MIMO Transmit Vector Determination for Wireless Resource Sharing
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Solution Overview
Problem
In wireless communications systems using carrier sense multiple access (CSMA) technology, the strong anti-interference capability of MIMO technology is not effectively utilized, leading to inefficient radio resource usage due to incorrect clear channel assessment, causing nodes to refrain from using shared radio resources.
Innovation Solution
The proposed solution involves determining transmit and receive vectors based on statistical channel measurements and spatial correlation matrices to ensure that multiple nodes can share the same radio resource without causing interference, allowing for efficient data transmission by using these vectors within specific time frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional CCA is applied to detect channel occupancy, then channel access decision is simple, but radio resource usage efficiency deteriorates because MIMO anti-interference capability is not utilized
Solution Approach 1:
The patent changes the parameter for channel access decision from simple occupancy detection to statistical channel measurement and spatial correlation analysis. By introducing transmit antenna spatial correlation matrix and receive effective channel vector, the system can distinguish between harmful interference and useful signal, enabling MIMO nodes to share radio resources efficiently while maintaining simple CCA operation.
Solution Approach 2:
The patent introduces statistical channel measurement and spatial correlation analysis as an intermediary mechanism between traditional CCA and data transmission. This intermediary layer provides additional information about channel conditions and interference characteristics, allowing nodes to make more informed access decisions that utilize MIMO anti-interference capabilities without complicating the basic channel sensing process.
2Productivity
If multiple nodes share the same radio resource, then radio resource usage efficiency improves, but interference between nodes increases
Solution Approach 1:
The patent applies local quality by considering spatial correlation characteristics specific to each node's channel conditions. Each node performs statistical channel measurement and obtains receive effective channel vector tailored to its specific spatial environment. This allows nodes to share radio resources while adapting their transmission characteristics to their local channel conditions, thereby reducing interference through spatial diversity and correlation-aware transmission.
3Ease of operation
If CCA is used to detect channel occupancy, then channel access is straightforward, but MIMO anti-interference capability is wasted
Solution Approach 1:
The patent applies preliminary action by performing statistical channel measurement and obtaining spatial correlation matrices before actual data transmission. Nodes proactively gather channel state information and calculate correlation characteristics in advance, enabling them to make informed access decisions that leverage MIMO anti-interference capabilities while maintaining straightforward CCA operation for initial channel sensing.
Data Source
AI summary
Embodiments provide an access method and a device, where the method includes: determining that N second receiving devices communicate with a second sending device by using a radio resource, where N is a positive integer greater than or equal to 1; obtaining a receive effective channel vector from each second receiving device to a first sending device; obtaining a transmit antenna spatial correlation matrix of the first sending device; determining M transmit vectors; and separately communicating, by the first sending device, with K first receiving devices by using K of the M transmit vectors, where K is a positive integer less than or equal to M. According to the foregoing technical solutions, in a case in which the radio resource has been occupied by the second receiving device, the first sending device can send data by using the radio resource.