Full-Duplex Multi-Hop Relay Interference Cancellation
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Solution Overview
Problem
Current full-duplex communication methods for multi-hop wireless networks face instability and inefficiency due to self-interference and intra-flow interference, especially when the number of relay nodes increases, leading to error propagation and reduced network throughput.
Innovation Solution
The method involves estimating and canceling self-interference and intra-flow interference per node by sending transmission requests and confirmations in forward and reverse orders, respectively, using specific cancellation signals to stabilize full-duplex communication, thereby improving network throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hierarchical interference estimation and cancellation is used, then full-duplex communication can be implemented, but error propagation occurs when interference channel estimation is inaccurate
Solution Approach 1:
The patent divides the multi-hop transmission path into multiple segments, with each relay node independently estimating and canceling interference for its own segment. This segmentation prevents error propagation across the entire chain, as each node operates autonomously with local interference cancellation rather than relying on hierarchical estimation from previous nodes.
Solution Approach 2:
The patent performs interference channel estimation and cancellation in advance during a training phase before actual data transmission. Each relay node estimates its interference channels and prepares cancellation signals beforehand, ensuring accurate interference removal when full-duplex communication occurs, thereby preventing estimation errors from affecting data transmission.
2Length of stationary object
If the number of relay nodes increases, then network coverage is extended, but full-duplex communication cannot be performed due to error propagation
Solution Approach 1:
Each relay node independently handles interference cancellation for its own transmission segment, breaking the chain into autonomous units. This prevents errors from propagating across multiple hops, allowing the network to scale to any number of relay nodes while maintaining full-duplex stability at each segment.
Solution Approach 2:
Each relay node performs self-service by independently estimating its own interference channels and generating cancellation signals for its transmissions. This autonomous operation eliminates dependency on other nodes' estimation accuracy, enabling reliable full-duplex communication regardless of the total number of relay nodes in the network.
3Productivity
If full-duplex communication is implemented, then network throughput is improved, but self-interference and intra-flow interference prevent stable operation
Solution Approach 1:
The patent extracts and removes harmful interference components from the received signals at each relay node. By identifying self-interference and intra-flow interference as separate cancellable components, the system subtracts these harmful factors from the received signals, enabling stable full-duplex operation while maintaining high throughput.
Solution Approach 2:
The patent converts the harmful interference signals into useful cancellation references. By using transmitted training sequences and known channel states, the system generates accurate models of self-interference and intra-flow interference, then applies these models to cancel the harmful effects, effectively transforming the interference problem into a solvable estimation task.
Data Source
AI summary
A full-duplex communication method for a multi-hop wireless network including a source end for transmitting data, a destination end as a destination of the data and at least one relay for connecting the source end and the destination end wirelessly includes sending a transmission request from the source end to the destination end through the at least one relay in forward order, sending a transmission confirmation from the destination end to the source end through the at least one relay in reverse order in response to the transmission request and the at least one relay entering a ready state, and transmitting the data from the source end to the destination end through the at least one relay using a full-duplex scheme after receiving the transmission confirmation.