Broadcast Signal Frame Preamble for Layered PLP Restoration
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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 layer and enhanced layer signals, then transmission performance is improved, but the start position information and size information of enhanced layer physical layer pipe change, making proper restoration difficult
Solution Approach 1:
The patent divides the physical layer pipes into core layer PLP and enhanced layer PLP, applying different reference timing schemes to each segment. Core layer PLP uses one reference timing while enhanced layer PLP uses another, allowing independent tracking of start position and size information for each layer despite time interleaving operations.
Solution Approach 2:
The patent changes the reference timing parameter differently for core layer and enhanced layer PLPs. By using distinct reference timings, the system maintains accurate start position and size information for the enhanced layer even when time interleaving modifies the signal structure, enabling proper restoration at the receiver.
2Reliability
If different reference timings are used for core layer and enhanced layer PLPs, then proper restoration is enabled, but system complexity increases
Solution Approach 1:
The patent establishes different reference timings in advance during the frame generation process. The frame builder pre-configures separate reference timing values for core layer and enhanced layer PLPs, and this information is signaled to the receiver beforehand, enabling accurate restoration without complex real-time calculations.
Solution Approach 2:
Instead of using a single unified reference timing and trying to compensate for changes, the patent inverts the approach by assigning different reference timings from the outset. This allows each layer to independently track its parameters without requiring complex compensation mechanisms, simplifying the overall system while maintaining accuracy.
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.