Digital Broadcasting Signal Encoding for Mobile VSB Reception

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Solution Overview

Problem

The Vestigial Sideband (VSB) transmission mode used in digital broadcasting in North America and Korea is prone to performance deterioration in poor channel environments, especially when using portable or mobile receivers, due to insufficient resistance to channel changes and noise.

Innovation Solution

A digital broadcasting system that enhances receiving performance by performing additional encoding on mobile service data and inserting known data sequences in a predetermined area, allowing the receiving system to demodulate and channel-equalize using these sequences, thereby improving resistance to channel changes and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If VSB transmission mode is used for digital broadcasting, then the system can maintain compatibility with existing standards and infrastructure, but receiving performance deteriorates in poor channel environments and mobile scenarios

Engineering Contradiction:

Improvecompatibility with existing standardsVSAvoidreceiving performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the transmitted signal into multiple components by applying different encoding schemes to different data streams. Main service data uses conventional encoding while mobile service data receives additional encoding, creating segmented protection levels that improve overall reliability without compromising standard compatibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic adaptability by implementing receiving performance-based additional encoding. The system dynamically adjusts the encoding level for mobile service data based on channel conditions and receiver capabilities, allowing it to adapt to varying environmental requirements while maintaining standard compliance

Inventive Principle:

Principle #15Dynamics

2Reliability

If additional encoding is performed on mobile service data, then resistance to channel changes and noise improves, but system complexity increases

Engineering Contradiction:

Improveresistance to channel changes and noiseVSAvoidencoding system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by implementing additional encoding selectively only for mobile service data packets, while main service data uses standard encoding. This localized approach provides enhanced protection where needed (mobile data) without unnecessarily complicating the entire system

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial action by applying additional encoding only to the extent necessary for mobile service data reliability. The receiving system performs decoding only for mobile service data packets, implementing just enough additional processing to achieve the desired noise resistance without excessive complexity

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If known data sequences are inserted in predetermined areas, then receiving performance and channel equalization capability improve, but data transmission efficiency decreases

Engineering Contradiction:

Improvereceiving performanceVSAvoiddata transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by inserting known data sequences in advance at predetermined positions within the data stream. These sequences are prepared beforehand to enable the receiving system to perform channel equalization and synchronization operations, improving receiving performance through proactive signal preparation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The known data sequences serve as intermediary elements that facilitate the interaction between the transmitted signal and the receiving system. These sequences act as reference points that enable channel characterization and equalization, mediating the signal recovery process without being part of the actual service data

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8954829B2Digital broadcasting system and method of processing data

Publication Date: 2015.02.10 LG ELECTRONICS INC

AI summary

A broadcast transmitter and a method of processing broadcast data in the broadcast transmitter are disclosed. The method includes randomizing broadcast service data, first encoding the randomized broadcast service data to add parity data, second encoding the first-encoded broadcast service data at a code rate of D/E, first interleaving the second-encoded broadcast service data, encoding signaling data for signaling the broadcast service data, modulating the first-interleaved broadcast service data and the encoded signaling data, and transmitting the modulated data.