Layered Signal Multiplexing with Power-Level Interleaving
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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 multiplexing and demultiplexing signals across 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 a time interleaver, with an injection level controller to adjust power levels and a power normalizer to maintain signal integrity.
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 for next-generation broadcasting systems are insufficient
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 service requirements while maintaining reliable transmission through hierarchical structure.
Solution Approach 2:
The patent introduces a new dimension for signal multiplexing by combining Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM) into a hybrid approach. This dimensional combination provides greater flexibility in resource allocation and improves overall system performance for next-generation broadcasting.
2Productivity
If signals are multiplexed using traditional methods, then transmission is possible, but efficient multiplexing and demultiplexing across different power levels is not achieved
Solution Approach 1:
The patent applies preliminary actions by performing error correction coding and bit interleaving on each layer before multiplexing. This pre-processing ensures that signal quality is maintained throughout the multiplexing and demultiplexing process, preventing information loss while improving multiplexing efficiency.
Solution Approach 2:
The patent uses a hybrid TDM-FDM multiplexing scheme as an intermediary mechanism that efficiently combines signals from different power levels. This intermediary approach maintains signal integrity during transmission while enabling efficient resource utilization across multiple layers.
3Adaptability or versatility
If core layer and enhanced layer signals are combined, then greater flexibility is achieved, but signal power levels must be carefully managed
Solution Approach 1:
The patent applies local quality by assigning different power levels and error correction strengths to different layers based on their specific requirements. The core layer uses robust error correction with lower data rates, while the enhanced layer uses more aggressive coding with higher data rates, optimizing each layer's performance for its intended service.
Solution Approach 2:
The patent changes key parameters such as code rate, modulation order, and power level for different layers to achieve flexible adaptation. By varying these parameters across layers, the system can efficiently accommodate different service requirements while managing power level control through systematic parameter 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, and a time interleaver configured to perform interleaving applied to both the core layer signal and the enhanced layer signal.