Sub-THz FTN Signaling With MCS-Based Spectral Packing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in improving spectral efficiency and mitigating high path loss, inefficiencies in power amplifiers, and short delay spreads in sub-terahertz communications.
Innovation Solution
Implementing Faster Than Nyquist (FTN) signaling with a configuration that extends subTHz scheduling to support non-orthogonal waveforms, reducing packing ratio while maintaining lower modulation orders, and utilizing single carrier waveforms to enhance power amplifier efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal waveforms are used in sub-THz communication, then interference between signals is reduced, but spectral efficiency decreases
Solution Approach 1:
The patent inverts the traditional approach by using non-orthogonal waveforms instead of orthogonal waveforms. This inversion allows signals to overlap in time and frequency domains, achieving faster than Nyquist rate transmission. The receiver uses advanced signal processing to resolve the non-orthogonal signals, thereby improving spectral efficiency while managing interference through mathematical separation rather than physical orthogonality.
Solution Approach 2:
The patent changes the fundamental parameter of waveform orthogonality to non-orthogonality. By adjusting the packing ratio to be greater than 1 and modifying the pulse shaping parameters, the system achieves faster transmission rates. The receiver compensates for the changed parameters through equalization and interference cancellation techniques, maintaining reliability while improving spectral efficiency.
2Productivity
If higher modulation orders are used to increase spectral efficiency, then data rate increases, but power amplifier efficiency decreases due to higher peak to average power ratio
Solution Approach 1:
The patent employs dynamic pulse shaping and adaptive packing ratios that adjust the signal characteristics in real-time. By dynamically controlling the waveform parameters and using single-carrier modulation with optimized pulse shapes, the system maintains lower peak to average power ratios even at high spectral efficiency. This dynamic adaptation allows the power amplifier to operate more efficiently while achieving high data rates through increased packing ratios rather than higher modulation orders.
3Speed
If faster transmission rates are implemented, then communication speed increases, but signal distortion and interference increase
Solution Approach 1:
The patent implements feedback mechanisms where the receiver estimates the channel conditions and signal quality, then feeds this information back to the transmitter. Based on the feedback, the transmitter adjusts the packing ratio, pulse shaping parameters, and modulation scheme to optimize both speed and signal quality. This closed-loop control ensures that faster transmission rates are maintained only when channel conditions permit, thereby managing signal distortion and interference effectively.
Solution Approach 2:
The patent applies preliminary pulse shaping and pre-equalization at the transmitter before signal transmission. By pre-processing the signal with optimized pulse shapes and anticipating channel effects, the system prepares the signal to withstand faster transmission rates with minimal distortion. The receiver then applies corresponding equalization to complete the compensation, ensuring signal quality is maintained at higher speeds.
Data Source
AI summary
Method and apparatus for adding FTN for subTHz communication. The apparatus receives information indicating a MCS index, the MCS index being associated with at least a FTN compression factor, a modulation order, and a coding rate. The apparatus performs one of demodulating DL data or modulating UL data based on the received information indicating the MCS index associated with the FTN compression factor, the modulation order, and the coding rate. The apparatus may transmit the modulated UL data in an UL transmission through one of FTN compression factor equal to 1 or FTN compression factor less than 1, wherein the UL data is modulated based on the FTN compression factor. The apparatus may receive the DL data in a DL transmission through one of FTN compression factor equal to 1 or FTN compression factor less than 1, wherein the received DL data is demodulated based on the FTN compression factor.