National University of Sciences and Technology
Cognitive radios are increasingly being used for better utilization of licensed spectrum. Most of the work has been done on exploitation of time and frequency domain while code and space dimension have not been intensively explored for improving spectrum utilization. In this paper, the authors investigate exploitation of time and space domain simultaneously for optimizing licensed spectrum utilization while adopting cognitive terminals with genetic algorithm based smart antenna. Their work supports multiple simultaneous communications, i.e. more than one directed communication at a time while incorporating channel assignment algorithm for communication in all possible directions.