Display Clock Frequency Control for ATSC 3.0 Pilot Interference
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Solution Overview
Problem
Display devices face issues with reception performance and pilot signal distortion due to harmonic components of the clock signal in ATSC 3.0 broadcast signals, leading to noise interference.
Innovation Solution
A display device with a control unit that adjusts the clock frequency based on error detection, using a filter to minimize harmonic overlap with pilot signals, and performs error correction to enhance reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed clock frequency is used for decoding broadcast signals, then the decoding process is simple and stable, but the harmonic component of the clock signal overlaps with the pilot signal causing distortion and noise
Solution Approach 1:
The patent implements dynamic clock frequency adjustment by detecting pilot signal distortion caused by harmonic overlap and automatically tuning the clock frequency to eliminate the overlap. This transforms the static clock frequency system into a dynamic one that adapts to different broadcast channels, resolving the contradiction between simple fixed-frequency operation and the need to avoid harmonic interference.
Solution Approach 2:
The system uses feedback from pilot signal detection to control clock frequency adjustment. By monitoring the pilot signal for signs of harmonic overlap and using this information to adjust the clock frequency accordingly, the system creates a closed-loop control mechanism that maintains optimal reception performance without requiring complex predetermined frequency planning.
2Reliability
If the clock frequency is adjusted to avoid harmonic overlap with pilot signals, then reception performance improves, but the system complexity increases due to frequency detection and adjustment mechanisms
Solution Approach 1:
The system performs self-diagnosis by detecting pilot signal distortion and self-adjusts the clock frequency to eliminate the problem. This self-service approach allows the system to maintain high reception performance without requiring external intervention or complex manual configuration, effectively managing the trade-off between performance and complexity.
Solution Approach 2:
The patent changes the clock frequency parameter dynamically based on detected pilot signal conditions. By adjusting this critical parameter in response to observed distortion, the system improves pilot signal quality while keeping the control mechanism relatively simple, as it only requires monitoring the pilot signal and adjusting one key parameter.
3Reliability
If spread spectrum technology is used to reduce harmonic interference, then reception performance in weak RF signal areas improves, but design cost and system complexity increase significantly
Solution Approach 1:
The patent replaces expensive spread spectrum technology with a simpler, more economical clock frequency adjustment mechanism. By using basic frequency detection and tuning components rather than complex spread spectrum processing, the system achieves comparable reception performance improvement at lower design cost and with reduced system complexity.
Solution Approach 2:
Instead of implementing complex spread spectrum signal processing, the patent achieves interference reduction through simple clock frequency parameter adjustment. This parameter-based solution provides an economical alternative that maintains reception performance in weak signal areas without requiring expensive additional hardware or complex processing algorithms.
Data Source
AI summary
The present disclosure relates to a method and an apparatus for operating in a wireless communication system, the method comprising the operations of: receiving configuration information related to CSI prediction; and deriving predicted CSI for a second time point later than a first time point from CSI for the first time point, based on the configuration information, wherein based on the predicted CSI satisfying an event, actual CSI for the second time point, measured from a reference signal is transmitted, and wherein based on the predicted CSI not satisfying the event, CSI reporting for the second time point is dropped.