device for avoiding spektrumbreddning at to and franslag of a sendare

摘要

An apparatus for avoiding spectrum spreading in switching on and off a transmitter in a station included in a time multiplexed radio transmission system, e.g. a mobile telephony system, where two mutually 90-degree phase-shifted baseband signals (sin a(t), cos a(t)) are generated, each of these signals being intended to modulate a carrier wave. The apparatus includes means (MP, DAP, DAI, DAQ) achieving that the power of the baseband signals follows an increasing reference level at the start of each time slot and follows a decreasing reference level at the end of each time slot.