Sequential tracking and offline demodulation in receiver
AssigneeQUALCOMM Incorporated
InventorsDominic Gerard Farmer, Emilija M. Simic, Jie Wu
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Abstract
An apparatus and method for tracking a desired signal by sequentially tracking the desired signal with a variable integration time, performing automatic frequency control of the desired signal, and demodulating the desired signal using offline software. In one aspect, the automatic frequency control is performed using the offline software. In one aspect, the desired signal is from a GPS satellite.
Claims32
A receiver for tracking and data demodulation comprising:
- a baseband mixer having an output for providing I/Q data;
- a sequential tracking unit to sequentially track a desired signal with a variable integration time, the sequential tracking unit comprising
- an integrator having an input coupled to the output of the baseband mixer to receive the I/Q data, the integrator using a variable integration time;
- a peak processor coupled to the integrator;
- and
- a controller coupled to the peak processor to provide an adjustment signal;
- and
- an automatic frequency control (AFC) loop to perform automatic frequency control of the desired signal, the AFC loop comprising
- a data input coupled to the output of the baseband mixer to receive the I/Q data;
- a control input coupled to the controller to receive the adjustment signal;
- and
- a data demodulation unit to demodulate the desired signal.
A receiver for tracking and data demodulation comprising:
- means for mixing a signal to provide I/Q data;
- means for sequentially tracking a desired signal with a variable integration time, the act of sequentially tracking comprising
- means for integrating the I/Q data to form integrated data;
- means for detecting a peak of the integrated data;
- and
- means for controlling an adjustment signal;
- means for performing automatic frequency control of the desired signal based on the adjustment signal;
- and
- means for demodulating the desired signal.
A method by a receiver for tracking a desired signal comprising:
- mixing a signal to provide I/Q data;
- sequentially tracking the desired signal with a variable integration time, the act of sequentially tracking comprising
- integrating the I/Q data to form integrated data;
- detecting a peak of the integrated data;
- and
- controlling an adjustment signal;
- performing automatic frequency control of the desired signal based on the adjustment signal;
- and
- demodulating the desired signal.
A non-transitory computer-readable medium including program code stored thereon, comprising:
- program code to sequentially tracking a desired signal with a variable integration time, the act of sequentially tracking comprising
- program code to integrate I/Q data to form integrated data;
- program code to detect a peak of the integrated data;
- and
- program code to control an adjustment signal;
- program code to perform automatic frequency control of the desired signal based on the adjustment signal;
- and
- program code to demodulate the desired signal.
Dependencies are inferred from the claim text.