OFDM Broadcast Frame Parsing for Robust Multi-PLP Reception
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Solution Overview
Problem
Current digital broadcast signal transmission technologies face challenges in data transmission efficiency, robustness, and network flexibility, especially for mobile reception and indoor environments, due to the large amounts of video/audio data and additional services they need to handle.
Innovation Solution
A broadcast signal receiver and transmitter apparatus utilizing Orthogonal Frequency Division Multiplexing (OFDM) with a Fast Fourier Transform (FFT) module, pilot detection, frame parsing, Physical Layer Pipe (PLP) data demapping, and Forward Error Correction (FEC) decoding, along with an output processing module to enhance data transmission efficiency and robustness, and support various broadcast services through Multiple Input Multiple Output (MIMO) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital broadcast signal transmission is implemented to provide HD images and multi-channel audio, then service quality is improved, but data transmission efficiency deteriorates due to large amounts of data
Solution Approach 1:
The broadcast signal is divided into multiple Physical Layer Pipes (PLPs), each carrying different types of data (video, audio, additional services). This segmentation allows independent optimization of transmission parameters for different data types, improving overall transmission efficiency while maintaining high service quality
Solution Approach 2:
The system dynamically adjusts transmission parameters including modulation schemes (QPSK, 16-QAM, 64-QAM), coding rates, and guard interval lengths based on channel conditions and service requirements. This enables efficient adaptation to varying data demands while maintaining reliability
2Reliability
If robust transmission is implemented for mobile reception and indoor environments, then reception reliability is improved, but network flexibility deteriorates
Solution Approach 1:
The system employs dynamic parameter adjustment where transmission parameters such as modulation order, coding rate, and guard interval length are adaptively changed based on detected channel conditions. This allows the system to maintain robust reception in mobile and indoor environments while preserving network flexibility through configurable parameter sets
Solution Approach 2:
The broadcast system is designed with universal PLP structures that can carry different service types (HD video, SD video, audio, data services) using the same transmission framework. Multiple parameter configurations are supported within a single system, enabling both robustness for challenging reception conditions and flexibility for diverse service requirements
3Adaptability or versatility
If large amounts of video/audio data and additional services are transmitted, then service diversity is improved, but transmission robustness deteriorates
Solution Approach 1:
Different service types (video, audio, additional data services) are segmented into separate PLPs with independently optimized coding and modulation parameters. Critical services can use more robust parameters while less critical services use more efficient parameters, maintaining overall transmission robustness while supporting diverse services
Solution Approach 2:
Each PLP can have locally optimized transmission parameters tailored to its specific service requirements. For example, video data may use higher coding rates with stronger error correction, while additional data services may use different parameters, allowing service diversity without compromising overall robustness
Data Source
AI summary
A device for processing a broadcast signal, includes a tuner configured to receive the broadcast signal carrying a bootstrap prefixed to the beginning of a signal frame, the bootstrap including one or more bootstrap symbols, a last bootstrap symbol immediately followed by a preamble of the signal frame including bootstrap termination information, the bootstrap including first information for representing a structure of the preamble; a demodulator configured to demodulate the broadcast signal; a de-framer configured to de-frame the signal frame in the broadcast signal to output the preamble and PLP data, the preamble carrying Layer 1 (L1) signaling data for the signal frame; a signaling decoder configured to decode the L1 signaling data; and a decoder to decode the PLP data based on the L1 signaling data.