Chaotic Signal Generation for Spread Spectrum Communication
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Solution Overview
Problem
Current spread-spectrum communication methods lack effective means to generate chaotic signals within specific frequency bands and efficiently modulate and demodulate information using chaotic dynamic systems, particularly in microwave communications, while also failing to restrict power spectral density.
Innovation Solution
A method for direct chaotic communication systems where a chaotic dynamic system is synthesized to generate a wide-band information carrier within a predetermined frequency band, modulated by information signals using chaotic RF or optical pulses, and demodulated using a matched dynamic system, ensuring the spectral characteristics conform to a predetermined spectral mask.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a narrow-band periodic carrier is used for information transmission, then the transmission is simpler and more conventional, but the frequency band utilization is inefficient and interference immunity is reduced
Solution Approach 1:
The patent transforms the carrier signal from a narrow-band periodic waveform to a wide-band chaotic signal by changing the fundamental parameter of the signal generation mechanism. This parameter change enables the system to achieve superior interference immunity and spectral efficiency while maintaining practical implementation through controlled chaotic dynamics.
2Adaptability or versatility
If a wide-band chaotic carrier is generated directly within the information transmission frequency band, then spectral efficiency and interference immunity are improved, but the generation and control of chaotic signals within specific frequency bands becomes complex
Solution Approach 1:
The patent applies preliminary action by synthesizing the chaotic dynamic system structure in advance according to predetermined spectral characteristics. The system pre-identifies regions of parameters that provide similar chaotic behavior, then selects specific parameter values to generate carriers with required spectral masks, thereby simplifying real-time implementation.
Solution Approach 2:
The patent utilizes parameter changes by identifying regions of parameters in the chaotic dynamic system that produce similar chaotic behavior, then selecting specific parameter values within these regions to achieve desired spectral characteristics. This allows flexible control of the chaotic carrier's frequency band and spectral density.
3Reliability
If chaotic signals are used as information carriers, then communication reliability and spectral efficiency are enhanced, but effective methods for modulation and demodulation while restricting power spectral density are lacking
Solution Approach 1:
The patent employs feedback mechanisms in the chaotic dynamic system to control and stabilize the chaotic oscillations within specific frequency bands. The feedback loop allows the system to maintain desired spectral characteristics while enabling effective modulation and demodulation operations.
Data Source
AI summary
Spread spectrum transmission of information is performed using chaotic signals. Direct chaotic communication systems in which information is input to chaotic signal generated directly in information transmission frequency band, are achieved by forming broadband information carrier necessary for transmission and using a chaotic dynamic system whose structure is synthesized in advance in accordance with predetermined characteristics of broadband information carrier to cause chaotic dynamic system to provide operation of forming the broadband information carrier in form of a chaotic information carrier having prescribed spectral characteristics. Modulating the chaotic information carrier is carried out by forming chaotic radio or optic chaotic pulses from chaotic information carrier, with predetermined time intervals between pulses in accordance with the transmitted information signal, and the reception and demodulation at the receiving side is carried out using a dynamic system matched, in behavior, with chaotic dynamic system of transmitting side.