Efficient Fast-Convolution Based Hybrid Carrier System

Lin, Xu; Mei, Lin; Labeau, Fabrice; Sha, Xuejun; Fang, Xiaojie

doi:10.1109/twc.2021.3122880

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…(Corresponding author: Juha Yli-Kaakinen.) Juha Yli-Kaakinen, Markku Renfors, and Mikko Valkama are with the Department of Electrical Engineering, Tampere University, FI-33101 Tampere, Finland (e-mail: {juha.yli-kaakinen; markku.renfors; mikko.valkama}@tuni.fi) Toni Levanen and Arto Palin are with Nokia Networks, 33100 Tampere, Finland (e-mail: {toni.a.levanen; arto.palin}@nokia.com) Fast-convolution (FC)-based filtering has been recently proposed as an efficient tool for spectrum control of singecarrier and multi-carrier waveforms [7]- [18]. In general, the objective of the filtering is to improve the spectral utilization of the channel by improving the localization of the waveform in frequency direction, that is, maximizing the transmission bandwidth for a given channel bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Flexible fast-convolution processing for cellular radio evolution

Yli‐Kaakinen¹,

Levanen²,

Palin³

et al. 2022

Preprint

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Orthogonal frequency-division multiplexing (OFDM) has been selected as a baseline waveform for long-term evolution (LTE) and fifth-generation new radio (5G NR). Fast-convolution (FC)-based frequency-domain signal processing has been considered recently as an effective tool for spectrum enhancement of OFDM-based waveforms. FC-based filtering approximates linear convolution by effective fast Fourier transform (FFT)-based circular convolutions using partly overlapping processing blocks. In earlier work, we have shown that FC-based filtering is a very flexible and efficient tool for filtered-OFDM signal generation and receiver side subband filtering. In this paper, we present a symbol-synchronous FCprocessing scheme flexibly allowing filter re-configuration time resolution equal to one OFDM symbol while supporting tight carrier-wise filtering for 5G NR in mixed-numerology scenarios with adjustable subcarrier spacings, center frequencies, and subband bandwidths as well as providing co-exitence with LTE. The proposed scheme is demonstrated to support envisioned use cases of 5G NR and provide flexible starting point for sixth generation development.

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Section: Introductionmentioning

confidence: 99%

Flexible fast-convolution processing for cellular radio evolution

Yli‐Kaakinen¹,

Levanen²,

Palin³

et al. 2022

Preprint

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“…Fast-convolution (FC)-based filtering has been recently proposed as an efficient tool for spectrum control of singe-carrier and multi-carrier waveforms [7]- [18]. FC-based filter-bank solutions have superior flexibility when compared with the conventional time-domain polyphase-type filter banks [19].…”

Section: Introductionmentioning

confidence: 99%

Flexible Fast-Convolution Processing for Cellular Radio Evolution

Yli‐Kaakinen

Levanen

Palin

et al. 2022

IEEE Trans. Commun.

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Orthogonal frequency-division multiplexing (OFDM) has been selected as a baseline waveform for long-term evolution (LTE) and fifth-generation new radio (5G NR). Fast-convolution (FC)-based frequency-domain signal processing has been recently considered as an effective tool for transmitter and receiver side subband filtering of OFDM-based waveforms. However, for the original continuous FC-based model, the filtering can, in general, be configured in time-direction only with the granularity of half subframe, corresponding to 7, 14, or 28 symbols with 15 kHz, 30 kHz, or 60 kHz subcarrier spacing, respectively. In this paper, we present a symbol-synchronous FC-processing scheme flexibly allowing filter re-configuration with the time resolution equal to one OFDM symbol while supporting tight carrier-wise filtering for 5G NR in mixednumerology scenarios with adjustable subcarrier spacings, center frequencies, and subband bandwidths, as well as providing co-existence with LTE. Proposed approach segments each stream of time-domain OFDM symbols into overlapping processing blocks of fixed size. Symbol synchronous processing is achieved by dynamically adjusting the overlap between the processing blocks while aligning the payload part of the processing block with the boundaries of the OFDM symbols. The proposed scheme is demonstrated to support the envisioned use cases of 5G NR and provide a flexible starting point for sixth generation (6G) development.

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