An Innovative Pulse-shaping Scheme Using Multiwavelets for Non-orthogonal Multiple-Access

A novel pulse-shaping scheme using multiwavelets (MWs) for the non-orthogonal multiple-access (NOMA) communication systems is proposed in this letter. Different from the conventional pulse-shaping schemes, this work exploits multiwavelets for constructing pulse-shaping filters so different users’ information can be multiplexed using the power diversity within the same frequency band. Hence, all users’ transmitted signals can be combined through the superposition by various power-allocation coefficients. At the proposed MW-NOMA receiver, after the successive interference cancellation (SIC) is carried out, the corresponding MW matched filters (shaping pulses) will be invoked to extract each individual user’s transmitted signal. A link-level performance evaluation of the proposed new NOMA scheme is also conducted in this letter. The simulation results demonstrate that our proposed new NOMA technique can significantly improve the system capacity and the bit error rate (BER) performance over the conventional NOMA scheme. When the power-allocation ratio is set to 0.4:0.6 in the proposed NOMA system for two users, the remarkable transmitting $E_{ \text {b}}/\mathcal {N}_{0}$ gain of 15 dB can be achieved by both users.