Signal Processing Method for Accurate Symbol Rate Determination
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Solution Overview
Problem
In communication systems such as wireless communication, radar, IoT, and satellite systems, accurately determining the symbol rate of signals with a small number of symbols and low signal-to-noise ratio is challenging due to interference and noise.
Innovation Solution
A signal processing method that involves receiving a signal, processing it to obtain a squared complex envelope, and then using a filter with a cutoff frequency determined by the average-to-peak power ratio of the signal's spectrum to accurately determine the symbol rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional signal processing methods are used to determine symbol rate, then the method is simple, but the determination accuracy is poor when the number of symbols is small and signal-to-noise ratio is low
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between average-to-peak power ratios and symbol rates in a lookup table before actual signal processing. When a signal is received, the system only needs to calculate the average-to-peak power ratio and query the pre-stored table, avoiding complex real-time calculations. This prepares the processing path in advance, enabling fast and accurate symbol rate determination even with limited symbols and low signal-to-noise ratio.
Solution Approach 2:
The patent introduces the average-to-peak power ratio as an intermediary parameter that bridges the received signal and the symbol rate determination. Instead of directly analyzing the complex signal to determine symbol rate, the system first calculates the average-to-peak power ratio, which serves as a simplified intermediate representation that correlates with symbol rate through pre-stored relationships. This intermediary approach simplifies the determination process while maintaining accuracy.
2Measurement precision
If more symbols are collected to improve symbol rate determination accuracy, then the accuracy improves, but the time consumption increases
Solution Approach 1:
The patent pre-calculates the relationship between average-to-peak power ratios and symbol rates for various signal conditions and stores these relationships in a lookup table. This preliminary preparation allows the system to determine symbol rate by simply querying the table with a pre-calculated ratio, rather than performing time-consuming analysis on large numbers of symbols. The processing time is significantly reduced while maintaining accuracy.
Solution Approach 2:
The patent transforms the symbol rate determination problem from direct signal analysis to parameter-based lookup. By changing the approach from analyzing signal waveforms to calculating and querying the average-to-peak power ratio parameter, the system achieves fast determination without needing to process large numbers of symbols. The parameter transformation enables accurate determination with minimal symbols and processing time.
Data Source
AI summary
A signal processing method and device are disclosed. The method include: receiving a first signal; processing the first signal to obtain a squared complex envelope of the first signal; obtaining a second signal by processing the squared complex envelope of the first signal using a first filter, where a cutoff frequency of the first filter is determined according to an average-to-peak power ratio of a squared complex envelope spectrum of a third signal, the third signal is obtained by processing the first signal using a second filter, and a cutoff frequency of the second filter is determined according to a bandwidth occupied by the first signal; determining a squared complex envelope spectrum of the second signal; and determining a symbol rate corresponding to the first signal according to the squared complex envelope spectrum of the second signal. As such, the symbol rate of the signal can be determined accurately.