Granted Patent B2

US 12,261,722 · App. 18/089,698 · Granted Mar 25, 2025

Inventors: Jun Il Ahn (Daejeon, KR); Sung Jin Jo (Daejeon, KR); Chang Hun Lee (Daejeon, KR); Sun Phil Nah (Daejeon, KR)

Assignee: AGENCY FOR DEFENCE DEVELOPMENT

H04L25/0242H04L25/03872

Abstract

Claims (48)

1. A method of processing a signal in a compressive sensing receiver, the method comprising:

obtaining a first signal received via an antenna;

generating a first baseband signal by mixing the first signal with a second signal generated by a local oscillator based on a pseudo random binary sequence (PRBS);

removing a spurious component from the first baseband signal based on a value which is obtained by estimating the spurious component generated by the local oscillator and is stored in advance;

detecting a spectral slice including the first signal based on the first baseband signal from which the spurious component is removed and a measurement matrix, and

calibrating the measurement matrix using a calibration signal generated based on a bit pattern length of the pseudo random binary sequence and a reception frequency band.

2. The method of claim 1 , wherein the first signal includes a plurality of radio-frequency (RF) signals,

wherein the value is a spurious component average value obtained by estimating spurious component values generated by the local oscillator and calculating an average thereof, and

wherein the generating the first baseband signal includes:

mixing the first signal with the second signal; and

generating the first baseband signal by filtering the mixed signal using a low-pass filter.

3. The method of claim 2 , wherein the calibrating of the measurement matrix includes:

mixing the calibration signal with the second signal to generate a second baseband signal;

sampling the second baseband signal;

filtering the sampled second baseband signal with a finite impulse response filter and performing a Fast Fourier transform on the filtered sampled second baseband signal;

removing the spurious component from the transformed second baseband signal based on the stored spurious component average value;

performing the Fast Fourier transform on the second baseband signal from which the spurious component is removed;

extracting a signal of a frequency band in which the calibration signal is included from the second baseband signal subjected to the Fast Fourier transform; and

calibrating the measurement matrix based on a result obtained by decomposing a singular value from the extracted signal.

4. The method of claim 3 , wherein the detecting of the spectral slice includes:

detecting the spectral slice based on the first baseband signal from which the spurious component is removed and the calibrated measurement matrix.

5. The method of claim 3 , wherein the extracting of the signal of the frequency band in which the calibration signal is included, includes:

extracting a signal of a frequency band that is shifted by a preset offset from a central frequency of each of bands obtained by dividing a reception frequency band for the first signal by a predetermined bit pattern length of the pseudo random binary sequence.

6. A compressive sensing receiver of processing a signal, comprising:

a receiver configured to obtain a first signal received via an antenna;

a memory storing a spurious component estimation value and a measurement matrix; and

at least one processor configured to perform: generating a first baseband signal by mixing the first signal with a second signal generated by a local oscillator based on a pseudo random binary sequence; removing a spurious component from the first baseband signal based on the spurious component estimation value which is obtained by estimating the spurious component generated by the local oscillator and is stored in advance; detecting a spectral slice including the first signal based on the first baseband signal from which the spurious component is removed and the measurement matrix; and calibrating the measurement matrix using a calibration signal generated based on a bit pattern length of the pseudo random binary sequence and a reception frequency band.

7. The compressive sensing receiver of claim 6 , wherein the first signal received by the receiver includes a plurality of radio frequency (RF) signals,

wherein the spurious component estimation value is a spurious component average value obtained by estimating spurious component values generated by the local oscillator and calculating an average thereof, and

wherein the at least one processor is configured to perform:

mixing the first signal with the second signal; and

generating the first baseband signal by filtering the mixed signal using a low-pass filter.

8. The compressive sensing receiver of claim 7 , wherein the at least one processor is configured to perform:

mixing the calibration signal with the second signal to generate a second baseband signal;

sampling the second baseband signal;

filtering the sampled second baseband signal with a finite impulse response filter and performing a Fast Fourier transform on the filtered sampled second baseband signal;

removing the spurious component from the transformed second baseband signal based on the stored spurious component average value;

performing the Fast Fourier transform on the second baseband signal from which the spurious component is removed;

extracting a signal of a frequency band in which the calibration signal is included from the second baseband signal subjected to the Fast Fourier transform; and

calibrating the measurement matrix based on a result obtained by decomposing a singular value from the extracted signal.

9. The compressive sensing receiver of claim 8 , wherein the at least one processor is configured to detect the spectral slice including the first signal based on the first baseband signal from which the spurious component is removed and the calibrated measurement matrix.

10. The compressive sensing receiver of claim 8 , wherein the at least one processor is configured to extract a signal of a frequency band that is shifted by a preset offset from a central frequency of each of bands obtained by dividing a reception frequency band for the first signal by a predetermined bit pattern length of the pseudo random binary sequence.

11. A non-transitory computer-readable storage medium storing instructions, wherein when the instructions are performed by at least one of processor included in a compressive sensing receiver, the compressive sensing receiver is caused to execute:

obtaining a first signal received via an antenna;

generating a first baseband signal by mixing the first signal with a second signal generated by a local oscillator based on a pseudo random binary sequence (PRBS);

removing a spurious component from the first baseband signal based on a value which is obtained by estimating the spurious component generated by the local oscillator and is stored in advance;

detecting a spectral slice including the first signal based on the first baseband signal from which the spurious component is removed and a measurement matrix; and

calibrating the measurement matrix using a calibration signal generated based on a bit pattern length of the pseudo random binary sequence and a reception frequency band.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (9)