Broadcast Frame Preamble Signaling for FEC Block Start Alignment
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Solution Overview
Problem
Current broadcast signal transmission/reception systems lack flexibility and performance, particularly in multiplexing technologies, and struggle with efficient signaling for time-interleaving, especially when convolutional time interleaving is used, and indicating the start position of a first complete FEC block in a Physical Layer Pipe within a subframe.
Innovation Solution
A broadcast signal frame structure is developed, incorporating a combiner to multiplex core and enhanced layer signals, a power normalizer to adjust signal power, a time interleaver for efficient interleaving, and a frame builder to include a preamble signaling time interleaver information, specifically indicating the start position of the first complete FEC block for each Physical Layer Pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDM or FDM multiplexing techniques are used, then signal transmission is achieved, but flexibility and performance are limited
Solution Approach 1:
The signal is divided into multiple segments (core layer signal and enhanced layer signal) that can be independently processed and transmitted. This segmentation allows flexible allocation of resources to different service types while maintaining reliable transmission through independent error correction coding for each layer.
Solution Approach 2:
The patent transitions from traditional time-frequency domain multiplexing (TDM/FDM) to a layered structure that adds a new dimension of signal organization. By separating signals into core and enhanced layers with different power levels and error correction schemes, the system achieves both flexibility in service allocation and improved performance through hierarchical protection.
2Reliability
If convolutional time interleaving is used, then time-interleaving performance is improved, but signaling complexity increases
Solution Approach 1:
The patent performs preliminary organization of data into complete FEC blocks before time interleaving. By pre-structuring the data and identifying block boundaries in advance, the system enables efficient convolutional time interleaving without requiring complex real-time signaling, thus improving performance while controlling complexity.
Solution Approach 2:
The patent introduces an intermediary structure (the defined field indicating start position of first complete FEC block) that mediates between the time interleaver and the receiver. This intermediary element simplifies the signaling requirement by providing a clear reference point that enables the receiver to properly synchronize and process the time-interleaved signal.
3Measurement precision
If start position of first complete FEC block is signaled, then receiver synchronization is improved, but frame structure complexity increases
Solution Approach 1:
The patent extracts the essential synchronization information (start position of first complete FEC block) as a separate, dedicated field in the frame structure. By isolating this critical information, the system achieves precise receiver synchronization without requiring complex embedded synchronization patterns, thus improving measurement precision while keeping the overall frame structure relatively simple.
Data Source
AI summary
An apparatus and method for generating a broadcast signal frame corresponding to a time interleaver supporting a plurality of operation modes 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 preamble includes a field indicating a start position of a first complete FEC block corresponding to each of physical layer pipes.