US 11,637,575 B2Granted

Wireless communication apparatus and wireless communication method

AssigneeNippon Telegraph and Telephone Corporation

InventorsAtsushi Ota, Kota Ito, Kazuto Goto, Yushi Shirato, Naoki Kita

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Abstract

A first wireless communication apparatus assigns a pilot signal without an effective signal component at least in an adjacent frequency component to a generated transmit signal, and transmits the transmit signal including the pilot signal. A second wireless communication apparatus converts the received signal or a frequency-converted signal obtained by frequency conversion of the signal into a signal in a frequency domain, sets an approximate value of the distance between the second wireless communication apparatus and the first wireless communication apparatus, calculates a coefficient γk, based on the approximate value of the distance, the effective bandwidth, the speed of light, the number of FFT points, and the frequency component number, extracts a signal in the frequency domain, generates a phase noise compensated sampling signal, and reproduces data transmitted by the first wireless communication apparatus.

Claims7

Dependent claims

A wireless communication apparatus in a wireless communication system including a first wireless communication apparatus and a second wireless communication apparatus,

the first wireless communication apparatus comprising:
a processor;
and
a storage medium having computer program instructions stored thereon, when executed by the processor, perform to:
generate a transmit signal including information to be transmitted in a region or a portion of the region excluding an empty region within an effective bandwidth, the empty region being a predetermined frequency region within the effective bandwidth;
generate a pilot signal without an effective signal component at least in an adjacent frequency component to a predetermined frequency component within the effective bandwidth and assign the pilot signal to the transmit signal;
and
transmit the transmit signal including the pilot signal generated by the pilot signal assigning section at a wireless frequency, and
the second wireless communication apparatus comprising:
a processor;
and
a storage medium having computer program instructions stored thereon, when executed by the processor, perform to:
receive a signal of the wireless frequency;
convert the received signal received by the reception section or a frequency-converted signal obtained by frequency conversion of the received signal from a sampling signal in a time domain to a signal in a frequency domain;
set an approximate value L′ of a distance between the second wireless communication apparatus and the first wireless communication apparatus;
calculate a coefficient γk given by Equation (1) below for the approximate value L′ of the distance, an effective bandwidth W, a speed of light c, a number of FFT points NFFT, and a frequency component number k;
extract, a signal in a frequency domain including a frequency component of the pilot signal and a plurality of peripheral frequency components including at least adjacent frequency components of the pilot signal, and generate a replica of phase noise, based on a coefficient for each frequency component of the extracted signal and the coefficient γk;
generate a phase noise compensated sampling signal by using the replica of the phase noise and the sampling signal in the time domain or a sampling signal modified based on the sampling signal in the time domain;
and
reproduce data transmitted by the first wireless communication apparatus, based on an output signal from the phase noise compensation section
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46 more elements

A wireless communication method performed by a wireless communication apparatus in a wireless communication system including a first wireless communication apparatus and a second wireless communication apparatus, the wireless communication method comprising:

generating, by the first wireless communication apparatus, a transmit signal including information to be transmitted in a region or a portion of the region excluding an empty region within an effective bandwidth, the empty region being a predetermined frequency region within the effective bandwidth;
generating, by the first wireless communication apparatus, a pilot signal without an effective signal component at least in an adjacent frequency component to a predetermined frequency component within the effective bandwidth and assigning the pilot signal to the transmit signal generated by the generating of the transmit signal;
transmitting, by the first wireless communication apparatus, the transmit signal including the pilot signal generated by the assigning of the pilot signal at a wireless frequency;
receiving, by the second wireless communication apparatus, a signal of the wireless frequency;
converting, by the second wireless communication apparatus, the received signal received by the receiving or a frequency-converted signal obtained by frequency conversion of the received signal from a sampling signal in a time domain to a signal in a frequency domain;
setting, by the second wireless communication apparatus, an approximate value L′ of a distance between the second wireless communication apparatus and the first wireless communication apparatus;
calculating, by the second wireless communication apparatus, a coefficient γk given by Equation (5) below for the approximate value L′ of the distance, an effective bandwidth W, a speed of light c, a number of FFT points NFFT of the time/frequency conversion section, and a frequency component number k;
extracting, by the second wireless communication apparatus, from an output in the converting of the signal, a signal in a frequency domain including a frequency component of the pilot signal and a plurality of peripheral frequency components including at least adjacent frequency components of the pilot signal, and generating a replica of phase noise, based on a coefficient for each frequency component of the extracted signal and the coefficient γk;
generating, by the second wireless communication apparatus, a phase noise compensated sampling signal by using the replica of the phase noise and the sampling signal in the time domain or a sampling signal modified based on the sampling signal in the time domain;
and
reproducing, by the second wireless communication apparatus, data transmitted by the first wireless communication apparatus, based on an output signal in the compensating of the phase noise
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37 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/257,269Filed 26 Jun 2019
Priority: JP JP2018-1278814 Jul 2018
Published: US 2021/0281453 A19 Sep 2021
Granted: 25 Apr 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04B 1/10
Receivers: means associated with receiver for limiting or suppressing noise or interference
H04L 27/261
Signal structure: details of reference signals
H04L 27/265
Demodulators: fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
H04L 27/26524
Demodulators: fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation