Layered Signal Multiplexing for Power-Normalized 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, particularly in efficiently multiplexing and demultiplexing signals across multiple layers 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 a time interleaver, with an injection level controller to adjust power levels and a power normalizer to maintain signal integrity, allowing for efficient multiplexing and demultiplexing of signals across multiple layers.
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 introduces a new dimension for signal multiplexing by combining signals at different power levels (amplitude dimension) rather than only in time (TDM) or frequency (FDM). This power-level dimension provides additional flexibility for signal composition and improves system performance through layered transmission.
2Productivity
If signals are multiplexed using traditional methods, then transmission is possible, but efficiency in multiplexing/demultiplexing signals across multiple layers is reduced
Solution Approach 1:
The patent applies preliminary actions by performing error correction encoding and bit interleaving separately for each layer before multiplexing. This pre-processing simplifies the demultiplexing process at the receiver and improves overall multiplexing efficiency by preparing signals in advance for their specific transmission requirements.
Solution Approach 2:
The patent changes parameters by assigning different power levels, error correction codes, and modulation schemes to different layers based on their specific requirements. This parameter differentiation enables efficient multiplexing of diverse signals while managing complexity through standardized processing procedures for each layer type.
3Reliability
If core layer and enhanced layer signals are combined at different power levels, then flexibility and performance are improved, but power distortion may occur during transmission
Solution Approach 1:
The patent applies beforehand cushioning by reducing the power of the enhanced layer signal before combining it with the core layer signal. This pre-adjustment prevents power distortion during transmission and ensures that the combined signal maintains proper power levels, protecting signal integrity throughout the transmission process.
Solution Approach 2:
The patent changes the power parameter of the enhanced layer signal by applying a reduction factor before combination. This parameter adjustment resolves power distortion issues while maintaining the benefits of layered transmission, allowing flexible power level management without compromising signal integrity.
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.