Constellation Modulation Filtering for Phase Noise and Low PAPR
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Solution Overview
Problem
In high-frequency communication scenarios, existing technologies face challenges in accurately estimating phase noise and maintaining low peak average power ratio (PAPR) due to high phase noise, large Doppler shift, and large path loss, which affect signal-to-noise ratio and power amplifier efficiency.
Innovation Solution
A data modulation method using constellation point modulation symbols with a preset phase difference and filtering operations to suppress phase noise and reduce PAPR, involving modulation and filtering of data sequences to enhance data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional modulation methods are used in high-frequency scenarios, then data transmission can be performed, but phase noise estimation accuracy deteriorates and peak average power ratio increases
Solution Approach 1:
The patent changes the modulation parameters by introducing two groups of modulation symbols with a preset phase difference (e.g., 90 degrees) and using these modified symbols for data modulation. This parameter change enables better phase noise estimation and suppression in high-frequency scenarios while maintaining data transmission capability.
2Length of moving object
If high power transmission is used to overcome path loss, then communication range extends, but peak average power ratio increases and power amplifier efficiency deteriorates
Solution Approach 1:
The patent modifies the power characteristics of the transmitted signal by using modulation symbols with specific power levels and phase relationships. The two groups of modulation symbols have different power characteristics that when combined through the prescribed modulation method, result in lower peak average power ratio while maintaining sufficient transmission power for long-range communication.
3Stability of the object's composition
If signal power is increased to compensate for Doppler shift, then frequency stability improves, but peak average power ratio increases
Solution Approach 1:
The patent introduces phase variations between the two groups of modulation symbols that help compensate for Doppler-induced frequency shifts. The preset phase difference and the specific modulation pattern enable frequency stability improvement without requiring excessive signal power, thus controlling the peak average power ratio.
Data Source
AI summary
Provided in the embodiments of the present application are a data modulation method, a data modulation apparatus, a computer-readable storage medium and a computer program product. The method comprises: modulating a data sequence by using N constellation point modulation symbols {S(n)}, so as to obtain K modulated data symbols [x(k)], wherein the N constellation point modulation symbols comprise two groups of modulation symbols, the phase difference between the two groups of modulation symbols being a preset angle, and N is an even number greater than or equal to 4, n is any integer from 0 to N−1, K represents the number of modulated data symbols, K is an integer, and k is any integer from 0 to K−1; performing a filtering operation on the modulated data symbols, so as to obtain filtered data; and transmitting the filtered data on a physical resource.