OTFS-SCMA: A Code-Domain NOMA Approach for Orthogonal Time Frequency Space Modulation

Deka, Kuntal; Thomas, Anna; Sharma, Sanjeev

doi:10.1109/tcomm.2021.3075237

Cited by 65 publications

(37 citation statements)

References 22 publications

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“…The SER performance [14] for sample value of SNR is compared with, the different codebooks mentioned in the Table 1. The conventional codebook [1] is designed for 6 users and 4 RE, thus at 1.5 overloading rate for which the SER performance at 18 dB is 3.2x10 -4 with MED as 1.…”

Section: Simulation Resultsmentioning

confidence: 99%

Optimized SCMA Codebook Design Using Rotation Based Sub-Divided Constellation for Overloaded System

Madhura

Rukmini

Raut

2021

Preprint

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5G in wireless communication aims at deploying massive connectivity. Sparse Code Multiple Access (SCMA), proves to be an emerging candidate with multidimensional codebooks proposing, high shaping gain and advanced multiuser detection. A framework for designing a codebook for 200 % overloaded SCMA system with system model is presented in this paper. This article aims at delineating a codebook by subdividing the Mother Constellation (MC) and rotating it to achieve a better Symbol Error Rate (SER) performance over higher values of SNR. Different Codebook designs are taken into consideration for comparing with the sub-constellation based 200% overloaded SCMA. Abstract — 5G in wireless communication aims at deploying massive connectivity. Sparse Code Multiple Access (SCMA), proves to be an emerging candidate with multidimensional codebooks proposing, high shaping gain and advanced multiuser detection. A framework for designing a codebook for 200 % overloaded SCMA system with system model is presented in this paper. This article aims at delineating a codebook by subdividing the Mother Constellation (MC) and rotating it to achieve a better Symbol Error Rate (SER) performance over higher values of SNR. Different Codebook designs are taken into consideration for comparing with the sub-constellation based 200% overloaded SCMA.

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Section: Simulation Resultsmentioning

confidence: 99%

Optimized SCMA Codebook Design Using Rotation Based Sub-Divided Constellation for Overloaded System

Madhura

Rukmini

Raut

2021

Preprint

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“…OTFS with power-domain NOMA was explored in [4,5]. Recently, we proposed a code-domain NOMA approach for OTFS based on sparse code multiple access (SCMA), named OTFS-SCMA [6]. The simulation results and diversity analysis showed the superiority of OTFS-SCMA over other multi-user techniques of OTFS.…”

Section: A Motivationmentioning

confidence: 99%

“…OTFS-SCMA is a code-domain NOMA approach for OTFS recently proposed in [6]. The key features of OTFS-SCMA are described in the following.…”

Section: Otfs-scmamentioning

confidence: 99%

“…1) Codeword Allocation Schemes: The significant difference of OTFS-SCMA from the other related works is that it uses SCMA vector codewords as data symbols instead of QAM symbols. In [6], three schemes of SCMA codeword allocation are presented. In Scheme-1, the codewords are placed along the Doppler axis as K ×1 vectors and hence N should be an integer multiple of K.…”

Section: Draftmentioning

confidence: 99%

“…Thus the sequential OTFS and SCMA detection is not feasible in uplink. A combined detector for OTFS-SCMA is proposed in [6] using MPA, which resolves the DD and the multi-user interference in single stage.…”

Section: Draftmentioning

confidence: 99%

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Convolutional Sparse Coding based Channel Estimation for OTFS-SCMA in Uplink

Thomas¹,

Deka²,

Raviteja³

et al. 2021

Preprint

Self Cite

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Orthogonal time frequency space (OTFS) has emerged as the most sought-after modulation technique in a high mobility scenario. Sparse code multiple access (SCMA) is an attractive code-domain nonorthogonal multiple access (NOMA) technique. Recently a code-domain NOMA approach for OTFS, named OTFS-SCMA, is proposed. OTFS-SCMA is a promising framework that meets the demands of high mobility and massive connectivity. This paper presents a channel estimation technique based on the convolutional sparse coding (CSC) approach for OTFS-SCMA in the uplink. The channel estimation task is formulated as a CSC problem following a careful rearrangement of the OTFS input-output relation. We use an embedded pilot-aided sparse-pilot structure that enjoys the features of both OTFS and SCMA. The existing channel estimation techniques for OTFS in multi-user scenarios for uplink demand extremely high overhead for pilot and guard symbols, proportional to the number of users. The proposed method maintains a minimal overhead equivalent to a single user without compromising on the estimation error. The results show that the proposed channel estimation algorithm is very efficient in bit error rate (BER), normalized mean square error (NMSE), and spectral efficiency (SE).

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A BEM-OTFS channel estimation method for high mobility 6G-V2X

Xiang,

Hao,

2024

SIViP

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OTFS-SCMA: A Code-Domain NOMA Approach for Orthogonal Time Frequency Space Modulation

Cited by 65 publications

References 22 publications

Optimized SCMA Codebook Design Using Rotation Based Sub-Divided Constellation for Overloaded System

Optimized SCMA Codebook Design Using Rotation Based Sub-Divided Constellation for Overloaded System

Convolutional Sparse Coding based Channel Estimation for OTFS-SCMA in Uplink

A BEM-OTFS channel estimation method for high mobility 6G-V2X

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