Mohammad H. Radio interfaces and planning optimization of broadband mobile communication systems.

The thesis is devoted to the study and simulating of code sequences properties and modulation methods in radio interfaces of broadband mobile communication systems, their structural and parametric optimization and improvement of existing methods of planning, given the coverage and quality issues in radiocompatibility sharing of radio resources. In this work the strategies of planning and development of modern mobile communication systems are analyzed. Investigation of specificity and properties of orthogonal code sequences used into radio interfaces of broadband mobile communication system UMTS was carried out. An analytical model based on the formulas for selection of orthogonal code sequences by analysis of their autho-, mutual correlation and noise properties were proposed. A multicriterion optimization of structures and parameters of the broadband mobile communication systems was carried out, a graphical results obtained allow to draw conclusions about the possibility of radio interfaces and system structure improving through the use of new types of orthogonal code sequences and the method of structural and parametric mutual optimization of broadband radio communication networks with regard to types of channel code sequences sets, location, number of base stations and power transmitters. The application for the implementation of broadband CDMA systems radio interfaces a sets of combinations with selected code sequences such as Gold and Walsh with the best correlated and noise properties can increase the signal-noise ratio in radiochannel up to 7dBp mutually reduce transmitter power up to 2%, decrease the distance between transmitters, increase their number up to 8%, which allows to increase the density of coverage or speed for one subscriber. The method of spatial optimization of radio systems by their radio frequency compatibility with help of graphical-analytical simulating the spatial location and parameters of data transfer centers working in the same spectral range was developed.