Frequency-Domain Offsets for Multi-AP Channel Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-access point collaboration and concurrency solutions, the simultaneous signal transmission by APs causes mutual interference, affecting detection performance and network throughput due to uncontrolled interference between signals from different access points.
Innovation Solution
Implementing a method that adjusts time and frequency domain offsets for collaboration devices to send signals on different time and frequency resources, reducing interference and improving channel estimation and demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-AP joint scheduling mode is used to send signals simultaneously on the same frequency, then network throughput is improved, but mutual interference between signals causes deterioration in detection performance
Solution Approach 1:
The patent segments the frequency domain resources by introducing frequency domain offsets for different collaboration devices. Each device transmits on a different frequency subcarrier, dividing the original frequency resource into multiple orthogonal sub-resources. This eliminates mutual interference while maintaining simultaneous transmission capability, thus improving both throughput and detection performance.
Solution Approach 2:
The patent introduces a frequency domain offset dimension to differentiate signals from multiple collaboration devices. By shifting signals in the frequency domain, the patent transforms the problem from time-domain interference to frequency-domain orthogonality, enabling interference-free simultaneous transmission and improving detection performance.
2Productivity
If multiple collaboration devices send signals at the same time on the same frequency, then air interface utilization is maximized, but interfering signals cannot be removed in channel estimation
Solution Approach 1:
The patent segments frequency resources by allocating different frequency domain offsets to different collaboration devices. This division creates orthogonal frequency sub-channels, allowing simultaneous transmission without interference. The channel estimation can then be performed independently on each orthogonal sub-channel, ensuring high precision while maximizing air interface utilization.
Solution Approach 2:
The patent changes the frequency domain parameters by introducing frequency domain offsets as a new dimension for resource differentiation. This parameter change transforms overlapping frequency resources into separated orthogonal resources, enabling reliable channel estimation and maintaining high air interface utilization through efficient frequency multiplexing.
Data Source
AI summary
This application provides a signal transmission method and apparatus. The method includes: A collaboration device receives a synchronization trigger frame delivered by a central device; the collaboration device obtains information about a time domain offset and/or information about a frequency domain offset; and the collaboration device sends a signal based on the synchronization trigger frame and the information about the time domain offset and/or the information about the frequency domain offset by using a corresponding time domain resource and a corresponding frequency domain resource. In this way, a plurality of collaboration devices send different time domain resources and/or frequency domain resources to a same terminal, and an interfering signal in channel estimation can be removed. This improves precision of the channel estimation and noise estimation at a receiving end, and improves demodulation performance at the receiving end and entire-network throughput.