Predistortion performance considering peak to average power ratio reduction in OFDM context

Gouba, O. Abel; Louët, Yves

doi:10.1109/wcnc.2012.6214128

Cited by 9 publications

(11 citation statements)

References 11 publications

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“…Therefore, our first contribution consists in providing EVM expressions as a function of the transmitted power, the clipping threshold, and the PA and predistortion characteristics, as well as the PAPR of the input and clipped signals. As far as theoretical EVM derivations are concerned, some upper-bounds can be found in [26,27], and other contributions, as [28][29][30], give closed-form EVM expressions but modeling the RF front end as a simple clipping. To the best of our knowledge, despite numerous studies in the literature about PAPR, no analytical expression of the EVM, taking into account all the above mentioned parameters, exists in the literature.…”

Section: Introductionmentioning

confidence: 99%

EVM derivation of multicarrier signals to determine the operating point of the power amplifier considering clipping and predistortion

Cheaito

Hélard

Crussière

et al. 2016

J Wireless Com Network

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International audienceThe high peak-to-average power ratio (PAPR) remains a major drawback of multicarrier modulations. Hence, the nonlinear characteristics of power amplifiers (PA) results in strong distortion and low power efficiency when multicarrier modulations are used. In this paper, the impact of the nonlinearities on the amplified multicarrier signal is analyzed, considering both PAPR limitation using clipping and PA linearization. Therefore, we derive the expression of the error vector magnitude (EVM) of the amplified signal with and without the use of polynomial predistortion and/or clipping techniques. We provide analytical EVM expressions that depend on the PA and predistortion characteristics, as well as the PAPR and the average power of both input and clipped signals. These expressions are general formulas which allow to measure in-band distortion at the PA output. The simulation results show that the proposed expressions present perfect accuracy. Moreover, the trade-off between the PA linearity and efficiency is investigated considering the performance of the clipping and predistortion techniques. An analytical expression which gives the optimal input back-off (IBO) maximizing the PA efficiency with respect to any EVM constraint is provided. Finally, the predistortion complexity is discussed aiming at reducing it with respect to an EVM constraint

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Section: Introductionmentioning

confidence: 99%

EVM derivation of multicarrier signals to determine the operating point of the power amplifier considering clipping and predistortion

Cheaito

Hélard

Crussière

et al. 2016

J Wireless Com Network

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“…As shown above, the traditional predistortion can be expressed as an adding signal technique and we introduced its operating principle. The additional signal for the PA's non-linearity compensation is given by (19). As we can note, this algorithm is based on the assumption that the predistortion function is known.…”

Section: Error Compensation Algorithmmentioning

confidence: 99%

Adding signal for peak‐to‐average power reduction and predistortion in an orthogonal frequency division multiplexing context

Gouba

Louët

2013

IET signal process.

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International audienceIn this study, the authors look into digital predistortion and its combination with the peak-to-average power ratio (PAPR) reduction technique in the case of orthogonal frequency division multiplexing (OFDM)-based systems. First of all, the authors propose a new predistortion methodology which uses the addition of signals. Two different algorithms are investigated for the predistortion signals generation. The first one is based on the traditional predistortion method, where an estimation of the power amplifiers (PAs) characteristics is needed in the first place. The second algorithm to generate the predistortion signal does not need a priori PA estimation. It is based on an iterative compensation of the error between the amplified signal and the OFDM signal. Then, the authors combine this latter algorithm with the tone reservation PAPR reduction method in order to have a global adding signal expression. Two combination scenarios of PAPR reduction and predistortion obtained by means of adding a signal are proposed. The first one combines both of them in series while the second one is parallel. Performances of the proposed predistortion algorithms and the combination scenarios are compared thanks to simulations based on IEEE802.il a/g standards for a memoryless solid state PA

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“…The second axis is based on the evaluation of the signal distortions due to the HPA non-linearities that reflects the performance of the different PAPR reduction techniques. Accordingly, the authors in [15] provided an upper bound of the EVM for the PAPR clipping method. In [16]- [19] the authors independently calculated the EVM due to clipping without considering the HPA impact.…”

Section: Introductionmentioning

confidence: 99%

EVM Closed-Form Expression for OFDM Signals With Tone Reservation-Based PAPR Reduction

Hassan

Crussière

Hélard

et al. 2020

IEEE Trans. Wireless Commun.

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Peak to average power ratio (PAPR) reduction of OFDM signals has extensively been studied in the literature. Tone Reservation (TR) is one of the most famous algorithms and has already been included in some digital television standards such as DVB-T2 and ASTC3.0. However, the literature is still lacking theoretical analysis and performance bounds for the PAPR reduction of OFDM signals, especially using TR algorithms. For the first time, this paper provides fundamental results establishing the links between TR-PAPR reduction and the remaining signal distortions at the output of a non-linear high power amplifier (HPA) with and without memory effects. We first derive a generic EVM expression relying on the statistical characteristics of the samples composing the time domain signal and for any PAPR reduction technique. Computing these moments in the case of the quadratically constrained quadratic problem (QCQP) algorithm known as the optimal solution to the TR-PAPR reduction problem allows us to get the lower bound of the EVM of OFDM signals after TR-PAPR reduction and nonlinear HPA. As a reference, we also provide the EVM expression using a clipping-based PAPR reduction method. The obtained EVM expressions have direct practical meaning since they are in function of the input power back-off (IBO) applied to the signal before the HPA. They also consist in a general analytical framework for OFDM PAPR reduction since they can be further exploited to analyze the performance of sub-optimal TR-based PAPR reduction algorithms.

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Predistortion performance considering peak to average power ratio reduction in OFDM context

Cited by 9 publications

References 11 publications

EVM derivation of multicarrier signals to determine the operating point of the power amplifier considering clipping and predistortion

EVM derivation of multicarrier signals to determine the operating point of the power amplifier considering clipping and predistortion

Adding signal for peak‐to‐average power reduction and predistortion in an orthogonal frequency division multiplexing context

EVM Closed-Form Expression for OFDM Signals With Tone Reservation-Based PAPR Reduction

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