Correlatively Precoded OFDM With Reduced PAPR

Wu, Tsung-Wei; Chung, Char-Dir

doi:10.1109/tvt.2015.2411653

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…The main reason is that keeping power efficiency sufficiently high is usually much more important to UEs than taking large IBO [41]. The VIP averaged over the bth block is defined as [20], [21], [29], [33]…”

Section: B Vip To Measure Pa Efficiencymentioning

confidence: 99%

Circularly Pulse-Shaped Precoding for OFDM: A New Waveform and Its Optimization Design for 5G New Radio

Huang

2018

IEEE Access

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A new circularly pulse-shaped (CPS) precoding orthogonal frequency division multiplexing (OFDM) waveform, or CPS-OFDM for short, is proposed in this paper. CPS-OFDM, characterized by user-specific precoder flexibility, possesses the advantages of both low out-of-subband emission (OSBE) and low peak-to-average power ratio (PAPR), which are two major desired physical layer signal properties for various scenarios in 5G New Radio (NR), including fragmented spectrum access, new types of user equipments (UEs), and communications at high carrier frequencies. As opposed to most of existing waveform candidates using windowing or filtering techniques, CPS-OFDM prevents block extension that causes extra interblock interference (IBI) and envelope fluctuation unfriendly to signal reception and power amplifier (PA) efficiency, respectively. An optimization problem of the prototype shaping vector built in the CPS precoder is formulated to minimize the variance of instantaneous power (VIP) with controllable OSBE power (OSBEP) and noise enhancement penalty (NEP). In order to solve the optimization problem involving a quartic objective function, the majorization-minimization (MM) algorithmic framework is exploited. By proving the convexity of the proposed problem, the globally optimal solution invariant of coming data is guaranteed to be attained via numbers of iterations. Simulation results demonstrate the advantages of the proposed scheme in terms of detection reliability and spectral efficiency for practical 5G cases such as asynchronous transmissions and mixed numerologies.Index Terms-5G, New Radio (NR), new waveform, OFDM, DFT-S-OFDM, circularly pulse-shaped (CPS) precoding, low outof-subband emission (OSBE), low peak-to-average power ratio (PAPR), variance of instantaneous power (VIP), majorizationminimization (MM), convex optimization, transceiver design.Y. Huang and B. Su are 3GPP standardization delegates

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Section: B Vip To Measure Pa Efficiencymentioning

confidence: 99%

Circularly Pulse-Shaped Precoding for OFDM: A New Waveform and Its Optimization Design for 5G New Radio

Huang

2018

IEEE Access

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“…A time-domain iterative algorithm combining time-domain N-continuous OFDM (TD-NC-OFDM) and serial peak cancellation (SPC), aiming at solving both the spectral leakage and PAPR problems to optimize 5G multicarrier waveforms and the projections onto convex sets (POCS) algorithm was applied to prove the effectiveness of the iterative program in the proposed algorithm in [10]. Correlative precoders are designed in [15] to endow correlatively precoded OFDM waveforms with reduced PAPR while preserving enhanced intercarrier interference (ICI) self-cancelation or improved spectral sidelobe suppression, respectively, or jointly. The method aims at the joint utilization of extending the outer constellation points and adding pre-determined tones onto the subcarriers to reduce both PAPR and sidelobe power jointly proposed in [16].…”

Section: Introductionmentioning

confidence: 99%

Joint PAPR and OBP Reduction for NC-OFDM Systems

Wang,

Ueng,

Yeh

2023

IEEE Open J. Signal Process.

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The spectrum resource is always a critical issue for wireless communications since it directly impacts the data rate and capacity. However, the problem of spectrum resource scarcity always exists. Moreover, spectrum resource scarcity becomes more severe as new communication technologies and wireless applications sprout. Noncontiguous orthogonal frequency division multiplexing (NC-OFDM) is a multicarrier method for bandwidth utilization. Unfortunately, this system has two fatal defects: high peak-to-average power ratio (PAPR) and considerable out-of-band power (OBP), which are detrimental to the system's performance. To solve these two problems, we propose a convex optimization-based method for joint PAPR and OBP reduction in NC-OFDM Systems. The strategy is to permit the secondary user to utilize the unoccupied spectrum of the primary user with dynamic spectrum sharing (DSS) based on a cognitive radio network (CRN). To this end, a flexible system operating over noncontiguous bands and DSS scenarios is necessary. The simulation results have shown that our method could effectively improve the overall performance and outperform other schemes, i.e., projections onto convex sets (POCS) and alternating projections onto convex and nonconvex sets (APOCNCS), without harming the transmission of the primary system. The collaboration between secondary and primary systems is viable with the proposed method.

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“…Many OOBE suppression techniques have been studied, e.g. in [1–17]. Some schemes focus on the time‐domain symbols after the Fourier transform, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Some other schemes focus on the frequency‐domain symbols before the Fourier transform, e.g. constellation extension [3], precoding [4–17] etc. Owing to the excellent OOBE suppression performance, precoding techniques have been extensively analysed, e.g.…”

Section: Introductionmentioning

confidence: 99%

High‐performing orthogonal frequency division multiplexing precoding scheme for OOBE suppression

You¹,

Lu²,

Li³

2016

IET Communications

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Correlatively Precoded OFDM With Reduced PAPR

Cited by 11 publications

References 24 publications

Circularly Pulse-Shaped Precoding for OFDM: A New Waveform and Its Optimization Design for 5G New Radio

Circularly Pulse-Shaped Precoding for OFDM: A New Waveform and Its Optimization Design for 5G New Radio

Joint PAPR and OBP Reduction for NC-OFDM Systems

High‐performing orthogonal frequency division multiplexing precoding scheme for OOBE suppression

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