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Title: Fixed millimetric and microwave network planning in a cellular environment and the introduction of the 38GHz band into the Brisbane area
Author: Forknall, Neil Peter
Awarding Body: University of London
Current Institution: University College London (University of London)
Date of Award: 1999
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Cable and Wireless Optus is an operator in Australia which provides a GSM service. The availability of its transmission network is controlled by establishing a minimum standard between the mobile switching centre and any base station in the network. Maximum frequency reuse has been achieved by limiting the transmission power of the fixed radios to a level where the quality objectives of the hop are met but the interference is kept to a minimum. Optus use propagation models provided by the International Telecommunications Union to predict availability on fixed radio hops. In 1996 Optus made the decision to use the 38GHz band in the Brisbane area in 1998. However, the 38GHz band had not been used previously in this area, by Optus or any other operator, and no data was available on 38GHz propagation in the region. To evaluate the accuracy of the availability predictions, based on the data and models provided by the International Telecommunications Union, a 38GHz field trial was established. Over a 12 month period the received power level was recorded on a 2.1km vertically polarised path operating at 38GHz. The rainfall, wind speed and wind direction were also recorded. Based on a rainfall intensity estimate provided in ITU-R PN.837-1, and the rainfall attenuation model outlined in ITU-R R530-7, the link was predicted to experience fading of 25dB for approximately 52.6 minutes. However, fading of 37 dB was recorded for 53.48 minutes and fading of 25 dB was exceeded for 97.6 minutes during the measurement period. Although a one year observation period is not a long period of time, suggestions for planning 38GHz links in this area have been made which should help to ensure the availability figures demanded by Cable and Wireless Optus are satisfied.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available