Digital TV Channel Interference Detection via Emission Masks
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Solution Overview
Problem
Digital terrestrial television systems face interference issues due to finite RF spectrum allocation, leading to emissions outside allocated channels, which can cause interference between channels.
Innovation Solution
A method and apparatus for monitoring channel power and spectral characteristics of target channels and adjacent channels, detecting interference based on delta measurements or emission masks, and presenting alarms to manage and mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple channels are allocated in the finite RF spectrum, then channel diversity and service capacity are improved, but channel interference and signal quality deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the monitoring device continuously measures spectral characteristics of adjacent channels and provides this information back to the emission monitoring system. This feedback loop enables real-time detection of emissions exceeding mask limits, allowing the system to identify and manage interference sources, thereby maintaining channel diversity while controlling interference through informed resource allocation decisions
Solution Approach 2:
The emission monitoring device acts as an intermediary between transmitting devices and the RF spectrum environment. It measures and analyzes spectral characteristics, generating emission masks that serve as intermediate control parameters. These masks mediate the interaction between adjacent channels by defining acceptable emission boundaries, thus enabling multiple channels to coexist with reduced interference
2Reliability
If emission monitoring and interference detection are implemented, then channel signal quality is improved, but system complexity and measurement requirements increase
Solution Approach 1:
The patent segments the monitoring function into distinct components: a monitoring device that measures spectral characteristics, an emission mask generation module that processes measurements, and an interference detection module that compares emissions against masks. This segmentation allows each component to perform a specific function with simplified logic, reducing overall system complexity while maintaining reliable signal quality through coordinated operation of specialized modules
Solution Approach 2:
The system performs preliminary action by pre-calculating and storing emission masks based on measured spectral characteristics before actual interference detection occurs. These pre-computed masks serve as reference standards that simplify real-time monitoring, as the system only needs to compare current emissions against predetermined thresholds rather than performing complex real-time analysis, thus reducing operational complexity while ensuring signal quality
Data Source
AI summary
A system that incorporates teachings of the present disclosure may include, for example, a server having a controller to monitor spectral characteristics of a target channel, a first channel and a second channel, where the target channel is of a digital terrestrial television system, where the first channel is an upper adjacent channel to the target channel, and where the second channel is a lower adjacent channel to the target channel. The controller is adapted to generate an emission mask based on the monitored spectral characteristics and detect interference between the target channel and at least one of the first and second channels based at least in part on the emission mask. Other embodiments are disclosed.