Transmitting and receiving radio signals

Details Transmitting and receiving radio signals Transmitting and receiving radio signals

1997-03-11

2000-07-18

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

375295, 375316, 332108, H04L 2700, H04L 2704, H03K 900, H03K 710

Patent

active

060917806

ABSTRACT:
In a satellite mobile telephone a radio signal is transmitted by firstly generating (602) a digital input signal. The digital input signal is processed (703) in combination with a digital modulating signal (704) to produce a digital intermediate signal. The digital intermediate signal is converted (705) into an analog intermediate signal and said analog intermediate signal is processed (706) in combination with an analog modulating signal to produce a radio frequency output signal. Similarly, during reception, a received signal is processed in combination with an analog demodulating signal to produce an analog intermediate signal. The analog intermediate signal is sampled to produce a digital intermediate signal and said digital intermediate signal is processed in combination with a digital demodulating signal so as to select a transmitted channel. By performing processors partially in the analog domain and partially in the digital domain, it is possible to achieve rapid phase lock with a relatively narrow channel spacing.

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patent: 5444415 (1995-08-01), Dent et al.
patent: 5631655 (1997-05-01), Posey et al.
patent: 5732333 (1998-03-01), Cox et al.
patent: 5841814 (1998-11-01), Cupo
patent: 5867535 (1999-02-01), Phillips et al.

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