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US 9,184,804 B2Granted
Method and apparatus for implementing signal quality metrics and antenna diversity switching control
AssigneeiBiquity Digital Corporation
InventorsBrian W. Kroeger, Paul J. Peyla
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Abstract
A method for detecting the digital quality of a radio signal includes: receiving a radio signal including a digital portion modulated by a series of symbols each including a plurality of samples; computing correlation points between endpoint samples in cyclic prefix regions of adjacent symbols; and using the correlation points to produce a digital signal quality metric. Receivers that implement the method are also provided.
Claims4
A method comprising:
- receiving a radio signal including a digital portion modulated by a series of symbols each including a plurality of samples;
- computing correlation points between endpoint samples in cyclic-prefix regions of adjacent symbols;
- and
- using the correlation points to produce a digital signal quality metric, wherein the radio signal includes upper and lower sidebands and the step of computing correlation points comprises:
- placing the endpoint samples for symbols received on the upper and lower sidebands in vectors;
- frequency shifting the sideband vectors to center them at 0 Hz;
- lowpass filtering the vectors;
- performing a conjugate multiply and fold operation on the vectors to produce correlation vector results for the upper and lower sidebands;
- normalizing the correlation results to produce normalized correlation results;
- using the correlation vector results and the normalized correlation results to produce a quality value for the upper and lower sidebands;
- and
- using the quality value for the upper and lower sidebands to produce a digital signal quality metric.
9 more elements
An apparatus comprising:
- a radio receiver including an input for receiving a radio signal having a digital portion modulated by a series of symbols, each including a plurality of samples, and a processor for computing correlation points between samples in cyclic-prefix regions of the symbols to produce a digital signal quality metric, wherein the processor places the endpoint samples for symbols received on the upper and lower sidebands in vectors;
- frequency shifts the sideband vectors to center them at 0 Hz;
- lowpass filters the vectors;
- performs a conjugate multiply and fold operation on the vectors to produce correlation vector results for the upper and lower sidebands;
- normalizes the correlation results to produce normalized correlation results;
- uses the correlation vector results and the normalized correlation results to produce a quality value for the upper and lower sidebands;
- and uses the quality value for the upper and lower sidebands to produce a digital signal quality metric.
4 more elements
Dependencies are inferred from the claim text.