Control Device Signal Path Isolation for Calibration Accuracy
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Solution Overview
Problem
The application of digital pre-distortion (DPD) methods in radio communication devices can affect the accuracy of transmission calibration, leading to reduced performance in beamforming and calibration accuracy.
Innovation Solution
A control device with separate input paths for distortion compensation and calibration signals, where the calibration signal for phase and amplitude deviation is input without passing through the distortion compensation unit, ensuring the transmission calibration signal is not affected by non-linear distortion compensation processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion (DPD) processing is applied to transmission baseband signals, then non-linear distortion compensation is achieved, but transmission calibration accuracy deteriorates
Solution Approach 1:
The patent divides the signal processing path into two separate segments: one path for normal transmission signals that undergoes DPD processing, and another path for calibration signals that bypasses DPD processing. This segmentation allows the system to maintain both non-linear distortion compensation for regular signals and high-accuracy calibration without mutual interference.
Solution Approach 2:
The calibration signal path is extracted and separated from the main transmission signal path. By taking out the calibration function and providing it with a dedicated path that excludes DPD processing, the patent ensures that calibration measurements are not affected by the non-linear distortion compensation algorithms, thereby maintaining calibration accuracy.
2Device complexity
If calibration signal passes through distortion compensation unit, then signal processing is unified, but calibration accuracy decreases due to DPD processing effects
Solution Approach 1:
The system dynamically switches between different signal paths based on the type of signal being processed. Transmission signals utilize the DPD processing path for optimal non-linear compensation, while calibration signals are routed through the bypass path to maintain measurement accuracy. This dynamic path selection resolves the contradiction between unified processing and calibration accuracy.
Data Source
AI summary
A control unit (control device) (12) is configured to be connectable to radio units (11-1 to 11-N), respectively, and each path unit (13) includes path units (13-1 to 13-N) having a first input path (L1) and a second input path (L2). The first input path (L1) is a path on which a corresponding DPD unit (14) is provided and through which a transmission baseband signal compensated for the non-linear distortion is input to a corresponding radio unit (11). The second input path (L2) is a path through which a transmission calibration signal for calibrating a path and amplitude deviation between the radio units (11) is input to the corresponding radio unit (11) without passing through the DPD unit (14).