Relay Apparatus Calibration via Frequency Segmentation
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Solution Overview
Problem
Conventional calibration methods in wireless communication systems face challenges in accurately compensating for variations in phase and amplitude characteristics between circuit components, particularly in array antennas, due to interference from calibration signals and limitations in timing control, which affects signal distortion and communication quality.
Innovation Solution
The implementation of a relay apparatus that mixes a calibration signal of a different frequency band with the reception signal, allowing for estimation of phase and amplitude variations without interference, and uses weighted estimation results based on transmission power to improve accuracy, enabling effective beamforming and calibration without disrupting regular transmission and reception operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration signal is input to the transmitter and receiver for calibration, then phase and amplitude variations can be measured and compensated, but the calibration signal interferes with the transmission signal and reception signal
Solution Approach 1:
The patent segments the calibration process by separating the calibration signal frequency from the transmission/reception signal frequencies. The calibration signal is transmitted at a first frequency while reception occurs at a second frequency, allowing independent measurement without interference. This frequency segmentation enables simultaneous calibration and normal operation without mutual interference.
Solution Approach 2:
The patent introduces an intermediary frequency band for the calibration signal that acts as a mediator between the calibration function and the communication function. By using a different frequency band as an intermediary carrier for calibration purposes, the system can perform measurements without the calibration signal directly interfering with the communication signals, thus resolving the interference problem while maintaining measurement capability.
2Measurement precision
If calibration is performed to compensate for variations in array antenna elements, then beamforming accuracy improves, but timing control limitations in relay systems reduce calibration effectiveness
Solution Approach 1:
The patent implements self-service calibration where the relay apparatus autonomously performs calibration measurements using its own transmission and reception capabilities. The apparatus transmits calibration signals and measures the variations in its own circuit components and antenna elements without requiring external calibration equipment or complex timing synchronization with other devices, thus overcoming timing control limitations.
Solution Approach 2:
The patent performs calibration measurements in advance before normal communication operations to pre-determine the phase and amplitude variations. By conducting calibration beforehand and storing the measured characteristics, the system can compensate for variations without requiring real-time timing control during actual communication, thus resolving the timing flexibility issue while maintaining beamforming accuracy.
Data Source
AI summary
According to one embodiment, an electronic apparatus includes a receiver and a signal addition circuit. The receiver receives a reception signal of a first frequency band. The signal addition circuit is configured to input the reception signal and a calibration signal of a second frequency band which is different from the first frequency band to the receiver.