DVB-T.2 Reception Apparatus Synchronism Correction
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Solution Overview
Problem
In the DVB-T.2 system, synchronism between Common PLP and Data PLP can be lost due to incorrect signals from the reception channel environment, requiring rapid re-establishment of synchronism for reliable data recovery.
Innovation Solution
A reception apparatus and method that utilizes time counting, detection, and correction means to compare and synchronize the Common PLP and Data PLP using additional information like ISCR and DNP, correcting any time displacement to re-establish synchronism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronism between Common PLP and Data PLP is established using conventional methods, then data can be restored, but synchronism is lost when wrong signals are received from the reception channel environment
Solution Approach 1:
The patent implements a feedback mechanism where the reception apparatus continuously monitors the synchronism state between Common PLP and Data PLP by comparing time stamps. When desynchronism is detected, the system automatically adjusts the readout timing to restore synchronism, creating a closed-loop control system that maintains reliable operation despite channel interference
Solution Approach 2:
The patent uses time stamp information embedded in packets to predict and prevent desynchronism before it occurs. By continuously comparing expected time stamps with actual received time stamps, the system can detect potential synchronization issues early and adjust timing proactively, rather than waiting for complete data loss
2Reliability
If conventional synchronism re-establishment methods are used after synchronism loss, then synchronism can be restored, but the process takes too much time and reduces productivity
Solution Approach 1:
The patent maintains continuous time stamp comparison and timing information even during normal operation, so when desynchronism occurs, the system already has the necessary timing data to immediately calculate and apply the required adjustment. This preliminary preparation of timing information enables instant re-synchronization without time-consuming measurement phases
Solution Approach 2:
The reception apparatus autonomously detects desynchronism conditions and automatically adjusts its own readout timing without requiring external intervention or complex re-initialization sequences. The system uses its existing time stamp comparison mechanism to self-correct the synchronization state, minimizing interruption to data recovery operations
3Measurement precision
If time counting and detection means are added to detect time displacement, then synchronism can be monitored, but device complexity increases
Solution Approach 1:
The patent integrates the time stamp comparison and time displacement detection functions into the existing synchronism maintenance infrastructure of the reception apparatus. The same timing mechanisms that are already present for basic operation are utilized for detection purposes, eliminating the need for separate dedicated detection hardware and reducing overall system complexity
Solution Approach 2:
The reception apparatus uses its existing time stamp information and timing mechanisms to perform self-diagnosis of synchronization status. By comparing time stamps that are already embedded in the received data packets, the system generates its own timing measurements without requiring external measurement equipment, thereby avoiding additional device complexity
Data Source
AI summary
Disclosed herein is a reception apparatus, including: a reception section configured to receive an OFDM (Orthogonal Frequency Division Multiplexed) signal obtained by modulating a common packet sequence configured from a packet common to streams and a data packet sequence configured from packets individually unique to the streams; a time counting section configured to count, using predetermined time indicated by additional information added to particular packets of the common and data packet sequences obtained by demodulating the received OFDM signal as a reference, elapsed time after the predetermined time; a detection section configured to compare the counted time and time indicated by the additional information added to the particular packets of the common and data packet sequences to detect a displacement in the time direction between the packets; and a correction section configured to correct the displacement between the packets of the common and data packet sequences in the time direction.