Increasing spectral efficiency by managing adjacent channel interference

摘要

Due to the ever-increasing demands in wireless communications, spectrum seems to be a scarce resource today. Hence, new techniques that deal with the issue of spectrum management have to be developed. In this paper, possibilities to reduce the guard band between consecutive channels dynamically are investigated, thus improving spectral efficiency at the expense of an increasing amount of adjacent channel interference. In a first consideration, the strategy of shifting carrier frequencies is investigated. A second approach is the adaptive adjustment of roll-off factors when root raised cosine filters are used for pulse shaping as it is the case in 3G mobile communication systems. Moreover, an algorithm for dynamic guard band adaptation is developed. A simulation environment is set up and the simulation results are presented and discussed as well.