Spread-spectrum phase and channel tracking

Details Spread-spectrum phase and channel tracking Spread-spectrum phase and channel tracking

2007-11-09

2011-11-22

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S213000

Reexamination Certificate

active

08064499

ABSTRACT:
Common components are used to detect messages from a variety of transmitters, and the characteristics of each detected message are used to dynamically configure the demodulation process for each message. Channelization is selectively performed before, after, or before-and-after de-spreading, depending upon the particular environment and/or the particular characteristics of the received messages. Frequency synchronization to each transmitter is achieved by initializing a tracking loop within the demodulator associated with the transmitter, and code-phase synchronization to each transmitter is achieved by selectively inserting or deleting bits, based on the frequency and code-phase characteristics of the detected message.

REFERENCES:
patent: 6088413 (2000-07-01), Autry et al.
patent: 6317019 (2001-11-01), Fleeter
patent: 6396819 (2002-05-01), Fleeter et al.
patent: 6985512 (2006-01-01), McDermott et al.
patent: 7110435 (2006-09-01), Sorrells et al.
patent: 7227884 (2007-06-01), McDermott
patent: 2002/0191632 (2002-12-01), McDermott
U.S. Appl. No. 11/681,759, filed Mar. 3, 2007, Stafford et al.

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