Interleaver Depth Signal Identification for CPE Channel Scanning
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Solution Overview
Problem
Current methods for customer premise equipment (CPE) devices to identify and lock onto downstream data signals are time-consuming, as they require analyzing packet identifiers, acquiring QAM lock, and error correction, making it inefficient to distinguish data signals from video signals during channel scanning.
Innovation Solution
The method involves identifying the interleaver depth of incoming signals, determining if it falls within a predetermined range associated with data signals, and using this information to quickly determine whether a signal is a data or video signal, allowing the CPE device to efficiently lock onto data signals by terminating the lock on non-matching signals and searching for a valid data signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CPE device analyzes packet identifiers and performs error correction to identify signals, then the signal identification accuracy is improved, but the time required for channel scanning increases
Solution Approach 1:
The patent applies preliminary action by checking the interleaver depth parameter before performing the time-consuming PID analysis and error correction processes. The interleaver depth is examined first to quickly filter out video signals, and only signals passing this preliminary check undergo the full identification process, thereby reducing overall scanning time while maintaining accuracy.
Solution Approach 2:
The patent extracts the interleaver depth parameter as a separate filtering criterion from the main signal identification process. By extracting this parameter for preliminary evaluation, the system separates the quick filtering function from the detailed analysis function, allowing efficient differentiation between data and video signals without committing to full processing of all signals.
2Reliability
If the CPE device performs full signal analysis including PID identification and error correction, then the reliability of signal differentiation is improved, but the scanning efficiency deteriorates
Solution Approach 1:
The system performs preliminary action by evaluating the interleaver depth parameter before initiating comprehensive signal analysis. This preliminary check reliably filters out video signals that have interleaver depths outside the expected range for data signals, ensuring that only promising candidates undergo full PID and error correction analysis, thus maintaining differentiation reliability while improving scanning efficiency.
Solution Approach 2:
The interleaver depth parameter serves as an intermediary filtering mechanism between the signal reception stage and the detailed analysis stage. It acts as a mediator that quickly eliminates unlikely candidates (video signals) before the more resource-intensive PID identification and error correction processes, thereby improving overall scanning efficiency without compromising the reliability of final signal differentiation.
Data Source
AI summary
Methods, systems, and computer readable media can be operable to distinguish between data signals and video signals based upon interleaver depths associated with the signals. A CPE device can identify an interleaver depth associated with a signal and can make the determination that the signal is a video signal when the interleaver depth is outside of a predetermined range, the predetermined range being based on interleaver depths that are expected for a data signal.