Novel PAPR Reduction Scheme Based on Piecewise Nonlinear Companding Transform in OFDM Systems

Xing, Zhitong; Liu, Kaiming; Tang, Bihua; Liu, Yuanan

doi:10.1109/lcomm.2020.2993022

Cited by 19 publications

(6 citation statements)

References 13 publications

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“…Later, the convex optimization problems (Pl 2 ∞ ) and (Pl 2 ∞) are solved by employing the iterative scheme that is described in Algorithm 2. Algorithm 2 (SQUID-UFMC): Determine J k and d k for information subcarriers (ie, k ∈ I c ) from Equations ( 32) and (33), respectively. Initialize the matrices Ĉ(0) = 0 B×N and B(0) = 0 B×N .…”

Section: Proposed Squid-ufmc Precodingmentioning

confidence: 99%

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Quantized precoding and companding schemes for PAPR reduction in UFMC‐based massive MIMO downlink systems

Durga

SundruAnuradha

2021

Trans Emerging Tel Tech

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Universal-filtered multi-carrier (UFMC) is a promising waveform technology, which inherits the robustness of FBMC and simplicity of OFDM. In this article, the UFMC waveform is combined with the massive multi-user multiple-input and multiple-output (MU-MIMO) technology to meet the desired needs of future wireless networks. In order to eliminate MU interference (MUI), the precoding is essential in massive MU-MIMO downlink. However, the transmitted signals produced by the precoders have high peak-to-average power ratio (PAPR), thus resulting in reduction of power efficiency of the system. Hence, this article proposes the quantized MU precoding and companding schemes to increase the power efficiency of UFMC-based massive MU-MIMO downlink systems. A nonlinear quantized precoder called squared-infinity norm Douglas-Rachford splitting (SQUID), which generates signals with constant envelope, is proposed. The proposed SQUID precoder reduces the power consumption and MUI of UFMC-based massive MU-MIMO systems. Moreover, a piecewise linear companding (PLC) scheme, which further reduces the PAPR by employing two threshold values and one companding parameter, is also proposed. The simulation results confirm that the proposed UFMC-based massive MU-MIMO with quantized nonlinear SQUID precoding provides better performance than quantized linear precoders. Besides, the proposed system with the PLC scheme offers better PAPR reduction of 4.5 dB when compared with linear nonsymmetrical transform and 𝜇-law schemes.

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Section: Proposed Squid-ufmc Precodingmentioning

confidence: 99%

“…The PSD characteristics of the proposed massive MIMO-UFMC model and the proposed massive MIMO-UFMC model with various companding schemes, such as LNST, LC, 𝜇-law, and the proposed PLC are described in Figure 13. EC (d = 0.7) 33 4.8 1.9 2.9…”

Section: Performance Evaluationmentioning

confidence: 99%

Quantized precoding and companding schemes for PAPR reduction in UFMC‐based massive MIMO downlink systems

Durga

SundruAnuradha

2021

Trans Emerging Tel Tech

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“…Several works of literature are found which discuss about reducing the OOB radiations. In [3], the authors propose a piecewise nonlinear companding scheme for OFDM, to attain a low PAPR. Along with PAPR, a low BER and low OOB radiation are attained.…”

Section: Introductionmentioning

confidence: 99%

Shaped Offset Quadrature Phase Shift Keying Based Waveform for Fifth Generation Communication

Jenifer¹,

Bhagyaveni²,

Malini³

et al. 2023

Intelligent Automation &Amp; Soft Computing

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Fifth generation (5G) wireless networks must meet the needs of emerging technologies like the Internet of Things (IoT), Vehicle-to-everything (V2X), Video on Demand (VoD) services, Device to Device communication (D2D) and many other bandwidth-hungry multimedia applications that connect a huge number of devices. 5G wireless networks demand better bandwidth efficiency, high data rates, low latency, and reduced spectral leakage. To meet these requirements, a suitable 5G waveform must be designed. In this work, a waveform namely Shaped Offset Quadrature Phase Shift Keying based Orthogonal Frequency Division Multiplexing (SOQPSK-OFDM) is proposed for 5G to provide bandwidth efficiency, reduced spectral leakage, and Bit Error Rate (BER). The proposed work is evaluated using a real-time Software Defined Radio (SDR) testbed-Wireless open Access Research Platform (WARP). Experimental and simulation results show that the proposed 5G waveform exhibits better BER performance and reduced Out of Band (OOB) radiation when compared with other waveforms like Offset Quadrature Phase Shift Keying (OQPSK) and Quadrature Phase Shift Keying (QPSK) based OFDM and a 5G waveform candidate Generalized Frequency Division Multiplexing (GFDM). BER analysis shows that the proposed SOQPSK-OFDM waveform attains a Signal to Noise Ratio (SNR) gain of 7.2 dB at a BER of 10 À3 , when compared with GFDM in a real-time indoor environment. An SNR gain of 8 and 6 dB is achieved by the proposed work for a BER of 10 À4 when compared with QPSK-OFDM and OQPSK-OFDM signals, respectively. A significant reduction in OOB of nearly 15 dB is achieved by the proposed work SOQPSK-OFDM when compared to 16 Quadrature Amplitude Modulation (QAM) mapped OFDM.

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“…Both single-carrier signals with multilevel modulation and multi-carrier signals with orthogonal frequency division multiplexing (OFDM) [1,2] have significant drawbacks. Such random signals have a high peak-to-average power ratio (PAPR), reaching a value of more than 10-15 dB.…”

Section: Introductionmentioning

confidence: 99%

A Reduction of Peak-to-Average Power Ratio Based Faster-Than-Nyquist Quadrature Signals for Satellite Communication

et al. 2021

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The increase in the throughput of digital television and radio broadcasting (DVB) channels can be achieved due to application of signals with a compact spectrum and a relatively small peak-to-average power ratio (PAPR). The reason is the usage of traveling wave tubes (TWT) for amplifying and transmitting signals from a satellite repeater in DVB-S2X systems. At the same time, given that the bandwidth allocated for transmission should be used as efficiently as possible, a high reduction rate of out-of-band emissions level is required. The most effective solution in this direction is the transition to spectrum-economic signals, such as optimal Faster-Than-Nyquist (FTN) signals, which can provide a certain reduction rate of the out-of-band emissions level and minimum acceptable PAPR. This article proposes a method for obtaining optimal FTN pulses, which have symmetry in time domain, with specified PAPR and reduction rate of out-of-band emissions for the quadrature phase shift keying (QPSK) and offset quadrature phase shift keying (OQPSK). The possibility of synthesizing signals with OQPSK modulation is presented theoretically for the first time. Optimal FTN signals can provide PAPR reduction by at most 3 dB and outperform known root raised cosine (RRC) pulses. The simulation model adopts an architecture for quadrature generation of optimal FTN signals with OQPSK modulation with blocks for adjustable pre-amplification, clipping, and power amplification. The proposed signals can be used to increase the spectral and energy efficiencies of satellite broadcasting systems, such as DVB-S2/S2X, as well as low-rate return channels of interactive broadcasting systems with a frequency resource shortage.

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Novel PAPR Reduction Scheme Based on Piecewise Nonlinear Companding Transform in OFDM Systems

Cited by 19 publications

References 13 publications

Quantized precoding and companding schemes for PAPR reduction in UFMC‐based massive MIMO downlink systems

Quantized precoding and companding schemes for PAPR reduction in UFMC‐based massive MIMO downlink systems

Shaped Offset Quadrature Phase Shift Keying Based Waveform for Fifth Generation Communication

A Reduction of Peak-to-Average Power Ratio Based Faster-Than-Nyquist Quadrature Signals for Satellite Communication

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