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Title: Millimetre-wave over fibre systems for pico-cellular networks
Author: Nkansah, Anthony Godfried
ISNI:       0000 0004 2669 2017
Awarding Body: University of Kent
Current Institution: University of Kent
Date of Award: 2007
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An outdoor star-tree mm-wave radio over fibre architecture for pico-cellular broadband systems is presented, and compared with other proposed architectures. Its feasibility is verified by detailed performance analysis in a commercial photonics Physical layer simulator. This work also led to the development of Multimode Fibre (MMF) modelling to match measured multimode Vertical-cavity Surface-Emitting Laser (VCSEL) based MMF responses. The MMF models developed can be incorporated into mm-wave over MMF system modelling. Experimental measurements for the coherence bandwidth of 62.5/125μm and 50/125μm multimode fibre links using 850nm VCSEL transmitters have also been carried out for the first time. It is shown that characterisation using coherence bandwidth over any given signal band provides reliable indications of the performance of radio over fibre transmission of different wireless system signals without the need to test using modulated signals. The knowledge obtained from the MMF characterisation led to a proposal for a cost-effective VCSEL-based star/tree radio over fibre architecture for indoor millimeter-wave systems. The indoor pico-cells can be located many km from a Central Office, with the longer distance distribution performed using single-mode fibre and the in-building distribution using MMF. The feasibility of the system is verified through experimental demonstration. WiMAX modulation schemes (QPSK, 16 QAM and 64 QAM) at 6MSps and 20MSps is demonstrated for a link that emulates a cost effective 1.550nm VCSEL based radio over fibre millimetre-wave indoor pico-cellular system. The system consists of a concatenation of 20km single mode fibre and 300m MMF links between a central office and remote antenna unit and employs remote 30GHz Local Oscillator (LO) delivery. Successful transmission over both optical and wireless paths is achieved with good signal performance recorded for uplink and downlink. A maximum cell size of radius 7.8m was predicted by a link budget analysis for a 20MSps 64 QAM signal transportation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available