DTV Receiver Equalization Using Segmented Known Data Sequences
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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 with portable and mobile receivers, which exacerbates the reception of mobile service data.
Innovation Solution
A digital broadcasting system that processes and transmits digital broadcast signals by inserting known data into the conventional mobile service data area, forming continuous known data sequences, and performing carrier recovery and channel equalization using segmented and long known data sequences to enhance reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VSB transmission mode is used for digital broadcasting, then compatibility with conventional systems is maintained, but receiving performance deteriorates in poor channel environments especially for mobile services
Solution Approach 1:
The patent segments known data into multiple groups and distributes them across different data groups in the broadcast signal. This segmentation allows the receiver to reconstruct continuous known data sequences from scattered segments, enabling effective carrier recovery and channel equalization without changing the overall VSB transmission structure, thus maintaining compatibility while improving mobile reception performance
Solution Approach 2:
The patent introduces known data as an intermediary element between the transmitter and receiver. These known data sequences serve as reference signals that facilitate carrier frequency offset estimation and channel equalization, acting as a mediator that enables the receiver to compensate for channel impairments without requiring changes to the VSB modulation scheme itself
2Area of stationary object
If mobile service data is transmitted using VSB mode, then service coverage is maintained, but resistance to channel changes and noise is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-inserting known data sequences into the broadcast signal at the transmitter before transmission. These pre-placed reference signals enable the receiver to perform carrier recovery and channel equalization operations, proactively compensating for channel impairments before they severely degrade the mobile service data reception
3Quantity of substance
If additional mobile service data is inserted into conventional system, then data capacity increases, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a data group structure that serves multiple functions: it carries mobile service data, embeds known data for carrier recovery, and maintains compatibility with conventional receivers. The same data group format can be used by both conventional and enhanced receivers, allowing the system to increase data capacity without creating incompatible complexity
Data Source
AI summary
A transmitting system, a receiving system, and a method of processing broadcast signals are disclosed. The method for processing a broadcast signal in a broadcast receiver comprises receiving a DTV signal including a data group, the data group including mobile service data, segmented known data sequences, long known data sequences and transmission parameter data, compensating carrier frequency offset of the DTV signal and channel-equalizing the carrier frequency offset compensated DTV signal using at least one of the long known data sequences and segmented known data sequences in the data group of the DTV signal, wherein the channel-equalizing includes performing a Error Correction (FEC) decoding on data located between the segmented known data sequences, and estimating Channel Impulse Response (CIR) using the FEC decoded data as known data.