Transmitter Pilot Sequence Design for Asynchronous Signal Detection
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Solution Overview
Problem
In asynchronous data transmission systems, particularly in telemetry and IoT applications, receivers face challenges in synchronizing with asynchronous packet transmission due to significant frequency deviations and the need for continuous signal checking to detect packets, which increases computational effort and reduces efficiency.
Innovation Solution
The transmitter sends signals with pilot sequences that have repeated base sequence symbols, allowing for subsampling on the receiver side and optimized detection through correlation with reduced effort, using techniques like MSK modulation and phase factors to enhance correlation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver continuously checks the received signal for packet detection in asynchronous transmission, then packet detection capability is improved, but computational effort increases
Solution Approach 1:
The pilot sequence is divided into multiple blocks, where each block contains repeated base sequence symbols. This segmentation allows the receiver to perform correlation analysis on individual blocks rather than processing the entire pilot sequence continuously, reducing computational effort while maintaining detection capability.
Solution Approach 2:
The patent uses repeated base sequence symbols within pilot sequence blocks, which provides redundant information. This allows the receiver to achieve reliable packet detection with partial processing (subsampling) of the signal, rather than requiring full continuous processing of all signal samples.
2Measurement precision
If the receiver performs full correlation analysis on the received signal, then detection accuracy is improved, but processing time increases
Solution Approach 1:
The pilot sequence contains periodically repeated base sequence symbols at regular intervals. This periodic structure enables the receiver to perform correlation analysis at specific intervals (subsampling) rather than continuously, reducing processing time while maintaining detection accuracy through the periodic reinforcement of the correlation peak.
3Productivity
If pilot sequences with repeated base sequence symbols are used, then subsampling and optimized detection are enabled, but pilot sequence design complexity increases
Solution Approach 1:
The patent modifies the pilot sequence structure by changing the repetition parameter R (number of times base sequence symbols are repeated) and the block structure. These parameter changes enable subsampling at the receiver and optimized detection efficiency, while the complexity is managed through systematic parameter selection rather than complex sequence design.
Data Source
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AI summary
The invention relates to a transmitter (1) which is configured in such a way that it transmits signals having a respective pilot sequence with multiple pilot sequence symbols, wherein the transmitter (1) has a signal generator (2), wherein the signal generator (2) is configured in such a way that it provides the pilot sequence based on a basic sequence having multiple basic sequence symbols, wherein the signal generator (2) provides the pilot sequence symbols based on the basic sequence symbol that is successively repeated (R-1) times, and wherein R is a natural number greater than or equal to two, wherein the basic sequence is configured in such a way that a correlation of the pilot sequence with a transmission signal formed by the pilot sequence has a primary maximum that is as narrow as possible and/or secondary maximums that are as small as possible.