Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-05-30
2006-05-30
Vo, Don N. (Department: 2631)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S346000
Reexamination Certificate
active
07054394
ABSTRACT:
For a noise resistant estimation of a Doppler spread for a radio signal transmission channel in a mobile communications environment, the Doppler spread is estimated on the basis of an autocorrelation function for predefined signal portions of a received radio signal, such as pilot bits of signals transmitted via a control channel in a mobile telephone system. The received radio signal and in particular the predefined signal portions are demodulated to obtain discrete autocorrelation coefficients for the predefined signal portions. First and second derivatives of the autocorrelation function are estimated on the basis of at least two of the autocorrelation coefficients. In dependence of used autocorrelation coefficients, influence of noise included in the received radio signal can be at least reduced with respect to an estimation of the Doppler spread. Using the autocorrelation coefficients being indicative of the autocorrelation function and of the estimated first and second derivatives thereof, the Doppler spread can be estimated.
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Burleigh Roger
Telefonaktiebolaget LM Ericsson (publ)
Vo Don N.
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