Uplink-Aided High Mobility Downlink Channel Estimation Over Massive MIMO-OTFS System

Liu, Yushan; Zhang, Shun; Gao, Feifei; Ma, Jianpeng; Wang, Xianbin

doi:10.1109/jsac.2020.3000884

Cited by 144 publications

(65 citation statements)

References 29 publications

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“…Let (•) N denote the modulo N operation. Substituting w(τ, ν) in ( 4) and the p-th element h q,p (τ, ν) in ( 5) into (2), the final OTFS-based received signal at the p-th antenna of the BS is given by (8) at the top of the next page.…”

Section: System Modelmentioning

confidence: 99%

“…Following this, an OTFS-based uplink multiple-access network was studied in [4], which proposed an uplink multiple-access method to avoid multi-user interference in OTFS. In order to incorporate OTFS modulation into the massive MIMO space, a novel uplink and downlink massive MIMO channel estimation algorithm was presented in [8] and [9] to reduce the training overhead in a high-mobility scenario, respectively. Further, a downlink multi-user massive MIMO system was considered in [10], which proposed a novel multi-user precoder and low-complexity detector.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance Analysis of OTFS-based Uplink Massive MIMO with ZF Receivers

Feng

Ngo

Flanagan

et al. 2021

2021 IEEE International Conference on Communications Workshops (ICC Workshops)

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This paper considers an orthogonal time frequency space (OTFS)-based uplink massive multiple-input-multipleoutput (MIMO) system, in which all users transmit symbols to a base station (BS) that is equipped with an one-dimensional uniform linear array (ULA) in the delay-Doppler domain. The zero-forcing (ZF) decoding scheme is applied at the BS. Different from most existing OTFS works, this paper mainly focuses on the performance analysis. Furthermore, in contrast to the existing massive MIMO works, which assume favorable propagation (FP) conditions, here, we investigate the low but non-zero probability scenario that massive MIMO fails in providing FP. This results in a scenario where the channel matrix cannot be diagonalized with massive MIMO. Thus, to facilitate the performance analysis, a low-complexity approximation of the inverse of the Gram matrix, i.e., the Neumann series expansion, is presented. With this, a simple signal-to-noise-ratio (SNR) approximation is firstly derived, which illuminates the impact of the OTFS system parameters. Moreover, by exploiting the properties of circulant matrices, a compact expression for the OTFS multi-path correlation matrix (OTFS-MPCM) is derived.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of OTFS-based Uplink Massive MIMO with ZF Receivers

Feng

Ngo

Flanagan

et al. 2021

2021 IEEE International Conference on Communications Workshops (ICC Workshops)

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“…As a solution to the aforementioned optimization problem, numerous algorithms have been developed over the past half-century. Any algorithm with high accuracy [30], [31] can be used in Fast-ABS to estimate the ToA, AoA, and gain of multipath. In this paper, we employ the Newtonized orthogonal matching pursuit (NOMP) algorithm [32] in Fast-ABS, because we find that NOMP provides better performance and lower complexity than many existing algorithms [33].…”

Section: Path Parameter Estimation Algorithmmentioning

confidence: 99%

Fast Antenna and Beam Switching Method for mmWave Handsets with Multiple Subarrays

Shih

Wen

Jin

et al. 2020

ICC 2020 - 2020 IEEE International Conference on Communications (ICC)

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Many operators have been bullish on the role of millimeter-wave (mmWave) communications in fifth-generation (5G) mobile broadband because of its capability of delivering extreme data speeds and capacity. However, mmWave comes with challenges related to significantly high path loss and susceptibility to blockage. Particularly, when mmWave communication is applied to a mobile terminal device, communication can be frequently broken because of rampant hand blockage. Although a number of mobile phone companies have suggested configuring multiple sets of antenna modules at different locations on a mobile phone to circumvent this problem, identifying an optimal antenna module and a beam pair by simultaneously opening multiple sets of antenna modules causes the problem of excessive power consumption and device costs. In this study, a fast antenna and beam switching method termed Fast-ABS is proposed. In this method, only one antenna module is used for the reception to predict the best beam of other antenna modules. As such, unmasked antenna modules and their corresponding beam pairs can be rapidly selected for switching to avoid the problem of poor quality or disconnection of communications caused by hand blockage. Thorough analysis and extensive simulations, which include the derivation of relevant Cramér-Rao lower bounds, show that the performance of Fast-ABS is close to that of an oracle solution that can instantaneously identify the best beam of other antenna modules even in complex multipath scenarios. Furthermore, Fast-ABS is implemented on a software defined radio and integrated into a 5G New Radio physical layer. Over-the-air experiments reveal that Fast-ABS can achieve efficient and seamless connectivity despite hand blockage.

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“…In [22], [23], channel estimation was performed in the time-frequency domain, and it was found that this estimation incurs higher implementation complexity than the delay-Doppler channel estimation performed in [24], [25]. For massive MIMO-OTFS systems, the authors in [26] proposed an uplink-aided channel estimation algorithm. In [27], after proving that the 3D channel is sparse, the sparsity was exploited to estimate the channel as a sparse recovery problem.…”

Section: Introductionmentioning

confidence: 99%

Downlink Synchronization for OTFS-Based Cellular Systems in High Doppler Environments

et al. 2021

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This paper proposes a downlink synchronization and cell identity (CID) estimation technique for cellular systems based on orthogonal time-frequency space (OTFS). In the proposed technique, each base station (BS) transmits one detection preamble (DP) and two OTFS symbols (pilot and secondary-CID (SCID) signal (SS)). The DP based on a linear frequency-modulated (LFM) waveform, called proposed-LFM (pLFM), carries the primary-CID (PCID) for symbol timing (ST) synchronization, whereas the SS based on the Zadoff-Chu (ZC) sequence mapped in the delay-Doppler domain carries the SCID. The pLFM is obtained by discretizing the LFM waveform, increasing the frequency sweeping parameter beyond the limit of the operational bandwidth, and incorporating the PCID into the LFM waveform. The autocorrelation and cross-correlation functions of the pLFM are analyzed to examine its correlation properties under the influence of a high Doppler shift. To reduce the undesirable correlation properties (side peak and time ambiguity), a receiver processing (RP) scheme is developed for the pLFM. It is found that the pLFM with RP is suitable for the DP design because it can provide an accurate ST in high-mobility scenarios. In addition, the influence of OTFS modulation on the ZC sequence is derived and a low-complexity detection algorithm based on message passing is applied to detect SCID at the user equipment. The simulation results demonstrate that the proposed downlink synchronization and CID estimation techniques are suitable for OTFS-based cellular systems in high-Doppler environments.

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Uplink-Aided High Mobility Downlink Channel Estimation Over Massive MIMO-OTFS System

Cited by 144 publications

References 29 publications

Performance Analysis of OTFS-based Uplink Massive MIMO with ZF Receivers

Performance Analysis of OTFS-based Uplink Massive MIMO with ZF Receivers

Fast Antenna and Beam Switching Method for mmWave Handsets with Multiple Subarrays

Downlink Synchronization for OTFS-Based Cellular Systems in High Doppler Environments

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