Distributed Antenna Node Unit Spurious Wave Control
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Solution Overview
Problem
In distributed antenna systems, spurious waves can be generated due to power interruptions or resets, damaging signal processing components and degrading service quality, as they can be transmitted to adjacent nodes.
Innovation Solution
A node unit with a power supply unit, a digital part for processing relay signals, and a controller that disables the digital part's output in response to control commands for power or digital resets, preventing spurious waves by managing the output of the digital and node termination units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power is supplied to the node unit, then the digital elements can operate and process signals, but spurious waves may be generated from the digital elements during power supply or reset operations
Solution Approach 1:
The patent applies preliminary anti-action by detecting power supply status changes (such as power on, power off, or reset conditions) before spurious waves can be generated, and preemptively controlling the output buffer to prevent spurious wave generation. The controller monitors power supply voltage levels and detects when the digital element is in an uninitialized state, then disables the output buffer in advance to block potential spurious waves before they can be transmitted to adjacent node units.
Solution Approach 2:
The patent implements preliminary action by initializing the output buffer to a predetermined state (such as high impedance or zero level) before the digital element completes its initialization process. The controller detects when power is supplied to the node unit and sets the output buffer to a safe state before the digital element finishes its startup sequence, ensuring that even if spurious waves are generated during initialization, they will not be transmitted through the output buffer.
2Reliability
If the output of the digital part is disabled during reset operations, then spurious waves are prevented, but normal signal processing is interrupted during the reset period
Solution Approach 1:
The patent maintains continuity of useful action by quickly transitioning the output buffer between enabled and disabled states based on power supply status. The controller continuously monitors power supply voltage and rapidly switches the output buffer state to match the operational status of the digital element, minimizing the time the output buffer remains in a non-operational state while ensuring spurious waves are never transmitted.
Solution Approach 2:
The patent implements feedback by having the controller continuously monitor the power supply voltage level and the operational status of the digital element, then adjusting the output buffer state accordingly. When the power supply voltage indicates that the digital element is uninitialized or being reset, the controller disables the output buffer. Once the digital element is fully initialized and operational, the controller enables the output buffer again, creating a closed-loop control system that automatically manages spurious wave prevention.
Data Source
AI summary
A node unit of a distributed antenna system includes a power supply unit for supplying power for operating the node unit, a digital part operated by the power supplied from the power supply unit, the digital part performing digital processing on input relay signals and outputting the digital-processed relay signals, and a controller for disabling an output of the digital part in response to a first control command for instructing a reset of the power supply unit or a second control command for instructing a reset of the digital part.