Phase Separated DCSK Signal Processing for Complex Channel Noise
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Solution Overview
Problem
Existing communication solutions for complex channels like short-wave or underwater communication struggle to achieve high communication rates and low bit error rates (BER) while being compatible with existing devices, particularly in non-coherent chaos communication systems.
Innovation Solution
A communication method for phase separation differential chaos shift keying (DCSK) based on a second-order hybrid system (SONS) is introduced, which generates chaotic signals using a specific mathematical model and performs chaotic matched filtering to demodulate signals, allowing for higher communication rates and lower BER without requiring synchronization or channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional DCSK modulation is used to increase communication rates, then communication rate improves, but bit error rate increases in complex channels
Solution Approach 1:
The patent segments the chaotic signal transmission into two orthogonal components: in-phase component (multiplying by cos(2πfct)) and quadrature component (multiplying by sin(2πfct)). This segmentation allows independent processing and transmission of reference and data signals, enabling higher communication rates while maintaining low bit error rates through orthogonal separation that reduces interference in complex channels
Solution Approach 2:
The patent transitions from traditional single-dimensional DCSK modulation to two-dimensional phase-separated modulation by introducing both in-phase and quadrature components. This dimensional expansion allows simultaneous transmission of multiple signal components, doubling the communication rate while the orthogonal nature of the dimensions provides inherent noise immunity and maintains reliability in complex communication environments
2Reliability
If coherent chaos communication is used to achieve low BER, then bit error rate improves, but device complexity increases due to synchronization requirements
Solution Approach 1:
The patent implements self-service by embedding the reference signal within the transmitted signal itself through the in-phase component, allowing the receiver to extract and use the reference signal directly from the received composite signal without requiring external synchronization sources. This self-contained approach maintains low bit error rates while eliminating complex synchronization mechanisms
Solution Approach 2:
Instead of requiring the receiver to synchronize with the transmitter's chaotic oscillator (traditional approach), the patent inverts the approach by having the transmitter send both reference and data components that the receiver can process independently. This inversion eliminates the need for chaotic oscillator synchronization while maintaining reliable communication through the orthogonal phase-separated structure
3Device complexity
If non-coherent chaos communication is used to reduce device complexity, then device complexity decreases, but communication rate is reduced due to reference signal transmission
Solution Approach 1:
The patent merges the reference signal transmission and data signal transmission into a single composite signal by combining the in-phase reference component and the quadrature data component. This merging allows both reference and data to be transmitted simultaneously in orthogonal phases, doubling the communication rate while maintaining the simplicity of non-coherent detection without requiring separate transmission periods
Solution Approach 2:
The patent ensures continuous useful action by transmitting both reference and data components continuously in parallel through orthogonal phase separation, rather than alternating between reference-only and data-only periods. This continuous parallel transmission eliminates idle reference transmission periods, maximizing the utilization of the communication channel and doubling the effective communication rate while maintaining device simplicity
Data Source
AI summary
A communication method for phase separation differential chaos shift keying (DCSK) based on a second order hybrid system (SOHS) is provided. The method includes the following steps. At Step 1: communication system parameters are set. At Step 2: binary information to be transmitted are prepared. At Step 3: the chaotic signal u(t) is generated. At Step 4: the chaotic signal is prepared to be transmitted. At Step 5: a received signal is demodulated. At Step 6: a chaotic matched filtering operation is performed on the demodulated reference signal and the demodulated information bearing signal. At Step 7: optimal signal to noise ratio (SNR) points are extracted in a sampling way. At Step 8: polarity of each symbol is determined to obtain a recovered signal.