Distributed Decode Forward Wireless Multi-Hop Signal Forwarding
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Solution Overview
Problem
Existing multi-hop wireless communication systems face inefficiencies in signal transmission due to varying network topologies and channel gains, as existing schemes like Amplify-Forward, Decode-Forward, and Compress-Forward perform poorly in dynamic wireless environments.
Innovation Solution
The implementation of a Distributed Decode Forward (DDF) scheme, which involves partial decoding of received signals at relay nodes to generate function signals, enabling joint decoding and efficient channel encoding for transmission across arbitrary network topologies and channel gains, thereby stabilizing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Amplify-Forward, Decode-Forward, or Compress-Forward schemes are used in multi-hop wireless networks, then signal transmission can be performed in specific network topologies, but the performance becomes unstable when network topology or channel gain varies
Solution Approach 1:
The patent applies universality by designing a joint decoding framework that can handle arbitrary network topologies and channel gains. The destination node performs joint decoding on signals from multiple relay nodes simultaneously, creating a universal solution that adapts to different network configurations without requiring topology-specific optimization, thus achieving both stability and versatility.
Solution Approach 2:
The patent implements dynamics by making the decoding process adaptive to varying channel conditions. The joint decoding scheme dynamically adjusts to different channel gains and network topologies through maximum likelihood detection that incorporates current channel state information, allowing the system to maintain optimal performance despite changes in network conditions.
2Productivity
If Decode-Forward is performed in each link using single hop channel code, then decoding can be performed at each relay node, but transmission efficiency becomes very inefficient compared to joint decoding on the overall network
Solution Approach 1:
The patent merges the decoding operations of multiple relay nodes into a single joint decoding process at the destination node. Instead of each relay node independently decoding signals using separate single-hop channel codes, the destination node combines all received signals and performs unified joint decoding, thereby improving transmission efficiency while managing complexity through centralized processing.
3Reliability
If wired connection is used to connect small-cell BSs, then reliable communication can be established, but it becomes cost-inefficient
Solution Approach 1:
The patent substitutes the mechanical wired connection system with a wireless communication system. By using wireless backhaul links between small-cell base stations and macro base stations, the system eliminates the need for physical wired infrastructure while maintaining communication reliability through joint decoding techniques that compensate for wireless channel variability.
Data Source
AI summary
A wireless multi-hop network includes a source node, at least one relay node, and a destination node. Each relay node is configured to perform partial decoding on a received signal including at least one previous-hop transmission signal according to a predefined function to calculate a function signal for the at least one previous-hop transmission signal, and encode the function signal and transmit the encoded function signal to a next hop. A destination node includes a receiver configured to obtain a received signal comprising a combination of a plurality of transmission signals for transmission by a source node and to be relayed by at least one relay node, and a decoder configured to configure a decoder graph corresponding to channel coding by the source node and relay nodes and to joint-decode the received signal according to the decoder graph to detect information blocks from the received signal.