A novel IQ mismatch compensation method in wideband direct-conversion receivers

Area of Science:

• Electrical Engineering
• Signal Processing
• Telecommunications

Background:

• Direct-conversion receivers (DCRs) are prevalent due to their compact size and low power usage.
• In-phase (I) and quadrature (Q) branch mismatch significantly degrades DCR performance.
• Existing compensation methods often require prior information, training sequences, or additional hardware.

Purpose of the Study:

• To propose a novel blind compensation method for mitigating IQ mismatch interference in DCRs.
• To develop a technique that operates without prior information, training sequences, or extra hardware.
• To offer a computationally efficient solution for IQ mismatch compensation.

Main Methods:

• Utilizing the Weaver architecture to generate an orthogonal signal from the I-channel signal via Hilbert transform.
• Implementing a blind compensation strategy that does not rely on iterative processes.
• Leveraging signal processing techniques for interference suppression.

Main Results:

• The proposed blind compensation method demonstrates excellent performance in suppressing IQ mismatch interference.
• The method proves particularly effective in wideband DCR applications.
• Simulation results validate the efficacy and efficiency of the compensation technique.

Conclusions:

• The novel blind compensation method effectively addresses IQ mismatch in DCRs.
• The proposed technique offers a low-complexity and hardware-efficient solution.
• This approach is suitable for enhancing the performance of DCRs, especially in wideband scenarios.