A dual-mode radiotelephone terminal includes a .pi./4-shift DQPSK modulator (11). A dual-mode modulation is achieved by mixing an output of a transmitter oscillator (16) with an output of an offset oscillator (18) to form an injection signal (LO) at a final transmitter frequency, the injection signal...http://www.google.fr/patents/US5392460?utm_source=gb-gplus-shareBrevet US5392460 - Dual mode radiotelephone terminal selectively operable for frequency modulated or phase modulated operation
Dual mode radiotelephone terminal selectively operable for frequency ...
