Coherent Chaos Communication TDMA Throughput
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Solution Overview
Problem
Current chaotic communication systems face limitations in throughput due to analog chaos generator circuits that drift over time, requiring constant synchronization and resulting in low data rates and reduced flexibility in time division multiple access (TDMA) protocols, while non-coherent systems suffer from reduced throughput and error rates.
Innovation Solution
The implementation of a coherent chaos-based communication system using discrete-time modulation processes and chaotic spreading codes generated with varying parameters, allowing for selective access control through time division multiplexing and spread spectrum formats, enabling higher throughput and flexibility in TDMA protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog chaos generator circuits are used to generate chaotic signals, then chaotic waveforms with impulsive autocorrelation and compact power spectrum are achieved, but the circuits drift over time requiring constant synchronization which reduces throughput
Solution Approach 1:
The patent replaces analog chaos generator circuits with digital chaos generator circuits. The digital implementation uses discrete-time modulation processes and digital signal processing to generate chaotic spreading codes, eliminating the drift problem inherent in analog circuits while maintaining the desirable spectral properties of chaotic signals.
Solution Approach 2:
The patent changes the operational parameters of the chaos generator from continuous analog domain to discrete digital domain. By using discrete-time modulation with varying parameters (such as phase shifts, frequency deviations, and spreading code sequences), the system achieves synchronization without constant state information exchange, thereby improving throughput.
2Measurement precision
If constant state information exchange is implemented to maintain synchronization in chaotic systems, then synchronization accuracy is improved, but data transmission rates are reduced
Solution Approach 1:
The digital chaos generator system is designed to self-synchronize through the inherent properties of discrete-time chaotic sequences. The receiver can independently regenerate the same chaotic spreading codes using the same digital algorithm and initial conditions, eliminating the need for constant state information exchange while maintaining synchronization accuracy.
Solution Approach 2:
The system performs preliminary synchronization during initial connection establishment by exchanging synchronization information only at that point. After synchronization is achieved, the system maintains it autonomously without requiring continuous state information exchange, thereby maximizing data transmission rates.
3Reliability
If analog chaos generator circuits are used, then chaotic signal generation is achieved, but flexibility in TDMA protocols is reduced due to drift requirements
Solution Approach 1:
The patent implements dynamic parameter adjustment in the digital chaos generator, allowing the system to adapt to different TDMA protocol requirements. The digital implementation enables flexible modification of spreading code sequences, modulation parameters, and timing structures without being constrained by drift characteristics, thereby enhancing TDMA protocol flexibility.
Data Source
AI summary
Systems (100) and methods for selectively controlling access to data streams communicated from a first communication device (FCD) using a timeslotted shared frequency spectrum and shared spreading codes. Protected data signals (1301, . . . , 130S) are modulated to form first modulated signals (1321, . . . , 132S). The first modulated signals are combined with first chaotic spreading codes to form digital chaotic signals. The digital chaotic signals are additively combined to form a protected data communication signal (PDCS). The PDCS (136) and a global data communication signal (GDCS) are time division multiplexed to form an output communication signal (OCS). The OCS (140) is transmitted from FCD (102) to a second communication device (SCD) over a communications channel. The SCD (106, 108, 110) is configured to recover (a) only global data from the OCS, or (b) global data and at least some protected data from the OCS.