Relay Node Selection for Diversity Gain in Wireless Terminals
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Solution Overview
Problem
In wireless communication environments, multi-antenna installations are not feasible in small user terminals to achieve diversity gain, leading to a need for improved frequency efficiency in cooperative communication systems.
Innovation Solution
A communication device and relay device that select and utilize a relay node based on channel information to perform network-coding, enhancing signal reception and decoding through equivalent channel estimation and Log Likelihood Ratio calculations, thereby improving frequency efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-antenna is installed in user terminal, then diversity gain is obtained, but device size and complexity increase making it infeasible for small terminals
Solution Approach 1:
The patent introduces relay nodes as intermediary devices that perform network coding to provide diversity gain. Instead of equipping small terminals with multiple antennas, relay nodes with multiple antennas act as mediators to receive, encode, and retransmit signals, thereby achieving diversity gain without increasing the complexity of user terminals.
2Productivity
If cooperative communication is implemented, then frequency efficiency is improved, but relay node selection and network-coding complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where relay nodes report channel state information and equivalent channel information to the communication device. The communication device uses this feedback to select optimal relay nodes and perform decoding based on equivalent channel estimation, thereby managing the complexity of relay node selection and network-coding through informed decision-making.
Solution Approach 2:
The patent transforms the complex multi-hop relay selection problem into a simpler equivalent channel estimation problem. By defining equivalent channels that combine the effects of multiple hops, the system changes the parameters of the selection criterion from individual link qualities to composite equivalent channel qualities, simplifying the relay node selection process while maintaining frequency efficiency.
Data Source
AI summary
A communication device that may select a relay node from a plurality of relay nodes, and be used as a signal receiving node through the selected relay node is provided. Additionally, a relay device that may be used as a relay node to receive and broadcast signals is provided.