In this paper, we use the shooting and bouncing ray/image (SBR/Image) method to compute the
path loss for different outdoor environments in the commercial area of Taipei. Three types of antenna
arrays such as L shape, Y shape, and circular shape arrays are used in the base station and their
corresponding path loss on several routes in the outdoor environment are calculated. Moreover, the
genetic algorithm (GA) and particle swarm optimization algorithm (PSO) are employed to optimize
the excitation voltages and phases for these antenna arrays to reduce the path loss. The GA and PSO
optimization is applied to a high order nonlinear optimization problem. As such the chosen
optimization problem for a direct algebraic solution exists. By the obtained antenna patterns, we can
know the route with the lowest path loss; meanwhile, transmission power using this route in the base
station can be reduced. Numerical results show that the performance in reduction of path loss by PSO
algorithm is better than that by GA for these antenna arrays. The investigated results can help
communication engineers improve their planning and design of outdoor communication system.
關聯:
Journal of Applied Science and Engineering 15(4), pp.371-380
