Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-04-12
2005-04-12
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S142000, C375S150000, C375S261000, C375S327000, C375S371000, C370S342000, C370S441000, C370S479000, C370S516000
Reexamination Certificate
active
06879623
ABSTRACT:
A receiving communication device synchronizes to a timing reference of a transmitting communication device based on a determined timing error. The receiving communication device determines the timing error by processing a synchronization signal via a first stage filtering and interpolation process that includes predetermined coefficients and a second stage interpolation process that includes a minimal number of dynamically determined coefficients. By dividing the process into a predetermined coefficient stage and a dynamically determined coefficient stage, the receiving communication device is able to make timing adjustments in a more efficient manner, that is, at a lesser processor loading, than a communication device in which all filtering and interpolation coefficients are dynamically determined. In addition, by including a second order timing recovery loop, the receiving communication device is able to quickly and precisely respond to drifting of a timing reference differential between itself and the transmitting communication device.
REFERENCES:
patent: 4989221 (1991-01-01), Qureshi et al.
patent: 5309482 (1994-05-01), Wright et al.
patent: 5724396 (1998-03-01), Claydon et al.
patent: 6055284 (2000-04-01), Kweon
patent: 6744835 (2004-06-01), Panicker et al.
R.A. Iltis and S.H. Goldberg; “A DS Spread Spectrum RAKE Receiver with Narrowband Interference Rejection Capability: Operation in Fading Channels”; IEEE, pp. 0704-0708, 1989.
Agami Gregory
Corke Robert John
Prysby Daniel G.
Rotstein Ron
Ha Dac V.
May Steven A.
Motorola Inc.
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