Direct Transmission of Ultra Wide Band Signals Using Single Mode Radio-over-Fiber System

Tan, Chinh; Ong, Lawrence; Yee, M.L.; Luo, Bin; Tang, Pak Kay

doi:10.1109/apmc.2005.1606524

Cited by 17 publications

(15 citation statements)

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“…In a cellular CDMA system, capacity is calculated at an operating o b N E / [20] as given by Eq. 24 (24) where p G is the processing gain (i.e. the ratio of the chip rate to the data rate), 0 η is the cell load factor , α is the activity factor of the data signal, and ρ is the intercell to intracell interference ratio.…”

Section: Simulation Setupmentioning

confidence: 99%

Pilot‐aided estimation and equalisation of a Radio‐over‐Fibre system in Wideband Code Division Multiple Access

Baghersalimi¹,

O’Farrell²

2013

IET Communications

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AbstractÑIn this paper the impact of a Radio over Fibre (RoF) subsystem on the capacity performance of Wideband Code Division Multiple Access (WCDMA) is evaluated. The study investigates the use of pilot aided channel estimation to compensate for the optical subsystem nonlinearities for different channel conditions, estimation intervals, and coding schemes. The results show that pilot aided channel estimation is an effective method for compensating the composite impairments of the optical subsystem and the RF channel. It is found that there is always a suitable pilot power level which maximises the system capacity performance regardless of coding scheme and channel condition. Also, the peak capacity is only slightly affected by a decrease in the estimation interval.

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Section: Simulation Setupmentioning

confidence: 99%

Pilot‐aided estimation and equalisation of a Radio‐over‐Fibre system in Wideband Code Division Multiple Access

Baghersalimi¹,

O’Farrell²

2013

IET Communications

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“…UWB systems operate in the frequency range from 3.1 to 10.6GHz according to the U.S. Federal Communication Commission (FCC) [1] and are limited to distances of a few meters, with a negligible integration with the existing wired or wireless local area network. As a consequence, UWB-over-fiber technology may provide an effective solution to offer service availability across different networks and to achieve high-rate data access at any time and from any place [2]. Whereas recent papers have dealt with impulse based UWB [2], here we focus on the MB-OFDM over fiber technique [3] using laser direct modulation.…”

mentioning

confidence: 99%

“…As a consequence, UWB-over-fiber technology may provide an effective solution to offer service availability across different networks and to achieve high-rate data access at any time and from any place [2]. Whereas recent papers have dealt with impulse based UWB [2], here we focus on the MB-OFDM over fiber technique [3] using laser direct modulation. We analyze the different parameters that come into play in order to reach the system optimum operating point keeping in mind the need for simplicity and economical solutions required by home networks.…”

mentioning

confidence: 99%

Analysis of Laser Induced Distortions in Ultra Wide Band MB-OFDM over Fiber

Pizzinat

Charbonnier

Moignard

2006

LEOS 2006 - 19th Annual Meeting of the IEEE Lasers and Electro-Optics Society

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Performances of a UWB OFDM system over fiber based on laser direct modulation are found to be mainly limited by nonlinearities in the laser response. The OFDM signal quasi Gaussian level distribution leads to a redefinition of the optical modulation index.There is an increasing interest in ultra wideband (UWB) systems for indoor networks. UWB systems operate in the frequency range from 3.1 to 10.6GHz according to the U.S. Federal Communication Commission (FCC) [1] and are limited to distances of a few meters, with a negligible integration with the existing wired or wireless local area network. As a consequence, UWB-over-fiber technology may provide an effective solution to offer service availability across different networks and to achieve high-rate data access at any time and from any place [2]. Whereas recent papers have dealt with impulse based UWB [2], here we focus on the MB-OFDM over fiber technique [3] using laser direct modulation. We analyze the different parameters that come into play in order to reach the system optimum operating point keeping in mind the need for simplicity and economical solutions required by home networks. OFDM transmission over fiber may be critical because OFDM signals are characterized by a very large peak to average power ratio causing high sensitivity to nonlinearities in the electro-optic (e/o) conversion [4]. These distortions may be evaluated by the optical modulation index (OMI) of the signal [5], but this measure is somewhat approximate as will be demonstrated in this paper. Our goal is to define an easily measurable parameter capable of quantifying the distortions induced in the e/o conversion stage by taking into account the signal level distribution in order to exploit the advantages of OFDM modulation (e.g. high spectral efficiency and robustness to dispersion). The MB-OFDM parameters are described in the Standard ECMA-368 [3]. The maximum effective isotropic radiated power allowed by the FCC is equal to -41.3dBm/MHz corresponding to a power of -14dBm for a single OFDM bandwidth of 528MHz. Additionally, considering a directly modulated DFB laser with η Tx =0.102W/A, a single mode fiber of 1km, and a PIN photodiode with η Rx =0.8A/W, the corresponding gain of the optical link is found to be:out dB opt Rx Tx optRF 2 . 22 50 50 log 10 2 . 0 2 8 . 0 102 . 0 log 20 log 10 2 log 20 ,Given the low UWB power level and the amount of optical link loss, it is reasonable to realize the UWB transmission over fiber by means of the scheme represented in figure 1, i.e. by inserting a low noise RF amplifier before the laser. Thus, the parameters that come into play are the RF power corresponding to the modulation current, P RFin , the laser point of polarization, I bias , and the number of transmitted OFDM bands. We perform numerical simulations to explore the dependence of the error vector magnitude (EVM) [6] on these parameters. For each OFDM band, we generate a pseudo random bit sequence at 640Mb/s, we apply a QPSK modulation and obtain the OFDM signal according to [3] with Matlab™....

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“…En [Tan05] y [Ong06], se presentan resultados sobre la transmisión óptica de señales UWB en sistemas RoSSMF. En estos trabajos, se propone la transmisión de un sistema IR-UWB basado en un monociclo Gaussiano en la banda de 3 GHz a 6 GHz con longitudes de hasta 500 m de fibra SSMF.…”

Section: Distribución Uwb Mediante Sistemas Rossmfunclassified

“…Los resultados de las referencias [Tan05], [Ong06], [Kas08] y [Llo08b], muestran la viabilidad de la utilización de las redes basadas en sistemas RoSSMF para el transporte y la distribución de señales UWB, en este caso IR-UWB. Los dispositivos clave en los sistemas RoF ya han sido descritos con anterioridad, aunque cabe destacar la revisión de los mismos propuesta en [Jaz08].…”

Section: Distribución Uwb Mediante Sistemas Rossmfunclassified

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

Soler¹

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IVPersonal Area Network). L'objectiu d'aquest estudi és obtenir màrges de seguretat per a garantir la interoperatibilitat d'ambdues tecnologies ràdio, els quals es poden aplicar en el futur desenvolupament de tècniques avançades de mitigació de la interferència com detecció i exclusió (DAA, Detect-and-Avoid), dins de futures aplicacions com les anomenades cognitive radio.Després, s'estudia la coexistència de MB-OFDM UWB i WiMAX IEEE 802.16e en xarxes òptiques d'accés basades en sistemes RoF. S'avaluen dos escenaris experimentals: en el primer, s'avalua un sistema RoF amb fibra multimode, i el segon, un sistema RoF amb fibra monomode. Els resultats permeten obtenir màrges de seguretat i abast màxim per al desplegament de sistemes RoF segons els tipus de fibra. Al mateix temps, es demostra i avalua experimentalment una nova tècnica de multiplexació per divisió en polarització de la transmissió òptica, per a millorar la coexistència en sistemes RoF.Finalment, aquesta Tesi Doctoral presenta l'estudi del modulador electro-òptic Mach-Zehnder, com a peça clau que limita el marge dinàmic de les transmissions als sistemes RoF. Al mateix temps, es proposa i avalua experimentalment una tècnica òptica de linealització del modulador Mach-Zehnder que millora el marge dinàmic del sistema RoF. V AbstractCurrent network and telecommunication systems are required to provide higher data rates in access networks to an increasing number of users. This fact is mainly due to the increase in the Internet traffic data, which is related with the higher demand of online videogames and software, the increased complexity in the content of web pages, the joint distribution of audio-visual and added-value online content, and the introduction of high-definition services and contents such as video on demand, as a result of a society increasingly more interconnected. In order to satisfy these higher data rates requirements, new techniques for the joint distribution of several wireless communication systems are proposed in this Thesis. The aim of these techniques is to facilitate the deployment of an integrated access network at the customer premises, enabling the integration of optical transmission over an optical access network and radio-frequency transmission in the same infrastructure.Two main wireless communication systems are considered in this Thesis, WiMAX (Worldwide Interoperability for Microwave Access) and UWB (Ultra-Wide Band) according to WiMedia Alliance recommendation. Comparing the bit rate and expected range, WiMAX and UWB are complementary radio technologies expected to coexist in a near future in integrated access networks. The optical access network considered in this Thesis can be regarded as a FTTH network (Fibre-to-the-Home). The wireless signals are natively transmitted over optical network, that is, without frequency upconversion and remodulation stages, over one or several optical carriers. This technology, which is known as Radio-over-Fibre (RoF), is well suited for integrated access networks.First, the requirements for...

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Direct Transmission of Ultra Wide Band Signals Using Single Mode Radio-over-Fiber System

Cited by 17 publications

References 0 publications

Pilot‐aided estimation and equalisation of a Radio‐over‐Fibre system in Wideband Code Division Multiple Access

Pilot‐aided estimation and equalisation of a Radio‐over‐Fibre system in Wideband Code Division Multiple Access

Analysis of Laser Induced Distortions in Ultra Wide Band MB-OFDM over Fiber

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

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