Power efficiency enhancement and parasitic radiation reduction methods for mobile radio systems

In a mobile system, most of the radiated power transmitted is wasted and is the source of interference for many victim receivers and a radiation hazard for people. Only a very small part of the transmitted energy and power reach the desired receiver. We suggest new techniques to enhance base station energy efficiency and reduce radiation hazards using smart antenna arrays. We also suggest methods for mobile headphones to enhance transmission efficiency and mitigation techniques to reduce users radio energy absorption. We hope that, in the future and for the third or fourth generation cellular systems, such techniques will become dominant. These techniques are more easily implemented for the new cellular frequency range of 1800/2000 MHz and even for higher frequencies, than for the actual dominant 900 MHz band. This is due to the smaller antenna dimensions and to less radiation hazards from the new higher frequency bands.