Signal Generation Device Phase Rotation Orthogonality
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Solution Overview
Problem
Existing signal generation methods in communication systems struggle to induce diverse characteristics of second-order cyclostationarity with minimal overhead while maintaining orthogonality between subcarriers, particularly when using inverse Fourier transform, leading to limited information transmission and potential demodulation performance deterioration.
Innovation Solution
A signal generation device and method that employs a modulation unit, serial-parallel conversion, duplication, phase rotation, and inverse Fourier transform units to generate signals with diverse second-order cyclostationarity characteristics by rotating the phase of symbols and duplicating data, ensuring orthogonality and reducing overhead through controlled phase rotation and subcarrier disposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal generation methods duplicate transmission data to induce cyclostationarity, then second-order cyclostationarity characteristics are improved, but orthogonality between subcarriers deteriorates
Solution Approach 1:
The invention divides the transmission data into multiple segments and assigns different phase rotation rates to different segments. This segmentation allows each segment to maintain orthogonality while collectively inducing diverse cyclostationarity characteristics through the phase rotation differences.
Solution Approach 2:
The invention applies different phase rotation rates to different segments of transmission data, creating local variations in signal characteristics. This local quality differentiation enables the system to maintain orthogonality in each segment while generating diverse cyclostationarity characteristics across the overall signal.
2Productivity
If phase rotation is applied to induce diverse cyclostationarity characteristics, then information transmission capability is improved, but overhead increases
Solution Approach 1:
The invention applies phase rotation only to a portion of the transmission data (specifically, only to segments that need to convey additional information), rather than applying it to all data uniformly. This partial action approach enables the system to induce diverse cyclostationarity characteristics for information transmission while minimizing the overhead introduced by phase rotation.
3Adaptability or versatility
If duplicate transmission signals are sent at different frequencies, then cyclostationarity is improved, but demodulation performance deteriorates
Solution Approach 1:
The invention applies phase rotation to segments of transmission data before the inverse Fourier transform is performed. This preliminary action ensures that the phase differences are established in the frequency domain, allowing the system to maintain orthogonality and prevent interference between duplicate signals during demodulation while still inducing the desired cyclostationarity characteristics.
Data Source
AI summary
A signal generation device that employs a transmission method that uses inverse Fourier transform includes: a modulation unit configured to modulate transmission data to obtain modulation data; a serial-parallel conversion unit configured to convert the modulation data input in series to parallel data of a prescribed size smaller than the size of inverse Fourier transform; a duplication unit configured to select and duplicate all or a portion of the parallel data, to obtain duplication data; a phase rotation unit configured to rotate the phase of a signal point at a prescribed rate for the duplication data, to obtain phase rotation data; and an inverse Fourier transform unit configured to carry out inverse Fourier transform on the parallel data obtained from the serial-parallel conversion unit and the phase rotation data obtained from the phase rotation unit.