Systems and methods for integrating cellular and location detection functionality using a single crystal oscillator

摘要

Embodiments of the present disclosure use shared oscillator for cellular communications and location detection in a communication device. The communications device estimates a frequency offset of one of its subsystems. The communications device determines a frequency offset that results from drifting of this shared oscillator, typically caused by aging and/or changes in temperature, voltage, humidity, pressure, and/or vibration to provide some examples, from the frequency offset this subsystem. The communications device provides various compensation parameters to its various subsystems to compensate for the frequency offset that results from drifting of the oscillator.

主权项

1. An apparatus, comprising:
an oscillator configured to provide a reference signal that is characterized as having a reference frequency that is subject to a variation in frequency over time; a first subsystem coupled to the oscillator, wherein the first subsystem comprises a first phase locked loop, (PLL), and wherein the first subsystem is configured to process a first communication signal using the reference signal; a second subsystem coupled to the oscillator, wherein the second subsystem comprises a second PLL, and wherein the second subsystem is configured to process a second communication signal using the reference signal; and a frequency compensation module configured to:
estimate a first frequency offset present in the first communication signal,determine a second frequency offset based on the first frequency offset,provide a first compensation parameter that is derived from the second frequency offset to the first PLL, andprovide a second compensation parameter that is derived from the second frequency offset to the second PLL.