Method and apparatus for coherent demodulation in communication system employing a potentially gated pilot signal
AssigneeQUALCOMM Incorporated
InventorsTao Chen, Yu-Chuan Lin
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Abstract
The present invention is a novel and improved method and system for performing the pilot frequency tracking operation for coherent demodulation in a system employing a gated pilot signal. In particular, the present invention describes a method and apparatus in which two frequency tracking loops operate in parallel. The first frequency tracking loop performs its tracking operation based on the hypothesis that the received pilot is continuous throughout the frame's duration. The second frequency tracking loop performs the tracking operation based on the hypothesis that the received pilot is discontinuous and is only present for a portion of the frame's duration.
Claims20
An apparatus comprising:
- a processor to determine a data rate of a received frame based on an estimate of the received frame and an accuracy check of the received frame;
- and
- a frequency tracking module coupled to the processor to track frequency of received data in the received frame, the frequency tracking module comprising a first frequency tracking loop and a second frequency tracking loop,
- wherein the processor utilizes information provided by the first frequency tracking loop to track a center frequency of the received data if the determined data rate is not at a gated data rate, and wherein the processor utilizes information provided by the second frequency tracking loop to track the center frequency of the received data if the determined data rate is at the gated data rate.
A method comprising:
- determining a data rate of a received frame based on an estimate of the received frame and an accuracy check of the received frame;
- determining whether the data rate of the received frame is at a gated data rate;
- and
- tracking a center frequency of received data depending on whether the data rate of the received frame is at the gated data rate, based on estimates of the center frequency generated by a frequency tracking module comprising a first frequency tracking loop and a second frequency tracking loop.
Dependencies are inferred from the claim text.