Power Backoff Reduction Techniques for Generalized Multicarrier Waveforms

Danilo-Lemoine, F.; Falconer, D.D.; Lam, Chan‐Tong; Sabbaghian, Maryam; Wesołowski, Krzysztof

doi:10.1155/2008/437801

Cited by 24 publications

(16 citation statements)

References 11 publications

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“…Note that the AM/PM of SSPA is zero. 1 In this case, the Rapp's SSPA model introduces only AM/AM distortion, and the output signal of the SSPA can be expressed as:…”

Section: Simulation Resultsmentioning

confidence: 99%

PAPR Reduction via Constellation Extension in OFDM Systems Using Generalized Benders Decomposition and Branch-and-Bound Techniques

Paredes

Escudero-Garzás

García

2016

IEEE Trans. Veh. Technol.

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In this paper, a novel Constellation Extension (CE) based approach is presented to address the high Peak-to-Average Power Ratio (PAPR) problem at the transmitter side, which is an important drawback of Orthogonal Frequency Division Multiplexing (OFDM) systems. This new proposal is formulated as a Mixed Integer Non-Linear Programming (MINLP) optimization problem, which employs Generalized Benders Decomposition (GBD) and Branch-and-Bound (BB) methods to determine the most adequate extension factor and the optimum set of input symbols to be extended within a proper quarter-plane of the constellation. The optimum technique based on GBD, denoted as Generalized Benders Decomposition for Constellation Extension (GBDCE), provides a bound with relevant improvement in terms of PAPR reduction compared with other CE techniques, although it may exhibit slow convergence. To avoid excessive processing time in practical systems, the sub-optimum Branch-and-Bound for Constellation Extension (BBCE) scheme is proposed. Simulation results show that BBCE achieves a significant PAPR reduction, providing a good trade-off between complexity and performance. We also show that the BBCE scheme performs satisfactorily in terms of Power Spectral Density (PSD) and Bit Error Rate (BER) in the presence of a non-linear High Power Amplifier (HPA).

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“…Note that the AM/PM of SSPA is zero. 1 In this case, the Rapp's SSPA model introduces only AM/AM distortion, and the output signal of the SSPA can be expressed as:…”

Section: Simulation Resultsmentioning

confidence: 99%

PAPR Reduction via Constellation Extension in OFDM Systems Using Generalized Benders Decomposition and Branch-and-Bound Techniques

Paredes

Escudero-Garzás

García

2016

IEEE Trans. Veh. Technol.

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“…Figure 1 shows AM/AM characteristics of the above model at p of 2 and 6. The characteristic in the clipping region can be adjusted by the parameter p. The output power spectrum is concentrated by using this model with small p [6]. By varying this parameter p adaptively, in-band and out-ofband distortion power can be controlled.…”

Section: A Soft Clipping Methodsmentioning

confidence: 99%

An adaptive soft clipping method for spectrum sharing OFDMA systems

Fujiwara

Tomisato

Hata

et al. 2009

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications

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This paper proposes an adaptive soft clipping method for spectrum sharing OFDMA systems. The proposed method controls in-band and out-of-band distortion power by changing the nonlinearity parameter of soft clipping. The simulation results show that the proposed method can control the distortion power by 10 dB for a practical power amplifier. The results also show that a low-peak OFDMA transmitter can be realize with reasonable computational complexity because iterative processing for peak power reduction is unnecessary.

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“…Transmitter complexity is increased by adding Fast Fourier Transform (FFT), IFFT filtering and computationally expensive. This technique is simple compared with companding, and PTS, SLM [19,29]. Figure 4 shows MC CDMA with companding technique.…”

Section: Ccdf Of the Paprmentioning

confidence: 99%

Overview Of MC CDMA Papr Reduction Techniques

Sarala¹

2012

IJDPS

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High Peak to Average Power Ratio (PAPR) of the transmitted signal is a critical problem in multicarrier modulation systems (MCM) such as Orthogonal Frequency Division Multiplexing (OFDM), and Multi-Carrier Code DivisionMultiple Access (MC CDMA) systems, due to large number of subcarriers. High PAPR leads to reduced resolution, and battery life. It also deteriorates system performance. This paper focuses on review of different PAPR reduction techniques with attendant technical issues as well as criteria for selection of PAPR reduction technique. To reduce PAPR the constraints are low power consumption, and low Bit Error Rate (BER). Spectral bandwidth is improved by better spectral characteristics, and low complexity/cost.

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Power Backoff Reduction Techniques for Generalized Multicarrier Waveforms

Cited by 24 publications

References 11 publications

PAPR Reduction via Constellation Extension in OFDM Systems Using Generalized Benders Decomposition and Branch-and-Bound Techniques

PAPR Reduction via Constellation Extension in OFDM Systems Using Generalized Benders Decomposition and Branch-and-Bound Techniques

An adaptive soft clipping method for spectrum sharing OFDMA systems

Overview Of MC CDMA Papr Reduction Techniques

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