Receiver, frequency spectrum reproduction method, and frequency spectrum reproduction program

The described receiver addresses the inaccuracy in conventional RF spectrum reproduction by employing transfer function measurements and complex conjugate corrections to achieve accurate and low-noise spectrum reconstruction, particularly at high frequencies.

JP7873488B2Active Publication Date: 2026-06-12TOHOKU UNIV
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOHOKU UNIV
Filing Date
2022-12-28
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Conventional RF spectrum reproduction methods using direct RF undersampling fail to accurately capture the characteristics of received RF signals, particularly at high frequencies, due to the setting of the coupling matrix element to 1, leading to potential errors in signal input to the ADC.

⚗Method used

A receiver that performs frequency spectrum reproduction using an undersampling reception method, involving a processing device that measures transfer function characteristics, applies Fourier transforms, generates a coefficient matrix, and uses a compressive sensing or least squares method to correct for aliasing, ensuring accurate spectrum reconstruction by considering the differences in transfer functions across multiple ADC paths.

🎯Benefits of technology

Enables low-noise spectrum reproduction processing by accurately representing the characteristics of received RF signals, even at high frequencies, by iteratively correcting for aliasing and transfer function discrepancies using complex conjugate relationships.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To implement low-noise spectrum reproduction processing.SOLUTION: A transfer function characteristic H(ω) of a circuit from a common branch point of a radio frequency to a circuit, which performs sampling processing, is measured beforehand. A frequency spectrum from 0 to a Nyquist frequency group is acquired by performing sampling in K kinds of sampling frequencies and independently performing Fourier transformation. Frequency pitch widths of K kinds of frequency spectrums are set equal, and a vector (y) in which frequency spectrum elements are coupled is generated. A solution (x) of (y)=(A)(x) is calculated by generating a coefficient matrix (A) in which matrix elements corresponding to a frequency element corresponding to a frequency corresponding to a frequency group given by resolution corresponding to the frequency pitch width in frequencies from 0 to an upper limit frequency of a receiver and a loopback frequency in the Nyquist frequency group and the element of (y) are made into characteristics corresponding to the radio frequency in the previously measured transfer function characteristics and other elements are set to zero.SELECTED DRAWING: Figure 1
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