Analytical techniques are developed for predicting the performance of outdoor and in-building DS-CDMA mobile radio systems and fixed services sharing the same spectrum. The mobile radio and inter-system propagation characteristics are represented by a log-normally distributed distance dependent path-loss. For simplicity, the received signal variability attributable to multi-path fading is ignored. The mobile radio system performance is estimated using outage probability expressions, where an outage is defined to occur when the momentary BER exceeds a specified threshold rate. The in-building and outdoor mobile radio systems are assumed to use power control and the composite interference is assumed to be Gaussian distributed at the mobile radio receivers. Outage probability expressions which predict the performance of a fixed service sharing spectrum with a mobile radio system are developed. The fixed service is assumed to experience occasional multi-path fading attributable to unusual tropospheric conditions. The maximum tolerable mobile radio interference at a fixed service receiver depends on the performance requirements of the service. However a commonly used Standard which requires that the INR is less than -16dB has been adopted in this Thesis, and therefore an outage is defined to occur when the CNR ratio is less than the minimum required for reliable reception, or when the INR exceeds -16dB. Sufficient electromagnetic isolation between fixed and mobile systems sharing the same spectrum may be achieved using excision suppression techniques or by geographically separating the two systems. Excision suppression techniques will have a detrimental effect on the performance of a mobile radio system unless the fixed service signal is sufficiently narrow-band. The geographical separation distances required for spectrum sharing between fixed services, and outdoor and in-building DS-CDMA mobile radio systems are presented. The fixed services are assumed to be similar to those operating in New Zealand in the 1.7-2.3 GHz frequency bands. Mobile radio systems with 5, 10, 15 and 48 MHz channels are considered. It is shown that, for the systems considered, the geographical separation required between the two systems depends largely on the mobile radio and inter-system propagation characteristics, and the mobile radio and fixed service transmission powers. / Subscription resource available via Digital Dissertations only.
| Identifer | oai:union.ndltd.org:ADTP/274370 |
| Date | January 1998 |
| Creators | Marshall, Philip John |
| Publisher | ResearchSpace@Auckland |
| Source Sets | Australiasian Digital Theses Program |
| Language | English |
| Detected Language | English |
| Source | http://wwwlib.umi.com/dissertations/fullcit/9824384 |
| Rights | Subscription resource available via Digital Dissertations only. Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated., http://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm, Copyright: The author |
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