Fast Antenna Array Calibration Using One External Receiver

Area of Science:

• Signal Processing
• Array Signal Processing
• Electromagnetics

Background:

• Mutual coupling degrades beampattern design quality in array communication and radar systems.
• Accurate calibration of mutual coupling is crucial for optimal system performance.

Purpose of the Study:

• To develop a matrix-inversion-free algorithm for mutual coupling calibration in transmit arrays.
• To reduce computational complexity and enable application in large array systems like massive MIMO.

Main Methods:

• A novel algorithm utilizing Fast Fourier Transform (FFT) for simplified matrix calculations.
• Requires only a single antenna receiver, reducing hardware complexity.
• Incorporates a constant modulus training sequence for high-power active radar calibration.

Main Results:

• Achieves excellent performance with significantly reduced computational complexity compared to existing methods.
• Demonstrated effectiveness in various scenarios through comparison with ground truth.
• Enables precise measurement and compensation of mutual coupling effects.

Conclusions:

• The proposed algorithm offers an accelerated and efficient solution for mutual coupling calibration.
• Applicable to large-scale systems such as massive multiple-input-single-output (MISO) and active radar.
• Improves signal quality and system performance in radar and mobile communication applications.