Broadcast Signal Frame Using Layered Division Multiplexing
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Solution Overview
Problem
Current broadcast signal transmission/reception systems face limitations in flexibility and performance, particularly in multiplexing technologies, as they rely on Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM), which are inadequate for next-generation broadcasting systems.
Innovation Solution
A broadcast signal frame structure is developed that incorporates layered division multiplexing, using a combiner to combine core and enhanced layer signals, a power normalizer to adjust power levels, and a time interleaver to generate a time-interleaved signal, with the option to insert dummy values to match the number of Enhanced Layer cells with Core Layer cells, and utilizing a predetermined scrambling sequence for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If TDM or FDM is used for signal multiplexing, then the system structure is simple and easy to implement, but the flexibility and performance are insufficient for next-generation broadcasting systems
Solution Approach 1:
The signal is divided into multiple layers (core layer and enhanced layer) with different power levels and modulation schemes. Each layer can be independently processed and transmitted, allowing the system to adapt to different service requirements while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces a new dimension of signal processing by using layered division multiplexing with different power levels and modulation orders. This adds flexibility without requiring complete redesign of the multiplexing framework, as it builds upon existing TDM/FDM concepts while operating in an additional power/modulation dimension.
2Adaptability or versatility
If layered division multiplexing is used to improve flexibility and performance, then the system becomes more complex, but this increases device complexity and processing requirements
Solution Approach 1:
The system segments signals into core and enhanced layers with distinct processing chains. The core layer uses robust modulation and coding for reliable transmission, while the enhanced layer uses higher-order modulation for efficient data transmission. This segmentation allows independent optimization of each layer without increasing overall system complexity significantly.
Solution Approach 2:
The patent designs the layered division multiplexing system to be universally applicable to various broadcasting scenarios. The same framework can accommodate different numbers of layers, different modulation schemes, and different service types, reducing the need for multiple specialized systems and thereby managing complexity through versatility.
3Productivity
If dummy values are inserted to match the number of Enhanced Layer cells with Core Layer cells, then the layered division multiplexing can be efficiently performed, but this increases the amount of data processing required
Solution Approach 1:
Dummy values are inserted into the enhanced layer data stream before the multiplexing process to ensure that the data lengths of core and enhanced layers match. This preliminary action prevents delays during the multiplexing operation itself, as the length mismatch issue is resolved in advance, thereby improving overall multiplexing efficiency while minimizing processing time impact.
Data Source
AI summary
An apparatus and method for generating a broadcast signal frame using enhanced layer dummy values 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; 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 time interleaver information corresponding to the time interleaver, the time interleaver uses one of time interleaver groups, and enhanced layer data corresponding to the one of the time interleaver groups include dummy values.