Layered Broadcast Signal Multiplexing with Core and Enhanced Layers
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Solution Overview
Problem
Existing multiplexing technologies such as TDM and FDM lack the flexibility and performance required for next-generation broadcasting systems.
Innovation Solution
A new signal multiplexing method that combines core layer and enhanced layer signals at different power levels, using Bit-Interleaved Coded Modulation (BICM) and Orthogonal Frequency Division Multiplexing (OFDM), to efficiently multiplex and demultiplex signals.
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 broadcast signal into multiple layers (core layer and enhanced layer) with different power levels and modulation schemes. Each layer can be independently configured and transmitted, allowing flexible adaptation to different service requirements while maintaining reliable transmission through hierarchical structure
Solution Approach 2:
The patent introduces power level as an additional dimension for signal multiplexing, beyond traditional time and frequency domains. By assigning different power levels to different layers, the system achieves greater flexibility in resource allocation and service differentiation while improving overall transmission performance
2Adaptability or versatility
If signals are multiplexed at different power levels, then flexibility and performance are improved, but signal demultiplexing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring different power levels and modulation schemes for each layer during signal generation. The receiver is预先 equipped with knowledge of the hierarchical structure, allowing it to sequentially decode layers starting from the highest power level, thereby managing complexity through structured preprocessing
3Productivity
If hierarchical modulation is used to multiplex core layer and enhanced layer signals, then data transmission rate and error correction are improved, but signal processing complexity increases
Solution Approach 1:
The patent applies local quality by assigning different modulation schemes and power levels to different layers according to their specific requirements. The core layer uses more robust modulation for reliable transmission, while the enhanced layer uses higher-order modulation for increased data rate, allowing each part of the signal to be optimized for its specific function
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.