Broadcast Signal Frame Preamble for Multi-Mode 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 to generate a time-interleaved signal 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 by allowing the system to adaptively select between different multiplexing modes (TDM, FDM, or hybrid) based on channel conditions and service requirements. The multiplexing configuration can be dynamically adjusted through signaling parameters, enabling the system to transition between static and dynamic operation modes to optimize both flexibility and performance.
Solution Approach 2:
The patent changes key multiplexing parameters such as time slot allocation, frequency resource distribution, and power level assignments to achieve optimal performance. By dynamically adjusting these parameters based on channel quality and service priorities, the system overcomes the rigidity of traditional TDM/FDM while maintaining transmission reliability.
2Reliability
If time interleaving is applied to both core and enhanced layers, then error performance is improved, but signaling complexity increases
Solution Approach 1:
The patent merges the time interleaving operation for core and enhanced layers into a unified process. By applying a single time interleaver to the multiplexed signal containing both layers, the system achieves error performance improvement without requiring separate interleaving control signaling for each layer, thus reducing overall signaling complexity.
Solution Approach 2:
The time interleaver is designed to serve multiple functions simultaneously: it provides error protection for both core and enhanced layers, performs time diversification, and enables flexible service delivery. This multi-functional design reduces the need for additional dedicated signaling mechanisms.
3Measurement precision
If a field indicating start position of FEC block is included in preamble, then positioning accuracy is improved, but preamble length increases
Solution Approach 1:
The patent applies local quality optimization by selectively including the start position field in the preamble only when time interleaving is configured for the enhanced layer. When time interleaving is not used or only applied to the core layer, the field is omitted. This conditional inclusion provides positioning accuracy where needed while minimizing preamble length in other scenarios.
Solution Approach 2:
The preamble structure is made dynamic by conditionally including or excluding the start position field based on the time interleaving configuration. This dynamic adaptation allows the system to optimize the balance between positioning accuracy and preamble length according to actual transmission requirements.
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.