الفهرس Only 14 pages are availabe for public view
 |  | from | 179 |  |  |
| | | from | 179 | | |
Abstract
The performance of frequency hopping code division multiple access
systems when used on a land mobile satellite system is analysed. The
analysis takes into consideration the combined effect of most of the
transmission impairments arising in this specific circumstance. The first
factor taken into consideration is the effect of land mobile satellite fading
channel. The land mobile satellite channel is characterized by a Rician fading
model when the line-of-sight is unobstructed and by a shadowed Rician
fading model when it is obstructed. Both models are analysed in this
dissertation. Other transmission impairments that are taken into consideration
are multiple access interference (MAI), AWGN and jamming.
The main part of this dissertation is the performance analysis of FHCDMA
system when used on a land mobile satellite communication system
under the effect of intentional interference (jamming). It is proven that FHCDMA
systems can resist intentional and non-intentional interference, of
different forms, to certain degree. But the system performance can be
drastically affected by the jamming. In case of PBNJ, the jammer power
needs to be very high relative the signaling power. In case of MTJ the
number of jamming tones needs to be more than 50% of the total hopping
bins, taking the effect of fading, MAI and AWGN into consideration