OTFS Wireless Communication Edge Region Power Allocation
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Solution Overview
Problem
In multi-user Orthogonal Time Frequency Space (OTFS) systems, delay spread and Doppler spread cause multi-user interference, degrading system performance, especially in edge regions of delay-Doppler domains.
Innovation Solution
The system divides the delay-Doppler resource into edge and non-edge regions, setting different average signal powers for each, and uses an iterative serial de-interference decoding method to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform power allocation is used across all delay-Doppler regions, then system implementation is simple, but multi-user interference in edge regions degrades performance
Solution Approach 1:
The patent applies local quality by differentiating power allocation between edge regions and non-edge regions in the delay-Doppler domain. Specifically, users at edge regions are allocated different power levels compared to users in non-edge regions, addressing the localized interference problem at edges while maintaining overall system performance. This regional differentiation resolves the contradiction by making the system adaptive to local interference conditions rather than using uniform allocation throughout.
2Productivity
If iterative serial de-interference decoding is implemented, then decoding efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the decoding process into multiple iterative stages. In each iteration, the receiver sequentially decodes users in the delay-Doppler domain, removes decoded users' signals from the composite signal, and proceeds to decode remaining users. This segmented iterative approach improves decoding efficiency by systematically eliminating interference, while the modular structure allows the complexity to be managed through repeated application of the same decoding template.
Solution Approach 2:
The patent applies preliminary action by performing interference removal in advance before final decoding. The iterative process pre-decodes certain users and removes their signals from the composite signal, creating a cleaner received signal for subsequent decoding operations. This preliminary interference elimination improves the overall decoding efficiency by reducing the interference burden on later decoding stages.
Data Source
AI summary
A method for wireless communication includes: dividing a delay Doppler resource occupied by a first orthogonal time frequency space (OTFS) symbol into M delay Doppler regions, the first delay Doppler region being one of the M delay Doppler regions, M being a natural number not less than 1; and dividing the first time delay Doppler region into an edge region and a non-edge region in a time delay displacement dimension and a Doppler displacement dimension, and setting the signal average power of the edge region to be different from the signal average power of the non-edge region.