Sequence Synchronization Using In-Phase Training Symbols
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Solution Overview
Problem
In high-rate multicarrier communication systems, existing sequence synchronization methods require significant storage space and computational complexity, leading to high error probabilities and reduced accuracy due to the need for long correlation sequences and complex operations.
Innovation Solution
A sequence synchronization apparatus and method that uses a training symbol in-phase modulated or modulated with a fixed phase difference across subcarriers, allowing for detection-based synchronization with minimal complexity, simplicity, and accuracy by leveraging power or amplitude differences between training and data symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correlation operation is performed with a long local correlation sequence to achieve accurate sequence synchronization, then measurement precision is improved, but device complexity and computational complexity increase significantly
Solution Approach 1:
The patent extracts only the essential characteristic of the training symbol (power or amplitude difference) for synchronization, rather than using the complete long correlation sequence. This allows achieving accurate synchronization by detecting only the key feature that distinguishes training symbols from data symbols, thereby reducing computational complexity while maintaining precision.
Solution Approach 2:
The patent changes the synchronization approach from using correlation operations with long sequences to detecting power or amplitude parameters of training symbols. By transforming the synchronization metric from correlation values to simple power/amplitude measurements, the system achieves accurate synchronization with minimal computational complexity.
2Measurement precision
If correlation operation is performed with a long sequence to ensure synchronization accuracy, then measurement precision is improved, but operation rate is limited and productivity decreases
Solution Approach 1:
The patent extracts only the essential characteristic (power or amplitude difference) needed for synchronization, eliminating the need to process the entire long correlation sequence. This extraction approach enables high operation rates while maintaining synchronization accuracy, as only the critical feature detection is required rather than full sequence correlation.
Solution Approach 2:
The patent skips the complex correlation operation steps and directly detects the power or amplitude characteristics of training symbols. This rushing through the unnecessary computational steps allows the system to operate at high rates while still achieving accurate synchronization, effectively bypassing the bottleneck of long sequence correlation processing.
3Productivity
If correlation operation is performed within a single symbol for high-rate communication, then productivity is improved, but error probability of wave crest detection increases and measurement precision deteriorates
Solution Approach 1:
The patent changes the detection parameter from wave crest detection of correlation values to power or amplitude difference detection of training symbols. This parameter change enables accurate detection within single symbols at high rates, as power/amplitude measurements are more robust and faster to compute than wave crest detection, eliminating the trade-off between speed and precision.
4Measurement precision
If a local correlation sequence is stored and used for correlation operation, then measurement precision is improved, but storage space requirement increases
Solution Approach 1:
The patent extracts only the essential information needed for synchronization from the training symbol, eliminating the need to store and process long local correlation sequences. By using only the power or amplitude characteristics of training symbols, the system achieves accurate synchronization with minimal storage requirements, as no long sequences need to be stored for correlation operations.
Data Source
AI summary
Embodiments of the present disclosure provide a sequence synchronization apparatus and method and a receiver. The sequence synchronization apparatus includes: a signal receiving unit configured to receive a clock synchronized signal including a training symbol, the training symbol being in-phase modulated or being modulated with a fixed phase difference based on all or part of subcarriers; and a symbol detecting unit configured to detect the training symbol, so as to achieve sequence synchronization of the signal. With the embodiments of the present disclosure, not only sequence synchronization may be achieved by using minimum complexity as possible, but also the sequence synchronization apparatus is made simple, fast and accurate.