Layered Signal Multiplexing with Power Normalization
Find Innovative SolutionsGenerate Solutions
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 for next-generation broadcasting systems are insufficient
Solution Approach 1:
The patent segments signals 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 changes the power parameter of different signal layers, transmitting core layer signals at higher power and enhanced layer signals at lower power. This parameter variation allows the system to adapt to different channel conditions and service requirements, providing both flexibility and performance.
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 signal to the appropriate power level, the system achieves efficient multiplexing while simplifying the overall power management process.
Solution Approach 2:
The patent introduces a power scaler as an intermediary component that adjusts the power level of the enhanced layer signal before combination. This intermediary element simplifies the power adjustment process by handling it in a dedicated stage, reducing overall system complexity.
3Stability of the object's composition
If power normalization is applied to the multiplexed signal, then signal power consistency is achieved, but additional processing steps are required
Solution Approach 1:
The patent merges the power normalization function into the existing signal processing chain by applying it after the layer combination stage. This consolidation ensures signal power consistency while minimizing additional processing steps by integrating the normalization into the overall multiplexing workflow.
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.