Frequency offset estimation and compensation for high performance wireless communications in substation automation

A packet receiver for frequency offset estimation in a wireless communication network that employs time based scheduling of packets, the packet receiver comprising processing circuitry that is configured to cause the packet receiver to:

• receive a packet from a packet transmitter, wherein the packet comprises a preamble that is composed of samples of a single orthogonal frequency-division multiplexing (OFDM) symbol, the preamble having a cyclic prefix (CP) defined by a repetition of samples from an end-portion of the preamble, wherein the preamble, except for the CP, is free from any repeated sequence of samples;
• determine a sequence of similarity measure values between the CP of the preamble and the end-portion of the preamble;
• apply a low-pass filter to the sequence of similarity measure values, resulting in a filtered sequence of similarity measure values, the filtered sequence of similarity measure values depending on a previously determined sequence of similarity measure values, the previously determined sequence of similarity measure values being determined at least in part from a previously-received packet from the packet transmitter;
• and
• perform frequency offset estimation on the filtered sequence of similarity measure values.

A non-transitory storage medium storing a computer program for frequency offset estimation in a wireless communication network that employs time based scheduling of packets, the computer program comprising computer code which, when run on processing circuitry of a packet receiver, causes the packet receiver to:

• receive a packet from a packet transmitter, wherein the packet comprises a preamble that is composed of samples of a single orthogonal frequency-division multiplexing (OFDM) symbol, the preamble having a cyclic prefix (CP) defined by a repetition of samples from an end-portion of the preamble, wherein the preamble, except for the CP, is free from any repeated sequence of samples;
• determine a sequence of similarity measure values between the CP of the preamble and the end-portion of the preamble, the sequence of similarity measure values depending on a previously determined sequence of similarity measure values;
• apply a low-pass filter to the sequence of similarity measure values, resulting in a filtered sequence of similarity measure values, the filtered sequence of similarity measure values depending on a previously determined sequence of similarity measure values, the previously determined sequence of similarity measure values being determined at least in part from a previously-received packet from the packet transmitter;
• and
• perform frequency offset estimation on the filtered sequence of similarity measure values.