OFDM Frame Configuration with Preamble and Dummy Symbols
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Solution Overview
Problem
Existing digital broadcasting systems lack flexibility in frame configuration, which affects data transmission efficiency and reception quality.
Innovation Solution
A frame configuration method using orthogonal frequency-division multiplexing (OFDM) symbols, where transmission data is allocated to multiple areas identified by time and frequency resources, including a first period with a preamble and a second period with data and dummy symbols, allowing for flexible frame configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed frame configuration is used in digital broadcasting systems, then the system structure is simple and reliable, but the flexibility to adapt to different transmission scenarios is poor
Solution Approach 1:
The frame is divided into multiple areas (first area, second area, third area) with different functions. The first area contains preamble and control information, the second area contains data symbols, and the third area contains dummy symbols. This segmentation allows flexible configuration of data transmission while maintaining a structured overall frame format.
Solution Approach 2:
The patent introduces dynamic frame configuration where the number of data symbols and dummy symbols can be adjusted based on transmission requirements. The frame can adapt between different modes (e.g., unicast, multicast, broadcast) by changing the allocation of resources in different areas, providing flexibility without requiring a completely new frame structure.
2Productivity
If data transmission efficiency is improved through flexible frame configuration, then data reception quality improves, but the complexity of frame processing increases
Solution Approach 1:
The frame structure includes a preamble in the first area that contains control information and synchronization signals. This preliminary action allows the receiver to first understand the frame configuration and allocation before processing the actual data in the second area, simplifying the data reception process despite the flexible configuration.
Solution Approach 2:
Dummy symbols in the third area act as placeholders that maintain the temporal structure of the frame. These intermediary elements allow the frame to be flexible in data allocation while maintaining a regular time structure that simplifies receiver processing and synchronization.
3Adaptability or versatility
If dummy symbols are added to maintain frame structure, then frame configuration flexibility is improved, but transmission time is increased
Solution Approach 1:
The dummy symbols are placed in a specific local area (third area) of the frame rather than throughout the entire frame. This localized approach maintains the necessary temporal structure for flexibility in data allocation while minimizing the impact on overall transmission time. The dummy symbols only occupy the time resources where structural maintenance is needed.
Data Source
AI summary
A transmitting method includes: configuring a frame using a plurality of orthogonal frequency-division multiplexing (OFDM) symbols, by allocating a plurality of transmission data to a plurality of areas; and transmitting the frame. The plurality of areas are each identified by at least one time resource among resources and at least one frequency resource among frequency resources. The frame includes a first period in which a preamble is transmitted, and a second period in which the plurality of transmission data are transmitted by at least one of time division and frequency division. The second period includes a first area, and the first area includes a data symbol generated from first transmission data, a data symbol generated from second transmission data and subsequent to the data symbol generated from the first transmission data, and a dummy symbol subsequent to the data symbol generated from the second transmission data.