Analog Signal Sampling for Precise Transit Time Synchronization
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Solution Overview
Problem
Existing digital transmission systems face limitations in accurately determining the temporal position and phase relationship of signals, leading to suboptimal synchronization and transit time measurement, especially in systems where analog signals are used for data transmission, with current methods offering accuracy up to a quarter of the symbol or chip rate.
Innovation Solution
The method exploits the precise signal characteristics of analog signals to determine the temporal position and phase relationship with higher accuracy than existing systems, using the actual sample values rather than threshold value decisions, allowing for synchronization and transit time measurement with precision better than one quarter of the symbol or chip rate without increasing hardware demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If threshold value decisions are used to decode information from signals, then digital information can be recovered, but the accuracy of temporal position determination is limited to about one quarter of the symbol or chip rate
Solution Approach 1:
The patent changes the parameter used for signal evaluation from binary threshold decisions to continuous sample values. By utilizing the actual amplitude values of the analog signal samples rather than reducing them to binary decisions, the system achieves higher temporal position determination accuracy (better than one quarter of symbol rate) without adding hardware complexity, as the same ADC samples are reused for multiple purposes
Solution Approach 2:
The patent introduces an intermediary processing step where the analog signal characteristic (sample values) is analyzed to determine temporal position before final digital decoding. This intermediary measurement of the analog signal's temporal characteristics enables high-precision timing extraction without interfering with the standard digital decoding process
2Measurement precision
If sampling rate is increased to improve temporal position accuracy, then measurement precision improves, but hardware demands increase
Solution Approach 1:
The patent changes the evaluation parameter from binary threshold crossings to continuous analog sample values. This allows achieving high temporal resolution (better than one quarter of symbol rate) at the existing sampling rate, eliminating the need for higher sampling rates and their associated hardware complexity
Solution Approach 2:
The patent makes the existing ADC samples serve dual purposes: both for digital information decoding and for high-precision temporal position determination. By extracting timing information from the same analog samples used for data recovery, the system avoids the need for separate high-speed timing measurement hardware
Data Source
AI summary
The invention relates to a method for improving transit time and/or phase measurement and/or for synchronization in digital transmission systems. According to the invention, at least one first, particularly digital, piece of information in at least one first analog signal is transmitted in encoded form between two objects by means of the transmission system and at least one first sample value of the at least one first analog signal is used to determine a temporal position and/or phase relationship. The at least one first sample value lies in a rising or falling edge of the at least one first analog signal and/or of the at least one first received analog signal, which can be recognized, for example, from the sample value itself and/or the characteristic of adjacent sample values.