Joint Channel Estimation and Data Detection for Hybrid RIS Aided Millimeter Wave OTFS Systems

Li, Muye; Zhang, Shun; Ge, Yao; Gao, Feifei; Fan, Peng‐Fei

doi:10.1109/tcomm.2022.3199019

Cited by 55 publications

(17 citation statements)

References 35 publications

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“…Λ t+1,i = 1. Therefore, the variable nodes further update the mean vector µ (t+1) as µ (t+1) = µ (1) , µ (2)…”

Section: A Memory Amp Detectormentioning

confidence: 99%

“…Unlike OFDM, OTFS multiplexes information symbols in the delay-Doppler domain and exploits the diversity coming from both the channel delays and Doppler shifts for better performance. Thanks to the sparsity of the channel in delay-Doppler domain, the required pilot and receiver complexity for channel estimation can be significantly reduced [2]. However, the equivalent transmission of OTFS in the delay-Doppler domain involves a sophisticated two-dimensional periodic convolution, leading to severe inter-symbol interference (ISI) [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-Complexity Memory AMP Detector for High-Mobility MIMO-OTFS SCMA Systems

Liu¹,

Huang²,

G.³

et al. 2023

Preprint

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Efficient signal detectors are rather important yet challenging to achieve satisfactory performance for large-scale communication systems. This paper considers a non-orthogonal sparse code multiple access (SCMA) configuration for multipleinput multiple-output (MIMO) systems with recently proposed orthogonal time frequency space (OTFS) modulation. We develop a novel low-complexity yet effective customized Memory approximate message passing (AMP) algorithm for channel equalization and multi-user detection. Specifically, the proposed Memory AMP detector enjoys the sparsity of the channel matrix and only applies matrix-vector multiplications in each iteration for low-complexity. To alleviate the performance degradation caused by positive reinforcement problem in the iterative process, all the preceding messages are utilized to guarantee the orthogonality principle in Memory AMP detector. Simulation results are finally provided to illustrate the superiority of our Memory AMP detector over the existing solutions.

show abstract

“…Λ t+1,i = 1. Therefore, the variable nodes further update the mean vector µ (t+1) as µ (t+1) = µ (1) , µ (2)…”

Section: A Memory Amp Detectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-Complexity Memory AMP Detector for High-Mobility MIMO-OTFS SCMA Systems

Liu¹,

Huang²,

G.³

et al. 2023

Preprint

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show abstract

“…in superior performance and more reliable communications compared to OFDM. OTFS can effectively simplify channel estimation [3]- [5] and symbol detection [6]- [9] at wireless receivers by utilizing the property of a quasi-stationary sparse channel in delay-Doppler domain for high-mobility communication scenarios. The performance of uncoded and coded OTFS systems has been analyzed and evaluated in [10]- [12] and [13], respectively.…”

Section: Introductionmentioning

confidence: 99%

OTFS Signaling for SCMA With Coordinated Multi-Point Vehicle Communications

Deng

González

et al. 2023

IEEE Trans. Veh. Technol.

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This paper investigates an uplink coordinated multipoint (CoMP) coverage scenario, in which multiple mobile users are grouped for sparse code multiple access (SCMA), and served by the remote radio head (RRH) in front of them and the RRH behind them simultaneously. We apply orthogonal time frequency space (OTFS) modulation for each user to exploit the degrees of freedom arising from both the delay and Doppler domains. As the signals received by the RRHs in front of and behind the users experience respectively positive and negative Doppler frequency shifts, our proposed OTFS-based SCMA (OBSCMA) with CoMP system can effectively harvest extra Doppler and spatial diversity for better performance. Based on maximum likelihood (ML) detector, we analyze the single-user average bit error rate (ABER) bound as the benchmark of the ABER performance for our proposed OBSCMA with CoMP system. We also develop a customized Gaussian approximation with expectation propagation (GAEP) algorithm for multi-user detection and propose efficient algorithm structures for centralized and decentralized detectors. Our proposed OBSCMA with CoMP system leads to stronger performance than the existing solutions. The proposed centralized and decentralized detectors exhibit effective reception and robustness under channel state information uncertainty.

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“…OTFS can exploit the diversity gain from both the delay and Doppler dimensions of a mobile wireless channel since all transmitted symbols can be multiplexed in the delay-Doppler domain and spread over the time-frequency domain [7]- [12]. Furthermore, OTFS can convert the time-varying channel into a twodimensional (2D) quasi-time-invariant channel in the delay-Doppler domain, which significantly reduces the complexity of channel estimation [13]- [15] and symbol detection [16]- [22] at the receiver. Attracted by its advantages, a number of studies of OTFS have examined it in concert with nonorthogonal multiple access (NOMA) [23], millimeter wave (mmWave) communication systems [24], and integrated sensing and communication [25].…”

Section: Introductionmentioning

confidence: 99%

A Novel Block-Wise Index Modulation Scheme for High-Mobility OTFS Communications

Mei

Get

Wen

et al. 2022

2022 IEEE/CIC International Conference on Communications in China (ICCC Workshops)

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As a promising technique for high-mobility wireless communications, orthogonal time frequency space (OTFS) has been proved to enjoy excellent advantages with respect to traditional orthogonal frequency division multiplexing (OFDM). However, a challenging problem is to design efficient systems to further improve the performance. In this paper, we propose a novel block-wise index modulation (IM) scheme for OTFS systems, named Doppler-IM with OTFS (DoIM-OTFS), where a block of Doppler resource bins are activated simultaneously. For practical implementation, we develop a low complexity customized message passing (CMP) algorithm for our proposed DoIM-OTFS scheme. Simulation results demonstrate our proposed DoIM-OTFS system outperforms traditional OTFS system without IM. The proposed CMP algorithm can achieve desired performance and robustness to the imperfect channel state information (CSI).

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Joint Channel Estimation and Data Detection for Hybrid RIS Aided Millimeter Wave OTFS Systems

Cited by 55 publications

References 35 publications

Low-Complexity Memory AMP Detector for High-Mobility MIMO-OTFS SCMA Systems

Low-Complexity Memory AMP Detector for High-Mobility MIMO-OTFS SCMA Systems

OTFS Signaling for SCMA With Coordinated Multi-Point Vehicle Communications

A Novel Block-Wise Index Modulation Scheme for High-Mobility OTFS Communications

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