Method and apparatus for implementing signal quality metrics and antenna diversity switching control

摘要

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.

主权项

1. 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; andusing the quality value for the upper and lower sidebands to produce a digital signal quality metric.