Broadcast Frame Bootstrap Signaling for BICM and OFDM Parameters
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Solution Overview
Problem
Existing broadcast signal transmission systems lack an efficient method to signal BICM modes and OFDM parameters, which are crucial for robust transmission of signaling information in broadcasting systems.
Innovation Solution
A broadcast signal frame structure is introduced, comprising a bootstrap and a preamble, where the bootstrap is shorter than the preamble, and includes symbols representing BICM modes and OFDM parameters, allowing for efficient signaling of various SNRs and parameters like FFT size, guard interval, and pilot pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional broadcast signal frame structure is used, then the structure is simple, but the efficiency of signaling BICM modes and OFDM parameters is insufficient
Solution Approach 1:
The broadcast signal frame is segmented into distinct components: bootstrap, preamble, and data portion. The bootstrap contains essential BICM mode and OFDM parameter information, while the preamble provides additional signaling. This segmentation allows efficient signaling of parameters without overwhelming complexity in the overall frame structure.
Solution Approach 2:
The bootstrap is placed at the beginning of the frame to preliminarily signal critical BICM modes and OFDM parameters before the main data transmission. This preliminary action enables the receiver to configure itself properly for decoding the subsequent preamble and data portions, improving overall signaling efficiency.
2Loss of information
If the bootstrap is made longer to include more signaling information, then the signaling capacity increases, but the transmission time increases
Solution Approach 1:
Critical signaling information (BICM modes and OFDM parameters) is extracted and placed in the short bootstrap portion, while less critical or supplementary information is placed in the preamble. This extraction allows the bootstrap to remain short while still conveying essential information, minimizing transmission time overhead.
Solution Approach 2:
The bootstrap provides partial signaling information (just enough for initial configuration), while the preamble provides the remaining signaling details. This partial action approach in the bootstrap avoids unnecessary transmission time while ensuring complete information delivery across both sections.
3Reliability
If robust channel encoding is used for signaling information, then the reliability improves, but the data rate decreases
Solution Approach 1:
Different portions of the frame use different encoding strategies appropriate to their function. The bootstrap uses robust encoding for its critical but small amount of signaling information, while the data portion uses more efficient encoding for bulk data transmission. This local quality differentiation maintains reliability where needed without sacrificing overall data rate.
Data Source
AI summary
An apparatus and method for broadcast signal frame using a bootstrap and a preamble are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a time interleaver configured to generate a time-interleaved signal by performing interleaving on a BICM output signal; and a frame builder configured to generate a broadcast signal frame including a bootstrap and a preamble using the time-interleaved signal.