TS Packet Grooming for DVB-H Reception Quality
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Solution Overview
Problem
In digital video broadcasting systems, particularly DVB-H, there is a need to improve the quality of demodulated data packets due to challenging reception conditions faced by handheld devices, such as multipath fading and Doppler effects, which affect the reliability of transport stream packets.
Innovation Solution
A method and apparatus for grooming transport stream packets using crosschecking techniques, including a packet processor that corrects sync patterns, PID, CC, adaptation field, and other critical fields to produce error-free IP datagrams, enhancing MPE-FEC processing and reducing errors in DVB-H receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport stream packets are transmitted in DVB-H systems, then data can be delivered to handheld devices, but reception quality deteriorates due to multipath fading and Doppler effects
Solution Approach 1:
The patent applies preliminary action by performing crosschecking of critical fields (sync patterns, PID, CC, adaptation field) before the packets are fully processed. This advance verification allows the system to identify and correct potential errors before they propagate through the decoding process, thereby improving reception quality in challenging wireless conditions.
Solution Approach 2:
The patent implements feedback mechanisms through crosschecking and verification processes that monitor the integrity of transport stream packets. By continuously checking critical fields and comparing against expected values, the system provides feedback that enables real-time error detection and correction, enhancing reliability despite multipath fading and Doppler effects.
2Reliability
If crosschecking techniques are applied to correct critical fields, then packet error rate decreases, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the packet processing into distinct stages: sync pattern verification, PID field checking, CC field validation, and adaptation field crosschecking. Each stage handles a specific aspect of packet integrity, allowing the system to achieve comprehensive error detection through multiple focused checks rather than a single complex verification process.
Solution Approach 2:
The patent implements partial action by focusing crosschecking efforts only on critical fields (sync patterns, PID, CC, adaptation field) rather than verifying every byte of each packet. This selective approach achieves significant error detection with reduced processing overhead compared to exhaustive verification of all packet contents.
Data Source
AI summary
Received data packets are groomed to improve performance of MPEG-2 transport stream packet in a digital video broadcasting system. Multitude of crosschecking techniques are applied to ensure that crucial pieces of information such as the packet identifier (PID) field, the continuity counter (CC) field, table ID, section length, IP header checksum, table and frame boundaries, application data table size are corrected if necessary.