Layered Signal Multiplexing for Flexible Broadcast Power Control

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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

VSEngineering 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

Engineering Contradiction:

ImproveflexibilityVSAvoidperformance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The signal is divided 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 of critical core layer signals.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different power levels are assigned to different signal layers based on their importance and channel conditions. The core layer uses higher power for reliable transmission, while the enhanced layer uses lower power, optimizing overall system performance and flexibility.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If signals are multiplexed at different power levels, then flexibility and performance are improved, but signal integrity and power distortion may occur during transmission

Engineering Contradiction:

ImproveflexibilityVSAvoidsignal integrity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Power normalization is performed in advance before signal transmission to ensure that the combined multiplexed signal maintains appropriate power levels. This preliminary power adjustment prevents distortion during transmission while preserving the benefits of multi-layer power-level multiplexing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The power levels of different signal layers are dynamically adjusted and normalized to maintain signal integrity. By changing the power parameter appropriately before transmission, the system achieves both flexibility in signal multiplexing and preservation of signal quality.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11102048B2Signal multiplexing device and signal multiplexing method using layered division multiplexing

Publication Date: 2021.08.24 ELECTRONICS & TELECOMM RES INST

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.