Radio remote interface for modulating/demodulating data in a dig

Details Radio remote interface for modulating/demodulating data in a dig Radio remote interface for modulating/demodulating data in a dig

1997-05-22

1999-10-19

Pham, Chi H.

Pulse or digital communications

Transceivers

370535, 370455, 455434, H04B 138, H04J 304, H04L 12403, H04Q 720

Patent

active

059700866

ABSTRACT:
In a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal, and a third type voice signal, a remote communication interface for providing transmission therebetweeen comprising a duplexer bridge network for transceiving the signal, low pass filters, and analog to digital and digital to analog converters for processing received and transmitted signals respectively, and a digital signal processor for modulating and demodulating the signal for transmission or reception according to the signal type. A control signal output from the digital signal processor enables adjustment of the clock sampling frequency during the reception and demodulation process to obtain bit sync, bit tracking and frequency tracking. The communication interface is operable to transceive either the modulated traffic, control, or voice signal, or combined modulated traffic and control signal, or combined modulated voice and control signal.

REFERENCES:
patent: 5199031 (1993-03-01), Dahlin
patent: 5357513 (1994-10-01), Kay et al.
patent: 5768308 (1998-06-01), Pon et al.
patent: 5781540 (1998-07-01), Malcolm et al.

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