Pulse-Modulated UWB Chaotic Signal Generation for Multi-Channel Access
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Solution Overview
Problem
Conventional chaotic signal generators for ultra wideband (UWB) communications cannot enable multiple users to transmit and receive radio signals simultaneously within a specific wireless communication range due to interference from using the same channel, as they generate a single signal across the entire UWB frequency band.
Innovation Solution
An adjustable chaotic signal generator using pulse modulation for UWB communications, which includes multiple pulse generators, combiners, local oscillators, and a power combiner to split the chaotic signal into multiple frequency bands, allowing for simultaneous communication by users through multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single chaotic signal is generated across the entire UWB frequency band, then the hardware structure is simplified and power consumption is reduced, but multiple users cannot communicate simultaneously due to channel interference
Solution Approach 1:
The single chaotic signal is segmented into multiple frequency bands using pulse generators with different frequencies and combiners, creating multiple channels that enable simultaneous multi-user communication while maintaining the underlying chaotic signal structure
Solution Approach 2:
The patent transitions from a single-dimensional chaotic signal to a multi-dimensional signal structure by introducing frequency division through multiple pulse generators, adding the frequency dimension to enable channel separation without complicating the core chaotic generation mechanism
2Adaptability or versatility
If a single chaotic signal is generated across the entire UWB frequency band, then power consumption is reduced to 10 mW, but frequency division multiplexing becomes infeasible
Solution Approach 1:
The UWB frequency band is segmented into multiple channels using pulse generators operating at different frequencies, enabling frequency division multiplexing while maintaining low power consumption by avoiding complex RF hardware such as VCOs, PLL circuits, and mixers
3Adaptability or versatility
If multiple pulse generators with different frequencies are used to create multiple channels, then multi-user communication is enabled, but the device complexity increases
Solution Approach 1:
Multiple pulse generators with different frequencies are merged through combiners to create a unified multi-channel chaotic signal, reducing overall system complexity by integrating multiple functions into a single signal path rather than requiring separate transmission paths for each channel
Data Source
AI summary
An adjustable chaotic signal generator using pulse modulation for UWB communications, and a chaotic signal generating method thereof are provided. The chaotic signal generator for UWB communications includes a plurality of pulse generators which generates pulses of different frequencies; at least one combiner which combines the pulses generated at the pulse generators; and a plurality of local oscillators which receives signals from the combiner, respectively, and generates a chaotic signal by increasing the received signals to different frequency bands. Accordingly, a plurality of users can conduct the radio communications in a specific wireless communication range at the same time by generating the chaotic signal that can be split to the multiple channels. Also, the chaotic signal generator is structured using devices integratable on an integrated circuit.