implementing controllable interference information, multi-user detection algorithms, such as successive cancellation (SIC), performed receiving demodulate necessary signals. Although its basic signal waveform, like LTE baseline, could be based on orthogonal frequency division (OFDMA) or discrete Fourier transform (DFT)-spread OFDM, NOMA superimposes numerous users domain. In contrast transmission method, can achieve higher spectrum utilization. However, it will complexity of receiver. Different allocation techniques have direct impact system’s throughput. As result, order boost system capacity, an efficient mechanism must investigated. This research developed conjugate gradient solve problem downlink distribution. major goal maximize users’ maximum weighted sum rate. suggested algorithm’s most notable feature converges global optimal solution. When compared existing methods, simulation results reveal has better capability.