Method and system for characterizing a radio channel of a wireless network using variability of synchronization
AssigneeBlackBerry Limited
InventorsNagula Tharma Sangary, Sean Bartholomew Simmons, David Blaine Dietz, Perry Jarmuszewski, Oleksiy Kravets
Life of this patent
Estimating the term…
Abstract
A speed parameter or channel quality parameter are determined in a mobile device based on variation in frequency offset measurement. A higher variation in the frequency offset measurement reflects a poorer channel quality and a higher speed; a lower variation in the frequency offset measurement reflects a better channel quality and a lower speed. The parameter(s) may be fed back to the system and used, for example, to make adaptive modulation and coding decisions.
Claims13
A method comprising:
- receiving a signal over a wireless communications channel;
- making a plurality of frequency offset measurements in respect of the signal;
- estimating a PDF of the frequency offset measurements;
- determining at least one of a channel quality parameter and a speed parameter as a function of the PDF;
- determining the measure of variation from the PDF.
A method comprising:
- receiving a signal over a wireless communications channel;
- making a plurality of frequency offset measurements in respect of the signal;
- determining differences between consecutive frequency offset measurements;
- determining at least one of a channel quality parameter and a speed parameter as a function of the differences between consecutive frequency offset measurements.
A mobile device comprising:
- at least one antenna for receiving a signal;
- a local frequency source;
- a frequency offset determiner configured to determine frequency offset measurements between a frequency of the local frequency source and a frequency of the signal;
- a parameter determiner configured to determine a PDF of the frequency offset measurements and to determine at least one of a channel quality parameter and a speed parameter as a function of the PDF.
A mobile device comprising:
- at least one antenna for receiving a signal;
- a local frequency source;
- a frequency offset determiner configured to determine frequency offset measurements between a frequency of the local frequency source and a frequency of the signal;
- a parameter determiner configured to determine differences between consecutive frequency offset measurements and at least one of a channel quality parameter and a speed parameter as a function of the differences between frequency offset measurements.
A computer readable medium having instructions stored thereon for execution by a mobile device, that when executed, cause the mobile device to execute a method comprising, in respect of a signal received over a wireless communications channel:
- making a plurality of frequency offset measurements in respect of the signal;
- estimating a PDF of the frequency offset measurements;
- determining at least one of a channel quality parameter and a speed parameter as a function of the PDF.
Dependencies are inferred from the claim text.