Single-Cable XPIC Interconnection for Cross-Polarization Cancellation
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Solution Overview
Problem
Conventional radio communication systems require multiple cables for cross polarization interference cancellation, leading to increased complexity and potential performance degradation due to multipath fading.
Innovation Solution
A single cable with multiple twisted-pairs of wires is used to connect two radio units, where each XPIC module generates a reference signal from the opposing unit's downconverter output to cancel cross-polarization interference, reducing the number of cables needed and maintaining system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate coaxial cables are used for transmitting polarized signals between radio units, then cross-polarization interference cancellation can be achieved, but the cable complexity and system cost increase
Solution Approach 1:
The patent combines multiple interconnection functions into a single coaxial cable by using multiple connectors. The single cable carries both the reference signal from the first polarization and the other polarization signal, eliminating the need for two separate coaxial cables. This merging approach reduces cable complexity while maintaining the ability to perform cross-polarization interference cancellation through the XPIC module.
2Reliability
If multiple interconnections are implemented between radio units, then interference cancellation signals can be transmitted, but installation and system maintenance difficulty increase
Solution Approach 1:
By merging multiple signal transmission functions into a single cable with multiple connectors, the patent reduces the number of cable installation steps and connection points. The single cable approach simplifies physical installation, routing, and maintenance compared to managing two separate coaxial cables, while still providing all necessary signal paths for interference cancellation.
Data Source
AI summary
An outdoor radio communication system comprises a first radio unit, a second radio unit, and a single cable coupling the first radio unit to the second radio unit. Each radio unit includes a downconverter, a radio processor that is communicatively coupled to the downconverter, and a XPIC module. The cable further includes a first twisted-pair of wires for communicatively coupling the first downconverter to the second XPIC module and a second twisted-pair of wires for communicatively coupling the second downconverter to the first XPIC module. The first XPIC module generates a first reference signal using a signal from the second downconverter to cancel cross-polarization interference in an output signal of the first radio processor. Similarly, the second XPIC module generates a second reference signal using a signal from the first downconverter to cancel cross-polarization interference in an output signal of the second radio processor.