Per-Node MIMO Precoding Matrix Management in Multi-Node Systems
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Solution Overview
Problem
In multi-node wireless communication systems, the conventional MIMO precoding matrix approach results in an excessive number of matrices that need to be predetermined, limiting system efficiency and backward compatibility due to increased complexity in managing multiple transmit antennas and varying channel conditions across nodes.
Innovation Solution
A signal transmission method that employs per-node precoding matrices determined for each node, with feedback information including rank, antenna number, and channel quality indicators, allowing for optimal rank application and reduced matrix complexity by reusing MIMO precoding matrices across nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional MIMO precoding scheme is used in multi-node system, then signal transmission can be performed, but the number of MIMO precoding matrices that must be predetermined is excessively increased
Solution Approach 1:
The patent segments the overall MIMO precoding function into per-node precoding matrices. Instead of determining one large precoding matrix for all nodes, each node independently determines its own precoding matrix based on its channel state information. This segmentation reduces the total number of matrices needed while maintaining signal transmission capability across multiple nodes.
Solution Approach 2:
The patent applies local quality by allowing each node to have its own precoding matrix optimized for its specific channel conditions. Each node determines precoding matrices tailored to its local environment rather than using a unified set of matrices for all nodes, thereby reducing overall system complexity while adapting to local channel characteristics.
2Productivity
If multiple transmit antennas are deployed in multi-node system, then data capacity is increased, but the complexity in managing multiple transmit antennas and varying channel conditions across nodes increases
Solution Approach 1:
The patent segments the management of multiple transmit antennas into independent per-node operations. Each node manages its own transmit antennas independently rather than as a centralized group, which reduces the overall management complexity while maintaining the data capacity benefits of multiple antennas across the multi-node system.
Solution Approach 2:
Each node autonomously determines its own precoding matrices based on its channel state information without requiring centralized coordination for matrix selection. This self-service approach reduces the complexity of managing multiple transmit antennas across nodes, as each node independently optimizes its transmission without burdening the overall system management.
3Device complexity
If per-node precoding matrices are used, then the number of MIMO precoding matrices is decreased, but feedback information overhead must be managed
Solution Approach 1:
The patent requires each node to provide feedback information specific to its local channel conditions for determining per-node precoding matrices. While this generates feedback overhead, it enables the system to use fewer overall matrices by optimizing each node's precoding independently based on local quality metrics, thereby reducing the total number of matrices needed in the system.
Data Source
AI summary
Provided is a signal transmission method of a multi-node system employing a plurality of nodes and a base station that can control each of the plurality of nodes. The method includes: transmitting per-node transmission information to a user equipment; transmitting at least one stream to the user equipment by applying a precoding matrix determined for each node in at least one node among the plurality of nodes; and receiving per-node feedback information from the user equipment, wherein the per-node feedback information includes information on a precoding matrix applicable to a node which transmits the at least one stream.