A frequency domain receiving method and device of a multicarrier signal

By using windowing processing and least-squares pseudo-inverse matrix in multi-carrier signal reception, the frequency domain complex amplitude is directly estimated in the time domain, solving the problem of DQPSK decision performance degradation caused by carrier frequency offset and interference, and realizing robust frequency domain reception and low computational complexity of complex amplitude estimation.

CN122137715APending Publication Date: 2026-06-02NEXWISE INTELLIGENCE CHINA LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NEXWISE INTELLIGENCE CHINA LTD
Filing Date
2026-05-06
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In the presence of carrier frequency offset, Doppler frequency offset, or narrowband interference, the DQPSK decision performance of multi-carrier signals is affected by mutual interference, and the FFT phase calculation method is limited by the picket fence effect, resulting in phase estimation errors.

Method used

Complex amplitude estimation is performed using the least-squares pseudo-inverse matrix with windowing. By multiplying the least-squares pseudo-inverse matrix of the pre-calculated window-weighted matrix with the time-domain data frame, the frequency-domain complex amplitude is directly estimated in the time domain, eliminating phase estimation errors. Furthermore, decision stability is improved through inter-frame phase difference compensation.

Benefits of technology

It significantly reduces the amount of real-time computation, eliminates the phase estimation error caused by the FFT picket fence effect, and improves the DQPSK decision performance of multi-carrier signals.

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Abstract

This invention provides a frequency domain reception method and apparatus for multi-carrier signals, relating to the field of signal processing technology. The method includes: for each time-domain data frame extracted from the multi-carrier signal, windowing the time-domain data frame; multiplying a pre-calculated and cached pseudo-inverse matrix with the windowed time-domain data frame to obtain the complex amplitude estimate of each subcarrier in the frequency domain corresponding to the time-domain data frame; the pseudo-inverse matrix is ​​the least-squares pseudo-inverse matrix of the window-weighted matrix, which is determined based on the complex exponential basis matrix corresponding to each known subcarrier frequency. This invention pre-calculates and caches the least-squares pseudo-inverse matrix once during system initialization, thus requiring only one matrix-vector multiplication operation during each frame processing to achieve robust estimation of the subcarrier complex amplitude, significantly reducing real-time computation and eliminating phase estimation errors caused by the FFT picket fence effect.
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