Layered Division Multiplexing Signal Frame Generation
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Solution Overview
Problem
Current broadcast signal transmission/reception systems lack the flexibility and performance to efficiently multiplex/demultiplex signals across multiple layers with different power levels, limiting their ability to utilize 100% of time and frequency resources in next-generation broadcasting systems.
Innovation Solution
A broadcast signal frame structure is developed, incorporating a combiner to combine core and enhanced layer signals at different power levels, a power normalizer to adjust the power, a time interleaver to generate a time-interleaved signal, and a frame builder to create a broadcast signal frame with a preamble for signaling Physical Layer Pipes (PLPs) and time interleaver information, using the time-interleaved signal.
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 resource utilization is limited and flexibility is reduced
Solution Approach 1:
The patent divides the broadcast signal into multiple layers (core layer and enhanced layer), each with different power levels and service requirements. This segmentation allows different services to be multiplexed efficiently by assigning them to appropriate layers, thereby improving both adaptability and resource utilization compared to traditional TDM or FDM approaches.
2Adaptability or versatility
If multiple services are supported simultaneously, then service diversity is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different power levels and resource allocation strategies to different layers based on their specific service requirements. The core layer uses higher power for robust services, while the enhanced layer uses lower power for additional services, allowing each service to operate optimally while achieving 100% resource utilization across the entire bandwidth.
3Reliability
If signals are combined at different power levels, then multiplexing performance is improved, but signal processing complexity increases
Solution Approach 1:
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) domains. This power-level dimension enables efficient separation and processing of layered signals, improving multiplexing performance while managing processing complexity through structured layer decomposition.
Data Source
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 preamble for signaling, type information of Physical Layer Pipes (PLPs) and time interleaver information shared by the core layer signal and the enhanced layer signal.