Patent ID: 11888661
Assignee: U-BLOX AG
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 0:
1. A method of demodulating a wireless signal modulated by phase-shift keying, the wireless signal comprising a plurality of symbols, the method comprising:
obtaining a first sequence of samples based on the wireless signal;
converting the first sequence of samples to a first sequence of frequency domain samples;
selecting, as a decision variable, a sample that has a maximum magnitude among the first sequence of the frequency domain samples; and
identifying a symbol or a symbol-transition based on the decision variable,
wherein the first sequence of samples starts at a start of a symbol period, and the method further comprises:
obtaining a second sequence of samples based on the wireless signal, wherein the second sequence of samples ends at the start of the symbol period;
reversing the second sequence of samples relative to the first sequence of samples;
converting the reversed second sequence of samples to a second sequence of frequency domain samples; and
selecting, as a reference variable, a sample that has a maximum magnitude among the second sequence of frequency domain samples,
wherein the identifying the symbol or the symbol-transition comprises comparing the decision variable with the reference variable.