OTFS Based Receiver Scheme with Multi-Antennas in High-Mobility V2X Systems

Cheng, Junqiang; Jia, Chenglu; Gao, Hui; Xu, Wenjun; Bie, Zhisong

doi:10.1109/iccworkshops49005.2020.9145313

Cited by 14 publications

(8 citation statements)

References 12 publications

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“…The terminal speeds of such V2X systems can reach 300 km/h while terminal speeds of high-speed train applications can reach up to 500 km/h. In this context, the work reported in [2] proposed an OTFS based receiver scheme with multiantennas with application to high-mobility V2X systems. In [14], focusing on V2X short-frame communication, it is shown that pulse-shaped OTFS with tuned one-tap equalization outperforms cyclic-prefix based OFDM, discrete Fourier transform-spread-OFDM, and generalized frequency division multiplexing in terms of packet error rate and maximum data rate.…”

Section: Related Workmentioning

confidence: 99%

Performance Assessment of OTFS Modulation in High Doppler Airborne Communication Networks

et al. 2022

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Emerging 5G and future 6G mobile networks are expected to cater for high mobility scenarios ranging from vehicle-to-vehicle communications to unmanned aerial vehicles and airborne platforms. Communications in this type of deployments suffer from severe Doppler shifts which require new modulation waveforms. Orthogonal time frequency space (OTFS) modulation has recently been proposed as a promising technology for coping with high Doppler channels. OTFS converts a time-varying fading channel into a time-independent channel in the two-dimensional delay-Doppler (DD) domain. The transmit symbols are multiplexed into a nearly constant channel with a complex channel gain in the DD domain. In this paper, we consider a high Doppler airborne communication network where relative mobile node speeds can be above 1200 m/s. The considered system represents a mobile ad-hoc network where the airborne mobile nodes can join or leave the network. Furthermore, each node is equipped with an antenna array that supports directed communication among mobile nodes. The Doppler shifts in this airborne communication network are in the order of 52-72 kHz and may potentially be even higher depending on the selected carrier frequency and the relative speed among the airborne platforms. As such, OTFS modulation is used in this work to efficiently compensate for the high Doppler shifts in the DD domain. In particular, a comprehensive performance assessment in terms of bit error rate (BER) is conducted to reveal the potential of OTFS modulation in dealing with such extreme transmission scenarios. The impact of physical layer parameters, number of delay-Doppler bins in the DD domain used for OTFS modulation, directed versus two-ray channels, and the combination of multiple-input multiple-output (MIMO) systems with OTFS modulation on the BER is assessed. It is shown that both OTFS modulation over a two-ray channel as well as MIMO-OTFS modulation provide a reliable airborne communication network with low BER.

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Section: Related Workmentioning

confidence: 99%

Performance Assessment of OTFS Modulation in High Doppler Airborne Communication Networks

et al. 2022

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“…Moreover, the MIMO diagram of OFDM-based OTFS was conceived in [14] and it has the same ergodic capacity as OFDM. In addition, the performance of MIMO-OTFS systems in diverse high-mobility scenarios, such as V2X and UAV, has been investigated in [16,17], which indicates that MIMO-OTFS is able to provide a significant performance gain over conventional multi-carrier modulation schemes in highmobility applications.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis for orthogonal time frequency space modulation systems with generalized waveform

Xiao

Liu

et al. 2023

China Commun.

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Orthogonal time-frequency space (OTFS), which exhibits beneficial advantages in high-mobility scenarios, has been considered as a promising technology in future wireless communication systems. In this paper, a universal model for OTFS systems with generalized waveform has been developed. Furthermore, the average bit error probability (ABEP) upper bounds of the optimal maximum likelihood (ML) detector are first derived for OTFS systems with generalized waveforms. Specifically, for OTFS systems with the ideal waveform, we elicit the ABEP bound by recombining the transmitted signal and the received signal. For OTFS systems with practical waveforms, a universal ABEP upper bound expression is derived using moment generating-function (MGF), which is further extended to MIMO-OTFS systems. Numerical results validate that our theoretical ABEP upper bounds are concur with the simulation performance achieved by ML detectors.

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“…It is demonstrated in [11,12] that OTFS has the potential for full diversity. However, the OTFS modulation system still suffers from inter-symbol interference and inter-subcarrier interference, which require equalization techniques to ensure transmission performance [13].…”

Section: Introductionmentioning

confidence: 99%

Low-Complexity Iterative Equalization for OTFS Based on Alternating Minimization

He,

Jia,

Sun

et al. 2023

J. of Syst. Eng. Electron.

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To achieve robust communication in high mobility scenarios, an iterative equalization algorithm based on alternating minimization (AM) is proposed for the orthogonal time frequency space (OTFS) system. The algorithm approximates the equalization problem to a convex function optimization problem in the real-valued domain and solves the problem iteratively using the AM algorithm. In the iterative process, the complexity of the proposed algorithm is reduced further based on the study of the cyclic structure and sparse property of the OTFS channel matrix in the delay-Doppler (DD) domain. The new method for OTFS is simulated and verified in a high-speed mobile scenario and the results show that the proposed equalization algorithm has excellent bit error rate performance with low complexity.

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OTFS Based Receiver Scheme with Multi-Antennas in High-Mobility V2X Systems

Cited by 14 publications

References 12 publications

Performance Assessment of OTFS Modulation in High Doppler Airborne Communication Networks

Performance Assessment of OTFS Modulation in High Doppler Airborne Communication Networks

Performance analysis for orthogonal time frequency space modulation systems with generalized waveform

Low-Complexity Iterative Equalization for OTFS Based on Alternating Minimization

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