Broadcast Signal Frame Structure Using Layered Division Multiplexing
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Solution Overview
Problem
Existing broadcast signal multiplexing technologies, such as TDM and FDM, lack the flexibility and performance required for next-generation broadcasting systems, and do not allow for efficient utilization of time and frequency resources for multiple services.
Innovation Solution
A broadcast signal frame structure that combines core and enhanced layer signals at different power levels, using Layered Division Multiplexing (LDM) to efficiently multiplex and demultiplex signals, incorporating a bootstrap and preamble, and employing OFDM transmission and reception with interleaving and power normalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDM or FDM is used for multiplexing, then multiple services can be transmitted, but time and frequency resources cannot be fully utilized and flexibility is limited
Solution Approach 1:
The patent changes the multiplexing parameter from traditional TDM/FDM to LDM, which uses power level differentiation as the key parameter. This allows services to be multiplexed with different power levels (core layer with lower power, enhanced layer with higher power), enabling full utilization of time and frequency resources while providing greater flexibility in service configuration and transmission.
2Adaptability or versatility
If traditional multiplexing is used, then device complexity is reduced, but performance and flexibility for next-generation systems are insufficient
Solution Approach 1:
The patent segments the signal into core layer and enhanced layer with different power levels. The core layer carries basic service information with lower power, while the enhanced layer carries additional service information with higher power. This segmentation enables next-generation system performance by allowing selective reception and processing, though it does increase signal processing complexity at the receiver.
3Productivity
If LDM is implemented with power level differentiation, then resource utilization reaches 100%, but signal processing and demultiplexing complexity increases
Solution Approach 1:
The patent uses power level as the differentiating parameter for LDM implementation. By assigning different power levels to core and enhanced layers, the system achieves 100% resource utilization. The demultiplexing process exploits this power level difference to separate layers, which simplifies the processing compared to other multiplexing methods while still achieving full resource utilization.
Data Source
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AI summary
An apparatus and method for broadcast signal frame using layered division multiplexing are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal at different power levels; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame including a bootstrap and a preamble using the time-interleaved signal.