A comprehensive least squares calibration method for sideband separation receivers

Yunsheng Liu; Chunyue Cheng

doi:10.1117/12.3046433

13 December 2024 A comprehensive least squares calibration method for sideband separation receivers

Yunsheng Liu, Chunyue Cheng

Proceedings Volume 13495, AOPC 2024: Terahertz Technology and Applications; 134950D (2024) https://doi.org/10.1117/12.3046433
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

This paper presents a novel comprehensive least squares calibration method based on digital sideband separation receivers. Addressing the issue encountered in existing traditional calibration methods, which necessitate measurements of both amplitude and phase at intermediate frequencies (IF), the proposed comprehensive least squares calibration method requires only the measurement of the amplitude and phase of the digital backend output for calibration. During digital signal processing of analog IF sampled outputs at the digital backend, a calibration coefficient matrix generated by the algorithm is introduced, and the amplitude and phase of the digital backend output signals are recorded. Amplitude and phase imbalances are solved using the least squares method, while the condition number of the calibration coefficient matrix is employed to determine whether preconditioning of ill-conditioned matrices is necessary. This process yields the amplitude and phase imbalances of the In-phase (I) and Quadrature-phase (Q) channels, which are utilized to compute compensation coefficients for calibration. Through MATLAB simulation, the feasibility of the comprehensive least squares algorithm is verified. Results demonstrate that sideband rejection ratios (SRR) of over 50 dB are achieved when amplitude imbalances range from -2.21 dB to 3.62 dB and phase imbalances range from 5° to 70°. This approach provides a promising pathway to enhance the operational performance of digital sideband separation receivers in practical applications.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yunsheng Liu and Chunyue Cheng "A comprehensive least squares calibration method for sideband separation receivers", Proc. SPIE 13495, AOPC 2024: Terahertz Technology and Applications, 134950D (13 December 2024); https://doi.org/10.1117/12.3046433

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KEYWORDS

Calibration

Matrices

Receivers

Condition numbers

Computer simulations

Analog to digital converters

MATLAB

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