OTFS-SCMA : A Downlink NOMA Scheme for Massive Connectivity in High Mobility Channels

Haifeng WEN; Weijie YUAN; Zilong LIU; Shuangyang LI

doi:10.1109/TWC.2023.3236383

OTFS-SCMA : A Downlink NOMA Scheme for Massive Connectivity in High Mobility Channels

Haifeng WEN, Weijie YUAN^*, Zilong LIU, Shuangyang LI

^*Corresponding author for this work

Research output: Journal Publications › Journal Article (refereed) › peer-review

19 Citations (Scopus)

Abstract

This paper studies a downlink system that combines orthogonal-time-frequency-space (OTFS) modulation and sparse code multiple access (SCMA) to support massive connectivity in high-mobility environments. We propose a cross-domain receiver for the considered OTFS-SCMA system which efficiently carries out OTFS symbol estimation and SCMA decoding in a joint manner. This is done by iteratively passing the extrinsic information between the time domain and the delay-Doppler (DD) domain via the corresponding unitary transformation to ensure the principal orthogonality of errors from each domain. We show that the proposed OTFS-SCMA detection algorithm exists at a fixed point in the state evolution when it converges. To further enhance the error performance of the proposed OTFS-SCMA system, we investigate the cooperation between downlink users to exploit the diversity gains and develop a distributed cooperative detection (DCD) algorithm with the aid of belief consensus. Our numerical results demonstrate the effectiveness and convergence of the proposed algorithm and show an increased spectral efficiency compared to the conventional OTFS transmission.

Original language	English
Pages (from-to)	5770-5784
Number of pages	15
Journal	IEEE Transactions on Wireless Communications
Volume	22
Issue number	9
Early online date	19 Jan 2023
DOIs	https://doi.org/10.1109/TWC.2023.3236383
Publication status	Published - Sept 2023
Externally published	Yes

Bibliographical note

This work was supported in part by the National Natural Science Foundation of China under Grant 62101232, in part by the Guangdong Provincial Natural Science Foundation under Grant 2022A1515011257, and in part by the Shenzhen Science and Technology Program under Grant JCYJ20220530114412029. The work of Zilong Liu was supported in part by the U.K. Engineering and Physical Sciences Research Council under Grant EP/P03456X/1 and in part by the Research Council of Norway under Grant 311646/070.

Keywords

distributed cooperation
multiple access
non-orthogonal multiple access (NOMA)
Orthogonal time frequency space (OTFS)
sparse code multiple access (SCMA)
state evolution

Access to Document

10.1109/TWC.2023.3236383

Cite this

@article{e9678c7e34684b52a5fe6655a326a16a,

title = "OTFS-SCMA : A Downlink NOMA Scheme for Massive Connectivity in High Mobility Channels",

abstract = "This paper studies a downlink system that combines orthogonal-time-frequency-space (OTFS) modulation and sparse code multiple access (SCMA) to support massive connectivity in high-mobility environments. We propose a cross-domain receiver for the considered OTFS-SCMA system which efficiently carries out OTFS symbol estimation and SCMA decoding in a joint manner. This is done by iteratively passing the extrinsic information between the time domain and the delay-Doppler (DD) domain via the corresponding unitary transformation to ensure the principal orthogonality of errors from each domain. We show that the proposed OTFS-SCMA detection algorithm exists at a fixed point in the state evolution when it converges. To further enhance the error performance of the proposed OTFS-SCMA system, we investigate the cooperation between downlink users to exploit the diversity gains and develop a distributed cooperative detection (DCD) algorithm with the aid of belief consensus. Our numerical results demonstrate the effectiveness and convergence of the proposed algorithm and show an increased spectral efficiency compared to the conventional OTFS transmission.",

keywords = "distributed cooperation, multiple access, non-orthogonal multiple access (NOMA), Orthogonal time frequency space (OTFS), sparse code multiple access (SCMA), state evolution",

author = "Haifeng WEN and Weijie YUAN and Zilong LIU and Shuangyang LI",

note = "This work was supported in part by the National Natural Science Foundation of China under Grant 62101232, in part by the Guangdong Provincial Natural Science Foundation under Grant 2022A1515011257, and in part by the Shenzhen Science and Technology Program under Grant JCYJ20220530114412029. The work of Zilong Liu was supported in part by the U.K. Engineering and Physical Sciences Research Council under Grant EP/P03456X/1 and in part by the Research Council of Norway under Grant 311646/070.",

year = "2023",

month = sep,

doi = "10.1109/TWC.2023.3236383",

language = "English",

volume = "22",

pages = "5770--5784",

journal = "IEEE Transactions on Wireless Communications",

issn = "1536-1276",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "9",

}

TY - JOUR

T1 - OTFS-SCMA : A Downlink NOMA Scheme for Massive Connectivity in High Mobility Channels

AU - WEN, Haifeng

AU - YUAN, Weijie

AU - LIU, Zilong

AU - LI, Shuangyang

N1 - This work was supported in part by the National Natural Science Foundation of China under Grant 62101232, in part by the Guangdong Provincial Natural Science Foundation under Grant 2022A1515011257, and in part by the Shenzhen Science and Technology Program under Grant JCYJ20220530114412029. The work of Zilong Liu was supported in part by the U.K. Engineering and Physical Sciences Research Council under Grant EP/P03456X/1 and in part by the Research Council of Norway under Grant 311646/070.

PY - 2023/9

Y1 - 2023/9

N2 - This paper studies a downlink system that combines orthogonal-time-frequency-space (OTFS) modulation and sparse code multiple access (SCMA) to support massive connectivity in high-mobility environments. We propose a cross-domain receiver for the considered OTFS-SCMA system which efficiently carries out OTFS symbol estimation and SCMA decoding in a joint manner. This is done by iteratively passing the extrinsic information between the time domain and the delay-Doppler (DD) domain via the corresponding unitary transformation to ensure the principal orthogonality of errors from each domain. We show that the proposed OTFS-SCMA detection algorithm exists at a fixed point in the state evolution when it converges. To further enhance the error performance of the proposed OTFS-SCMA system, we investigate the cooperation between downlink users to exploit the diversity gains and develop a distributed cooperative detection (DCD) algorithm with the aid of belief consensus. Our numerical results demonstrate the effectiveness and convergence of the proposed algorithm and show an increased spectral efficiency compared to the conventional OTFS transmission.

AB - This paper studies a downlink system that combines orthogonal-time-frequency-space (OTFS) modulation and sparse code multiple access (SCMA) to support massive connectivity in high-mobility environments. We propose a cross-domain receiver for the considered OTFS-SCMA system which efficiently carries out OTFS symbol estimation and SCMA decoding in a joint manner. This is done by iteratively passing the extrinsic information between the time domain and the delay-Doppler (DD) domain via the corresponding unitary transformation to ensure the principal orthogonality of errors from each domain. We show that the proposed OTFS-SCMA detection algorithm exists at a fixed point in the state evolution when it converges. To further enhance the error performance of the proposed OTFS-SCMA system, we investigate the cooperation between downlink users to exploit the diversity gains and develop a distributed cooperative detection (DCD) algorithm with the aid of belief consensus. Our numerical results demonstrate the effectiveness and convergence of the proposed algorithm and show an increased spectral efficiency compared to the conventional OTFS transmission.

KW - distributed cooperation

KW - multiple access

KW - non-orthogonal multiple access (NOMA)

KW - Orthogonal time frequency space (OTFS)

KW - sparse code multiple access (SCMA)

KW - state evolution

UR - http://www.scopus.com/inward/record.url?scp=85147289583&partnerID=8YFLogxK

U2 - 10.1109/TWC.2023.3236383

DO - 10.1109/TWC.2023.3236383

M3 - Journal Article (refereed)

AN - SCOPUS:85147289583

SN - 1536-1276

VL - 22

SP - 5770

EP - 5784

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

IS - 9

ER -

OTFS-SCMA : A Downlink NOMA Scheme for Massive Connectivity in High Mobility Channels

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Cite this