US 10,708,107 B1 · Method and decoder for suppressing phase noise in an orthogonal frequency division multiplexing signal

Abstract

Phase noise (PN) is suppressed in an OFDM signal. In an initial iteration, an estimation of the PN samples in an OFDM signal vector is produced and the OFDM signal is demodulated using the initial estimation of the PN to generate constellation symbols for the initial iteration. In an additional iteration, an Inverse Fast Fourier Transform of constellation symbols generated in a preceding iteration is calculated to reconstruct preceding samples of the transmitted signal vector. A PN effect on the reconstructed samples is estimated. A next estimation of the PN in a next signal vector is produced based on the estimated PN effect on the reconstructed samples. The next signal vector is demodulated using the next estimation of the PN to generate constellation symbols for the additional iteration. A predetermined maximum number of additional iterations may be used.

Claims21

Dependent claims

A method for suppressing phase noise in an orthogonal frequency division multiplexing (OFDM) signal, comprising:

in an initial iteration:
producing an initial estimation of the phase noise in initial samples of an OFDM signal vector, and
demodulating the initial samples of the OFDM signal vector using the initial estimation of the phase noise to generate constellation symbols for the initial iteration;
and
in at least one additional iteration following the initial iteration:
calculating an Inverse Fast Fourier Transform (IFFT) of constellation symbols generated in a preceding iteration to reconstruct samples of the OFDM signal vector demodulated in the preceding iteration,
estimating a phase noise effect on the reconstructed samples of the OFDM signal vector,
producing a next estimation of the phase noise in next samples of the OFDM signal vector based on the estimated phase noise effect on the reconstructed samples of the OFDM signal vector, and
demodulating the next samples of the OFDM signal vector using the next estimation of the phase noise to generate constellation symbols for the at least one additional iteration.

6 more elements

A decoder for suppressing phase noise in an orthogonal frequency division multiplexing (OFDM) signal, comprising:

a local oscillator adapted to convert an OFDM signal to an OFDM signal vector;
an OFDM demodulator adapted to demodulate the OFDM signal vector to produce demodulated samples of the OFDM signal vector using a supplied phase noise estimation;
a slicer adapted to generate constellation symbols from the demodulated samples of the OFDM signal vector;
and
a processing unit operatively connected to the local oscillator, to the OFDM demodulator and to the slicer, the processing unit being adapted to, in an initial iteration:
produce an initial estimation of the phase noise in initial samples of the OFDM signal vector, and
supply the initial estimation of the phase noise to the OFDM demodulator;
the processing unit being further adapted to, in at least one additional iteration following the initial iteration:
calculate an Inverse Fast Fourier Transform (IFFT) of constellation symbols generated in a preceding iteration to reconstruct samples of the OFDM signal vector demodulated in the preceding iteration,
estimate a phase noise effect on the reconstructed samples of the OFDM signal vector,
produce a next estimation of the phase noise in next samples of the OFDM signal vector based on the estimated phase noise effect on the reconstructed samples of the OFDM signal vector, and
supply the next estimation of the phase noise to the OFDM demodulator.

9 more elements

Dependencies are inferred from the claim text.

Method and decoder for suppressing phase noise in an orthogonal frequency division multiplexing signal

Life of this patent

Method and decoder for suppressing phase noise in an orthogonal frequency division multiplexing signal

Life of this patent

Abstract

Claims21