Broadcast Frame Preamble Signaling for Enhanced Layer PLP Recovery
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Solution Overview
Problem
Current broadcast signal transmission systems face challenges in properly restoring core and enhanced layer physical layer pipes, especially when size and start position information of the enhanced layer pipe changes due to time interleaving, requiring an effective parameter signaling scheme.
Innovation Solution
A broadcast signal frame generation apparatus that combines core and enhanced layer signals, normalizes power, performs time-interleaving, and includes a preamble for signaling start and size information for each Physical Layer Pipe (PLP), using different reference timings and generation schemes for core and enhanced layer PLPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time interleaving is applied to both core and enhanced layer signals, then error correction performance is improved, but the start position and size information of enhanced layer PLP changes making restoration difficult
Solution Approach 1:
The patent segments the physical layer pipes into core layer PLP and enhanced layer PLP, applying different reference timing schemes to each segment. The core layer uses a first reference timing while the enhanced layer uses a second reference timing, allowing independent tracking of their respective start positions and sizes through separate signaling mechanisms.
Solution Approach 2:
The patent changes the parameter reference basis for different layers: the core layer PLP start position and size are signaled relative to the first reference timing, while the enhanced layer PLP start position and size are signaled relative to the second reference timing. This parameter differentiation enables proper restoration despite time interleaving effects.
2Reliability
If different reference timings are used for core and enhanced layer PLPs, then proper restoration is enabled, but the signaling scheme complexity increases
Solution Approach 1:
The patent creates a universal signaling framework where the same preamble structure carries different types of information for different layers. The preamble simultaneously signals core layer PLP parameters (start position, size) and enhanced layer PLP parameters (start position, size) using a unified multi-function signaling mechanism that reduces overall system complexity.
3Adaptability or versatility
If layered division multiplexing is implemented, then transmission flexibility is improved, but the decoding process becomes more complex
Solution Approach 1:
The patent performs preliminary signaling of all necessary parameters (core layer PLP start position, size, and enhanced layer PLP start position, size) in the preamble before the actual data transmission. This preliminary action provides the receiver with all required information in advance, simplifying the subsequent decoding process despite the layered division multiplexing structure.
Data Source
AI summary
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 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 time-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 start position information and size information for each of Physical Layer Pipes (PLPs). In this case, the Physical Layer Pipes include a core layer physical layer pipe corresponding to the core layer signal and an enhanced layer physical layer pipe corresponding to the enhanced layer signal.