Communication method and reception apparatus
View Patent ↗An electronic device that digitizes a baseband signal obtained from a received high-frequency signal; specifies a position of a preamble included in the digitalized signal; calculates a square of the preamble; specifies a peak from a value obtained by the square of the preamble; performs a fast Fourier transform (FFT) on the baseband signal using a position of the peak as a start of an FFT window; extracts phases of a plurality of frequency components for phase measurement from the baseband signal which has been subjected to the FFT; obtains a phase difference of the plurality of phases; and obtains a phase correction value of a reception signal using the phase difference and a phase reference.
1. An electronic device comprising:
a first antenna configured to receive a first high-frequency signal;
a second antenna configured to receive a second high-frequency signal: and
circuitry configured to:
generate a first digitized baseband signal from the first high-frequency signal;
generate a second digitized baseband signal from the second high-frequencv signal;
specify a position of a preamble included in the first digitalized baseband signal;
calculate a square signal of an autocorrelation of the preamble;
specify a peak value obtained by the square signal of the autocorrelation of the preamble;
perform a fast Fourier transform (FFT) on the first digitized baseband signal using a position of the peak value as a start of an FFT window;
extract a plurality of phases of a plurality of frequency components for phase measurement from the first digitized baseband signal which has been subjected to the FFT;
obtain a phase difference of the plurality of phases;
determine a relative delay between the first high-frequency signal and the second high-frequency signal based on the phase difference and a phase reference; and
demodulate the first digitized baseband signal and the second digitized baseband signal based on the relative delay.
2. The electronic device of claim 1 , wherein the plurality of frequency components includes a first frequency component (f 0 ), a second frequency component (f 1 ) and a third frequency component (f 2 ).
3. The electronic device of claim 2 , wherein the circuitry is configured to obtain the phase difference according to the following formula:
Phase Difference =[((Phase of f1)−(Phase of f0))/(f1−f0)]×(f2−f0)−(Phase of f2).
4. The electronic device of claim 3 , wherein the circuitry is configured to obtain the phase reference according to the following formula:
Phase Reference =(360×f0)/inverse fast Fourier transform (IFFT) size.
5. The electronic device of claim 4 , wherein the circuitry is configured to determine the relative delay based on a phase correction value obtained according to the following formula:
Phase Correction Value =mod(Phase Difference/Phase Reference), wherein
mod denotes a residue of the division between the phase difference and the phase reference.
6. The electronic device of claim 2 , wherein the first frequency component (f 0 ), the second frequency component (f 1 ) and the third frequency component (f 2 ) are each assigned to a same preamble time slot in the first high-frequency signal.
7. The electronic device of claim 1 , wherein the plurality of frequency components includes a first frequency component (f 0 ) and a second frequency component (f 2 ).
8. The electronic device of claim 7 , wherein the circuitry is configured to obtain the phase difference according to the following formula:
Phase Difference =(Phase of f0)−(Phase of f2).
9. The electronic device of claim 8 , wherein the circuitry is configured to obtain the phase reference according to the following formula:
Phase Reference =(360×f0)/inverse fast Fourier transform (IFFT) size.
10. The electronic device of claim 9 , wherein the circuitry is configured to determine the relative delay based on a phase correction value obtained according to the following formula:
Phase Correction Value =mod(Phase Difference/Phase Reference), wherein
mod denotes a residue of the division between the phase difference and the phase reference.
11. The electronic device of claim 7 , wherein the first frequency component (f 0 ) and the second frequency component (f 2 ) are each assigned to a same preamble time slot in the first high-frequency signal.
12. The electronic device of claim 7 , wherein the first frequency component (f 0 ) and the second frequency component (f 2 ) are each assigned to consecutive time slots in the first high-frequency signal.
13. A method performed by an electronic device, the method comprising:
receiving a first high-frequency signal through a first antenna; receiving a second high-frequency signal through a second antenna;
generating a first digitized baseband signal from the first high-frequency signal;
generating a second digitized baseband signal from the second high-frequency signal;
specifying a position of a preamble included in the first digitalized baseband signal;
calculating a square signal of an autocorrelation of the preamble;
specifying a peak value obtained by the square signal of the autocorrelation of the preamble;
performing a fast Fourier transform (FFT) on the first digitized baseband signal using a position of the peak value as a start of an FFT window;
extracting, by circuitry of the electronic device, a plurality of phases of a plurality of frequency components for phase measurement from the first digitized baseband signal which has been subjected to the FFT;
obtaining, by the circuitry, a phase difference of the plurality of phases;
determining a relative delay between the first high-frequency signal and the second high-frequency signal based on the phase difference and a phase reference; and
demodulating the first digitized baseband signal and the second digitized baseband signal based on the relative delay.
14. The method of claim 13 , wherein the plurality of frequency components includes a first frequency component (f 0 ), a second frequency component (f 1 ) and a third frequency component (f 2 ).
15. The method according to claim 14 , wherein the phase difference is obtained according to the following formula:
Phase Difference =[((Phase of f1)−(Phase of f0))/(f1−f0)]×(f2−f0)−(Phase of f2),
the phase reference is obtained according to the following formula:
Phase Reference =(360×f0)/inverse fast Fourier transform (IFFT) size, and
the relative delay is determined based on a phase correction value obtained according to the following formula:
Phase Correction Value =mod(Phase Difference/Phase Reference), wherein
mod denotes a residue of the division between the phase difference and the phase reference.
16. The method according to claim 14 , wherein the first frequency component (f 0 ), the second frequency component (f 1 ) and the third frequency component (f 2 ) are each assigned to a same preamble time slot in the first high-frequency signal.
17. The method of claim 13 , wherein the plurality of frequency components includes a first frequency component (f 0 ) and a second frequency component (f 2 ).
18. The method according to claim 17 , wherein
the phase difference is obtained according to the following formula:
Phase Difference =(Phase of f0)−(Phase of f2),
the phase reference is obtained according to the following formula:
Phase Reference =(360×f0)/inverse fast Fourier transform (IFFT) size, and
the relative delay is determined based on a phase correction value obtained according to the following formula:
Phase Correction Value =mod(Phase Difference/Phase Reference), wherein
mod denotes a residue of the division between the phase difference and the phase reference.
19. The method according to claim 17 , wherein the first frequency component (f 0 ) and the second frequency component (f 2 ) are each assigned to a same preamble time slot in the first high-frequency signal.