M-QAM-OFDM system performance in the presence of a nonlinear amplifier and phase noise

Costa, E.; Pupolin, S.

doi:10.1109/26.990908

Cited by 286 publications

(130 citation statements)

References 20 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%

“…It should be highlighted that third-degree December 23, 2011 DRAFT polynomials have been widely used to model nonlinear PAs [8], [15]- [17]. The ICIs considered in [3], [4], [7], [11]- [14] are not the same as in our manuscript and, as a consequence, the ICI variances and the cross-correlations between data symbols and ICIs are different as well.…”

Section: Introductioncontrasting

confidence: 39%

“…Theoretical analysis of OFDM systems with nonlinear memoryless PAs has been the subject of several studies in the literature [3], [4], [7], [11]- [14]. However, most of these works approximate the probability density function of the transmitted signal by a complex Gaussian function.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductioncontrasting

confidence: 39%

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

Fernandes

Mota

Favier

2012

IEEE Trans. Signal Process.

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“…In [33]- [35], the system model of OFDM transmission with I/Q imbalance and phase noise is introduced and dierent compensation schemes are proposed. In [36], a system performance analysis of the joint eects of nonlinear PA and phase noise is presented. In this thesis, based on individual concepts of RF impairments, a theoretical expression of the joint eects model is derived.…”

Section: Introductionmentioning

confidence: 99%

Ofdm Interference Analysis With Dirty Rf

Zheng¹

2011

Proceedings of the 1st International Conference on Pervasive and Embedded Computing and Communication Systems

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When passing through the RF analog electronics devices of the transceiver, the information signal is subject to various distortions named 'dirty RF' eects. Some distortions are inherent to analog radio devices, such as high power ampliers (HPA) at the transmitter and DAC/ADC. Others, such as phase noise and I/Q imbalance, result from various impairments in the transceiver RF front end devices. Regardless of the nature, each factor degrades the communication system performance.Owning to a number of advantages, such as the ability to provide a high data rate in a fading environment and relatively simple structure of the frequency domain equalizer, OFDM is considered as a strong candidate for future wireless broadband systems. OFDM performance, however, is very sensitive to the above RF impairments, such as nonlinear distortions from HPA, I/Q imbalance, phase noise etc.While inherently observed in any transceiver, in the most of part the dirty RF eects so far have been analyzed separately and techniques for their mitigation have been elaborated separately too. Meanwhile, when aecting jointly the above impairments may strengthen each other and moreover, techniques for mitigation of one factor may enhance the impact of another one. Kulkiessaan läpi lähetin-vastaanottimen analogisten RF-osien, informaatiosignaali altistuu lukuisille vääristymille, joita kutsutaan dirty RF -ilmiöiksi. Jotkin vääristymät ovat luontaisia analogisille radiolaitteille, kuten tehovahvistimille (HPA) lähettimessä ja DA/AD -muuntimille. Toiset, kuten vaihekohina ja I/Q-epätasapaino ovat puolestaan seurausta lähetin-vastaanottimen RF-etupään aiheuttamasta signaalin laadun heikkenemisestä. Riippumatta vääristymän aiheuttajasta, kukin edellä mainittu tekijä alentaa tietoliikennejärjestelmän suorituskykyä.Johtuen lukuisista eduistaan, kuten kyvystään tarjota korkeita datanopeuksia häipyvässä ympäristössä sekä verrattain yksinkertaisesta taajuusalueen ekvalisaattorin rakenteesta, OFDM:ää pidetään vahvana ehdokkaana tulevaisuuden langattomiin laajakaistajärjestelmiin. OFDM:n suorituskyky on kuitenkin erittäin herkkä yllä mainitulle RFosien aiheuttamalle signaalin laadun heikkenemiselle, kuten tehovahvistimen, I/Q-epätasapainon, vaihekohinan jne. aiheuttamille epälineaarisille vääristymille.Vaikka RF-ilmiöt ovatkin osa jokaista lähetin-vastaanotinta, dirty RF -ilmiöitä kuten myös menetelmiä niiden vähentämiseksi, on analysoitu yksittäin, muista irrallaan. Kuitenkin, vaikuttaessaan yhtäaikaa, em. ilmiöt voivat vahvistaa toistaan ja lisäksi yhden ilmiön heikentämiseen tähtäävän menetelmän käyttö voi vahvistaa toista ilmiötä.Tämän työn tavoitteena on luoda simulaatiomalli ja analysoida OFDM:ää, kun I/Q-epätasapaino-, tehovahvistin-ja vaihekohina-ilmiöt otetaan samanaikaisesti huomioon.

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“…Some analysis results about OFDM performance in presence of nonlinearity are given in [4][5][6]. References [4][5][6] show that in the case of a large number of subcarriers, the effect of nonlinear distortions can be taken into account just introducing an equivalent Gaussian "nonlinear noise" added to the received symbol.…”

Section: Introductionmentioning

confidence: 99%

A compensating method based on SOM for nonlinear distortion in 16 QAM-OFDM system

Wang

Lü

Sekiya

et al.

2004 IEEE International Conference on Multimedia and Expo (ICME) (IEEE Cat. No.04TH8763)

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M-QAM-OFDM system performance in the presence of a nonlinear amplifier and phase noise

Cited by 286 publications

References 20 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

Ofdm Interference Analysis With Dirty Rf

A compensating method based on SOM for nonlinear distortion in 16 QAM-OFDM system

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