Bootstrap and Preamble Frame Layout for BICM-OFDM Signaling
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Solution Overview
Problem
Current broadcast signal transmission systems face challenges in efficiently signaling Bit-Interleaved Coded Modulation (BICM) modes and OFDM parameters, particularly in providing various Signal-to-Noise Ratios (SNRs) and simultaneously signaling BICM modes and OFDM parameters like constellation, code rate, FFT size, guard interval, and pilot pattern.
Innovation Solution
A broadcast signal frame structure is developed, incorporating a time interleaver and frame builder to generate a broadcast signal frame with a bootstrap and preamble, where the preamble includes L1-Basic and L1-Detail, and the bootstrap represents the structure of L1-Basic, using a symbol that signals BICM modes and OFDM parameters, including modes for QPSK, 16-NUC, and 64-NUC constellations with specific code rates, and varying parity repetition and puncturing sizes for different robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple broadcast signal frame structure is used, then device complexity is reduced, but the ability to efficiently signal BICM modes and OFDM parameters is compromised
Solution Approach 1:
The broadcast signal frame is segmented into distinct parts: a bootstrap section containing essential BICM mode and OFDM parameter signaling information, and a preamble section containing additional signaling data. This segmentation allows the frame to convey comprehensive signaling information while maintaining a manageable structure that can be processed efficiently by receivers.
2Adaptability or versatility
If multiple BICM modes with various SNRs are supported, then adaptability is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The bootstrap section is designed to carry preliminary signaling information about the BICM mode and OFDM parameters before the main data transmission begins. This preliminary action allows receivers to configure their detection and measurement processes according to the signaled parameters, thereby managing the complexity of detecting multiple BICM modes through pre-configuration rather than complex real-time analysis.
3Manufacturing precision
If BICM modes and OFDM parameters are signaled separately, then manufacturing precision is maintained, but productivity is reduced
Solution Approach 1:
The invention merges BICM mode signaling and OFDM parameter signaling into a unified frame structure where both types of information are transmitted together in the bootstrap and preamble sections. This combining approach maintains the precision of parameter signaling by dedicating specific fields for each parameter while improving productivity by transmitting multiple parameters in a single signaling operation rather than requiring separate signaling procedures.
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.