Frame Synchronization Word Merging for Preamble Size Reduction
Solution Overview
Problem
In communication systems, the large size of preambles in data transmissions, especially for short information items and low bit rate transmissions, inefficiently uses frequency bands due to the inclusion of a single frame synchronization word and high redundancy control information, which is detrimental in narrow frequency band scenarios.
Innovation Solution
Implementing multiple frame synchronization words in the preamble, each representing distinct control information items, and generating an association table to optimize frame synchronization words based on error resistance criteria, reducing the overall preamble size and improving frequency band utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single frame synchronization word and high redundancy control information are included in the preamble, then reliability of control information interpretation is improved, but preamble size increases and frequency band efficiency deteriorates
Solution Approach 1:
The patent merges the frame synchronization word and control information items into a unified structure where the synchronization word simultaneously serves as the control information. This is achieved by designing the synchronization word with a specific structure that includes both synchronization functionality and encoded control information, eliminating the need for separate control information fields and reducing preamble size while maintaining reliability through the unified design
Solution Approach 2:
The synchronization word is designed to perform multiple functions simultaneously: it serves as the frame synchronization indicator for receivers and also carries control information items such as modulation type, coding scheme, and redundancy level. This multi-functional design allows the same signal element to provide both synchronization and control functions, improving frequency band efficiency without sacrificing reliability
2Reliability
If a large preamble size is used for reliable control information transmission, then control information reliability is improved, but the ratio of useful information to total transmission size decreases
Solution Approach 1:
By merging the control information items into the synchronization word structure, the patent eliminates redundant data transmission. The control information is embedded within the synchronization word itself rather than being transmitted as separate data, which reduces the overall preamble size and increases the proportion of useful information in the total transmission while maintaining the reliability needed for control information interpretation
3Reliability
If high redundancy control information is transmitted, then control information reliability is improved, but transmission overhead increases
Solution Approach 1:
The patent combines control information items of different redundancy levels into a single integrated synchronization word structure. This allows the system to transmit control information with appropriate redundancy embedded within the synchronization sequence itself, reducing transmission overhead by eliminating separate control information fields while maintaining the reliability benefits of redundancy through the unified encoding scheme
Data Source
AI summary
A method for transmitting useful information between a transmitting terminal and a receiving terminal connected via a transmission channel. The transmitting terminal defines control information for the useful information, and searches in an association table, which is accessible from the transmitting terminal, for a frame-synchronization word associated with the control information. The transmitting terminal generates a frame of data from the useful information, and transmits, over the transmission channel, a data stream that includes the frame-synchronization word and the frame of data.