Mobile Broadcast Reception Using Known Data Equalization
Find Innovative SolutionsGenerate Solutions
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, inserting known data in predetermined regions, and using a service multiplexer to multiplex mobile and main service data, along with a transmitter that groups encoded data packets and transmits them to a digital broadcast receiving system, which includes a demodulator, equalizer, and error corrector to improve signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VSB transmission mode is used for digital broadcasting, then the system is simple and compatible with existing standards, but receiving performance deteriorates in poor channel environments and mobile conditions
Solution Approach 1:
The patent applies preliminary action by inserting known data sequences (training sequences) before the actual data transmission in predetermined regions. These known sequences are prepared in advance at the transmitter and stored at the receiver, enabling the receiver to perform channel estimation and equalization before receiving the actual mobile service data, thus improving receiving performance in advance.
Solution Approach 2:
The patent uses known data sequences as an intermediary element between the transmitter and receiver. These sequences serve as a reference signal that mediates the channel estimation process, allowing the receiver to characterize the channel conditions and compensate for distortions without directly analyzing the actual data signals, thereby improving robustness against channel changes and noise.
2Reliability
If additional encoding is performed on mobile service data, then resistance to channel changes and noise improves, but device complexity increases
Solution Approach 1:
The patent applies partial action by performing additional encoding only on mobile service data packets, not on all broadcast data. The service multiplexer selectively identifies and applies additional encoding to mobile service data while leaving other data types unchanged, thus improving reliability for mobile receivers without unnecessarily increasing complexity for all data processing paths.
Solution Approach 2:
The patent segments the data processing into separate paths: mobile service data undergoes additional encoding and is placed in specific data groups with known sequences, while other data follows the conventional path. This segmentation allows the system to apply enhanced processing only where needed (mobile data) without increasing complexity for the entire broadcasting system.
3Measurement precision
If known data sequences are inserted in predetermined regions, then channel estimation and equalization performance improve, but data transmission efficiency decreases
Solution Approach 1:
The patent applies local quality by inserting known data sequences only in predetermined regions (specific time-frequency locations) rather than throughout the entire transmission. The service multiplexer places these sequences in specific data groups at strategic locations where they provide maximum benefit for channel estimation while minimizing impact on overall data throughput.
Solution Approach 2:
The patent uses partial action by inserting known sequences only in certain predetermined regions rather than in all data transmissions. This selective insertion provides sufficient channel estimation capability for mobile reception while maintaining higher data transmission efficiency compared to continuous insertion throughout all data groups.
Data Source
AI summary
A receiving system and data processing method therein are disclosed, by which mobile service data is received and processed. The present invention includes a demodulator receiving a broadcast signal including mobile service data and main service data, the demodulator converting the received broadcast signal to a baseband signal, the mobile service data configuring a data group, the data group including a plurality of know data sequences, a known data detector detecting a location of at least one of the known data sequence within the data group, the known data detector outputting detected known data location information, an equalizer channel-equalizing the demodulated mobile service data using the detected known data location information, and a signaling decoder reconstructing transmission parameter channel (TPC) data and fast information channel (FIC) data received by being included in a signaling information area allocated between a first known data sequence and a second known data sequence among a plurality of the known data sequences.