Patent ID: 8862084
Filing Date: 2014-10-14
Classification: H04B

Abstract:
1. A method of measuring a quality of a receiver having an input, a decoder, and an output, the method comprising: providing a test signal to the input, the test signal being representative of communication signals handled by the receiver; sampling, before the decoder, a signal generated by frequency-dependent components of the receiver from the test signal, thereby forming a sampled signal; and generating an estimate of the quality of the receiver based on a quality of the sampled signal, wherein the quality of the sampled signal is representative of a quality of a received signal at the output of the receiver; generating the estimate includes comparing the sampled signal with a reference signal that represents the test signal provided to the input after processing by nominal frequency-dependent components and sampled before the decoder, and the estimate of the quality of the receiver is based on a difference between the sampled signal and the reference signal; and the estimate of the quality of the receiver is based on a function of the difference between the sampled signal and the reference signal; the function includes an error vector modulation (EVM) function; and generating the estimate includes: forming a corrected sampled signal by at least a plurality of: determining a time offset between the corrected sampled signal and the reference signal, wherein determining the time offset includes sliding a time-correlation of the corrected sampled signal against the reference signal; and computing an EVM value as the estimate.