Transpositional Modulation Signal Separation for Bandwidth Efficiency
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Solution Overview
Problem
Existing communication systems face challenges in identifying transpositional modulation (TM) capable devices and efficiently combining TM signals with traditional modulation schemes on the same carrier signal, leading to limited bandwidth and interference issues.
Innovation Solution
The method involves transmitting a carrier signal modulated with a TM signal and a non-TM modulation signal, allowing TM capable devices to respond with a TM signal, and using a separation and extraction process to remove non-TM signals, enabling TM signal extraction and combination without interfering with traditional modulation schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional modulation schemes (AM, FM, PM, QAM) are used for signal transmission, then compatibility with existing communication systems is maintained, but bandwidth efficiency is limited and no device identification capability is provided
Solution Approach 1:
The patent combines traditional modulation schemes with transpositional modulation on the same carrier signal. The transmission signal includes both a non-TM modulation signal (for compatibility with existing systems) and a TM signal (for enhanced bandwidth efficiency and device identification), allowing both functions to coexist without interference
Solution Approach 2:
The carrier signal is designed to serve multiple functions simultaneously: it carries traditional modulation signals for compatibility with legacy systems, TM signals for improved bandwidth efficiency, and device identification information through the TM component. This multi-functionality resolves the contradiction by making the same transmission medium serve both old and new purposes
2Productivity
If TM signals are transmitted on the same carrier as traditional modulation signals, then bandwidth efficiency increases, but signal interference and separation difficulty arise
Solution Approach 1:
The patent segments the modulation process into distinct components: traditional modulation (AM, FM, PM, QAM) and transpositional modulation. Each modulation type operates on the carrier signal independently with its own characteristics, allowing them to be separated at the receiver through their distinct modulation properties without requiring complex interference management
Solution Approach 2:
The patent uses the distinct characteristics of TM signals as an intermediary mechanism for separation. The TM signal's unique transpositional properties serve as a marker that allows receivers to identify and separate TM components from traditional modulation components, simplifying the overall signal processing despite the presence of multiple modulation types
3Adaptability or versatility
If device identification using TM signals is implemented, then device discovery capability is enhanced, but detection and measurement difficulty increases
Solution Approach 1:
The patent uses the transpositional modulation's frequency-shifting property as a distinctive 'signal color' or marker. The TM signal shifts the carrier frequency by a characteristic amount, creating a detectable signature that enables easy device identification. This frequency 'color change' makes the TM signal readily distinguishable from traditional modulation signals, enhancing device discovery while simplifying detection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for efficient device identification, increased bandwidth, and seamless coexistence of TM and traditional modulation signals, enabling TM signal extraction and communication without affecting existing modulation systems.
Implementation Method 1
determining whether the response signal includes the TM signal includes mixing the response signal with a second harmonic of a carrier signal of the response signal to produce a mixed signal
Implementation Method 2
generating a second harmonic signal and a third harmonic signal of the carrier signal
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for transmitting, by a first device, a transmission signal that includes a carrier signal modulated with a TM signal. Receiving a response signal from a second device in response to the transmission signal. Determining, whether the response signal includes the TM signal.