Wireless Transmitter Delay-Doppler Multiplexing for Mixed Waveforms
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Solution Overview
Problem
Efficient multiplexing of signals using different waveforms in a wireless communication system is challenging due to incompatibilities and interference issues.
Innovation Solution
A transmitter is designed to perform sparse resource mapping and power shaping in the delay-Doppler domain, followed by inverse symplectic finite Fourier transform (ISFFT), enabling non-orthogonal multiplexing of signals with different waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signals using different waveforms are multiplexed in a wireless communication system, then spectral efficiency is improved, but interference between signals increases
Solution Approach 1:
The patent applies local quality by performing power shaping in the delay-Doppler domain, where different power levels are assigned to different delay-Doppler resources. This allows the signal to have different local characteristics in different regions of the delay-Doppler domain, enabling efficient multiplexing while controlling interference through localized power adjustment rather than uniform treatment across the entire signal.
Solution Approach 2:
The patent changes parameters by transforming the signal from the time-frequency domain to the delay-Doppler domain using ISFFT, and applying power shaping in this transformed domain. This parameter transformation allows for more effective resource allocation and interference management by operating in a domain where the signal characteristics are better suited for handling high mobility and Doppler effects.
2Ease of operation
If conventional waveforms are used for compatibility, then ease of operation is maintained, but adaptability to high mobility environments deteriorates
Solution Approach 1:
The patent achieves universality by designing a transmitter that can handle both conventional and advanced waveform requirements through a unified delay-Doppler domain processing framework. The ISFFT-based power shaping mechanism provides a universal solution that works for high mobility scenarios while maintaining compatibility with existing communication systems, allowing the same processing structure to serve multiple functions and different operational requirements.
Data Source
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AI summary
A transmitter includes a control unit configured to convert a first signal into a time-frequency domain by performing sparse resource mapping and power shaping on the first signal in a delay-Doppler domain and performing an inverse symplectic finite Fourier transform (ISFFT); and a transmission unit configured to non-orthogonally multiplex the first signal with a second signal and transmit the multiplexed signal.