Radio receiver with frequency segment offset compensation and related methods

Patent metadata

Field	Value
Publication number	US-2024333573-A1
Application number	US-202418618415-A
Country	US
Kind code	A1
Filing date	Mar 27, 2024
Priority date	Mar 31, 2023
Publication date	Oct 3, 2024
Grant date	—

Abstract

Aspects of this disclosure relate to frequency offset compensation in a radio receiver. In embodiments of the disclosure, a frequency domain orthogonal frequency-division multiplexing signal can be received, and a phase error offset in individual frequency segments of the frequency domain orthogonal frequency-division multiplexing signal can be compensated for based on estimates of the phase error offset for the individual frequency segments. Related radio receivers and radio systems are disclosed.

First claim

What is claimed is:

1 . A method of frequency offset compensation in a radio receiver, the method comprising:
receiving a frequency domain orthogonal frequency-division multiplexing signal in the radio receiver; and compensating, in the radio receiver, for a phase error offset in individual frequency segments of the frequency domain orthogonal frequency-division multiplexing signal based on estimates of the phase error offset for the individual frequency segments.

2 . The method of claim 1 further comprising generating the estimates of the phase error offset for the individual frequency segments with a plurality of phase error offset estimation circuits, each of the plurality of phase error offset estimation circuits being associated with a respective frequency segment of the individual frequency segments.

3 . The method of claim 2 further comprising filtering the estimates of the phase error offset with respective loop filters, the compensating being based on outputs of the loop filters.

4 . The method of claim 1 wherein the compensating for the phase error offset is applied before equalizing the frequency domain orthogonal frequency-division multiplexing signal.

5 . The method of claim 1 further comprising generating the estimates of the phase error offset using average phase error estimation.

6 . The method of claim 1 further comprising compensating, in the radio receiver, for a carrier frequency offset in a time domain orthogonal frequency-division multiplexing signal based on an estimate of the carrier frequency offset; and generating, in the radio receiver, the frequency domain orthogonal frequency-division multiplexing signal from the time domain orthogonal frequency-division multiplexing signal.

7 . The method of claim 1 further comprising storing time domain orthogonal frequency-division multiplexing symbols in a buffer, the buffer having an output coupled to an input of a Fourier transform engine that generates the frequency domain orthogonal frequency-division multiplexing signal.

8 . The method of claim 1 further comprising generating, with a Fourier transform engine, the frequency domain orthogonal frequency-division multiplexing signal from a time domain orthogonal frequency-division multiplexing signal.

9 . The method of claim 1 wherein the frequency domain orthogonal frequency-division multiplexing signal is a Digital Audio Broadcasting signal.

10 . A radio receiver with frequency offset compensation, the radio receiver comprising:
a Fourier transform engine configured to convert a time domain orthogonal frequency-division multiplexing signal into frequency domain orthogonal frequency-division multiplexing signal; and a compensation loop configured to apply phase error offset compensation to individual frequency segments of the frequency domain orthogonal frequency-division multiplexing signal, the compensation loop including a plurality of phase error offset estimation circuits and a plurality of loop filters.

11 . The radio receiver of claim 10 further comprising a plurality of phase rotators and an equalizer, the plurality of phase rotators being in a signal path from the Fourier transform engine to the equalizer, and the plurality of phase rotators being connected to outputs of the plurality of loop filters.

12 . The radio receiver of claim 11 wherein the plurality of phase error offset estimation circuits are in signal paths between the equalizer and the plurality of loop filters.

13 . The radio receiver of claim 10 further comprising another compensation loop configured to compensate for carrier frequency offset in the time domain orthogonal frequency-division multiplexing signal.

14 . The radio receiver of claim 13 wherein the another compensation loop includes a carrier frequency offset estimation circuit and another loop filter.

15 . The radio receiver of claim 10 further comprising a buffer configured to store time domain orthogonal frequency-division multiplexing symbols, the buffer having an output coupled to an input of the Fourier transform engine.

16 . The radio receiver of claim 10 wherein the plurality of phase error offset estimation circuits includes at least 4 phase error offset estimation circuits.

17 . The radio receiver of claim 10 wherein phase error offset in the frequency domain orthogonal frequency-division multiplexing signal is frequency selective.

18 . A radio system with frequency offset compensation and phase error compensation, the radio system comprising:
at least one antenna configured to receive a radio signal, the radio signal being an orthogonal frequency-division multiplexing signal; and a radio receiver including a compensation loop, the compensation loop configured to apply phase offset compensation to individual frequency segments of the radio signal in frequency domain circuitry.

19 . The radio system of claim 18 wherein the radio receiver further comprises another compensation loop configured to compensate for carrier frequency offset in the radio signal in time domain circuitry.

20 . The radio system of claim 18 further comprising a speaker in communication with the radio receiver.

Assignees

• Skyworks Solutions Inc

Inventors

• Kleinerman Alexander
• Wallace Bradley Arthur

Classifications

• H04L27/2657

  Carrier synchronisation · CPC title

• H04L27/0014

  Carrier regulation (of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657) · CPC title

• H04L2027/0026

  Correction of carrier offset · CPC title

• H04L27/2647 Primary

  Arrangements specific to the receiver only (equalisation H04L27/01) · CPC title

• H04L27/2621

  Reduction thereof using phase offsets between subcarriers · CPC title