Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-01-04
2005-01-04
Burd, Kevin M (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
Reexamination Certificate
active
06839378
ABSTRACT:
Multipath delay estimation of a direct sequence spread spectrum (DS-SS) signal transmitted in a multipath fading channel is accomplished by measuring the envelope of the signal to determine a new delay estimate. Delay estimates are also obtained in ray strength order, by subtracting out the influence of the stronger rays on the weaker ones. This subtraction approach can be performed iteratively, allowing further refinement of the delay estimates. Delay estimates can also be determined by minimizing the mean square error (MSE) between a measured correlation function and a modeled correlation function. The minimum mean square error (MMSE) approach can performed iteratively, to further refine the delay estimates. Maximum likelihood (ML) delay estimates can also be obtained by exploiting side information regarding the transmit and receive pulse shapes.
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Standard Search Report dated Oct. 1, 1998.
Bottomley Greg
Chennakeshu Sandeep
Ramesh Rajaram
Sourour Essam
Burd Kevin M
Ericsson Inc.
Myers Bigel Sibley & Sajovec P.A.
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