Extended Preamble Mapping for Flexible Modem Signal Acquisition
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Solution Overview
Problem
Existing communication systems, such as those adhering to MIL-STD-188-110B and STANAG 4539 standards, have inflexible preambles that cannot easily accommodate additional transmission parameters or modes of operation, limiting their extensibility and automation capabilities.
Innovation Solution
The introduction of an extended preamble with additional bits for conveying setup or transmission parameters, including control bits for error correction and mapping, allows for the inclusion of extra information like digital voice mode, transmission length, and reverse path quality metrics, enhancing the system's automation and data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed preamble with predetermined bits is used for modem acquisition, then reliable signal acquisition is achieved, but the preamble cannot convey additional transmission parameters or modes of operation
Solution Approach 1:
The preamble is segmented into a standard portion (for reliable acquisition) and an extended portion (for additional parameters). The extended preamble contains N information bits, M map bits, and P parity bits, allowing the system to maintain the original reliable acquisition function while adding capability to convey additional transmission parameters such as data rate, interleaver setting, and mode of operation.
Solution Approach 2:
The extended preamble structure provides multi-functionality by serving both as an extension of the standard preamble for reliable acquisition and as a carrier for additional transmission parameters. The mapping algorithm with M map bits allows the same extended preamble structure to convey different types of information depending on the mapping selected, making the system universally applicable to various transmission modes.
2Extent of automation
If additional information is added to convey more transmission parameters, then automation and efficiency are enhanced, but the preamble structure becomes more complex
Solution Approach 1:
The invention manages complexity by changing parameters in a structured way: adding N information bits for transmission parameters, M map bits for identifying mapping algorithms, and P parity bits for error correction. The modular parameter structure allows the system to enhance automation capability while maintaining manageable complexity through systematic organization of the extended preamble elements.
3Reliability
If error correction bits are added to the extended preamble, then reliability of parameter transmission is improved, but the overhead increases
Solution Approach 1:
The invention applies partial error correction by adding only P parity bits specifically for the extended preamble portion, rather than error correction for the entire data transmission. This partial action provides sufficient reliability for the critical parameter transmission while minimizing the overhead increase, balancing reliability improvement with overhead constraints.
Data Source
AI summary
A system communicates data and includes an encoder for encoding communications data. A modulator maps the communications data based on a specific mapping algorithm to form a communications signal over which the communications data can be transmitted. The communications signal includes a preamble that has set-up or transmission parameters used for acquiring the signal at a modem and at least one extended preamble for conveying additional set-up or transmission parameters. This extended preamble includes N extended preamble bits having at least one of information, transmission parameter and control bits and M map bits that identify a predetermined mapping for the N extended preamble bits.