Cable Modem Transceiver Field Calibration for Transmit Power Accuracy
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Solution Overview
Problem
Current cable modem transceivers face challenges in achieving high transmit power accuracy, particularly during field deployment, as factory calibration methods are resource-intensive and may not account for real-time environmental conditions, leading to potential interference and reduced accuracy.
Innovation Solution
The cable modem transceiver incorporates a processor to derive an optimal instant for generating an upstream calibration signal based on scheduling information, allowing for field calibration of transmitter parameters such as gain and frequency, thereby reducing interference and improving accuracy without the need for factory calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory calibration is performed to achieve high transmit power accuracy, then transmit power accuracy is improved, but production time and costs increase
Solution Approach 1:
The cable modem transceiver performs self-calibration in the field by generating upstream calibration signals during non-busy time slots and measuring its own transmit power characteristics. This eliminates the need for external factory calibration equipment and processes, allowing the device to calibrate itself autonomously after deployment.
Solution Approach 2:
The system performs calibration actions in advance during initial connection to the cable network, before normal operations begin. By utilizing non-busy time slots at the beginning of operation, the calibration is completed preliminarily, avoiding interruptions to subsequent data transmission and eliminating the need for separate factory calibration steps.
2Measurement precision
If factory calibration is performed to achieve high transmit power accuracy, then transmit power accuracy is improved, but production costs increase
Solution Approach 1:
The cable modem transceiver performs self-calibration in the field by generating upstream calibration signals during non-busy time slots and measuring its own transmit power characteristics. This eliminates the need for external factory calibration equipment and processes, allowing the device to calibrate itself autonomously after deployment.
Solution Approach 2:
The calibration function is extracted from the factory manufacturing process and relocated to the field deployment phase. By removing the dependency on factory calibration equipment and processes, the manufacturing process is simplified and costs are reduced, while the calibration capability is retained through software-based self-calibration.
3Measurement precision
If traditional calibration methods are used, then calibration accuracy may be maintained, but interference with normal operations increases
Solution Approach 1:
The calibration process is performed periodically during designated non-busy time slots rather than continuously or during normal data transmission. This periodic scheduling ensures that calibration signals are transmitted only when the upstream channel is not being used for data communication, eliminating interference with normal operations.
Solution Approach 2:
The calibration function is extracted from the factory manufacturing process and relocated to the field deployment phase. By removing the dependency on factory calibration equipment and processes, the manufacturing process is simplified and costs are reduced, while the calibration capability is retained through software-based self-calibration.
Data Source
AI summary
A cable modem transceiver includes a processor configured to derive an instant of time for an upstream calibration signal on basis of upstream scheduling information. Further, the cable modem transceiver includes a transmitter configured to generate the upstream calibration signal at the derived instant of time. The cable modem transceiver additionally includes a detector configured to determine a property of the generated upstream calibration signal. The processor is further configured to derive at least one calibration parameter for the transmitter on basis of the detected property.