Pulse or digital communications – Receivers – Angle modulation
Patent
1996-02-01
1998-09-22
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375325, H03D 300, H03K 906
Patent
active
058126074
ABSTRACT:
A system and method for processing wideband data within digital FM transceiver. A digital FM demodulator within the transceiver produces a demodulated information signal in response to the FM signal. The digital FM receiver also includes a wideband message processing section for recovering message information from the demodulated information signal. A word register circuit within the wideband message processing section stores one or more repetitions of a message word recovered from the demodulated information signal. During operation of the FM receiver in a control channel mode, a dotting detector within the wideband processing section is used for detecting a first dotting sequence within the demodulated information signal. Similarly, the dotting detector serves to detect a second dotting sequence within the demodulated information signal during operation in a voice channel mode. A word sync sequence is also identified within the demodulated information signal prior to storage of the one or more repetitions of the received message word within the word register circuit. A reconstructed message word is then generated by comparing corresponding bits within the one or more repetitions of the one message word. A message prefilter determines whether a processor interrupt should be generated by ascertaining whether the reconstructed message word is of a predefined type. A digital FM transmitter of the transceiver is controlled on the basis of busy-idle channel status information recovered from the demodulated information signal.
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Ault Jan C.
Hutchinson, IV James A.
Chin Stephen
Ghayour Mohammad
Martin Roger W.
Miller Russell B.
Qualcomm Incorporated
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