Channel Estimation and Equalization for Terahertz Receiver With RF Impairments

Sha, Ziyuan; Hanzo, Lajos

doi:10.1109/jsac.2021.3071824

Cited by 31 publications

(20 citation statements)

References 42 publications

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“…More importantly, their estimation Andrews [14] have considered generative adversarial networks for channel estimation in an OFDM-based THz hybrid MIMO system. On the other hand, Sha and Wang [16] derived a CSI estimation and equalization technique for a single-carrier THz SISO system accounting also for realistic RF impairments.…”

Section: A Related Work and Contributionsmentioning

confidence: 99%

“…The optimal design of the phase shift matrix at the IRS has been determined in their work based on the BS to IRS and IRS to user equipment (UE) THz MIMO channels. Recent treatises, such as[14]-[16], address the problem of wideband CSI acquisition in THz systems. Specifically, Dovelos et al[15] consider an orthogonal frequency division multiplexing (OFDM)-based THz hybrid MIMO system and develop orthogonal matching pursuit (OMP)-based techniques for CSI estimation.Balevi and…”

mentioning

confidence: 99%

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Hybrid Transceiver Design for Tera-Hertz MIMO Systems Relying on Bayesian Learning Aided Sparse Channel Estimation

Srivastava¹,

Tripathi²,

Varshney³

et al. 2021

Preprint

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Hybrid transceiver design in multiple-input multiple-output (MIMO) Tera-Hertz (THz) systems relying on sparse channel state information (CSI) estimation techniques is conceived. To begin with, a practical MIMO channel model is developed for the THz band that incorporates its molecular absorption and reflection losses, as well as its non-line-of-sight (NLoS) rays associated with its diffused components.Subsequently, a novel CSI estimation model is derived by exploiting the angular-sparsity of the THz MIMO channel. Then an orthogonal matching pursuit (OMP)-based framework is conceived, followed by designing a sophisticated Bayesian learning (BL)-based approach for efficient estimation of the sparse THz MIMO channel. The Bayesian Cramer-Rao Lower Bound (BCRLB) is also determined for benchmarking the performance of the CSI estimation techniques developed. Finally, an optimal hybrid transmit precoder and receiver combiner pair is designed, which directly relies on the beamspace domain CSI estimates and only requires limited feedback. Finally, simulation results are provided for quantifying the improved mean square error (MSE), spectral-efficiency (SE) and bit-error rate (BER) performance for transmission on practical THz MIMO channel obtained from the HIgh resolution TRANsmission (HITRAN)-database.

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Section: A Related Work and Contributionsmentioning

confidence: 99%

mentioning

confidence: 99%

Hybrid Transceiver Design for Tera-Hertz MIMO Systems Relying on Bayesian Learning Aided Sparse Channel Estimation

Srivastava¹,

Tripathi²,

Varshney³

et al. 2021

Preprint

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“…When there are multiple impairments to be compensated in a system, it is prudent to consider joint equalization for efficient realization [22]. We have recently demonstrated one such joint equalization method to track the phase noise, polarization, and IQ imbalance compensation using complex Modified-WLF [23].…”

Section: Introductionmentioning

confidence: 99%

Widely Linear Filtering for Multiimpairment Compensation in Dispersion Managed mQAM Modulated Optical Systems

Yadav¹,

Venkatasubramani²,

Koilpillai³

et al. 2022

Preprint

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We propose a blind joint equalization algorithm for M-QAM signals based on a widely linear filtering approach. The proposed scheme jointly compensates receiver IQ imbalance and polarization mixing, along with carrier recovery, followed by transmitter IQ imbalance compensation. We first investigate the proposed scheme's tolerance to transceiver IQ Imbalance, polarization mixing, phase noise and frequency offset through numerical simulations for 32 GBd PM-16QAM and PM-64QAM signals and compare its performance with the conventional digital processing algorithms. Further, with the proposed algorithm, we experimentally demonstrate the improvement in Q<sup>2</sup> value to up to ~ 1.22 dB for a 32 GBd PM-16QAM and ~ 3.72 dB for a 16 GBd PM-64QAM signal with a phase imbalance of 9<sup>o</sup>. We show that the MSE convergence of the proposed joint equalizer is much faster than conventional DSP algorithms. Deployment of such an equalizer in optical communication systems is beneficial due to its improved tolerance to multiple impairments, albeit with increased complexity.

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“…Furthermore, hardware imperfections and radio frequency (RF) impairments critically impact THz WF design, where candidate THz materials/hardware are still under development. Hardware imperfections include PA non-linearity, wideband in/quadrature-phase imbalance (IQI) [40], phase uncertainty in the phase-shifters (PSs) [41], and PHN (studied for SC schemes [42] and CP-OFDM [43] in sub-THz and THz [40] systems). THz channelinduced phenomena such as beam split and misalignment [44] are also critical, especially with UM-MIMO systems.…”

Section: Introductionmentioning

confidence: 99%

“…Subcarrier spacing (SCS), its impact on PHN, and the design of phase-tracking reference signals are studied in [45], [46] to assess whether CP-OFDM and DFT-s-OFDM can support mmWave and sub-THz communications. Moreover, a THz SC frequency-domain equalization technique (SC-FDE) is developed in [40], and a pilot design strategy based on index modulation is proposed in [47]. SC systems are found superior to CP-OFDM in mmWave systems [48].…”

Section: Introductionmentioning

confidence: 99%

Single- versus Multi-Carrier Terahertz-Band Communications: A Comparative Study

Tarboush¹,

Sarieddeen²,

Alouini³

et al. 2021

Preprint

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The prospects of utilizing single-carrier (SC) and multi-carrier (MC) waveforms in future terahertz (THz)-band communication systems remain unresolved. On the one hand, the limited multi-path (MP) components at high frequencies result in frequency-flat channels that favor low-complexity wideband SC systems. On the other hand, frequency-dependent molecular absorption and transceiver characteristics and the existence of MP components in indoor sub-THz systems can still result in frequency-selective channels, favoring off-the-shelf MC schemes such as orthogonal frequency-division multiplexing (OFDM). Variations of SC/MC designs result in different THz spectrum utilization, but spectral efficiency is not the primary concern with substantial available bandwidths; baseband complexity, power efficiency, and hardware impairment constraints are predominant. This paper presents a comprehensive study of SC/MC modulations for THz communications, utilizing an accurate wideband THz channel model and highlighting the various performance and complexity trade-offs of the candidate schemes. Simulations demonstrate the robustness of discrete-Fourier-transform spread OFDM (DFT-s-OFDM) to THz impairments and orthogonal time-frequency space (OTFS) to THz Doppler spreads.

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Channel Estimation and Equalization for Terahertz Receiver With RF Impairments

Cited by 31 publications

References 42 publications

Hybrid Transceiver Design for Tera-Hertz MIMO Systems Relying on Bayesian Learning Aided Sparse Channel Estimation

Hybrid Transceiver Design for Tera-Hertz MIMO Systems Relying on Bayesian Learning Aided Sparse Channel Estimation

Widely Linear Filtering for Multiimpairment Compensation in Dispersion Managed mQAM Modulated Optical Systems

Single- versus Multi-Carrier Terahertz-Band Communications: A Comparative Study

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