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ETUDE DE L'IMPACT DU FILTRAGE ET DES NON-LINEARITES SUR LES SIGNAUX ULB DANS LES FRONT-END RADIO-FREQUENCE ET LES RESEAUX HYBRIDES OPTIQUE-RADIO

Abstract : Ultra Wide Band (UWB) systems are a new wireless technology capable of transmitting high data rate over a wide frequency spectrum for short distances (< 20 m) for wireless applications. The Power Spectrum Density (PSD) of the emitted signals must be as low as -41.3 dBm/MHz. In February 2002, the Federal Communication Commission (FCC) has allocated a band from 3.1 to 10.6 GHz for UWB communications. From that time, some differences appear depending on the country.
Among all the various transmission techniques using UWB labelled modulations, we study the Multi-Band-Orthogonal Frequency Division Multiplexing (MB-OFDM) modulation which has been proposed by the European Computing Machineries Association (ECMA) in 2005. However, the efficiency of Impulse Radio (IR) was pointed out. In this way, an original topology known as Multi-Band On-Off Keying (MB-OOK) is also presented.
In this thesis, we develop a System Simulation Tool (SST) to analyze the performances of UWB-OFDM system. The impact of the Radio-Frequency (RF) front-end and Low Noise Amplifier (LNA) non-linearity is studied on the Bit Error Rate (BER) of the overall receiver.
In the MB-OOK transmission chain, different filters are introduced. BER is studied in order to know which properties of the filters have the main impact on the MB-OOK transmission performances.
The optical domain can also be advantageously used to provide broadband optical UWB signal processing functions. Broadband Radio-over-Fiber (RoF) networks are raising great interest to provide both low cost optical intra-building distribution and signal processing of UWB signals. We investigate, from Error Vector Magnitude (EVM), optical transmission and frequency up-conversion of UWB-OFDM signals. In this proof of concept, a specific study is carried out to evaluate the capability to up-convert a MB-OFDM signal, and the impact of the Electronic/Optical (E/O) transceiver on the performance of the UWB-over-fiber system.
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https://tel.archives-ouvertes.fr/tel-00196269
Contributor : Philippe Lombard <>
Submitted on : Wednesday, December 12, 2007 - 1:59:10 PM
Last modification on : Friday, November 6, 2020 - 3:46:22 AM
Long-term archiving on: : Monday, April 12, 2010 - 7:09:07 AM

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  • HAL Id : tel-00196269, version 1

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Philippe Lombard. ETUDE DE L'IMPACT DU FILTRAGE ET DES NON-LINEARITES SUR LES SIGNAUX ULB DANS LES FRONT-END RADIO-FREQUENCE ET LES RESEAUX HYBRIDES OPTIQUE-RADIO. Micro et nanotechnologies/Microélectronique. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00196269⟩

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