Uplink Resource Allocation for OTFS Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication networks face challenges in managing high data traffic and providing quality of service due to bandwidth limitations, particularly in uplink transmissions, where peak to average power ratio (PAPR) issues affect power efficiency and non-linearity, leading to suboptimal performance in next-generation wireless technologies.
Innovation Solution
The implementation of an Orthogonal Time Frequency Space (OTFS) modulation scheme for uplink transmissions, which allocates resources in the delay-Doppler domain, reducing PAPR and improving bandwidth utilization by spreading signals across time and frequency, thereby enhancing power efficiency and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional uplink transmission schemes are used, then bandwidth utilization is achieved, but peak to average power ratio (PAPR) increases leading to power inefficiency and non-linearity
Solution Approach 1:
The patent transforms the resource allocation from conventional time-frequency domain to delay-Doppler domain, adding a dimensional transformation approach. By performing OTFS transformation, signals are mapped to a new domain where resource elements are organized in terms of delay and Doppler shift rather than time and frequency, fundamentally changing how transmission resources are structured and allocated
2Productivity
If signals are concentrated in specific time-frequency resources, then transmission efficiency is improved, but interference increases and time-frequency diversity is not exploited
Solution Approach 1:
The patent spreads signals across the entire time-frequency grid by transforming resource allocations from delay-Doppler domain to time-frequency domain. Each resource element in delay-Doppler domain corresponds to a spread signal across multiple time-frequency points, achieving both high throughput and reduced interference through time-frequency diversity
Solution Approach 2:
The patent divides transmission resources into discrete resource elements in the delay-Doppler domain, allowing independent allocation and control. This segmentation enables precise resource management while the OTFS transformation ensures each segmented resource contributes to overall diversity and interference reduction
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A method of reducing peak to average power ratio of uplink transmission includes, assigning a slice of transmission resource to uplink transmission from a user equipment, where all resource elements in the slice have a same Doppler value, mapping data to the slice, performing orthogonal time frequency space transformation to generate time-frequency domain data and processing the time-frequency domain data for transmission.