Relay Node Interference Cancellation in Multi-Hop MIMO Networks
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Solution Overview
Problem
In multi-hop networks, conventional methods struggle to effectively control interference between multiple node pairs and relay nodes, especially in scenarios where simultaneous signal transmission occurs, leading to inefficiencies in data transmission and increased noise.
Innovation Solution
The method involves relaying signals from source nodes to destination nodes while controlling channel coefficients of relay nodes to cancel interference signals, using techniques such as generating an effective interference channel matrix and a reference matrix to neutralize interference, and employing zero-forcing beamforming or successive interference cancellation methods based on channel state information availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional relay methods use multiple relay nodes to obtain diversity gain or multiplexing gain, then system capacity and reliability are improved, but interference between multiple node pairs and relay nodes increases
Solution Approach 1:
The patent converts harmful interference signals into beneficial information by having relay nodes transmit interference signals that are intentionally designed to be cancelable at destination nodes. The interference channel matrices are controlled to enable destination nodes to generate and subtract interference cancellation signals, transforming what was previously harmful interference into a controllable and eliminable factor that enables reliable multi-hop communication.
Solution Approach 2:
The patent changes the parameters of the interference signals by controlling the channel coefficients of relay nodes. By adjusting these channel parameters, the system enables destination nodes to calculate interference cancellation signals that match the interference characteristics, allowing for effective interference removal while maintaining system reliability.
2Productivity
If simultaneous signal transmission by multiple node pairs is performed, then network throughput and efficiency are improved, but interference control becomes more difficult
Solution Approach 1:
The patent implements a feedback mechanism where destination nodes calculate interference cancellation signals based on received interference channel matrices and transmit these cancellation signals back to source nodes or relay nodes. This feedback loop enables automatic interference management, allowing simultaneous transmissions while maintaining tractable interference control through distributed signal processing at destination nodes.
3Device complexity
If fewer relay nodes are used, then system complexity is reduced, but interference cancellation capability is degraded
Solution Approach 1:
The patent introduces destination nodes as active intermediaries that perform interference cancellation operations. Instead of relying solely on relay nodes to manage interference, the destination nodes themselves calculate and subtract interference signals using received channel state information. This shifts the interference management function to the destination, enabling effective interference cancellation with fewer relay nodes while maintaining system reliability.
Data Source
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AI summary
A method of controlling interference of relay nodes and node pairs in a multi-hop network, includes relaying signals received from source nodes among the node pairs to destination nodes pairing with the source nodes, and cancelling a part of interference signals between the node pairs by controlling channel coefficients of the relay nodes. The destination nodes are configured to cancel residual interference signals among the interference signals, using the signals received by the destination nodes.