Effects of HPA nonlinearity on frequency multiplexed OFDM signals

Banelli, Paolo; Baruffa, Giuseppe; Cacopardi, S.

doi:10.1109/11.948265

Cited by 71 publications

(48 citation statements)

References 10 publications

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“…This expression, contrary to the ones presented in previous works [3], [4], [11], [13], [14], corresponds to an exact description of the nonlinear ICI. After deriving a closed-form expression for the nonlinear ICI in terms of the frequency-domain data symbols, we obtain new expressions for the variance of the third-order ICI and for the correlation between one data symbol and the third-order ICI corresponding to the same subcarrier.…”

Section: Nonlinear Ici Analysiscontrasting

confidence: 50%

Analysis and Power Diversity-Based Cancellation of Nonlinear Distortions in OFDM Systems

Fernandes

Mota

Favier

2012

IEEE Trans. Signal Process.

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One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) systems is the high peak-to-average power ratio (PAPR) of the transmitted signals, which can cause the introduction of inter-carrier interference (ICI) due to the presence of nonlinear power amplifiers (PAs). In this paper, a theoretical analysis of the ICI in nonlinear OFDM systems with polynomial PAs is made. Contrary to other works, this analysis provides an exact description of the nonlinear ICI. Moreover, three receivers for channel estimation and ICI cancellation in OFDM systems with polynomial PAs are proposed, based on the concept of power diversity that consists in re-transmitting the information symbols several times with a different transmission power each time. The transmission powers that minimize the sum of the residual mean square errors (MSEs) provided by the proposed receivers are derived in the case of a thirddegree polynomial PA. An important advantage of the proposed receivers is that the optimal transmission powers do not depend on the channel nor the PA coefficients. Index TermsOFDM, power amplifier, nonlinear system, channel estimation, inter-carrier interference cancellation. C. A. R. Fernandes is with the

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Section: Nonlinear Ici Analysiscontrasting

confidence: 50%

Analysis and Power Diversity-Based Cancellation of Nonlinear Distortions in OFDM Systems

Fernandes

Mota

Favier

2012

IEEE Trans. Signal Process.

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“…We begin by noticing that subsets and are in-phase with the carrier at and will, therefore, add with it in amplitude. According to the sign of the third-order nonlinearity coefficient , those two subsets will provide either gain enhancement or gain compression to the wanted signal, evaluated as (8) It follows that the gain enhancement/compression expressed in (8) depends on , , , , and . It increases with decreasing and increasing .…”

Section: B Derivation Of the Snr At The Output Of The Nonlinearitymentioning

confidence: 99%

“…In [5], Shimbo examined the effects of intermodulation in multicarrier systems. More recently, many authors, [6]- [8] amongst them, have dealt with the impact in OFDM of traveling-wave tube (TWT) [9] or other high power amplifiers (HPAs) that exhibit AM/AM and AM/PM characteristics. The noise due to the nonlinearity was shown in these analyses to be approximately uncorrelated with the OFDM signal that is modeled as a Gaussian random process.…”

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confidence: 99%

On the effects of memoryless nonlinearities on M-QAM and DQPSK OFDM signals

Chorti

Brookes

2006

IEEE Trans. Microwave Theory Techn.

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Abstract-In the design of RF up-conversion and down-conversion communication links, an issue of special interest is presented by the nonlinear characteristic of analog devices. In this paper, we deal with the effect of memoryless nonlinear distortion on orthogonal frequency-division multiplexing (OFDM) transceivers. We tackle the issue of calculation of the number of intermodulation products with methods from combinatorics theory and derive closed-form expressions for the signal-to-noise ratio (SNR). We deal with third-order nonlinearities alone though the methodology used can be extended to cover higher order nonlinear phenomena. We then proceed to deriving SNR expressions in the presence of a high adjacent channel of the same service and predict the generation of in-band tonal interference. Finally, we generalize to the case of a multichannel OFDM transceiver. In each case, bit-error-rate estimations for differential quadrature phase-shift keying and symbol-error-rate estimations for -quadrature amplitude-modulation constellations are presented and a mapping between circuit characteristics and OFDM performance is outlined.Index Terms-Adjacent channel, bit error rate (BER), combinatorics, digital audio broadcasting (DAB), digital video broadcasting (DVB), discrete multitone (DMT), intermodulation, multicarrier system, nonlinearity, orthogonal frequency-division multiplexing (OFDM), RF circuits, signal-to-noise ratio (SNR), symbol error rate (SER).

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“…However, the peak-to-average power ratio (PAPR) of traditional OFDM signals can be bigger than 7 dB, which is a rough index for the high power amplifier (HPA). In radio frequency front end, the efficiency of HPA is degenerated with increasing PAPR of input signals [11][12][13]. The high PAPR value of OFDM signals will lead to the serious nonlinear distortion of HPAs [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Constant envelope OFDM RadCom fusion system

Huang

et al. 2018

J Wireless Com Network

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A joint radar and wireless communication (RadCom) fusion system is an important trend for future intelligent transportation, such as the Internet of Vehicles (IOV). However, traditional joint orthogonal frequency division multiplexing (OFDM)-based RadCom fusion system suffers from the problem of high peak-to-average power ratio (PAPR) of transmission signals, leading to nonlinear distortion in high power amplifiers (HPAs). To solve this problem, a new constant envelope OFDM RadCom approach is proposed in this paper. Taking phase modulation into consideration, the constant envelope OFDM RadCom system obtains 0 dB PAPR value, which results in linear high power amplifier being feasible. In the receiver side, both communication transmission and target detection are guaranteed by a phase demodulator and frequency-domain signal processing algorithm, respectively. Simulation results demonstrate that the constant envelope OFDM RadCom system is a feasible solution for future IOV with the capability of target detection and wireless communication simultaneously.

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Effects of HPA nonlinearity on frequency multiplexed OFDM signals

Cited by 71 publications

References 10 publications

Analysis and Power Diversity-Based Cancellation of Nonlinear Distortions in OFDM Systems

Analysis and Power Diversity-Based Cancellation of Nonlinear Distortions in OFDM Systems

On the effects of memoryless nonlinearities on M-QAM and DQPSK OFDM signals

Constant envelope OFDM RadCom fusion system

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