Delay-Doppler Grid Waveform Shaping for Bandwidth Efficiency
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Solution Overview
Problem
Current wireless communication networks are facing bandwidth constraints due to the rapid growth in wireless data traffic, necessitating the development of next-generation wireless technologies that can efficiently manage high data volumes and maintain quality of service.
Innovation Solution
The proposed solution involves using a two-dimensional delay-Doppler grid to map information bits and reference signals to transmission resources, generating an orthogonal time frequency space (OTFS) waveform through signal combination, and applying time domain spreading to enhance transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional wireless communication methods are used, then current network infrastructure can be maintained, but bandwidth is insufficient to accommodate high data traffic growth
Solution Approach 1:
The patent transitions from conventional two-dimensional time-frequency resource allocation to a three-dimensional delay-Doppler grid framework. By introducing the delay dimension alongside Doppler and time dimensions, the system creates additional resource allocation space, enabling more efficient bandwidth utilization and accommodating higher data traffic volumes without requiring proportional infrastructure expansion
2Quantity of substance
If bandwidth is increased to accommodate more data traffic, then data transmission capacity improves, but network complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the wireless resource space into a structured delay-Doppler grid with discrete elements, where each grid point represents a specific delay-Doppler signature. This segmentation transforms continuous resource allocation into discrete unit allocation, simplifying resource management and reducing complexity while enabling efficient bandwidth utilization through systematic grid-based allocation schemes
3Reliability
If traditional time-frequency signaling is used, then compatibility with existing systems is maintained, but quality of service deteriorates under high mobility and Doppler conditions
Solution Approach 1:
The patent fundamentally changes the resource representation parameters from time-frequency coordinates to delay-Doppler coordinates. By transforming the signaling domain to match the physical channel characteristics (delay and Doppler shifts), the system achieves robust quality of service under high mobility conditions while maintaining adaptability through the inherent Doppler-resilient structure of the delay-Doppler grid framework
Data Source
AI summary
Methods, systems and devices for wireless communication are described. One example method includes generating a transmission waveform comprising modulated data symbols carrying information bits, wherein the modulated data symbols are organized in a number of data frames along a delay-Doppler grid comprising N Doppler elements and M delay elements, where N and M are positive integers, and transmitting the transmission waveform using frequency and time resources wherein: (a) a reduced power frequency portion of the frequency resources is configured such that a power of the transmission waveform in the reduced power frequency portion is below a first threshold, or (b) a reduced power time portion of the time resources is configured such that the power of the transmission waveform in the reduced power time portion is below a second threshold.