Bi-Directional Relay Encoding for Lower-Power Wireless Throughput
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Solution Overview
Problem
Current wireless communication systems using traditional relaying protocols require four phases for bidirectional communication, leading to inefficient power usage and suboptimal signal-to-noise ratio, especially in broadcast-type channels, and do not effectively exploit a priori known information for interference cancellation.
Innovation Solution
A method employing non-linear encoding and decoding at a relaying node, where nodes store and utilize a priori known information to form and transmit reduced representations of signals, allowing for reduced power usage and improved signal processing efficiency, applicable in various transmission techniques including OFDM and MIMO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional four-phase relaying protocol is used for bidirectional communication, then communication reliability is maintained, but power consumption increases and throughput decreases
Solution Approach 1:
The patent combines two separate unidirectional transmissions into a single bidirectional transmission phase. The relay node receives signals from both end nodes simultaneously and forwards a combined signal containing information from both directions, reducing the total number of transmission phases from four to two and improving spectral efficiency
Solution Approach 2:
The end nodes perform preliminary interference cancellation by subtracting their own transmitted signals from the received composite signal before decoding. This preliminary action enables successful decoding of the other node's transmission despite the interference, making the compressed bidirectional protocol feasible
2Reliability
If traditional relaying protocol is used, then signal transmission is simplified, but signal-to-noise ratio deteriorates due to increased transmissions
Solution Approach 1:
The relay node merges the two incoming signals from opposite end nodes into a single composite transmission signal. This combining approach reduces the total number of transmissions required for bidirectional communication from four to two phases, improving energy efficiency while maintaining signal quality through the interference cancellation mechanism
3Reliability
If a priori known information is not utilized, then decoding is straightforward, but interference cancellation is ineffective
Solution Approach 1:
Each end node performs preliminary interference cancellation by utilizing knowledge of its own transmitted signal to subtract the interference component from the received composite signal. This preliminary processing step enables effective interference removal while keeping the decoding complexity manageable through the use of available a priori information
Data Source
AI summary
A relaying node is in bidirectional communication with at least a first and a second sending/receiving radio node, and the relaying radio node receives at least a first signal carrying at least first data and a second signal carrying at least second data. The relaying node generates a reduced representation of at least the first and second signal, with a reduced information content as compared to the first and second data, by a joint non-linearly encoding operation, and transmits the reduced representation to at least the first and the second communication node. The first and second sending/receiving node can extract data from the reduced representation by a non-linear decoding operation using stored a priori information.