Impulse Wireless Communication Hybrid Modulation Speed
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Solution Overview
Problem
Existing pulse position modulation (PPM) schemes in ultra-wideband (UWB) communication systems face limitations in increasing transmission speed due to the time required for data transmission, which restricts the overall wireless communication speed.
Innovation Solution
An impulse wireless communication system that combines different modulation schemes, including oscillation signal generators, envelope signal generators, and synthesizers to create and process impulse signals, allowing for enhanced data transmission by determining phases and amplitudes of modulation envelope signals, thereby increasing transmission speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If pulse position modulation (PPM) scheme is used for wireless communication, then communication speed can be increased, but the time necessary for transmission increases as the amount of data increases, limiting further speed improvement
Solution Approach 1:
The patent combines multiple modulation schemes (PPM, PAM, OOK) into a hybrid modulation system. The signal generator simultaneously generates multiple pulse signals with different characteristics (positions, amplitudes, presence/absence) to encode data, allowing parallel transmission of multiple data bits in a single transmission interval, thereby increasing communication speed while reducing transmission time
Solution Approach 2:
The patent extends the traditional one-dimensional PPM approach by adding amplitude and presence/absence dimensions to pulse encoding. Instead of only varying pulse position, the system varies pulse amplitude and presence simultaneously, creating a multi-dimensional encoding space that increases data capacity per transmission interval without proportionally increasing transmission time
2Device complexity
If traditional PPM scheme is used, then simple modulation is achieved, but transmission speed cannot be increased further due to time constraints
Solution Approach 1:
The patent divides the data transmission process into multiple parallel channels by generating multiple pulse signals simultaneously with different characteristics. Each pulse signal carries a portion of the data, and the receiver processes these parallel signals to reconstruct the complete data stream, thereby increasing data transmission efficiency while maintaining manageable system complexity through modular processing
Solution Approach 2:
The patent changes multiple signal parameters simultaneously (pulse position, amplitude, and presence/absence) to encode data, rather than relying on a single parameter as in traditional PPM. This multi-parameter encoding approach increases the information capacity of each transmission interval, improving data transmission efficiency without requiring proportionally more complex modulation schemes
Data Source
AI summary
An impulse wireless communication system includes an oscillation signal generator that generates a plurality of oscillation signals having a delay interval with each other and having the same phase and amplitude or different phases and amplitudes, an envelope signal generator that extracts a sync signal and a data signal making up communication signal data and generates an envelope signal for the sync signal and an envelope signal for the data signal, a signal synthesizer that synthesizes the plurality of oscillation signals with the envelope signals, an envelope signal extractor that extracts a plurality of modulation envelope signals from the impulse signal, an amplitude phase determiner that determines the phase and the amplitude in the plurality of modulation envelope signals based on the plurality of oscillation signals, and a calculator that extracts the envelope signals from the plurality of modulation envelope signals based on the phase and the amplitude.