Patent ID: 9722833
Date: 2017-08-01
CPC Classifications: H04L

Claim:
1. A frequency shift key (FSK) receiver comprising: a phase compensator that performs phase compensation on a FSK signal received by the FSK receiver, wherein the FSK signal includes a preamble, and wherein the phase compensator sets compensation vectors for samples of bits in the preamble in response to analyzing the preamble and performs the phase compensation by determining phase differences of compensated samples and adjacent samples of bits in the preamble, wherein determining the phase differences includes calculating the difference on a compensated sample and a subsequent sample for each preamble bit; a demodulator that demodulates the FSK signal; and frequency offset determination logic that determines a frequency offset based at least partially upon a phase offset determined from an output of the demodulator; whereby the FSK receiver applies the frequency offset to the FSK signal, the phase compensating is performed before the FSK signal is demodulated by the demodulator, and the frequency offset is determined after the FSK signal is demodulated by the demodulator.