Layered Signal Multiplexing for Multi-Power Broadcast Transmission
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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 signal power levels effectively.
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 patent segments the signal transmission into multiple layers (base layer and enhancement layer) with different power levels, allowing independent processing and transmission of each layer. This segmentation enables flexible adaptation to different service requirements while maintaining reliable transmission through hierarchical structure
Solution Approach 2:
The patent introduces a new dimension of power level differentiation for signal multiplexing, moving beyond traditional time or frequency division. By combining TDM/FDM with power level differentiation, the system achieves enhanced flexibility and performance simultaneously
2Productivity
If signals are multiplexed using traditional methods, then transmission is possible, but efficiency in handling multiple layers at different power levels is poor
Solution Approach 1:
The patent applies preliminary actions by performing error correction coding and interleaving separately for each layer before multiplexing. This pre-processing simplifies the overall multiplexing operation and improves efficiency by handling each layer independently according to its specific requirements
Solution Approach 2:
The patent applies local quality by using different error correction codes, code rates, and interleaving parameters for different layers based on their specific requirements. The base layer uses more robust parameters while the enhancement layer uses less robust but more efficient parameters
Data Source
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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 to generate a multiplexed signal, a power normalizer configured to reduce power of the multiplexed signal to power corresponding to the core layer signal, and a time interleaver configured to perform interleaving applied to both the core layer signal and the enhanced layer signal.