On the Performance of GFDM Assisted NOMA Schemes

Abstract

From the points of spectral efficiency, low latency and massive connectivity, novel modulation and multiple access schemes have been proposed in fifth generation (5G) wireless networks. However, the combinations of multiplexing and multiple access techniques have not been widely investigated in most literatures. Therefore, we joint generalized frequency division multiplexing (GFDM) waveforms and power-domain non-orthogonal multiple access (NOMA) systems together in order to further extend the framework of multi-carrier NOMA, and also achieve performance evaluations for NOMA networks with one base station and two users. Basically, theoretical BER expressions of downlink and uplink GFDM assisted NOMA schemes are mathematically derived and then verified by simulation results. In addition, combined performance advantages, including higher achievable sum rate, lower peak-to-average power ratio (PAPR) and out of band power (OOBP) radiation, can be obtained in GFDM assisted NOMA networks. INDEX TERMS 5G, generalized frequency division multiplexing (GFDM), non-orthogonal multiple access (NOMA), multi-carrier NOMA, theoretical BER.

Gyre Precoding and T-Transformation-Based GFDM System for UAV-Aided mMTC Network

“…In Figure 10, estimated maximum achievable ergodic rate values at different normalized signalto-noise ratios (E b /N 0 ) are compared with the similar works of different authors from [38][39][40]. It is quite clear from the figure that the proposed system outperforms all the other similar works utilizing different systems.…”

“…In Figure 15, BER performance of the proposed system utilizing (3,2) SPC and RA concatenated channel-coding technique has been compared with other GFDM systems introduced in previous works. From a brief description perspective of the systems presented in [39,[41][42][43], it can be said that the authors in [41] did a thorough analysis on the applicability of wireless energy harvested GFDM-based cooperative network and presented numerical results in terms of BER. In [42], the effectiveness of localized discrete gabor transform (LDGT) algorithm implemented the GFDM system with varying windowing lengths was studied accounting the BER performance.…”

“…In [42], the effectiveness of localized discrete gabor transform (LDGT) algorithm implemented the GFDM system with varying windowing lengths was studied accounting the BER performance. Authors in [39] conducted a performance evaluative study for a GFDM-assisted NOMA system with respect to BER and achievable rate analysis. In [43], the authors highlighted the effectiveness of a designed pulse shaping filter based on quadratic programming in reducing the OOB radiation and BER performance of the GFDM system.…”

Pilot Pouring in Superimposed Training for Channel Estimation in CB-FMT

“…In addition, FMT can be efficiently implemented with architectures based on poly-phase discrete Fourier transform (DFT) filter-banks [4]. There exist different multi-carrier waveforms proposed in the literature, such as filter-bank multi-carrier (FBMC) [5]- [7], universal filtered multi-carrier (UFMC) [8], [9], generalized frequency division multiplexing (GFDM) [10], [11] and cyclic block FMT (CB-FMT) [12], [13]. FBMC [5]- [7] is the waveform with the lowest out-out-band emissions due to the fact that each subcarrier is filtered by a well-localized prototype filter in the frequency domain.…”

“…Its main drawback corresponds to the residual tail of the filter, which also provokes an intrinsic ISI and ICI. GFDM [10], [11] and CB-FMT [12], [13] are also block-filtered waveforms, similar to UFMC. However, they both exploit a circular pulse shaping that enables the use of the cyclic prefix (CP) and avoids the ISI and ICI due to multi-path channel.…”