Effect of carrier frequency offset and symbol timing offset on the performance of FMT over time‐frequency selective channels

Zheng, Jing; Wang, Zulin

doi:10.1002/ett.1544

Cited by 4 publications

(1 citation statement)

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“…In FBMC that recently attracts attention for using in the future communication systems [5]- [8], the prototype filters with well-localised pulse shapes in time and frequency are used instead of rectangular window. The authors in [3], [9] and [10] have shown that the FBMC systems produce much better performance than OFDM system against time and frequency variations because of using well-localised pulse shaping. For example, in acoustic underwater channel that is very time variable, FBMC can be used, effectively [11].…”

Section: Introductionmentioning

confidence: 99%

Prototype filter design for FBMC systems via evolutionary PSO algorithm in highly doubly dispersive channels

Tabatabaee

Zamiri-Jafarian

2016

Trans. Emerging Tel. Tech.

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This paper proposes a new prototype filter design method based on the time‐frequency constellation for filter bank multicarrier (FBMC) systems in highly doubly dispersive channels. Maximal spectral efficiency, complex orthogonality and a well‐localised pulse shaping in time and frequency domains are three criteria in the prototype filter design. Satisfying these criteria simultaneously is a challenging issue in the FBMC system design. In order to meet these criteria as much as possible, we consider an FBMC system in which the complex‐valued data symbols are transmitted via a selected time‐frequency constellation with maximal spectral efficiency. Based on the selected constellation and channel statistic properties, the prototype filter is designed by maximising a new utility function called signal to weighted interference ratio (SWIR), which is defined according to the channel time and frequency dispersions. Because the SWIR is a nonlinear utility function, its maximisation is not straightforward. In this paper, for prototype filter design, a reliable, robust and fast converging algorithm called evolutionary cooperatively coevolving particle swarm optimisation is used to maximise the SWIR. The FBMC system, which uses the proposed prototype filter design method, can be combined with the MIMO techniques efficiently because of its capability of sending complex‐valued symbols. Simulation results show that the performance and bandwidth efficiency of the proposed method are superior to those of other techniques, for both cases of single antenna and multiple antennas, in highly doubly dispersive channels. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Prototype filter design for FBMC systems via evolutionary PSO algorithm in highly doubly dispersive channels

Tabatabaee

Zamiri-Jafarian

2016

Trans. Emerging Tel. Tech.

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Time-Frequency Localization optimization of PR FMT: Case of an overlapping factor equal to 2

Pinchon

Siohan²

2020

Signal Processing

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In this paper, we analyze the perfect reconstruction property of Filtered MultiTone (FMT) systems with overlapping factor equal to 2. If small overlapping factors are not common for FMT systems that originally targeted nearly perfect subchannels isolation, we show that they can provide pretty good results when the optimization is carried out with the Time-Frequency Localization (TFL) criterion. Furthermore, it appears that the TFL criterion can ease the treatment of the PR equations. In this respect, our study exhibits nearly optimal TFL results and also leads to a simple and interesting closed form expression for the PR FMT prototype filter coefficients. Numerical results and illustrations are also provided showing the good behavior of our proposed design method in terms of TFL performance and computational complexity.dual RRC (dRRC) [3], this waveform is nearly optimal when considering the Time-Frequency Localization (TFL) criterion.Since the mid-nineties and a famous publication about Coded OFDM systems [4], the TFL criterion is considered as a highly relevant objective function for the design of multicarrier (MC) systems for transmission over time and frequency dispersive channels. Furthermore, as it naturally leads to compact waveforms in time and frequency, for a given transmission performance, the resulting computational complexity is relatively low. In [3], we provided Optimal TFL (OTFL) windows with duration limited, as also the case for WOLA-OFDM, to one CP-OFDM symbol, i.e. an overlapping factor equal to 1. Such a short time window can be also considered as the prototype filter for Filtered MultiTone (FMT) systems satisfying the Perfect Reconstruction (PR) property. With this PR FMT scheme, differently from the original FMT system [5], there is no overlapping in time but in frequency. So this MC system also received other names as, for instance, Weighted Cyclic Prefix (WCP)-OFDM in [6] or Pulse-Shaped OFDM in [7]. Here, for simplicity, we keep the FMT denomination for all these types of MC systems in which waveform overlapping may occur in time and/or in frequency. As recalled in [7], even if the shortest windows are preferred for the enhanced mobile broadband (eMBB) service, given the large extent of other envisioned services in 5G, the requirements may vary accordingly and waveform constraints too. For instance, massive Machine Type Communication (mMTC) does not necessarily require short packet transmission and then longer waveforms are of interest if they can bring some improvements. In this sense, in this paper, we propose a new FMT system with a prototype filter the length of which has a duration equal to two MC symbols,i.e. an overlapping factor equal to 2.Denoting by M its number of subcarriers and N its expansion/decimation factor, that means we focus on the design of a prototype filter with length L = 2N . We also constrain this FMT system to fulfill the PR property. As the Spectral Efficiency (SE) is a key parameter for transmission systems, this has resulted sometimes before to only consider...

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Design of VDES Ground Subsystem Based on Filtered Multitone Modulation

Wang

et al. 2019

2019 International Conference on Internet of Things (iThings) and IEEE Green Computing and Communications (GreenCom) and IEEE C

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Effect of carrier frequency offset and symbol timing offset on the performance of FMT over time‐frequency selective channels

Cited by 4 publications

References 29 publications

Prototype filter design for FBMC systems via evolutionary PSO algorithm in highly doubly dispersive channels

Prototype filter design for FBMC systems via evolutionary PSO algorithm in highly doubly dispersive channels

Time-Frequency Localization optimization of PR FMT: Case of an overlapping factor equal to 2

Design of VDES Ground Subsystem Based on Filtered Multitone Modulation

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