On The Selection of Power Allocation Strategy in Power Domain Non‐Orthogonal Multiple Access (PD‐NOMA) for 6G and Beyond

Abstract

Non-orthogonal multiple access (NOMA) is an attractive candidate for 6G networks to support ultra-massive machine-type communications (umMTC). Power domain NOMA (PD-NOMA) is the simplest type of NOMA, which assigns a different power level to each user. Power allocation in PD-NOMA can be classified into fixed/dynamic power allocation (FPA/DPA). FPA is simple, but DPA is more suitable for the mobile environment than FPA. However, finding optimum power per each user in DPA is extremely complex. Fortunately, many DPA strategic design methods were introduced in literature as simple suboptimal solutions of DPA. Therefore, DPA strategic design methods and FPA techniques are simple approaches to implement PD-NOMA in 6G and beyond. In literature, no previous work had compared the performances of all DPA strategic design methods, nor FPA techniques, to ease the selection of a simple strategy for PD-NOMA in 6G. Motivated by that, this work compares performances of all DPA strategic design methods as well as FPA techniques, in terms of sum-rate capacity, fairness, and bit error rate (BER). Results showed that the best DPA strategic design method and the best FPA technique have comparable performance.

A Survey of NOMA for VLC Systems: Research Challenges and Future Trends

“… Implementation of PD-NOMA VLC systems needs further investigation of massive MIMO, advanced user grouping techniques and dimming control. The PD-NOMA system performance significantly depends on the power allocation technique [ 120 , 121 ]. Consequently, more practical studies on improving power allocation techniques are required especially in the case of a large number of users.…”

“…The PD-NOMA system performance significantly depends on the power allocation technique [ 120 , 121 ]. Consequently, more practical studies on improving power allocation techniques are required especially in the case of a large number of users.…”

Potential of sixth‐generation technologies for emerging future wireless networks

“…In the literature, no previous work had compared the performances of all DPA strategic design methods, nor FPA techniques, to ease the selection of a simple strategy for PD‐NOMA in 6G. The contribution by Mounir et al “On the selection of power allocation strategy in power domain non‐orthogonal multiple access (PD‐NOMA) for 6G and beyond” compares performances of all DPA strategic design methods as well as FPA techniques, in terms of sum‐rate capacity, fairness, and bit error rate (BER) 1 . Results showed that the best DPA strategic design method and the best FPA technique have comparable performance.…”

Reconfigurable intelligent surface aided coordinated multipoint transmission for the simultaneous wireless information and power transfer non‐orthogonal multiple access network

“…NOMA works by superposing the information signals of multiple users in the same carrier, relying on successive interference cancellation (SIC) to perform multi-user detection (MUD) at the receiver end. 12,13 It is shown that with proper power allocation, 14 user pairing, and target rate selection, NOMA can achieve better spectral efficiency and reduced outage probability than orthogonal multiple access (OMA) schemes. 15 Integration of CoMP transmission with NOMA can benefit the CEUs greatly because these technologies complement each other with CoMP mitigating the ICI and NOMA improving the spectral efficiency.…”