Broadcast Signal Frame Preamble for Adaptive Time Interleaving
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Solution Overview
Problem
Current broadcast signal transmission/reception systems lack flexibility and performance, particularly in multiplexing technologies, and require efficient signaling related to time-interleaving and optimization of the start position field in the Physical Layer Pipe within a subframe.
Innovation Solution
A broadcast signal frame structure is developed, incorporating a combiner to combine core and enhanced layer signals at different power levels, a power normalizer to adjust signal power, and a time interleaver using various operation modes, including no time interleaving, Convolutional, and Hybrid time interleaving, with a preamble signaling time interleaver information.
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 patent implements dynamic multiplexing where the system can adaptively switch between different multiplexing modes (TDM, FDM, or hybrid) based on channel conditions and service requirements. The multiplexing configuration is not fixed but can be dynamically adjusted to optimize both flexibility and performance for different broadcasting scenarios.
Solution Approach 2:
The patent changes key parameters such as time slot allocation, frequency resource distribution, and power levels dynamically. By adjusting these parameters based on channel quality and service priorities, the system achieves both high flexibility in adapting to different conditions and maintained performance through optimized parameter selection.
2Measurement precision
If a detailed field indicating start position of first complete FEC block is included in preamble for all modes, then signaling precision is improved, but preamble length and complexity increase
Solution Approach 1:
The patent applies partial signaling by including the start position field only when necessary (for convolutional and hybrid time interleaving modes) rather than always including it. This selective approach provides sufficient signaling precision for modes that require it while avoiding unnecessary complexity in modes where the field is not needed.
Solution Approach 2:
The preamble structure becomes dynamic based on the time interleaver mode being used. The system adaptively includes or excludes the start position field according to the operational mode, making the preamble complexity variable rather than fixed, thus optimizing the balance between precision and complexity.
3Adaptability or versatility
If field length is increased to accommodate all time interleaver modes, then signaling coverage is improved, but transmission efficiency decreases
Solution Approach 1:
The patent uses variable-length fields that are sized appropriately for each specific mode rather than using a fixed maximum length for all modes. This partial allocation of signaling resources provides adequate coverage for each mode's needs without the excess overhead that would result from always using the maximum field length.
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 at different power levels; 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 time interleaver uses one of time interleaver groups, and the time interleaver performs the interleaving by using one of a plurality of operation modes.