WOLA-OFDM: A Potential Candidate for Asynchronous 5G

Zayani, Rafik; Medjahdi, Yahia; Shaïek, Hmaied; Roviras, Daniel

doi:10.1109/glocomw.2016.7849087

Cited by 84 publications

(37 citation statements)

References 8 publications

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“…Therefore, it has drawn significant attention from academia and industry. The authors in [21] investigated the performance of W-OFDM in the presence of carrier frequency offset and timing offset, the study revealed that W-OFDM offers robustness to asynchronism. On the other hand, great efforts have been taken to improve the performance and flexibility for W-OFDM.…”

Section: Introductionmentioning

confidence: 99%

Mixed Numerologies Interference Analysis and Inter-Numerology Interference Cancellation for Windowed OFDM Systems

Zhang

Xiao

et al. 2018

IEEE Trans. Veh. Technol.

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Section: Introductionmentioning

confidence: 99%

Mixed Numerologies Interference Analysis and Inter-Numerology Interference Cancellation for Windowed OFDM Systems

Zhang

Xiao

et al. 2018

IEEE Trans. Veh. Technol.

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“…The operation blocks special to the WOLA‐OFDM system are surrounded by the dashed line. The operations carried out in these blocks are explained visually in Figure . Unlike the classical OFDM in which the usage of rectangular pulse shape gives rise to spectral regrowth, in the WOLA‐OFDM scheme, the adjacent time domain symbols are multiplied by a windowing function possessing a soft‐edged pulse shape in order to obtain the time domain symbols with soft transitions that provide an effective suppression in the OOB emission.…”

Section: Wola‐ofdm System Descriptionmentioning

confidence: 99%

“…Weighted overlap and add‐orthogonal frequency division multiplexing (WOLA‐OFDM), which is also named windowed‐OFDM (W‐OFDM), has been presented to the science world very recently, and it has taken part in the exclusive waveforms seriously considered for being used in the fifth generation (5G) telecommunication systems. Attractive features such as possessing powerful out of band (OOB) suppression capability by using a quite simple but effective time domain windowing operation, being robust to user asynchronism issue and being compatible with multiple input multiple output (MIMO) applications, render the WOLA‐OFDM a promising 5G waveform candidate …”

Section: Introductionmentioning

confidence: 99%

Dual symbol optimization‐based partial transmit sequence technique for PAPR reduction in WOLA‐OFDM waveform

Taşpınar

Şimşir

2019

Int J Communication

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Weighted overlap and add-orthogonal frequency division multiplexing (WOLA-OFDM) is a new waveform proposed recently for meeting the requirements of fifth generation (5G) telecommunication standards. In spite of being a serious 5G waveform candidate, WOLA-OFDM is exposed to the problem of high peak to average power ratio (PAPR) similar to the other waveforms in which multicarrier transmission strategy is employed. Due to the overlapping nature of WOLA-OFDM waveform, where the extension of the current symbol is overlapped with the extension of the previous symbol, it will not be efficient to apply conventional PTS (C-PTS) directly to the WOLA-OFDM waveform. Therefore, in this paper, we propose dual symbol optimization-based partial transmit sequence (DSO-PTS) technique for PAPR reduction in WOLA-OFDM waveform. In our proposed technique, two adjacent symbols are jointly considered when searching for the optimal data block with minimum PAPR unlike the C-PTS where the adjacent symbols are optimized individually. In the simulations, our proposed DSO-PTS technique, C-PTS, and GreenOFDM that is developed recently by modifying the conventional selective mapping (SLM) method are compared with each other with regard to PAPR reduction performance for different search numbers (SNs). In addition, the effects of DSO-PTS, C-PTS, and GreenOFDM on the amount of out of band (OOB) radiation in the power spectral density (PSD) graph of WOLA-OFDM employing solid state power amplifier (SSPA) is measured for different SNs and input back off (IBO) values. According to the simulation results, our proposed DSO-PTS technique clearly demonstrates a superior PAPR reduction and PSD performance.

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“…At the end, for compatibility reasons, simple variants around the 4G Orthogonal Frequency Division Multiplexing (OFDM) scheme could be preferred. In particular, the Weighted Overlap and Add (WOLA)-OFDM system [1], [2] has gained a large interest into the the 3GPP standardization community. Indeed, similarly to CP-OFDM, it guarantees low computational complexity and latency.…”

Section: Introductionmentioning

confidence: 99%

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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WOLA-OFDM: A Potential Candidate for Asynchronous 5G

Cited by 84 publications

References 8 publications

Mixed Numerologies Interference Analysis and Inter-Numerology Interference Cancellation for Windowed OFDM Systems

Mixed Numerologies Interference Analysis and Inter-Numerology Interference Cancellation for Windowed OFDM Systems

Dual symbol optimization‐based partial transmit sequence technique for PAPR reduction in WOLA‐OFDM waveform

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

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