Channel Simulator Path Loss Calibration via Segmentation
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Solution Overview
Problem
Current channel simulators require significant time and effort for path loss calibration across multiple base stations and terminals, leading to inefficiencies and potential errors due to the complexity of calibrating P×Q paths, especially when connections are released or measurements are not exact.
Innovation Solution
A calibration method that simplifies the process by dividing path loss into ADC and DAC components, allowing for the calculation of calibration matrices as P×1 and Q×1 vectors, reducing the complexity to P+Q paths and enabling rapid calibration by adjusting amplifier gains and attenuator settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If path loss calibration is performed for all P×Q paths in a large-capacity channel simulator, then calibration accuracy is improved, but calibration time and complexity increase significantly
Solution Approach 1:
The patent segments the P×Q path loss calibration problem into two independent parts: (1) calibration of P base station paths, and (2) calibration of Q terminal paths. By dividing the calibration into separate base station-side and terminal-side operations, the total calibration complexity is reduced from O(P×Q) to O(P+Q), significantly reducing calibration time while maintaining accuracy through the relationship: measured_path_loss = base_station_calibration + terminal_calibration
Solution Approach 2:
The patent introduces an intermediary reference signal mechanism where a known reference signal is transmitted through each path and measured at the opposite end. This intermediary reference signal serves as a mediator to establish the calibration relationship between base stations and terminals without requiring direct calibration of all P×Q path combinations, enabling efficient two-sided calibration
2Reliability
If conventional calibration methods are used for large-capacity simulators, then calibration completeness is improved, but operational complexity increases
Solution Approach 1:
The calibration operation is segmented into independent base station calibration and terminal calibration procedures. Each base station is calibrated separately against reference terminals, and each terminal is calibrated separately against reference base stations. This segmentation transforms a complex P×Q matrix calibration operation into simpler P+Q independent calibration operations, significantly improving ease of operation while maintaining completeness
Solution Approach 2:
The system enables self-service calibration where base stations and terminals automatically perform calibration measurements using embedded reference signals and processing logic. The calibration procedure is automated through the channel simulator's control unit, which automatically transmits reference signals, collects measurements, calculates calibration values, and applies corrections without requiring manual intervention for each path, thereby simplifying operation while ensuring complete calibration
Data Source
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AI summary
A calibration method for a channel simulator is applied to a large-capacity channel simulator having the interfaces of P base stations and Q terminals so that path loss calibration for P×Q paths is more rapidly and easily performed.