Power-Imbalanced Low-Density Signatures (LDS) From Eisenstein Numbers

Liu, Zilong; Xiao, Pei; Mheich, Zeina

doi:10.1109/vts-apwcs.2019.8851632

Cited by 15 publications

(10 citation statements)

References 14 publications

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Section: Designsmentioning

confidence: 99%

“…In this section, we assess the performance of our proposed LDS code sets against the LDS sets in [12], for quadrature amplitude modulation (QAM) signaling. We observed that when the non-zero positions of the LDS code sets generated according to [12] are different than those of the proposed LDS code sets, the bit error rate (BER) performance of the former deteriorates substantially. Therefore, while generating the LDS codes of sizes 7 × 9 and 13 × 15 based on [12], the non-zero entries are kept in the same positions as those in the proposed LDS sets; however, the values of the non-zero entries are obtained by following the exact procedure outlined in [12].…”

Section: Designsmentioning

confidence: 99%

“…Motivated by this, Wu et al [11] proposed a STS-based LDS signature set design, whose incidence matrix supports superposition based multiuser communications. By using algebraic code construction methods, the authors in [12], [13] proposed a power-imbalanced LDS design of nonzero entries for a given factor graph with the aid of Eisenstein integers 1 . Compared to the design of conventional antipodal 1 Eisenstein integers are complex number of the form = +…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems

Millar¹,

Kulhandjian²,

Alaca³

et al. 2022

Preprint

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In this paper, a code-domain nonorthogonal multiple access (NOMA) technique based on an algebraic design is studied. We propose an improved low-density spreading (LDS) sequence design based on projective geometry. In terms of its bit error rate (BER) performance, our proposed improved LDS code set outperforms the existing LDS designs over the frequencynonselective Rayleigh fading and additive white Gaussian noise (AWGN) channels. We demonstrated that achieving the best BER depends on the minimum distance.

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Section: Designsmentioning

confidence: 99%

Section: Designsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems

Millar¹,

Kulhandjian²,

Alaca³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…A novel sparse code multiple access (SCMA) scheme named delayed bit-interleaved coded SCMA(DBIC-SCMA) was investigated in [25] and significant improvements in error rate performance was achieved over the classical BIC-SCMA scheme. [26] indicated that the performance of LDS with the aid of Eisenstein number is comparable to that of SCMA in Rayleigh fading channels and better in Gaussian channels than that of SCMA.…”

Section: Introductionmentioning

confidence: 99%

SCMA Codebook Design Based on Divided Extended Mother Codebook

et al. 2021

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Sparse code multiple access (SCMA) is one of the competitive non-orthogonal multiple access (NOMA) techniques for the next generation communication systems. In this paper, we put forward a simple and efficient design method named divided extended mother codebook (DEMC) to construct SCMA codebooks based on golden angle modulation (GAM) constellation points. First, we generate a vector defined by the GAM. Second, we design the extended mother codebook (EMC) by introducing the power and phase dependent constraints of symbols in multi-dimension codewords. The power constraints can ensure the power of each codeword is the same which leads to the optimal peak to average power ratio (PAPR) especially for the uplink channel. Third, we divide the EMC into several mother codebooks (MCs) to generate the constant bit rate (CBR) or variable bit rate (VBR) SCMA codebooks. The structure of the VBR SCMA codebooks is compatible with that of CBR. The VBR codebooks and CBR codebooks use the same factor graph, therefore, the users employed the VBR codebooks can also utilize the efficient message passing algorithm (MPA) for multi-user detection. Simulations reveal that the bit error rate (BER) performance of the proposed CBR DEMC-SCMA codebooks is outstanding with low complexity. The VBR DEMC-SCMA codebooks can flexibly satisfy the different service requirements, and the BER performance of the VBR DEMC-SCMA codebooks is close to each other though their modulation orders are various. This feature shows that the users can apply for a high order codebook to get a faster information transfer rate without increasing transmission power and bandwidth.INDEX TERMS sparse code multiple access (SCMA), constant bit rate (CBR) codebook, variable bit rate (VBR) codebook, design of dependent multi-dimension codeword

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“…In this paper, building upon our preliminary results in [16], we develop a novel class of powerimbalanced SCMA codebooks having power variation among different users for downlink transmission. By leveraging the power-imbalance (a unique trait of power-domain NOMA), we aim to take advantage of the "near-far effect" among different users in order to attain enhanced MPA decoding.…”

Section: Introductionmentioning

confidence: 99%

Design of Power-Imbalanced SCMA Codebook

Gao

Gui

et al. 2022

IEEE Trans. Veh. Technol.

Self Cite

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Sparse code multiple access (SCMA) is a promising multiuser communication technique for the enabling of future massive machine-type networks. Unlike existing codebook design schemes assuming uniform power allocation, we present a novel class of SCMA codebooks which display power imbalance among different users for downlink transmission. Based on the Star-QAM mother constellation structure and with the aid of genetic algorithm, we optimize the minimum Euclidean distance (MED) and the minimum product distance (MPD) of the proposed codebooks. Numerical simulation results show that our proposed codebooks lead to significantly improved error rate performances over Gaussian channels and Rayleigh fading channels.

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Power-Imbalanced Low-Density Signatures (LDS) From Eisenstein Numbers

Cited by 15 publications

References 14 publications

Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems

Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems

SCMA Codebook Design Based on Divided Extended Mother Codebook

Design of Power-Imbalanced SCMA Codebook

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