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

Wen, Haifeng; Yuan, Weijie; Liu, Zilong; Li, Shuangyang

doi:10.1109/twc.2023.3236383

Cited by 17 publications

(7 citation statements)

References 50 publications

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“…In this section, we first introduce the fundamental principles underlying OTFS modulation. Subsequently, we expound upon the input–output correction of OTFS symbols within the DD domain [ 47 , 48 , 49 , 50 , 51 , 52 ].…”

Section: System Modelmentioning

confidence: 99%

Integrated Sensing and Communication via Orthogonal Time Frequency Space Signaling with Hybrid Message Passing Detection and Fractional Parameter Estimation

Zhang,

Cai,

Liu

2023

Sensors

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For the orthogonal time frequency space (OTFS) modulation, we generally multiplex symbols on a new type of carrier waveform in the delay-Doppler (DD) domain. These two parameters can be used to infer the range (R) and velocity (V) of the communication user and sensing target; thus, it is natural for the OTFS to be implemented in integrated sensing and communication (ISAC). A framework for ISAC based on OTFS modulation is proposed in this paper, in which the matched filter scheme with fractional parameter estimation is implemented for radar sensing. In addition, the hybrid message passing (MP) detection algorithm is developed for OTFS symbol demodulation. According to the simulation results, fractional DD shifts associated with multiple targets can be accurately obtained through the proposed framework. Meanwhile, the bit error rate under the proposed detector is less than 10−4 when the signal-to-noise ratio is high enough.

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Section: System Modelmentioning

confidence: 99%

Integrated Sensing and Communication via Orthogonal Time Frequency Space Signaling with Hybrid Message Passing Detection and Fractional Parameter Estimation

Zhang,

Cai,

Liu

2023

Sensors

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“…y t2 e = H t2 re P r x e + w t2 e (11) where y t2 c ∈ C N M ×1 , y t2 e ∈ C N M ×1 , and P r is the transmit power of R. The vectors w t2 c ∈ C N M ×1 and w t2 e ∈ C N M ×1 are i.i.d. complex Gaussian noise having zero mean and variance σ 2 , and…”

Section: B Scheme Designmentioning

confidence: 99%

“…Fortunately, the recently proposed orthogonal time frequency space (OTFS) modulation can effectively combat the doubly-selective fading of high-mobility channels by utilizing relatively sparse and stable delay-Doppler domain signal processing [8], [9]. Therefore, some research efforts have been dedicated to studying OTFS-NOMA for direct transmission systems [10], [11], but it usually uses simulations to analyze system performance because of the great challenge of accurate theoretical analysis caused by signal multi-domain transformation and superposition coding.…”

Section: Introductionmentioning

confidence: 99%

Performance of OTFS-NOMA Scheme for Coordinated Direct and Relay Transmission Networks in High-Mobility Scenarios

Xu¹,

Du²,

Yuan³

et al. 2023

Preprint

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In this paper, an orthogonal time frequency space (OTFS) based non-orthogonal multiple access (NOMA) scheme is investigated for the coordinated direct and relay transmission system, where a source directly communicates with a near user with high mobile speed, and it needs the relaying assistance to serve the far user also having high mobility. Due to the coexistence of signal superposition coding and multi-domain transformation, the performance of OTFS-based NOMA is usually challenging to be measured from a theoretical perspective. To accurately evaluate the system performance of the proposed scheme, we derive the closed-form expressions for the outage probability and the outage sum rate by using the Inversion formula and characteristic function. Numerical results verify the performance superiority and the effectiveness of the proposed scheme.

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“…More recently, OTFS-based non-orthogonal multiple-access (NOMA) communication schemes have been studied [14]- [17], where different users arranged in the same DD-domain resource blocks (RBs) are distinguished by their unique sparse codewords [14], [15], [17] and power levels [16]. However, the performance of OTFS-NOMA may degrade significantly due to the non-orthogonality-induced interference, and the excessive complexity of the transceiver [18].…”

Section: Introductionmentioning

confidence: 99%

Space-Time Shift Keying Aided OTFS Modulation for Orthogonal Multiple Access

Sui,

Zhang,

Sun

et al. 2023

IEEE Trans. Commun.

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Space-time shift keying-aided orthogonal time frequency space modulation-based multiple access (STSK-OTFS-MA) is proposed for reliable uplink transmission in high-Doppler scenarios. As a beneficial feature of our STSK-OTFS-MA system, extra information bits are mapped onto the indices of the active dispersion matrices, which allows the system to enjoy the joint benefits of both STSK and OTFS signalling. Due to the fact that both the time-, space-and DD-domain degrees of freedom are jointly exploited, our STSK-OTFS-MA achieves increased diversity and coding gains. To mitigate the potentially excessive detection complexity, the sparse structure of the equivalent transmitted symbol vector is exploited, resulting in a pair of low-complexity near-maximum likelihood (ML) multiuser detection algorithms. Explicitly, we conceive a progressive residual check-based greedy detector (PRCGD) and an iterative reduced-space check-based detector (IRCD). Then, we derive both the unconditional single-user pairwise error probability (SU-UPEP) and a tight bit error ratio (BER) union-bound for our single-user STSK-OTFS-MA system employing the ML detector. Furthermore, the discrete-input continuous-output memoryless channel (DCMC) capacity of the proposed system is derived. The optimal dispersion matrices (DMs) are designed based on the maximum attainable diversity and coding gain metrics. Finally, it is demonstrated that our STSK-OTFS-MA system achieves both a lower BER and a higher DCMC capacity than its conventional spatial modulation (SM) and its orthogonal frequency-division multiplexing (OFDM) counterparts. As a benefit, the proposed system strikes a compelling BER vs. system complexity as well as BER vs. detection complexity trade-offs.

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

Cited by 17 publications

References 50 publications

Integrated Sensing and Communication via Orthogonal Time Frequency Space Signaling with Hybrid Message Passing Detection and Fractional Parameter Estimation

Integrated Sensing and Communication via Orthogonal Time Frequency Space Signaling with Hybrid Message Passing Detection and Fractional Parameter Estimation

Performance of OTFS-NOMA Scheme for Coordinated Direct and Relay Transmission Networks in High-Mobility Scenarios

Space-Time Shift Keying Aided OTFS Modulation for Orthogonal Multiple Access

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