Distortion of OFDM Signals on Radio-Over-Fiber Links Integrated With an RF Amplifier and Active/Passive Electroabsorption Modulators

Song, Ju Bin; Islam, Aynul

doi:10.1109/jlt.2007.915213

Cited by 17 publications

(5 citation statements)

References 11 publications

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“…The definition of ACPR depends on the system standard. Generally, it relates the ratio of the power in the adjacent channel (or out‐of‐band power) to the power in the channel under consideration (in‐band power) [16]. The ACPR is given by

ACPR = \frac{\int_{f_{3}}^{f_{4}} S_{x x} (f) normald f}{\int_{f_{1}}^{f_{2}} S_{x x} (f) normald f}

where f 1 and f 2 are the frequency limits of the channel under test, f 3 and f 4 are the frequency limits of the adjacent channel, and S xx ( f ) is the power spectral density (PSD) of the measured signal.…”

Section: Performance Metricsmentioning

confidence: 99%

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Experimental demonstration of digital predistortion for orthogonal frequency‐division multiplexing‐radio over fibre links near laser resonance

Vieira

Gomes

2015

IET Optoelectronics

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ACPR = \frac{\int_{f_{3}}^{f_{4}} S_{x x} (f) normald f}{\int_{f_{1}}^{f_{2}} S_{x x} (f) normald f}

Section: Performance Metricsmentioning

confidence: 99%

“…The definition of ACPR depends on the system standard. Generally, it relates the ratio of the power in the adjacent channel (or out-of-band power) to the power in the channel under consideration (in-band power) [16]. The ACPR is given by…”

Section: Performance Metricsmentioning

confidence: 99%

Experimental demonstration of digital predistortion for orthogonal frequency‐division multiplexing‐radio over fibre links near laser resonance

Vieira

Gomes

2015

IET Optoelectronics

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“…The method in [11] utilizes power series coefficients of the nonlinear devices, while [10] models the distortion and attempts to correct for it using dynamic and multidimensional lookup tables (LUTs) for digital predistortion. [12] utilizes a semi-analytic approach using a Gaussian nonlinear noise model, [13] models the nonlinear distortion using an amplified replica of the information signal plus a distortion signal uncorrelated to that of the information signal, and [14] models the distortion using a combined Volterra-series and impulse response-based analytic model. [15] models the nonlinearity induced distortion by means of a complex gain and a zero mean additive Gaussian term, [16] models the distortion as a rare event and focuses on evaluating system performance by using conditional probability of bit error, while [17] attempts to minimize the distortion using level-crossing theory for high clipping thresholds.…”

Section: Theoretical Scic Ofdm Performancementioning

confidence: 99%

“…After the output of the receiver FFT block, we can write the frequency domain signal as vi =aoYiH[ + D[ +TJL (14) where D[ is the nonlinear (NL) distortion noise component, and TJ~is the Gaussian noise having variance O"~.…”

Section: Theoretical Scic Ofdm Performancementioning

confidence: 99%

OFDM subcarrier interference cancellation for non-linear PA distortion

Kleider

Steenhoek

2009

MILCOM 2009 - 2009 IEEE Military Communications Conference

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P OFDM offers high bandwidth efficiency and low receiver equalization complexity; consequently OFDM is growing in popularity for adoption into robust high data rate services in wireless multipath channels. While these advantages have been proven for many wireless applications (including numerous IEEE wireless standards), one potential disadvantage ofOFDM is that it exhibits high peak-toaverage power ratios (PAPR). The high PAPR characteristic of OFDM can induce in-band and out-of-band distortions when the peaks of the OFDM waveform enter the compression region of the transmitter power amplifier (PA). Several techniques exist to reduce the PAPR and, in addition, signal pre-distortion can be applied prior to the PA to linearize the signal; however, significant distortion can still reach the receiver. We introduce a PA subcarrier interference cancellation (SCIC) method that improves upon previous receive-side non-linear interference cancellation (NLIC) techniques and show the resulting improvement using actual PA devices. Initially we derive theoretical performance analysis that enables us to predict the performance analytically and confirm the improvements via simulation of our SCIC technique. We demonstrate at least a 5 dB SNR improvement, at 0 dB input backoffofthe PA, using our OFDM design with SCIC. We conclude that robust channel estimation, using optimized pilot designfor OFDM with null edge subcarriers, and SCIC are jointly critical for improving OFDM's robustness when transmitted through nonlinear PA devices.

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“…Coupled with laser nonlinearities, analog modulation induces also distortions of the optical signal, which limits the maximum usable bandwidth of the fiber link [13], especially when the signal amplitude is large [14]. Because of this signal distortion, there is inevitably some modulation power at the harmonics of the modulation frequency and, consequently, degradation of the output signal quality [1].…”

Section: Introductionmentioning

confidence: 99%

Mode oscillation and harmonic distortions associated with sinusoidal modulation of semiconductor lasers

Ahmed

Yamada

2012

Eur. Phys. J. D

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Abstract. This paper investigates mode dynamics, operation characteristics and signal distortions associated with sinusoidal modulation of semiconductor lasers. The study is based on intensive integrations of the multimode rate equation model of semiconductor lasers over wide ranges of the modulation frequency and depth. The rate equations take into account both spectral symmetric and asymmetric suppressions of modal gain. The higher harmonic distortions as well as the half harmonic distortion associated with the period doubling effect are investigated. The study is applied to both cases of single-mode and multimode oscillations of the non-modulated laser. The obtained results showed that the modulated signal has six distinct waveforms depending on the modulation conditions; three types have continuous periodic waveforms and the others have periodic pulsing waveforms. The modulated laser is found to oscillate in a single mode under weak modulation where the modulated signal is continuous, whereas the pulsing signals are associated with multimode oscillation. The higher harmonic distortions of single-mode laser are lower than those of two-mode lasers, and become serious at modulation frequencies around the relaxation oscillation frequency. These distortions are highest when the laser output is pulsating and the pulses are superposed by relaxation oscillations.2

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Distortion of OFDM Signals on Radio-Over-Fiber Links Integrated With an RF Amplifier and Active/Passive Electroabsorption Modulators

Cited by 17 publications

References 11 publications

Experimental demonstration of digital predistortion for orthogonal frequency‐division multiplexing‐radio over fibre links near laser resonance

Experimental demonstration of digital predistortion for orthogonal frequency‐division multiplexing‐radio over fibre links near laser resonance

OFDM subcarrier interference cancellation for non-linear PA distortion

Mode oscillation and harmonic distortions associated with sinusoidal modulation of semiconductor lasers

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