Attard, Joseph Carmel; (2003) Fibre radio mm-wave systems: Architectural and interferometric noise considerations. Doctoral thesis (Ph.D.), University College London (United Kingdom).

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Abstract

The primary goal of this research work is to investigate the development of full duplex, multi-wavelength, fibre supported mm-wave overlay networks which inherently facilitate the reconfiguration of the wireless network. This network architecture focused approach outlined the need for the subsequent investigation on the impact of interferometric noise on such networks. Several network architectures which facilitate the dynamic reconfiguration of the wireless network have been proposed. This is achieved by the tight integration of the cellular radio, fibre radio, optical networking and physical layers. The large scale design of fibre supported mm-wave overlays necessitates an investigation into the impact of interferometric noise on these overlay networks. A detailed understanding of the behaviour of an optical distribution network in the presence of unequally powered interferers is carried out and the suitability of the symbol conditioned Modified Chernoff Bound for analysing such networks is established. Mathematical models of different mm-wave generation and modulation imposition techniques, in the presence of self homodyne beat noise, are developed and a comparative assessment of their performance is carried out. This thesis reports the derivation of a set of equations identifying the interference components generated by crosstalk between different multi-service channels, some of which are carrying fibre supported mm-wave signals. Frequency plan limitations for mm-wave WDM overlays, using suppressed optical carrier upconversion are identified following a theoretical and experimental investigation. New configurations for the simultaneous transport (within the same channel) of a baseband signal and a mm-wave signal, generated by optical suppressed carrier upconversion are proposed and their feasibility is determined. In conclusion the potential of such a fibre supported mm-wave network enabling optical access networks to offer a "quad play" of broadband services composed of voice, data, video and mobile is demonstrated. This would enable the costs of pervasive optical access networks deployment to be shared among more services and operators, while introducing a level of functionality that is difficult to achieve using other non integrated methods.

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