A new modulation scheme using multiwavelets for downlink non-orthogonal multiple-access (NOMA) transceivers is presented in this work. Multiwavelets leading to remarkable spectral diversity are exploited to modulate/demodulate the superimposed multi-user signals in downlink NOMA systems, where the discrete multiwavelet transform and the inverse discrete multiwavelet transform are invoked in the new demodulator of the user equipment and the new modulator of the base station, respectively. The performance evaluation and the computational-complexity analysis of our proposed new NOMA scheme are also conducted. Simulation results demonstrate that the proposed new scheme can significantly increase the system capacity while dramatically suppressing the peak-to-average-power ratio (PAPR) compared to the conventional OFDM-based NOMA approach. Meanwhile, our new scheme can achieve the same system capacity as the scalar-wavelet-based NOMA approach but with a lower PAPR at little extra cost of computational-complexity. All of these three aforementioned NOMA schemes can result in the identical bit-error-rate under the same signal-to-noise ratio condition.

中文翻译：

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用于下行链路 NOMA 系统的新型高效多小波调制

在这项工作中提出了一种使用多小波进行下行链路非正交多址 (NOMA) 收发器的新调制方案。利用导致显着频谱分集的多小波调制/解调下行链路 NOMA 系统中叠加的多用户信号，其中在用户设备的新解调器和新调制器中调用离散多小波变换和逆离散多小波变换。基站，分别。还进行了我们提出的新 NOMA 方案的性能评估和计算复杂性分析。仿真结果表明，与传统的基于 OFDM 的 NOMA 方法相比，所提出的新方案可以显着提高系统容量，同时显着抑制峰均功率比 (PAPR)。同时，我们的新方案可以实现与基于标量小波的 NOMA 方法相同的系统容量，但具有较低的 PAPR，而计算复杂性的额外成本很小。在相同的信噪比条件下，上述三种 NOMA 方案都可以导致相同的误码率。