A multi-carrier amplifier for future mobile communications systems

The goal of dynamic channel allocation has eluded cellular system designers and operators alike since the concept of cellular mobile communications first became a reality. The idea of virtually instantaneous frequency re-planning of selected parts (or even all) of a cellular network has obvious attractions and alone would justify the considerable efforts being invested by a number of organisations towards this goal. The achievement of this flexibility would either require the use of remotely tunable combiners or of a broadband, highly linear power amplifier. The former option is unlikely ever to achieve the total flexibility promised by the use of a linear amplifier and hence this latter field has been the subject of considerable recent interest