Luo, Qu and Xiao, Pei and Liu, Zilong and Wan, Ziwei and Thomos, Nikolaos and Gao, Zhen and He, Ziming (2024) AFDM-SCMA: A Promising Waveform for Massive Connectivity over High Mobility Channels. IEEE Transactions on Wireless Communications. DOI https://doi.org/10.1109/twc.2024.3413980
Luo, Qu and Xiao, Pei and Liu, Zilong and Wan, Ziwei and Thomos, Nikolaos and Gao, Zhen and He, Ziming (2024) AFDM-SCMA: A Promising Waveform for Massive Connectivity over High Mobility Channels. IEEE Transactions on Wireless Communications. DOI https://doi.org/10.1109/twc.2024.3413980
Luo, Qu and Xiao, Pei and Liu, Zilong and Wan, Ziwei and Thomos, Nikolaos and Gao, Zhen and He, Ziming (2024) AFDM-SCMA: A Promising Waveform for Massive Connectivity over High Mobility Channels. IEEE Transactions on Wireless Communications. DOI https://doi.org/10.1109/twc.2024.3413980
Abstract
This paper studies the affine frequency division multiplexing (AFDM)-empowered sparse code multiple access (SCMA) system, referred to as AFDM-SCMA, for supporting massive connectivity in high-mobility environments. First, by placing the sparse codewords on the AFDM chirp subcarriers, the input-output (I/O) relation of AFDM-SCMA systems is presented. Next, we delve into the generalized receiver design, chirp rate selection, and error rate performance of the proposed AFDM-SCMA The proposed AFDM-SCMA is shown to provide a general framework and subsume the existing OFDM-SCMA as a special case. Third, for efficient transceiver design, we further propose a class of sparse codebooks for simplifying the I/O relation, referred to as I/O relation-inspired codebook design in this paper. Building upon these codebooks, we propose a novel iterative detection and decoding scheme with linear minimum mean square error (LMMSE) estimator for both downlink and uplink channels based on orthogonal approximate message passing principles. Our numerical results demonstrate the superiority of the proposed AFDM-SCMA systems over OFDM-SCMA systems in terms of the error rate performance. We show that the proposed receiver can significantly enhance the error rate performance while reducing the detection complexity.
Item Type: | Article |
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Uncontrolled Keywords: | Sparse code multiple access (SCMA); affine frequency division multiplexing (AFDM); chirp subcarrier; high-mobility channels; codebook design; orthogonal approximate message passing (OAMP); iterative detection and decoding |
Divisions: | Faculty of Science and Health > Computer Science and Electronic Engineering, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 25 Jun 2024 08:15 |
Last Modified: | 25 Jun 2024 08:15 |
URI: | http://repository.essex.ac.uk/id/eprint/38622 |
Available files
Filename: AFDM_SCMA_TWC_final.pdf