Spatial modulation aided non-orthogonal multiple access

Abstract

For easing the burden on the heavily-loaded communication systems, high-throughput spatial modulation-aided non-orthogonal multiple access (SM-NOMA) schemes are proposed and investigated. Firstly, SM-aided sparse code-division multiple access (SMSCDMA) is conceived, which exploits the joint benefits of SM and SCDMA. Furthermore, the advantages of multicarrier (MC) signalling and SM-SCDMA are amalgamated to conceive a SM/MC-SCDMA transceiver. Sparse frequency-domain spreading is utilized for mitigating the peak-to-average power ratio of MC signalling, as well as for facilitating low-complexity detection using the message passing-aided detection (MPAD). Furthermore, grant-free access is designed for SM-NOMA in order to support large-scale access for devices transmitting in a sporadic pattern at a low rate. Explicitly, a pair of compressive sensing-based low-complexity detectors are conceived for jointly detecting the identity of the active users and their transmitted data. Additionally, a reduced-complexity hybrid detector and decoder (HDD) is conceived for turbo-coded sparse code multiple access (SCMA) by analysing its convergence behavior using EXtrinsic Information Transfer (EXIT) charts. Furthermore, we propose an adaptive turbo-coded SCMA system for mitigating the influence of multipath propagation so that the system’s bits per symbol throughput may be improved under favorable channel conditions by using the most appropriate operational mode in the light of the near-instantaneous user load, modulation order and coding rate. Furthermore, space-time coded generalized SM-aided SCDMA (STC/GSM-SCDMA) is proposed, which exploits the benefits of multi-dimensional transmit diversity in the context of multiple-input multiple-output systems. As an additional solution, a generalised SM-aided sparse space-time-frequency spreading (GSM/SSTFS) scheme is also proposed for supporting large-scale access at a high normalized user-load in the context of nextgeneration systems by simultaneously exploiting the transmit diversity in the spatial-, time- and frequency-domain, which outperforms conventional multiple-input multipleoutput NOMA systems.

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Identifiers

ORCID for Lajos Hanzo: orcid.org/0000-0002-2636-5214

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