Base Station Antenna Port Isolation for Intermodulation
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Solution Overview
Problem
Intermodulation signals generated by downlink signals interfere with uplink signals in multi-operator radio access networks, particularly in the DD800M frequency band, leading to reduced receiver sensitivity and increased network construction costs due to the need for multiple radio frequency modules.
Innovation Solution
A base station configuration that isolates uplink and downlink channels by connecting receive and transmit ports of the radio frequency unit to different dual-polarized or single-polarized dipoles in the antenna unit, preventing intermodulation interference without requiring additional radio frequency units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single radio frequency module supports multiple carriers in DD800M frequency band, then network construction costs are reduced, but intermodulation signals generated on downlink interfere with uplink signals
Solution Approach 1:
The patent segments the antenna elements into multiple independent dipole antennas, each handling specific carriers. By dividing the antenna system into separate dipoles for different carriers, the patent enables frequency isolation that prevents intermodulation interference while maintaining cost-effective single radio frequency module architecture.
Solution Approach 2:
The patent introduces an intermediary switching mechanism that dynamically connects different antenna dipoles to the radio frequency module based on which carrier is currently transmitting. This intermediary switching system allows the single radio frequency module to serve multiple carriers without causing intermodulation interference, as only one carrier is active at a time.
2Reliability
If dual radio frequency modules are configured to avoid intermodulation interference, then receiver sensitivity is improved, but device complexity and project costs increase
Solution Approach 1:
The patent employs dynamic switching between different antenna dipoles based on the active carrier. The switching mechanism dynamically reconfigures the antenna connections to match the current transmission carrier, allowing a single radio frequency module to adaptively serve multiple carriers without interference, thereby avoiding the need for multiple static radio frequency modules.
Solution Approach 2:
The patent implements periodic time-division multiplexing where different carriers are transmitted at different time intervals. The switching mechanism periodically connects different antenna dipoles to the radio frequency module according to the periodic activation of different carriers, ensuring that intermodulation interference is avoided while maintaining continuous service.
Data Source
AI summary
Embodiments provide a base station, including an antenna unit and a radio frequency unit. A port corresponding to a receive channel that is of the radio frequency unit and in a working state and a port corresponding to a transmit channel that is of the radio frequency unit and in the working state are separately connected to ports corresponding to different dual-polarized dipoles or different single-polarized dipoles in the antenna unit. The different dual-polarized dipoles or the different single-polarized dipoles in the antenna unit are mutually isolated.