Wireless Calibration Apparatus Isolating Antenna Receiver Connections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Interference from external environments degrades the spatial multiplexing performance in Active Antenna Systems (AAS) during Uplink calibration and channel estimation, leading to errors in amplitude and phase compensation.
Innovation Solution
A wireless communication apparatus with a control unit that releases connections between antennas and receivers during Uplink calibration, determines calibration weights based on received signals, and updates these weights to mitigate interference effects, ensuring accurate amplitude and phase compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station executes UL calibration and UL channel estimation with antennas connected to receivers, then the calibration and channel estimation can be performed using actual antenna signals, but external interference waves are received causing errors in amplitude and phase compensation which degrades spatial multiplexing performance
Solution Approach 1:
The patent extracts the harmful external interference from the calibration process by releasing the connection between antennas and receivers during UL calibration. This isolates the calibration signal path from external interference sources, allowing accurate amplitude and phase measurement without contamination from environmental interference waves.
Solution Approach 2:
The patent segments the calibration process into two distinct phases: (1) a calibration phase where antennas are disconnected from receivers to eliminate interference, and (2) a normal operation phase where antennas are connected to receivers for spatial multiplexing. This temporal segmentation allows each phase to optimize for its specific function without compromise.
2Measurement precision
If the connection between antennas and receivers is released during UL calibration, then external interference is eliminated improving calibration accuracy, but the calibration process becomes more complex requiring additional connection management
Solution Approach 1:
The patent implements dynamic connection management where the antenna-receiver connection state changes based on the operational phase. During UL calibration, connections are released; during normal operation, connections are established. This dynamic switching is controlled by the control unit which automatically manages the connection state transitions, making the complexity transparent to the user.
3Stability of the object's composition
If calibration is performed periodically to compensate for temperature fluctuations and aging effects, then long-term performance stability is improved, but the frequency of calibration operations increases system overhead
Solution Approach 1:
The patent implements periodic UL calibration operations to compensate for long-term drift caused by temperature fluctuations and component aging. The control unit schedules calibration at appropriate intervals, automatically releasing antenna connections during each calibration cycle and resuming normal operation afterward, balancing stability maintenance with minimal time overhead.
Data Source
AI summary
A wireless communication apparatus includes: a plurality of receivers provided so as to correspond to a plurality of respective antennas; a calibration transmitter; and a control unit configured to release, when a UL calibration is executed, connection between the antennas and the respective receivers, and determine a calibration weight to be applied to each of the receivers based on a UL calibration signal transmitted from the calibration transmitter and a UL calibration signal received by each of the receivers.