Method and device for group delay variation compensation
Assigneeu-blox AG
InventorClemens Buergi
Life of this patent
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Abstract
A method for compensating group delay variations in a CDMA spread spectrum receiver, comprising: receiving an RF signal; generating an ideal replica signal; filtering the RF signal by one or more filters; obtaining an ideal auto-correlation function (ACF) of the ideal replica signal; distorting the ideal ACF to generate a distorted ACF by a filtering model of the one or more filters; aligning the ideal ACF and the distorted ACF; calculating a set of correction factors based on a ratio of the ideal ACF and the distorted ACF; calculating a cross-correlation signal based on the filtered RF signal and the ideal replica signal; and obtaining a compensated correlation signal by applying the set of correction factors to the cross-correlation signal.
Claims20
A method for compensating group delay variations in a CDMA spread spectrum receiver, comprising:
- receiving an RF signal;
- generating an ideal replica signal;
- filtering the RF signal by one or more filters;
- obtaining an ideal auto-correlation function (ACF) of the ideal replica signal;
- distorting the ideal ACF to generate a distorted ACF by a filtering model of the one or more filters;
- aligning the ideal ACF and the distorted ACF;
- calculating a set of correction factors based on a ratio of the ideal ACF and the distorted ACF;
- calculating a cross-correlation signal based on the filtered RF signal and the ideal replica signal;
- and
- obtaining a compensated correlation signal by applying the set of correction factors to the cross-correlation signal.
A CDMA spread spectrum device for compensating group delay variations, comprising:
- a receiver configured to receive an RF signal;
- one or more filters configured to filter the RF signal;
- and
- at least one processor configured to:
- generate an ideal replica signal;
- obtain an ideal auto-correlation function (ACF) of the ideal replica signal;
- distort the ideal ACF to generate a distorted ACF by a filtering model of the one or more filters;
- align the ideal ACF and the distorted ACF;
- calculate a set of correction factors based on a ratio of the ideal ACF and the distorted ACF;
- calculate a cross-correlation signal based on the filtered RF signal and the ideal replica signal;
- and
- obtain a compensated correlation signal by applying the set of correction factors to the cross-correlation signal.
Dependencies are inferred from the claim text.