Generalized DFT-s-OFDM Waveforms Without Cyclic Prefix

Berardinelli, Gilberto

doi:10.1109/access.2017.2781122

Cited by 24 publications

(18 citation statements)

References 34 publications

(46 reference statements)

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“…Certain significant improvements gets noticed with the introduction of zero-tail DFT spread OFDM, an internal guard band variant of DFT-S-OFDM. [16][17][18][19][20] Firstly, low zero power head as well as tail entity guarantee a significant out-of-band (OOBE) radiation minimization. Secondly, this enhances smooth and uninterrupted transition between neighboring symbols with different characteristics resulting in harmonious co-existence.…”

Section: Literature Surveymentioning

confidence: 99%

“…This section, hybrid PAPR reduction technique IMBO based PTS with tone reservation-clipping techniques have been implemented on zero-tail DFT-spread-OFDM system. In this study, ZT DFT-S-OFDM approach [17][18][19][20] is implemented a substitute for supplementary OFDM techniques like UW OFDM, F-OFDM, and UFMC etc with possible benefits of…”

Section: Proposed Hybrid Model For Zero-tail Dft-s-ofdmmentioning

confidence: 99%

“…Before‐mentioned signals have been on the high research and development and designed to flexibly interact with different radio numerology and channel conditions by replacing CP having very low power trailing zero samples set (zero‐tail) that gets introduced during the process of Inverse Fast Fourier Transform (IFFT) as in Figure 2. Certain significant improvements gets noticed with the introduction of zero‐tail DFT spread OFDM, an internal guard band variant of DFT‐S‐OFDM 16‐20 . Firstly, low zero power head as well as tail entity guarantee a significant out‐of‐band (OOBE) radiation minimization.…”

Section: Introductionmentioning

confidence: 99%

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Retracted: Peak to average power ratio reduction of ZT DFT‐S‐OFDM signals using hybrid improved monarch butterfly optimization‐PTS scheme with TR‐clipping scheme

Lavanya

Satyanarayana

Mohatram

2021

Int J Communication

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Current research on zero-tail discrete Fourier transform spread OFDM, an add on to conventional discrete Fourier transform DFT-OFDM modulation without cyclic prefix (CP). Its low power tail is configured for coping up with channel's delay spread. Advantageous feature of ZT DFT-S-OFDM has drawn researchers for deploying it as a potential waveform candidate to fifth generation (5G). However, the intrinsic shortcoming of high peak to average power ratio (PAPR) should be alleviated. In order to improve that work, we propose a hybrid PAPR scheme that implements optimized partial transmit sequence (PTS) with tone reservation (TR) with clipping technique. Its earlier work stresses for reducing PTS scheme's computational complexity with enhanced version of monarch butterfly optimization (MBO) for PAPR reduction in ZT DFT-S-OFDM system. The proposed model reduced the correlation among the candidate signals. In this paper, we further reduce PAPR by deploying TR clipping pair, which reduces the influence of clipping noise and decreases ZT DFT-S-OFDM signal's PAPR at same time. The proposed hybrid technique produces excellent PAPR reduction while improving receiver sensitivity and effective throughout. The performance comparison is done using the parameters like PAPR and BER to confirm that this introduced design exceeds current waveforms designs with more economical design structure.clipping, monarch butterfly optimization, partial transmit sequence, peak to average power ration, tone reservation, zero-tail discrete Fourier transform spread OFDM | INTRODUCTIONCommunication systems widely use multicarrier waveforms candidates because of their high data rate transmission and their ease of propagation in multipath fading environments. They are recognized for implementation in future coming wireless systems also. Current mobile wireless standards such as IEEE 802.11, wireless local area networks (WLANs), 4G-(LTE) deployed orthogonal frequency division multiplexing waveform as a vehicle for communication. OFDM has definitely stood itself as a dominant waveform for its use in digital video and audio broadcasting (DAB-DVB). 1 Nevertheless, this waveform has few prolonged implementation issues, the predominating one being the

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Section: Literature Surveymentioning

confidence: 99%

Section: Proposed Hybrid Model For Zero-tail Dft-s-ofdmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Retracted: Peak to average power ratio reduction of ZT DFT‐S‐OFDM signals using hybrid improved monarch butterfly optimization‐PTS scheme with TR‐clipping scheme

Lavanya

Satyanarayana

Mohatram

2021

Int J Communication

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“…The subcarrier orthogonality is lost and the system performance is degraded by the resulting inter-carrier interference (ICI) [11], [13]. This problem is more serious for OFDM systems without CP [14], [15] or with insufficient CP [16], [17]. The ICI should be mitigated to improve the system performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Mitigation of ICI Due to Gain Adjustment in OFDM Systems

2019

IEEE Access

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Automatic gain control (AGC) is widely adopted in orthogonal frequency division multiplexing (OFDM) systems to compensate the significant variation of the received signal. In OFDM systems, the duration of the cyclic prefix (CP) is usually equal to the delay spread of the channel to minimize the system overhead. The inter-symbol interference (ISI) between consecutive OFDM symbols spreads over a large portion of the CP. The CP contaminated by the ISI should not be used to estimate the received power. If the duration of the remaining CP is shorter than the settling time of the AGC, then the gain adjustment will be carried out within the useful portion of the OFDM symbol. The subcarrier orthogonality is lost and the system performance is degraded by the resulting inter-carrier interference (ICI). In this paper, we propose a simple and efficient scheme to mitigate the ICI. The proposed scheme can be easily implemented in actual systems because of its low computational complexity. The simulation results show that the proposed scheme can increase the signal-to-interference-plus-noise ratio significantly compared to the traditional scheme.INDEX TERMS Automatic gain control, inter-carrier interference, inter-symbol interference, orthogonal frequency division multiplexing.

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“…Practically, in most cases of the AF-type cooperative network, CSI cannot be acquired perfectly at the destination nodes, and thus we require additional pilot symbols to achieve precise channel estimation. In addition, since there is a long effective time delay in a source-relay-destination channel, the cyclic prefix (CP) for combating the intersymbol interference (ISI) should be further extended [6,7]. These factors obviously degrade the spectrum efficiency of the considered system.…”

Section: Introductionmentioning

confidence: 99%

CFO/Channel estimation algorithms for space‐time block coded orthogonal frequency division multiplexing wireless relay networks without using cyclic prefix of OFDM

Lin

Hwang

2019

IET signal process.

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This study presents a simple technique, which is used to estimate both channel state and carrier frequency offset (CFO) in decode-and-forward relay systems, where coded orthogonal frequency division multiplexing is employed without cyclic prefix. On the basis of the least-square criterion, we derive the estimate of CFO and channel with the aids of consecutive blocks of pilot symbols. The initially proposed estimation technique achieves a distinguished performance by using a two-dimensional complete search approach; however, the computation becomes more and more intensive when the search granularity becomes finer and finer. For this reason, we further present an iterative approach as an alternative solution, which provides a performance comparable with that of the complete search method, while greatly reducing the implementation complexity. Besides, we also derive a closed-form expression of the CFO estimate for the considered system, which allows us to avoid the exhaustive search during the estimation processing. Computer simulations have been conducted to verify the efficiency of the proposed schemes.

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Generalized DFT-s-OFDM Waveforms Without Cyclic Prefix

Cited by 24 publications

References 34 publications

Retracted: Peak to average power ratio reduction of ZT DFT‐S‐OFDM signals using hybrid improved monarch butterfly optimization‐PTS scheme with TR‐clipping scheme

Retracted: Peak to average power ratio reduction of ZT DFT‐S‐OFDM signals using hybrid improved monarch butterfly optimization‐PTS scheme with TR‐clipping scheme

Analysis and Mitigation of ICI Due to Gain Adjustment in OFDM Systems

CFO/Channel estimation algorithms for space‐time block coded orthogonal frequency division multiplexing wireless relay networks without using cyclic prefix of OFDM

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