Layered Broadcast Signal Frames for Power-Domain Multiplexing
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Solution Overview
Problem
Current broadcast signal transmission/reception systems lack flexibility and performance, particularly in supporting multiple services simultaneously while efficiently utilizing time and frequency resources, and effectively multiplexing/demultiplexing signals at different power levels.
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 signal 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 time interleaver information, enabling efficient multiplexing and demultiplexing of signals across Physical Layer Pipes (PLPs) with varying power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Time Division Multiplexing (TDM) or Frequency Division Multiplexing (FDM) is used to support multiple services, then multiple services can be transmitted simultaneously, but time and frequency resources cannot be fully utilized and flexibility is limited
Solution Approach 1:
The patent changes the fundamental parameter of signal multiplexing from time/frequency division to power level division. By assigning different power levels to core layer and enhanced layer signals, the system achieves flexible support for multiple services while fully utilizing time and frequency resources, as both layers share the same time and frequency slots without mutual exclusion.
Solution Approach 2:
The patent introduces a new dimension for signal multiplexing by utilizing power level as the distinguishing parameter. Instead of separating services in time or frequency domains, the invention stacks signals in the power domain, allowing core and enhanced layers to coexist in the same time-frequency resources with different power allocations, thereby achieving 100% resource utilization while supporting multiple services.
2Productivity
If traditional multiplexing techniques are used, then signal transmission is straightforward, but efficiency in multiplexing/demultiplexing signals at different power levels is poor
Solution Approach 1:
The patent changes the multiplexing parameter from time/frequency to power level, enabling efficient multiplexing/demultiplexing operations. The combiner efficiently multiplexes signals by adding them at different power levels, while the power normalizer efficiently demultiplexes by adjusting power levels and enabling signal cancellation, achieving high efficiency without excessive complexity.
Solution Approach 2:
The patent introduces a power normalizer as an intermediary device between the combiner and the demodulator. This intermediary component adjusts the power levels of combined signals and enables efficient signal cancellation at the receiver, facilitating effective multiplexing/demultiplexing operations while maintaining manageable system complexity.
3Adaptability or versatility
If signals are combined at different power levels, then flexibility in service support is improved, but signaling information for layers with different power levels becomes more complex
Solution Approach 1:
The patent segments signaling information into distinct components: layer identification information that identifies core and enhanced layers, and PLP identification information that identifies Physical Layer Pipes. This segmentation allows the receiver to systematically process and distinguish between different layers and their associated signaling, managing the complexity of power level differentiation effectively.
Solution Approach 2:
The patent performs preliminary signaling of layer identification information and power level parameters before the actual data transmission. The preamble contains pre-configured information about the number of layers, their power levels, and PLP associations, allowing the receiver to prepare appropriate demultiplexing and processing parameters in advance, thereby reducing information loss and processing complexity during active transmission.
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 time interleaver information shared by the core layer signal and the enhanced layer signal, using the time-interleaved signal.