Patent ID: 9106485
Filing Date: 2015-08-11
Classification: H04L,H04W

Abstract:
1. A device, comprising: an input configured to receive an input signal, the input signal being modulated by frequency shift keying (FSK) and encoding data at a first frequency and a second frequency; a first estimator configured to detect a first signal at the first frequency; a second estimator configured to detect a second signal at the second frequency; a third estimator configured to detect a third signal at a third frequency, wherein detection of the third signal is indicative of receipt of the first signal; a fourth estimator configured to detect a fourth signal at a fourth frequency, wherein detection of the fourth signal is indicative of receipt of the second signal; and an output logic block configured to analyze outputs of the first estimator, the second estimator, the third estimator, and the fourth estimator to generate an output indicating receipt of the data encoded at the first frequency or the second frequency.