Synchronous Acquisition Circuit Timing Correction for Noise
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Solution Overview
Problem
Existing synchronous acquisition circuits in spread spectrum communication systems are prone to improper demodulation due to noise-induced false detection of the preamble symbol, leading to reduced receiver sensitivity and incorrect timing control signals.
Innovation Solution
A synchronous acquisition circuit with a timing correction circuit that generates a corrected timing control signal based on the demodulation signal, ensuring accurate synchronization and reducing the likelihood of improper demodulation by adjusting the timing control signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection circuit generates a detection signal based on correlation signal exceeding a predetermined threshold, then the circuit can detect preamble symbols, but noise may cause false detection leading to improper synchronous acquisition
Solution Approach 1:
The timing correction circuit uses feedback from the demodulation signal to verify whether the detected preamble symbol is correct. The correction signal is generated based on the demodulation signal and fed back to adjust the timing control signal, ensuring that false detections caused by noise are corrected and reliable synchronous acquisition is achieved.
Solution Approach 2:
The timing correction circuit acts as an intermediary between the detection circuit and the timing control circuit. It receives the detection signal and timing control signal, processes them through the correction signal generation based on demodulation signals, and outputs a corrected timing control signal, thereby mediating to eliminate noise-induced false detections.
2Productivity
If the timing control circuit generates timing control signals based on detection signals, then demodulation can be performed, but improper timing control signals may be generated due to false detection
Solution Approach 1:
The timing correction circuit implements feedback by using the demodulation signal to verify the correctness of the timing control signal. When false detection occurs, the feedback mechanism generates a correction signal that adjusts the timing control signal, ensuring both fast demodulation and high accuracy.
Solution Approach 2:
The timing correction circuit performs preliminary correction on the timing control signal before it is used for demodulation. By generating the correction signal in advance based on the demodulation signal and detection signal, the system ensures that the timing control signal is accurate before demodulation proceeds, preventing improper demodulation results.
3Device complexity
If the system operates without timing correction, then the circuit complexity is reduced, but improper synchronous acquisition occurs due to noise
Solution Approach 1:
The timing correction circuit serves as an intermediary component that connects the detection circuit and timing control circuit. It adds minimal complexity by processing the detection signal and demodulation signal to generate a correction signal, which then adjusts the timing control signal to eliminate false detections and improve synchronous acquisition reliability.
Solution Approach 2:
The timing correction circuit changes the parameter of the timing control signal by generating a correction signal that adjusts its timing. This parameter change ensures that the timing control signal accurately corresponds to the preamble symbol even in the presence of noise, improving synchronous acquisition reliability without significantly increasing circuit complexity.
Data Source
AI summary
In a synchronous acquisition method of a spread spectrum code, a digital code sequence is generated based on a received radio communication signal. The digital code sequence defines a spread spectrum code which includes a preamble symbol. A plurality of correlation signals are generated based on the spread spectrum code of the digital code sequence. A detection signal is generated in accordance with the correlation signal which corresponds to the preamble symbol. A timing control signal is generated in accordance with the detection signal. A demodulation signal is generated based on the correlation signals and in accordance with the timing control signal. A correction signal is generated based on the demodulation signal. A corrected timing control signal is generated based on the timing control signal and the correction signal, such that the demodulation signal corresponds to the preamble symbol.