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

Claim 8:
9. A demodulator for a wireless signal modulated by phase-shift keying, the wireless signal comprising a plurality of symbols, the demodulator comprising:
an input, configured to obtain a first sequence of samples based on the wireless signal;
a first frequency-transform block, configured to convert the first sequence of samples to a first sequence of frequency domain samples;
a first selection block, configured to select, as a decision variable, a sample that has a maximum magnitude among the first sequence of frequency domain samples; and
a decision block, configured to identify 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 input is configured to obtain a second sequence of samples based on the wireless signal, wherein the second sequence of samples ends at the start of the symbol period,
wherein the demodulator further comprises:
a reversal block, configured to reverse the second sequence of samples relative to the first sequence of samples;
a second frequency-transform block, configured to convert the reversed second sequence of samples to a second sequence of frequency domain samples; and
a second selection block, configured to select, as a reference variable, a sample that has a maximum magnitude among the second sequence of frequency domain samples, and
wherein the decision block is configured to identify the symbol or symbol-transition by comparing the decision variable with the reference variable.