Receiver Frequency Synchronization via Partial Pilot Sequence Merging
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Solution Overview
Problem
Existing data transmission systems face challenges in achieving satisfactory synchronization, particularly frequency synchronization, when using telegram splitting in asynchronous package transmission.
Innovation Solution
The proposed solution involves a receiver designed to receive multiple telegram fragments, each with a partial pilot sequence, which complement each other to form a complete pilot sequence. The receiver uses the Discrete Fourier Transform (DFT) procedure to determine the frequency difference between the transmission and reception frequencies by combining decision-making variables from each partial pilot sequence and determining a maximum value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If telegram splitting is used in asynchronous packet transmission, then system robustness against packet collisions is improved, but frequency synchronization accuracy deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the pilot sequence into multiple partial pilot sequences, each associated with a telegram fragment. This allows the system to maintain robustness against packet collisions while enabling accurate frequency synchronization through the combined evaluation of multiple fragments. The receiver processes each fragment's partial pilot sequence and combines the results to achieve overall synchronization accuracy.
2Measurement precision
If multiple partial pilot sequences are combined for frequency estimation, then frequency synchronization accuracy is improved, but receiver processing complexity increases
Solution Approach 1:
The patent merges multiple partial pilot sequences from different telegram fragments into a unified frequency estimation process. The receiver combines the decision variables from each partial pilot sequence using the DFT procedure, effectively merging their information to achieve accurate frequency synchronization. This combining approach improves accuracy while managing complexity through systematic integration.
Data Source
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AI summary
A transmitter (1) is designed to transmit at least one signal with a pilot sequence comprising several pilot symbols, wherein the transmitter (1) comprises a signal generator (2), wherein the signal generator (2) provides the pilot sequence, wherein the signal generator (2) provides the pilot sequence such that the pilot sequence comprises at least two symbol groups, each comprising at least two pilot symbols, and wherein, when evaluating a signal received by a receiver (10) as a result of the transmission of the signal, the symbol groups generate phase errors dependent on a time offset between a reference time of the transmission of the signal by the transmitter (1) and a value assumed and/or estimated for the reference time for the evaluation, which essentially compensate each other during the evaluation across the symbol groups.