Nonorthogonal Multiple Access and Carrierless Amplitude Phase Modulation for Flexible Multiuser Provisioning in 5G Mobile Networks

Abstract

Abstract-In this paper, a combined non-orthogonal multiple access (NOMA) and multiband carrierless amplitude phase modulation (multiCAP) scheme is proposed for capacity enhancement of and flexible resource provisioning in 5G mobile networks. The proposed scheme is experimentally evaluated over a W-band millimeter wave radio-over fiber system. The evaluated NOMA-CAP system consists of six 1.25 GHz multiCAP bands and two NOMA levels with quadrature phase shift keying and can provide an aggregated transmission rate of 30 Gbit/s. The proposed system can dynamically adapt to different user densities and data rate requirements. Bit error rate performance is evaluated in two scenarios: a low user density scenario where the system capacity is evenly split between two users and a high user density scenario where NOMA and multiCAP are combined to serve up to twelve users with an assigned data rate of 2.5 Gbit/s each. The proposed system demonstrates how NOMA-CAP allows flexible resource provisioning and can adapt data rates depending on user density and requirements.Index Terms-Non-orthogonal multiple access, multi-band carrierless amplitude phase modulation, radio-over-fiber, millimeterwave communications, W-band wireless.

Optical Power Budget Enhancement in 50–90 Gb/s IM-DD PONs With NOMA-CAP and SOA-Based Amplification

“…The two NOMA levels, named "weak NOMA" and "strong NOMA", were power-weighted according to the power ratio (defined as the relation between the two NOMA levels, = 20 10 ( / )), and added for each multi-CAP band. The multi-CAP signals were upsampled and filtered with a pair of band-specific multi-CAP orthogonal filters and finally the multi-CAP bands were aggregated to form the full data transmitted signal [7]. A squareroot raised cosine (SRRC) filter with a roll off factor equal to 0.2 was used as pulse shaper.…”

“…NOMA and multi-CAP working in tandem, named NOMA-CAP, have been previously reported in [7] and demonstrates flexible multiuser provisioning with a total aggregated capacity of 30 Gb/s and an optical link span limited to 10 km due to the low available optical power budget. Moreover, NOMA-CAP has been recently reported in [8], demonstrating its feasibility for short range (<2 km) optical transmission applications such as 5G mobile fronthaul and data center interconnects, where limited available optical power budgets are the norm.…”

Experimental multi-user VLC system using non-orthogonal multi-band CAP modulation

“…high-order CAP VLC link with an aggregate data rate of 8 Gb/s over a link span of 1 m using a hybrid post equalizer (i.e., a linear Volterra series and a decision-directed least mean squares equalizer) over four wavelengths was reported in [16]. In [17], the scheme for 5G mobile networks combining m-CAP and non-orthogonal multiple access (NOMA) was experimentally evaluated over the W-band millimeter wave radio-over fiber system.…”

Multiband carrierless amplitude and phase index modulation

“…Typically, the main approach adopted is to exploit extra degrees of freedom such as spatial multiplexing (SM), polarization‐division multiplexing (PDM), and multilevel modulation. Some examples of different schemes that have been proposed are nonorthogonal multiple access (NOMA), 3–5 spatial division multiplexing (SDM), 6–9 and multidimensional schemes such as 3‐D/4‐D carrierless amplitude phase (CAP) modulation 10,11 . Recently, there has been a growing interest in index modulation (IM) techniques.…”