Cooperative Relay Precoding Matrix Synthesis
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Solution Overview
Problem
In cooperative relay systems, conventional pre-coding methods fail to ensure similar transmission performance for multiple receivers, leading to suboptimal performance in point-to-multipoint transmission scenarios.
Innovation Solution
A pre-coding method that involves obtaining local optimal sub-channels and performing Singular Value Decomposition (SVD) to determine a synthesized optimal sub-channel pre-coding matrix, allowing data to be transmitted efficiently across multiple relay stations, ensuring similar performance for each receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pre-coding methods are used in cooperative relay systems, then the transmitter can transmit data to multiple receivers simultaneously, but the transmission performance becomes unequal across different receivers
Solution Approach 1:
The patent segments the pre-coding process into two distinct stages: first obtaining local optimal pre-coding matrixes for each relay station independently, then synthesizing these into a global optimal pre-coding matrix through SVD decomposition. This segmentation allows each relay station to be optimized individually while maintaining overall system performance, resolving the contradiction between transmission rate and performance equality.
Solution Approach 2:
The patent merges the local optimal pre-coding matrixes from multiple relay stations into a single synthesized global optimal pre-coding matrix using Singular Value Decomposition. This combining process ensures that all receivers receive equal attention and achieve similar transmission performance while maintaining high data transmission rates through parallel transmission to multiple relay stations.
2Productivity
If point-to-multipoint pre-coding scheme is applied, then different data packets can be transmitted in parallel to multiple receivers, but the same data cannot be transmitted to multiple relay stations with similar performance
Solution Approach 1:
The patent applies local quality by first determining pre-coding matrixes tailored to each relay station's specific channel conditions. Each relay station receives a customized pre-coding matrix optimized for its local channel characteristics, ensuring that each receiver achieves optimal transmission performance for its specific conditions while maintaining fairness across all receivers.
Solution Approach 2:
The patent creates a universal solution by synthesizing the local optimal pre-coding matrixes into a global optimal pre-coding matrix that works for all relay stations simultaneously. This universal pre-coding matrix can be applied to transmit the same data to multiple relay stations with consistent performance, making the system adaptable to various channel conditions while maintaining throughput efficiency.
Data Source
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AI summary
The embodiments of the present invention disclose a pre-coding method in a cooperative relay system. The pre-coding method in the cooperative relay system includes: obtaining pre-coding matrixes of local optimal sub-channels to single links of respective relay stations; and obtaining a pre-coding matrix of a synthesized optimal sub-channel according to the pre-coding matrix of each local optimal sub-channel. The embodiments of the present invention also disclose a communication apparatus and a relay apparatus. The present invention is applicable to pre-coding between a transmitter and a relay station in a cooperative relay system.