Pilot-based channel estimation for FBMC/OQAM systems under strong frequency selectivity

Mestre, Xavier; Kofidis, Eleftherios

doi:10.1109/icassp.2016.7472367

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…We calculate the pseudo pilot magnitude by substitute (9) and the proposed M-IAM scheme into (15). At odd-indexed subcarrier the pseudo pilot magnitude is given by:…”

Section: A Proposed Modified Iam (M-iam) Schemementioning

confidence: 99%

“…Channel estimation (CE) methods of FBMC attract numerous researches, especially in multipath fading channels [10]. FBMC CE methods include preamble-based [11]- [13] and scattered pilotsbased techniques [11], [14], and [15] techniques. The former ones are supposed to cancel the undesired interference, like interference cancellation method (ICM) or effectively exploiting it to improve the estimation performance, like interference approximation method (IAM) [12].…”

Section: Introductionmentioning

confidence: 99%

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A Modified Interference Approximation Scheme for Improving Preamble Based Channel Estimation Performance in FBMC System

Roshdy¹,

Aboul-Dahab²,

Fouad³

2020

IJCNC

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Filter bank multicarrier (FBMC) is considered a competitive waveform candidate for 5G that can replace orthogonal frequency division multiplexing (OFDM). However, channel estimation (CE) is a big challenge in FBMC because it suffers from intrinsic interference which is due to the orthogonality of the subcarrier functions in the real field only. In this paper, we investigate a proposed modified interference approximation scheme (M-IAM) by approximating the intrinsic interference from the neighbouring pilots to accommodate the complex channel frequency and thus improving CE performance besides simplifying its processing. The M-IAM scheme has a larger pseudo pilot magnitude than other conventional preamble schemes, namely the interference approximation method (IAM) with its versions (IAM-C) and (E-IAM-C); in addition to the novel preamble design (NPS). In addition, the proposed (M-IAM) scheme is characterized by the lower transmitted power needed. The CE performance of the M-IAM is investigated through 512 and 2048 subcarriers via different types of outdoor and indoor multipath fading channels that are timeinvariant such as IEEE 802.22, IEEE 802.11, Rician, and additive white Gaussian noise (AWGN), as well as time-varying channels such as Rayleigh and Vehicular A (Veh-A). Simulation results demonstrate that the proposed M-IAM scheme achieves a lower bit error rate (BER), lower normalized mean square error (NMSE) and lower peak-to-average power ratio (PAPR) over the conventional preamble schemes under the aforementioned channel models. The proposed scheme has the advantage of saving the transmitted power, a requirement that could match 5G low power requirements. KEYWORDSFilter bank multicarrier (FBMC), intrinsic interference, preamble based channel estimation methods

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“…We calculate the pseudo pilot magnitude by substitute (9) and the proposed M-IAM scheme into (15). At odd-indexed subcarrier the pseudo pilot magnitude is given by:…”

Section: A Proposed Modified Iam (M-iam) Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Modified Interference Approximation Scheme for Improving Preamble Based Channel Estimation Performance in FBMC System

Roshdy¹,

Aboul-Dahab²,

Fouad³

2020

IJCNC

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“…In this section, we concisely present the state-of-the-art in channel estimation for MIMO-FBMC/OQAM. Scattered pilots-based techniques are of special interest in fast fading environments, where they allow tracking the channel variations throughout the frame (see, e.g., [110] and references therein). Since the MIMO designs presented in this paper are not suited to time-varying channels, this section only reviews preamble-based techniques.…”

Section: Channel Estimation In Mimo-fbmc/oqam Systemsmentioning

confidence: 99%

MIMO Signal Processing in Offset-QAM Based Filter Bank Multicarrier Systems

Pérez-Neira

Caus

Zakaria

et al. 2016

IEEE Trans. Signal Process.

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101

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“…Due to the OQAM modulation and the MIMO scenario, the pilot symbols may be impacted by ISI, ICI and interantenna interference. Many works in the literature have looked at this issue, see [32] for a general review or [33], [34] for more recent works on the challenges and solutions in pilotaided channel estimation for FBMC-OQAM systems.…”

Section: B Channel Model and Prototype Pulsesmentioning

confidence: 99%

Parallel Equalization Structure for MIMO FBMC-OQAM Systems Under Strong Time and Frequency Selectivity

Rottenberg

Mestre

Petrov

et al. 2017

IEEE Trans. Signal Process.

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Offset-QAM-based filterbank multicarrier (FBMC-OQAM) has been shown to be a promising alternative to cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) for the future generation of wireless communication systems. Unfortunately, as the channel gets more selective in time and frequency, the FBMC-OQAM orthogonality is progressively destroyed and distortion appears after the demodulation process at the receiver. While channel frequency selectivity has been very widely studied in the FBMC literature, the impact of time selectivity of the channel has not received that much attention. In this paper, the effect of the two types of selectivity on a multiple-input multiple-output (MIMO) FBMC system is characterized and a parallel equalization structure that can compensate for the doubly dispersive nature of the channel is proposed. This design uses multiple analysis filterbanks (AFB) and extends previous approaches that were dealing only with channel frequency selectivity. A th... Abstract-Offset-QAM-based filterbank multicarrier (FBMC-OQAM) has been shown to be a promising alternative to cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) for the future generation of wireless communication systems. Unfortunately, as the channel gets more selective in time and frequency, the FBMC-OQAM orthogonality is progressively destroyed and distortion appears after the demodulation process at the receiver. While channel frequency selectivity has been very widely studied in the FBMC literature, the impact of time selectivity of the channel has not received that much attention. In this paper, the effect of the two types of selectivity on a multipleinput multiple-output (MIMO) FBMC system is characterized and a parallel equalization structure that can compensate for the doubly dispersive nature of the channel is proposed. This design uses multiple analysis filterbanks (AFB) and extends previous approaches that were dealing only with channel frequency selectivity. A theoretical approximation of the remaining distortion after equalization is given. The study is performed for a general MIMO system but can also be particularized to single-input single-output (SISO) systems. Simulation results demonstrate the high efficiency of the proposed receiver structure and the accuracy of the theoretical approximations is verified.article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.

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Pilot-based channel estimation for FBMC/OQAM systems under strong frequency selectivity

Cited by 11 publications

References 15 publications

A Modified Interference Approximation Scheme for Improving Preamble Based Channel Estimation Performance in FBMC System

A Modified Interference Approximation Scheme for Improving Preamble Based Channel Estimation Performance in FBMC System

MIMO Signal Processing in Offset-QAM Based Filter Bank Multicarrier Systems

Parallel Equalization Structure for MIMO FBMC-OQAM Systems Under Strong Time and Frequency Selectivity

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