Broadcast Frame Preamble Signaling for Interleaved Core and Enhanced PLPs
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Solution Overview
Problem
Existing broadcast signal transmission/reception systems face challenges in properly restoring core and enhanced layer physical layer pipes due to changes in size and start position information caused by time interleaving.
Innovation Solution
A parameter signaling scheme is implemented using an apparatus that generates a broadcast signal frame by combining core and enhanced layer signals, normalizing power, performing time-interleaving, and including a preamble for signaling start and size information for each Physical Layer Pipe (PLP).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time interleaving is applied to both core layer and enhanced layer signals, then error correction performance is improved, but start position information and size information of physical layer pipes change making restoration difficult
Solution Approach 1:
The patent applies preliminary action by pre-calculating and signaling the start position and size information of physical layer pipes before time interleaving is applied. The frame builder generates and includes this information in the broadcast signal frame in advance, allowing the receiver to properly restore the pipes despite subsequent interleaving operations that would otherwise change these parameters.
Solution Approach 2:
The patent uses an intermediary approach by introducing a signaling mechanism that carries start position and size information as metadata alongside the actual signal. This intermediary information structure allows the receiver to track and restore physical layer pipe parameters accurately even though the actual signal undergoes time interleaving that would normally alter these parameters.
2Productivity
If layered division multiplexing is used to transmit multiple services, then system capacity is improved, but parameter signaling complexity increases
Solution Approach 1:
The patent merges the signaling of start position and size information into a unified frame structure that handles both core layer and enhanced layer physical layer pipes together. By combining these parameters into a single signaling mechanism within the broadcast signal frame, the system manages multiple services through layered division multiplexing without proportionally increasing signaling complexity.
Solution Approach 2:
The patent creates a universal signaling structure that can handle multiple types of physical layer pipes (core layer and enhanced layer) using the same parameter signaling mechanism. This multi-functional approach allows the system to support multiple services with different requirements while using a single, standardized parameter signaling method, thereby increasing system capacity without linearly increasing complexity.
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.