Signal Processing Method for Multi-User Spatial Weight Subspace Interference Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-density radio coverage communications systems, signal interference occurs when multiple user equipment devices receive signals from the same frequency, degrading service quality due to large overlaps between coverage areas and lack of cell edges.
Innovation Solution
A signal processing method that determines active and interference sets for each user equipment based on power measurement values, calculates weights to cancel out interference between user equipment devices, and adjusts these weights to minimize interference while maximizing signal strength, allowing simultaneous frequency use without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a site sends signals to multiple user equipments at the same time in a same frequency, then system capacity is improved, but signal interference between user equipments occurs
Solution Approach 1:
The patent segments the signal transmission space by introducing spatial dimensions (weight subspaces) to separate different user equipment signals. Each user equipment is assigned a unique weight vector that defines its spatial signature, effectively dividing the shared frequency resource into distinct spatial channels that prevent interference while maintaining high system capacity.
2Area of stationary object
If coverage area overlap is increased in high density radio coverage, then network coverage is improved, but signal interference between user equipments increases
Solution Approach 1:
The patent transitions from traditional two-dimensional coverage area optimization to a three-dimensional solution by incorporating spatial weight vectors. This adds a new dimension (spatial signature dimension) to the coverage problem, allowing signals to coexist in the same frequency and geographic area while being separated through their unique weight vector signatures, thereby enabling extended coverage without proportional increase in interference.
Data Source
AI summary
The present invention discloses a signal processing method, apparatus, and system. In M user equipments, an active set Ki and an interference set K′i of a user equipment i are determined according to power measurement values from the user equipment i to N sites; for the active set Ki of the user equipment i, superposition of sent signals of all other user equipments j of all active sites ki are cancelled out with each other, to obtain one constraint condition of a weight, and for the M user equipments, M constraint conditions are obtained, and a weight subspace T is determined; and one weight is determined in the weight subspace according to an interfering signal of another user equipment j for the user equipment i in the interference set K′i of the user equipment i and a wanted signal of the user equipment i in the active set Ki of the user equipment i.