Pointwise Frequency-Domain Multiplication for Low-PAPR Transmission
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Solution Overview
Problem
High-frequency bands in 5G mobile communication experience significant path loss and shadow fading, leading to low signal-to-noise ratios (SNR) and high peak-to-average power ratio (PAPR) in user equipment (UE), which is exacerbated by non-orthogonal user access, necessitating a low-order modulation and coding scheme with a low PAPR to improve efficiency and conserve battery power, especially in mMTC scenarios.
Innovation Solution
A data transmission method involving pointwise multiplication of frequency-domain data sequences followed by an inverse Fourier transform to generate a data sequence that is transmitted on a physical time-frequency resource, utilizing root-raised cosine functions to optimize data correlation and reduce PAPR without increasing bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency bands are used for eMBB and URLLC services, then data transmission rate and service quality are improved, but path loss and shadow fading increase causing low SNR
Solution Approach 1:
The patent changes the modulation parameter from conventional QAM to a new modulation scheme based on inverse Fourier transform of frequency-domain data sequences, which achieves lower PAPR and improved SNR while maintaining high data transmission rates in high-frequency bands
2Productivity
If conventional modulation schemes are used, then demodulation efficiency is maintained, but PAPR remains high causing power amplifier inefficiency
Solution Approach 1:
The patent changes the modulation parameter from conventional QAM to a new modulation scheme where the modulated signal is obtained by inverse Fourier transform of frequency-domain data sequences, achieving lower PAPR and improved power amplifier efficiency while maintaining demodulation efficiency
3Productivity
If non-orthogonal user access is implemented, then network capacity is increased, but SINR decreases due to user interference
Solution Approach 1:
The patent changes the modulation parameter to a new scheme with lower PAPR characteristics, which improves SINR in non-orthogonal multiple access scenarios by reducing the impact of power amplifier non-linearity and user interference, thereby maintaining network capacity
4Use of energy by moving object
If power consumption is reduced for mMTC services, then battery life is extended, but signal transmission capability is compromised
Solution Approach 1:
The patent changes the modulation parameter to achieve lower PAPR, which allows power amplifiers to operate in more efficient regions, reducing power consumption for mMTC devices while maintaining adequate signal transmission capability through the improved modulation scheme
Data Source
AI summary
Provided are a data transmission method and device and a storage medium. The data transmission method includes performing (S110) pointwise multiplication between a first data sequence and a second data sequence to obtain a third data sequence, where the first data sequence and the second data sequence are each a frequency-domain data sequence; performing (S120) an inverse Fourier transform on the third data sequence to obtain a fourth data sequence; and transmitting (S130) the fourth data sequence on a physical time-frequency resource.