Novel Peak-to-Average Power Ratio Reduction Methods for OFDM/OQAM Systems

Sandeep, V. M.; Anuradha, S.

doi:10.4218/etrij.16.0116.0272

Cited by 7 publications

(7 citation statements)

References 19 publications

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“…There are M=16 data blocks randomly generated in a frame with 16QAM and the PAPR observation interval is set to be T. We adopt PHYDYAS filter [34] as the prototype filter ( ) p t and the length of ( ) p t is KT with overlapping factor 4 K = . For comparison, CC-TR [25], OS-TR [28] and SI LP-FBMC [33] are considered under a common IDFT-PPN structure.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

“…are scaling factors at the ith iteration. The optimal ( ) i m ρ in ( 28) is calculated by least squares method [28], which is 0 0 ( )…”

Section: Proposed Cs-tr Papr Reduction Scheme With Si Embeddedmentioning

confidence: 99%

“…Hence, the proposed scheme requires M(4Nlog2N+8KN)+4MI(2Nlog2N+2KN)+2MKI RMs in one frame at the transmitter. Complexity comparison of PAPR reduction for original FBMC signals, CC-TR [25], OS-TR [28], SI embedded LP-FBMC [33] and the proposed CS-TR are shown in Table 2. From Table 2, it can be seen that the required RMs of CS-TR, OS-TR and CC-TR methods vary with iterative numbers I at the transmitter.…”

Section: Complexity Of Papr Reductionmentioning

confidence: 99%

“…For the clipping method in [24], the BER performance degrades because of signal distortion with hard clipping. The TR scheme in [25][26][27][28] is an attractive technique without signal distortion and SI transmission, which reserved some subcarriers as peak reduction tones (PRTs) and generated peak reduction signal to mitigate PAPR. Conventional clipping based TR (CC-TR) [25], sliding window tone reservation (SW-TR) [26] and multi-block TR (MB-TR) [27] schemes were presented to reduce PAPR with large number of iterations required.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional clipping based TR (CC-TR) [25], sliding window tone reservation (SW-TR) [26] and multi-block TR (MB-TR) [27] schemes were presented to reduce PAPR with large number of iterations required. In order to improve convergence speed, the overlapping scaling TR (OS-TR) [28] was designed by weighting an optimal scaling factor to approximate the peak-cancelling signal, which effectively reduced PAPR with small number of iterations. Nevertheless, the PAPR is still high and the BER performance degrades for FBMC systems.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Shift Based Tone Reservation PAPR Reduction Scheme with Embedding Side Information for FBMC-OQAM Systems

2021

KSII TIIS

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The tone reservation (TR) scheme is an attractive method to reduce peak-to-average power ratio (PAPR) in the filter bank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM) systems. However, the high PAPR of FBMC signal will severely degrades system performance. To address this issue, a cyclic shift based TR (CS-TR) scheme with embedding side information (SI) is proposed to reduce the PAPR of FBMC signals. At the transmitter, four candidate signals are first generated based on cyclic shift of the output of inverse discrete Fourier transform (IDFT), and the SI of the selected signal with minimum peak power among the four candidate signals is embedded in sparse symbols with quadrature phase-shift keying constellation. Then, the TR weighted by optimal scaling factor is employed to further reduce PAPR of the selected signal. At the receiver, a reliable SI detector is presented by determining the phase rotation of SI embedding symbols, and the transmitted data blocks can be correctly demodulated according to the detected SI. Simulation results show that the proposed scheme significantly outperforms the existing TR schemes in both PAPR reduction and bit error rate (BER) performances. In addition, the proposed scheme with detected SI can achieve the same BER performance compared to the one with perfect SI.

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Section: Simulation Results and Analysismentioning

confidence: 99%

“…are scaling factors at the ith iteration. The optimal ( ) i m ρ in ( 28) is calculated by least squares method [28], which is 0 0 ( )…”

Section: Proposed Cs-tr Papr Reduction Scheme With Si Embeddedmentioning

confidence: 99%

Section: Complexity Of Papr Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Shift Based Tone Reservation PAPR Reduction Scheme with Embedding Side Information for FBMC-OQAM Systems

2021

KSII TIIS

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Performance evaluation of hybrid transform for universal filtered multi‐carrier system

Chintala¹,

Suddapalli²,

Anuradha

2022

Trans Emerging Tel Tech

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High peak to average power ratio (PAPR) is viewed as a serious limitation of all multi‐carrier systems. In this article, a companding transform with clipping technique is proposed for universal filtered multi‐carrier (UFMC) system. The proposed companding transform successfully reduces the PAPR by expanding the small amplitude signals and compressing the peak amplitude signals. Moreover, the combination of companding and clipping further reduces the PAPR. Besides, the proposed scheme provides more flexibility by properly selecting companding parameters and clipping ratio (CR). Additionally, this article presents the performance evaluation of various nonlinear companding transforms (NCTs) of the UFMC system in terms of PAPR reduction, bit‐error‐rate, and reduced out‐of‐band emissions. Simulation results confirm that the proposed hybrid transform provides superior system performance when compared to other NCTs. The proposed hybrid transform with CR of 1.4 provides superior PAPR diminution of 8.5 dB and net gain of 8.9 dB when compared to other schemes. Finally, the proposed hybrid transform is validated by using wireless‐open access‐research platform over real time channel.

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Quadrature Frequency-Group Radar and its center estimation algorithms for small Vibrational Displacement

Kim

2019

Sci Rep

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The quadrature continuous-wave (QCW) radar has been extensively studied for small vibrational displacement detection such as non-contact sensing of human vital signals. One of the challenges of the QCW radar is the IQ-imbalance and DC-offset estimation by using curve fitting algorithms. Many algorithms have been proposed and have shown that the fitting error increases when the displacement length is small, in which case sufficient data is not provided to the algorithms. This paper presents a quadrature frequency-group (QFG) radar which utilizes a group of frequencies to enhance the fitting performance even with the small displacement. The grouped-frequencies in the QFG radar gives more data than the single-tone of the QCW radar under the same displacement condition. This paper presents the framework and properties of the QFG radar. Some fitting algorithms for the QFG radar are presented and the most adequate algorithm is suggested by simulation and experiments. Simulation and experimental results shows that the QFG radar outperforms the QCW radar. Specifically, it is shown that the fitting accuracy of the QFG radar is up to 100 times better than the QCW radar in the experiment.

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Novel Peak-to-Average Power Ratio Reduction Methods for OFDM/OQAM Systems

Cited by 7 publications

References 19 publications

Cyclic Shift Based Tone Reservation PAPR Reduction Scheme with Embedding Side Information for FBMC-OQAM Systems

Cyclic Shift Based Tone Reservation PAPR Reduction Scheme with Embedding Side Information for FBMC-OQAM Systems

Performance evaluation of hybrid transform for universal filtered multi‐carrier system

Quadrature Frequency-Group Radar and its center estimation algorithms for small Vibrational Displacement

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