Layered Signal Multiplexing for Robust Multi-Power Broadcast Reception
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Solution Overview
Problem
Current multiplexing technologies like TDM and FDM lack the flexibility and performance required for next-generation broadcasting systems, necessitating a new approach for efficiently multiplexing and demultiplexing signals across multiple layers at different power levels.
Innovation Solution
A broadcast signal transmission/reception system that combines core layer and enhanced layer signals at different power levels using Bit-Interleaved Coded Modulation (BICM) and OFDM, with a signal multiplexer and demultiplexer that perform interleaving and power adjustments to manage burst errors and ensure robust reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDM or FDM is used for signal multiplexing, then signal transmission is achieved, but flexibility and performance are insufficient for next-generation broadcasting systems
Solution Approach 1:
The invention segments the signal transmission into multiple layers (base layer and enhancement layer) with different power levels. The base layer carries essential service data with robust error correction, while the enhancement layer provides additional data with higher efficiency. This segmentation allows the system to adapt to different reception conditions and service requirements, providing both flexibility and reliable performance.
Solution Approach 2:
The invention changes key transmission parameters including power allocation (different power levels for different layers), modulation order (variable depending on layer and conditions), and code rate (adjustable for each layer). These parameter changes enable the system to optimize performance for next-generation broadcasting while maintaining adaptability to various channel conditions and service types.
2Productivity
If signals are multiplexed using traditional methods, then transmission is possible, but efficiency and performance for multi-layer signals are insufficient
Solution Approach 1:
The invention merges multiple signals (base layer and enhancement layer) into a single transmitted signal stream. The base layer signal and enhancement layer signal are combined through power-controlled modulation, creating a unified multiplexed signal that maintains the robustness of the base layer while improving overall multiplexing efficiency through the enhancement layer.
Solution Approach 2:
The invention creates a composite signal structure combining two distinct signal components (base layer and enhancement layer) with different characteristics. The base layer provides robust error correction capability, while the enhancement layer provides high-efficiency data transmission. This composite signal structure achieves both reliability and productivity simultaneously.
3Productivity
If high-order modulation is used to improve bandwidth efficiency, then data rate increases, but error correction complexity increases
Solution Approach 1:
The invention segments the data stream into base layer and enhancement layer, applying different error correction strategies to each. The base layer uses robust error correction codes suitable for reliable transmission, while the enhancement layer can use more efficient but less robust codes. This segmentation reduces overall system complexity by allowing optimized error correction for each layer rather than requiring complex error correction for the entire high-rate stream.
Solution Approach 2:
The invention changes the code rate parameter differently for different layers. The base layer uses a lower code rate for robust error correction, while the enhancement layer uses a higher code rate for improved bandwidth efficiency. This parameter differentiation allows the system to achieve high overall data rates without requiring uniformly complex error correction across all data.
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AI summary
An apparatus and method for multiplexing signals using layered division multiplexing are disclosed. A signal multiplexing apparatus according to an embodiment of the present invention includes a combiner configured to combine a core layer signal and an enhanced layer signal at different power levels, and a time interleaver configured to perform interleaving applied to both the core layer signal and the enhanced layer signal.