OTFS Precoding via Delay-Doppler Sub-Block Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OTFS multi-antenna transmission, there is a mismatch between space-domain precoding performed on the delay-Doppler domain collectively and the actual channel, leading to suboptimal performance.
Innovation Solution
The delay-Doppler domain is divided into N sub-blocks, and precoding is performed on each sub-block with a corresponding codeword. The signal is then transformed into the time-frequency domain for transmission, aiming to achieve a better match between the precoding and the actual channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If space-domain precoding is performed on the delay-Doppler domain collectively through multi-antenna precoding, then the device complexity is reduced, but the matching between precoding and actual channel deteriorates
Solution Approach 1:
The delay-Doppler domain is divided into multiple sub-blocks, and precoding is performed separately on each sub-block rather than collectively on the entire domain. This segmentation allows the precoding to better adapt to local channel characteristics in different delay-Doppler regions, improving the matching accuracy while maintaining manageable complexity through structured processing.
Solution Approach 2:
Different precoding strategies are applied to different sub-blocks of the delay-Doppler domain based on their specific channel characteristics. This local quality approach ensures that each sub-block receives precoding optimized for its particular delay and Doppler conditions, thereby improving overall precoding-channel matching accuracy.
2Manufacturing precision
If the delay-Doppler domain is divided into N sub-blocks for precoding, then the precoding-channel matching is improved, but the device complexity increases
Solution Approach 1:
The delay-Doppler domain is divided into N sub-blocks to enable localized precoding optimization. While this increases processing complexity compared to collective precoding, the segmentation is structured such that each sub-block can be processed independently with standardized procedures, making the complexity manageable and scalable.
Solution Approach 2:
The precoding approach transitions from a static collective processing method to a dynamic sub-block based method where different precoding parameters can be applied to different sub-blocks. This dynamic approach allows adaptation to varying channel conditions across the delay-Doppler domain while maintaining systematic processing through defined sub-block structures.
Data Source
AI summary
This application discloses methods for transmitting information, a terminal, and a network side device. The method for transmitting information includes: transmitting, by a second device, a first signal to a first device. The first signal is generated precoding a signal mapped on N sub-blocks of a first signal domain corresponding to the sub-blocks, and then transforming the precoded signal into a time-frequency domain. The first signal domain is a delay-Doppler domain, the first signal domain is divided into the N sub-blocks, and N is a positive integer greater than or equal to 2.