Correlator for Radio Transmission Frequency Drift
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Solution Overview
Problem
Existing data receivers struggle to detect pilot sequences subject to large time-varying frequency drifts, which occurs due to relative movement between the transmitter and receiver or oscillator mismatches, leading to ineffective signal detection.
Innovation Solution
A data receiver is configured with a detector having a correlator that adjusts a correlation pattern in frequency to compensate for time-varying frequency shifts, allowing detection of pilot sequences even under significant frequency drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detection methods are used for pilot sequences, then detection is simple and straightforward, but detection fails when large time-varying frequency drift occurs
Solution Approach 1:
The patent applies the dynamics principle by making the correlation pattern adjustable and adaptable to changing frequency conditions. The correlation pattern is dynamically modified based on estimated frequency drift, allowing the detection system to maintain reliability under time-varying frequency conditions rather than using a fixed static pattern
Solution Approach 2:
The patent implements parameter changes by modifying the correlation pattern parameters (such as timing offsets and frequency adjustments) based on the estimated frequency drift. This allows the detection mechanism to adapt its parameters to compensate for frequency shifts, resolving the contradiction between maintaining simple detection and achieving reliable detection under drift conditions
2Measurement precision
If the correlation pattern is adjusted in frequency to compensate for time-varying frequency shift, then detection accuracy improves, but the complexity of the detection system increases
Solution Approach 1:
The patent applies feedback by using the detected frequency drift information to adjust the correlation pattern. The system estimates the frequency shift from the received signal and feeds this information back to modify the correlation pattern, creating a closed-loop system that improves detection accuracy while managing complexity through intelligent adaptation
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing multiple correlation patterns that can be selected based on the estimated frequency drift. This allows the system to prepare compensation measures in advance rather than computing complex adjustments in real-time, improving detection accuracy while controlling system complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables effective detection of pilot sequences with large time-varying frequency drifts, improving signal reception and data packet detection accuracy.
Implementation Method 1
at least a second pilot sequence of the at least two pilot sequences has a time-varying frequency shift (frequency drift) (e.g., due to a Doppler effect) compared to a first pilot sequence
Data Source
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AI summary
Embodiments relate to a data receiver, wherein the data receiver is configured to receive a signal from a data transmitter, and the signal has at least two pilot sequences which are distributed in time and optionally in frequency according to a pilot pattern. At least one second pilot sequence of the at least two pilot sequences has a frequency shift which can change over time in contrast to a first pilot sequence of the at least two pilot sequences, and the data receiver has a packet detector with a correlator which is configured to detect the at least two pilot sequences on the basis of a correlation pattern, said correlation pattern being adapted with respect to the frequency in order to reduce the influence of the frequency shift.