Transpositional Modulation Signal Multiplexing
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Solution Overview
Problem
Traditional carrier modulation techniques are limited in their ability to efficiently combine and transmit multiple data signals on a single carrier frequency without increasing bandwidth or interfering with traditional modulation signals.
Innovation Solution
The use of transpositional modulation (TM) techniques, which generate TM signals by shifting modulation signals to sidebands within the frequency spectrum of a non-TM signal, allowing for the combination of TM and non-TM signals on a common carrier without increasing bandwidth, and enabling independent demodulation of TM signals by traditional receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional carrier modulation techniques are used to transmit multiple data signals, then bandwidth is occupied by each signal, but spectral efficiency decreases and bandwidth expansion occurs
Solution Approach 1:
The patent combines multiple modulated signals (TM and non-TM) onto a single carrier frequency by positioning them in different spectral regions (upper and lower sidebands). This merging approach allows simultaneous transmission of multiple data streams without requiring separate bandwidth allocations, thereby increasing spectral efficiency while maintaining data throughput.
2Productivity
If multiple signals are combined on a single carrier frequency, then data throughput increases, but signal interference occurs
Solution Approach 1:
The patent segments the frequency spectrum into distinct regions by positioning the TM signal in the upper sideband and the non-TM signal in the lower sideband of the carrier frequency. This spectral segmentation creates isolation between signals, preventing interference while enabling simultaneous transmission and maintaining high data throughput.
3Adaptability or versatility
If traditional modulation techniques are used, then compatibility with existing systems is maintained, but ability to transmit multiple signals efficiently is limited
Solution Approach 1:
The patent introduces transpositional modulation (TM) as an intermediary technique that bridges traditional and advanced modulation approaches. TM signals can be superimposed on conventional modulated carriers, enabling enhanced multi-signal transmission capability while maintaining compatibility with existing systems. The added complexity is localized to the TM signal generation and detection, leaving traditional modulation paths intact.
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for modulating and demodulating transpositional modulated (TM) signals. One aspect features a method of modulating a carrier signal that includes the operations of generating a non-transpositional modulation (non-TM) signal from a first data signal, where the non-TM signal has a frequency spectrum that occupies a bandwidth. Generating a TM signal by generating a modulation from a second data signal, and shifting the modulation signal in frequency to an upper or lower sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth of the non-TM signal, and where the power of the first modulated signal is less than a power of the non-TM signal. Combining the non-TM signal with the TM signal on a common carrier signal to provide a combined signal. Transmitting the combined signal.