Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
1999-04-05
2000-11-14
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
370335, H03D 100
Patent
active
061480428
ABSTRACT:
A method and apparatus for variable rate communication incorporating coherent signal processing and combining is described. Within the receive system, vectors of in-phase and quadrature-phase Walsh correlator output values are generated for each Rake finger over each Walsh symbol period. In-phase and quadrature-phase reference values are generated for each of the Rake fingers by combining the in-phase and quadrature-phase correlator outputs of the most likely Walsh symbols over a series of Walsh symbol periods. The output energies are calculated as the sum of squared in-phase and quadrature-phase values. The vectors of in-phase and quadrature-phases values are then projected on the in-phase and quadrature-phase reference values and weighted by the reference amplitude. The reference amplitude is the square root of the sum of squared in-phase and quadrature-phase values. The vectors of projected and weighted values are summed via coherently combining, and the corresponding values from the other Rake fingers used to obtain a resultant vector of coherently demodulated Walsh correlator outputs.
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Odenwalder Joseph P.
Willenegger Serge
Zehavi Ephraim
Baker Kent D.
English Sean
Ghebretinsae Temesghen
Qualcomm Incorporated
Wadsworth Philip R.
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