Dual-Frequency Smoothing Amplitude Modulation for Spectrum Efficiency
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Solution Overview
Problem
Existing data transmission methods face challenges in achieving high transmission efficiency and low bit error rates due to the extension of frequency spectrum bandwidth by high-order discrete line spectrum components, leading to scarce radio frequency spectrum resources.
Innovation Solution
The method involves calculating modulation signal waveforms using a Lagrangian function to maximize the Euclidean distance between digital signal modulated waveforms, resulting in dual-frequency smoothing amplitude-modulated waveforms with sine-like characteristics, which concentrate frequency spectrum utilization on the carrier frequency, eliminating high-order harmonic line spectrum components and reducing frequency bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional modulation signal waveforms are used, then data transmission can be performed, but the high-order discrete line spectrum extends the frequency spectrum bandwidth, reducing spectrum utilization efficiency
Solution Approach 1:
The patent changes the waveform parameters by introducing dual-frequency smoothing amplitude modulation, transforming the signal from traditional single-frequency modulation to dual-frequency modulation with smoothing characteristics. This parameter change eliminates high-order discrete line spectrum components while maintaining signal detection capability, thereby reducing bandwidth occupation and improving spectrum utilization efficiency
Solution Approach 2:
The patent combines two different frequency components to form a composite modulation signal. By superimposing two frequency components with appropriate amplitude and phase relationships, the signal achieves both good detection performance and reduced bandwidth occupation, as the composite waveform cancels out harmful high-order harmonics
2Measurement precision
If the Euclidean distance between modulation waveforms is increased to improve signal detection capability, then bit error rate decreases, but frequency spectrum bandwidth may be extended
Solution Approach 1:
The patent optimizes waveform parameters by maximizing the Euclidean distance between modulation waveforms through dual-frequency smoothing amplitude modulation. The mathematical optimization ensures that the distance between different signal waveforms is maximized for better detection, while the dual-frequency smoothing structure simultaneously constrains the bandwidth by eliminating high-order harmonics
3Productivity
If high-order harmonic line spectrum components are present, then signal bandwidth is extended, but spectrum resource utilization is reduced
Solution Approach 1:
The patent converts the potentially harmful high-order harmonic components into beneficial dual-frequency components. By deliberately introducing two frequency components with controlled relationships, the signal achieves better detection performance while the smoothing amplitude modulation eliminates the harmful high-order harmonics, turning what would be bandwidth-extending elements into bandwidth-efficient carriers
Data Source
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AI summary
Introduced are a data transmission method, apparatus and device based on a modulation signal and a storage medium. The method includes steps as follows: calculating a first amplitude-modulated sine wave signal and a second amplitude-modulated sine wave signal of each preset frequency; based on the first amplitude-modulated sine wave signal and the second amplitude-modulated sine wave signal of the each preset frequency and according to a preset mapping rule, mapping a sequence of data bits to be sent into a signal sequence; and processing the signal sequence to generate a transmittable radio-frequency signal, and sending the transmittable radio-frequency signal to a receiving end.