Smart Antenna Channel Calibration via Parallel Grouping
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Solution Overview
Problem
Existing antenna calibration methods for smart antennas in TDD systems are inefficient and time-consuming, especially when calibrating multiple antennas, impacting the performance of TDD services.
Innovation Solution
A method and system for calibrating downlink and uplink channels of smart antennas by allocating time-domain calibration sequences, performing real-time data collection, coupling processing, and converting to frequency-domain sequences for online calibration, with the option to group channels for efficient transmission and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single antenna transmission and reception are adopted for antenna correction in TDD system, then calibration can be performed on control channels or data channels, but calibration time is long and efficiency is low when number of antennas is large
Solution Approach 1:
The patent divides the calibration process into multiple parallel segments by grouping antennas into multiple groups. Each group undergoes calibration simultaneously through parallel processing of calibration sequences, transforming a sequential single-antenna calibration approach into a multi-group parallel calibration system, thereby reducing total calibration time while maintaining precision
Solution Approach 2:
The patent implements continuous calibration by utilizing downlink GAP periods for calibration activities without interrupting normal service operations. Calibration sequences are transmitted and processed continuously during these GAP periods, ensuring that the calibration process runs continuously alongside service traffic, thus reducing overall calibration time loss
2Reliability
If repeated transmission and reception are performed for interference elimination on control channels or data channels, then calibration can be achieved, but it produces impact on TDD services and reduces efficiency
Solution Approach 1:
The patent extracts the calibration function from the normal service channels (control channels or data channels) and implements it through dedicated calibration sequences transmitted during downlink GAP periods. This separation allows calibration to be performed independently without interfering with service traffic, thus maintaining service efficiency while ensuring calibration reliability
Solution Approach 2:
The patent introduces calibration sequences as intermediary signals that facilitate the calibration process during downlink GAP periods. These calibration sequences act as mediators between the calibration system and the antenna channels, enabling accurate calibration measurements without requiring repeated transmission and reception on service channels, thereby avoiding service impact
Data Source
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AI summary
The present invention discloses a method and a system for calibrating downlink channels of smart antennas. The method includes: allocating downlink time-domain calibration sequences for to-be-calibrated downlink channels; acquiring a plurality of downlink time-domain calibration sequences in each subsequent downlink GAP, and transmitting to the corresponding downlink channels until all the downlink time-domain calibration sequences are transmitted; collecting the downlink time-domain calibration sequence passing through the downlink channel for each downlink GAP, performing coupling processing on to form downlink comprehensive time-domain calibration sequences, and then transmitting to downlink calibration channels; caching the downlink comprehensive time-domain calibration sequences passing through the downlink calibration channels after performing time-frequency conversion; calculating compensation values of the to-be-calibrated downlink channels; and performing online calibration on the to-be-calibrated downlink channels according to the compensation values. The present invention also discloses a method and a system for calibrating uplink channels of the smart antennas.