Resource-Block Data Modulation Without Guard Bandwidth Waste
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Solution Overview
Problem
Existing wireless communication technologies face interference issues due to inter-sub-band interference and frequency resource waste, particularly in multi-bandwidth channels, which are exacerbated by the use of CP-OFDM and guard bandwidths, necessitating improved waveform schemes for sixth-generation communication.
Innovation Solution
A data transmission method involving inverse Fourier transform and upsampling operations on frequency domain resource blocks, followed by filtering and dot multiply operations, to form and transmit groups of data sequences, ensuring efficient use of frequency resources and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CP-OFDM is used to solve multipath delay, then frequency-selective channels are divided into parallel flat channels, but inter-sub-band interference increases due to spectrum leakage
Solution Approach 1:
The patent segments the frequency domain resource blocks into multiple groups, where each group undergoes separate inverse Fourier transform and upsampling operations. This segmentation allows independent processing of different frequency resources, reducing the spectrum leakage-induced interference between sub-bands while maintaining the multipath delay mitigation capability of CP-OFDM.
2Object-generated harmful factors
If guard intervals are inserted in frequency domain to reduce inter-sub-band interference, then spectral efficiency decreases
Solution Approach 1:
The patent extracts and removes the harmful spectrum leakage components through upsampling operations before inverse Fourier transform. By processing each frequency domain resource block group separately and applying upsampling, the method eliminates the need for traditional frequency-domain guard intervals, thereby maintaining spectral efficiency while reducing inter-sub-band interference.
3Adaptability or versatility
If different parameter sets are used between adjacent sub-bands, then waveform adaptability improves, but orthogonality between subcarriers is disrupted causing interference
Solution Approach 1:
The patent implements dynamic parameter configuration for different frequency domain resource block groups, allowing each group to have independent upsampling factors and inverse Fourier transform sizes. This dynamic adaptation enables different parameter sets for adjacent sub-bands while maintaining orthogonality through separate processing paths, thus achieving waveform adaptability without subcarrier interference.
4Reliability
If guard bandwidth is inserted between transmission bandwidths with different parameter sets, then subcarrier orthogonality is maintained, but frequency resource waste occurs
Solution Approach 1:
The patent applies local quality processing by performing upsampling and inverse Fourier transform operations independently on each frequency domain resource block group. This localized processing ensures that orthogonality is maintained at each local group level without requiring global guard bandwidth insertion, thereby eliminating frequency resource waste while preserving subcarrier orthogonality.
Data Source
AI summary
A data transmission method includes transmitting to-be-transmitted data in N frequency domain resource blocks, where each of the N frequency domain resource blocks includes K(n) subcarriers, where n=1, 2, . . . , N, N is greater than or equal to 1, and K(n) is greater than or equal to 1; performing inverse Fourier transform and an upsampling operation on the to-be-transmitted data in each of the N frequency domain resource blocks to form N groups of data sequences; and transmitting the N groups of data sequences.