Layered Division Multiplexing for Power-Normalized Broadcast Signals
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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, particularly in efficiently combining and separating signals at different power levels.
Innovation Solution
A signal multiplexing apparatus and method that combines core and enhanced layer signals at different power levels, using Bit-Interleaved Coded Modulation (BICM) units and power normalization, along with time interleaving, to generate and demultiplex signals efficiently.
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 into multiple layers (core layer and enhanced layer) with different power levels, allowing independent processing and transmission of each layer. This segmentation enables flexible adaptation to different channel conditions while maintaining reliable transmission through the core layer, resolving the contradiction between flexibility and performance.
Solution Approach 2:
The patent changes the power parameter of different signal layers, transmitting the core layer at a higher power level and the enhanced layer at a lower power level. This parameter change allows the system to maintain flexibility in power allocation while ensuring the core layer achieves reliable transmission even in poor channel conditions.
2Productivity
If signals are combined at different power levels, then multiplexing efficiency is improved, but power adjustment complexity increases
Solution Approach 1:
The patent applies preliminary power adjustment to the enhanced layer signal before combining it with the core layer signal. By pre-scaling the enhanced layer power to a lower level, the combiner can efficiently combine signals at different power levels without requiring complex real-time power adjustment mechanisms, thus improving multiplexing efficiency while controlling device complexity.
3Adaptability or versatility
If core layer and enhanced layer signals are combined, then signal flexibility is improved, but power normalization becomes necessary
Solution Approach 1:
The patent changes the power parameter of the enhanced layer signal by applying a scaling factor before combination. This parameter change ensures that the enhanced layer does not overpower the core layer, maintaining signal flexibility while simplifying the power normalization process through predetermined scaling rather than complex dynamic adjustment.
Data Source
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.