Broadcast Signal Frame Structure for Layered Multi-Mode 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 to perform interleaving using various modes, including no time interleaving, Convolutional, and Hybrid time interleaving, with a frame builder generating a broadcast signal frame containing preamble information for time interleaver signaling.
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 applies parameter changes by dynamically adjusting time interleaver modes, field lengths, and signaling parameters to optimize system performance. The frame structure allows flexible configuration of time interleaving parameters, enabling the system to adapt to different channel conditions and service requirements, thereby achieving greater flexibility beyond traditional TDM/FDM approaches.
2Reliability
If time interleaving is applied to both core and enhanced layer signals, then signal robustness is improved, but signaling complexity increases
Solution Approach 1:
The patent implements universality by designing a unified time interleaver that processes both core and enhanced layer signals through the same mechanism. The single time interleaver structure handles multiple layers with different power levels, reducing the need for separate signaling mechanisms and thereby lowering signaling complexity while maintaining robustness across all layers.
Solution Approach 2:
The patent applies dynamics by enabling the time interleaver to operate in multiple modes (no time interleaving, Convolutional time interleaving, and Hybrid time interleaving). The system can dynamically select the appropriate mode based on channel conditions and service requirements, allowing flexible control over the trade-off between robustness and signaling overhead.
3Loss of information
If the field indicating start position of first complete FEC block is included for all modes, then signaling completeness is maintained, but field length optimization is reduced
Solution Approach 1:
The patent applies local quality by differentiating the treatment of the start position field based on the time interleaver mode. For modes where time interleaving is applied (first and second modes), the field is included with appropriate length to indicate the start position of the first complete FEC block. For the third mode (Hybrid time interleaving), the field is excluded as the structure inherently provides this information. This localized adaptation optimizes field length efficiency while maintaining necessary signaling completeness.
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.