Simple and robust digital code tracking loop for wireless communication systems
AssigneeInterDigital Technology Corporation
InventorBin Li
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Abstract
A simple and robust CTL is used for time tracking of multipath components of a spread spectrum signal transmitted over a wireless multipath fading channel. A digital code-tracking loop includes despreading early and late data samples by use of a pseudonoise sequence, an error signal output generated by the despreading, and adjustment for a plurality of on-time, early and late samples, a data rate of a control signal provided as a fractional proportion of a data rate of error signals.
Claims15
A digital code-tracking loop comprising:
- a despreader for despreading early and late data samples by use of a pseudonoise sequence;
- an error signal output generated by the despreader;
- and
- an adjustment for a plurality of on-time, early and late samples, a data rate of a control signal provided as a fractional proportion of a data rate of error signals.
A radio transmission controller implementing a digital code-tracking loop, the radio transmission controller comprising:
- a despreading circuit capable of despreading early and late data samples by use of a pseudonoise sequence;
- a circuit providing an error signal output generated by the despreading;
- a circuit providing a control signal;
- and
- a circuit providing adjustment for a plurality of on-time, early and late samples, a data rate of a control signal provided as a fractional proportion of a data rate of error signals.
Dependencies are inferred from the claim text.