Fundamental limits and possibilities for future telecommunications

Using fundamental physical and information theoretical relations, we have considered fundamental capacity limits and possibilities of fiber optical, cellular radio, and satellite communication systems. In a fiber to the home scenario more than 1 Gb/s equivalent circuit-switched capacity may well be feasible in the future. In a microwave cellular or satellite radio network for mobile subscribers it may well be feasible, although requiring low-cost very advanced electronics, to reach several tens of megabits per second.