Frequency Synchronization Using Specific Code Patterns in Receivers
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Solution Overview
Problem
Existing data receiving apparatuses face challenges in synchronizing clocks during intermittent data transmission, particularly in wireless communication systems, where accurate frequency adjustment is crucial but often hindered by signal distortions and varying transmission clock frequencies.
Innovation Solution
The apparatus incorporates specific code patterns and repetitive patterns to measure frequency differences, allowing for both rough and fine adjustments of the receiving clock to synchronize with the transmission clock, with mechanisms to detect signal deterioration and switch between adjustment methods as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a long preamble is used for frequency synchronization, then frequency synchronization accuracy is improved, but data transfer capacity is reduced
Solution Approach 1:
The synchronization process is segmented into two distinct stages: coarse frequency adjustment using specific code patterns inserted at predetermined intervals, and fine frequency adjustment using repetitive patterns. This segmentation allows each stage to use optimized patterns for its specific purpose, achieving high synchronization accuracy without requiring a long preamble.
Solution Approach 2:
Specific code patterns are inserted at predetermined intervals throughout the data transmission to enable preliminary frequency difference measurements. This preliminary action allows the receiver to continuously track and adjust frequency deviations during transmission, maintaining synchronization accuracy without extending the initial preamble.
2Reliability
If frequency adjustment is performed continuously during intermittent transmission, then frequency synchronization is maintained, but device complexity increases
Solution Approach 1:
The frequency adjustment mechanism dynamically switches between two modes based on transmission state: during active transmission, it performs fine adjustment using repetitive patterns; during idle periods, it performs coarse adjustment using specific code patterns. This dynamic operation maintains synchronization reliability while keeping the device complexity manageable through conditional execution.
Solution Approach 2:
The system uses the transmitted data itself (specific code patterns and repetitive patterns embedded in the communication data) as the reference for frequency measurement, eliminating the need for external reference signals or complex separate synchronization channels. The communication data serves its dual purpose of information transfer and frequency synchronization reference.
3Measurement precision
If multiple frequency measurement methods are used, then measurement precision is improved, but processing time increases
Solution Approach 1:
Coarse frequency adjustment using specific code patterns is performed preliminarily to bring the frequency deviation within an acceptable range. This preliminary action reduces the magnitude of frequency error before fine adjustment begins, allowing the fine adjustment process to converge faster and achieve high precision more quickly.
Solution Approach 2:
Frequency measurements are performed periodically using specific code patterns inserted at predetermined intervals during transmission. This periodic measurement approach allows continuous frequency tracking without requiring continuous processing, balancing measurement precision with processing time efficiency.
Data Source
AI summary
In a receiving apparatus for receiving communication data from a transmitting apparatus, specific code patterns are inserted in the communication data at predetermined intervals. The receiving apparatus includes a first frequency difference measurement device for measuring a first frequency difference between a receiving clock of the receiving apparatus and a transmission clock provided to the communication data, based on one of the specific code patterns and another of the specific code patterns which is positioned later; and a frequency adjustment device for adjusting a frequency of the receiving clock based on the measured first frequency difference so that the frequency substantially coincides with a frequency of the transmission clock.