Concept

Bruit de phase

Publications associées (134)

A GSM-GPRS/UMTS FDD-TDD/WLAN 802.11a-b-g multi-standard carrier generation system

A compact carrier generation system enabling proper interoperability among quad-band GSM, WCDMA (FDD and TDD), and WLAN (802.11a/b/g) standards is developed. The implementation is achieved in 0.25-mum BiCMOS-SiGe process. The measured tuning range is highe ...

2006

Multistandard carrier generation system for quad-band GSM/WCDMA (FDD-TDD)/WLAN (802.11 a-b-g) radio

Adil Koukab

A compact carrier generation system enabling proper interoperability among quad-band GSM, WCDMA (FDD and TDD) and WLAN (802.11a/b/g) standard is developed. The implementation is achieved in 0.25μm BiCMOS-SiGe process. The measured tuning range is higher th ...

2006

Joint Compensation of IQ Imbalance and Phase Noise in OFDM Systems

Ali H. Sayed

The joint effects of IQ imbalance and phase noise on OFDM systems are analyzed, and a compensation scheme is proposed to improve the system performance. The scheme consists of a joint channel estimation algorithm and a joint data symbol estimation algorith ...

IEEE2006

Phase noise in bipolar and CMOS VCO's - an analytical comparison

Adil Koukab

As RF IC design has become more prevalent and more demanding, the need for a more precise VCO phase noise model has arisen. For both MOS and bipolar VCO's new formulas are still being proposed to model the phase noise, which is a key factor for a precise o ...

2006

Phase estimation methods and their application to holographic interferometry

Rajesh Langoju

Phase of the interference fringe pattern is known to convey important information in optical metrology. Typically, phase measurement using temporal techniques involves incorporating a piezoelectric device (PZT) in one arm of the interferometer for shifting ...

EPFL2006

Unsupervised Spectral Subtraction for Noise-Robust ASR on Unknown Transmission Channels

Hervé Bourlard, Guillaume Lathoud

This paper addresses several issues of classical spectral subtraction methods with respect to the automatic speech recognition task in noisy environments. The main contributions of this paper are twofold. First, a channel normalization method is proposed t ...

IDIAP2006

Digital adaptive phase noise reduction in coherent optical links

Ali H. Sayed

Coherent optical links enable high-density constellations and, consequently, a higher throughput. However, the phase noise associated with the transmitter and the receiver lasers is a challenging issue in coherent lightwave systems. The authors present an ...

IEEE2006

Digital holographic microscopy, a new optical imaging technique to investigate cellular dynamics

Pierre Magistretti, Christian Depeursinge, Tristan Colomb, Etienne Cuche, Benjamin Rappaz, Pierre Marquet, Jonas Kühn, Florian Charrière

We have developed a digital holographic microscope (DHM), in a transmission mode, adapted to the quantitative study of cellular dynamics. Living cells are optically probed by measuring the phase shift they produce on the transmitted wave front. The high te ...

SPIE2006

Low-Power Adaptive Bias/Clock Generator Using 0.18um CMOS Technology for Multi-Core Continuous Voltage and Frequency Scaling

Yusuf Leblebici, Zeynep Toprak Deniz

This paper presents a continuous voltage and frequency scaling approach achieving lower transition (both energy and time) overheads implied by changing voltage levels, at a very low power dissipation and silicon area cost for multi-processor systems with i ...

2005

A Low-Power Adaptive Bias/Clock Generator for Fine-Grained Voltage and Frequency Scaling in Multi-Core Systems

Yusuf Leblebici, Zeynep Toprak Deniz

2005

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