Grouped Reference Signals for MIMO Channel Matrix Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In large-number MIMO communication systems with numerous transmit and receive antenna pairs, the transmission/reception time difference between reference signals leads to inaccurate channel matrix acquisition due to channel variations, hindering the system's ability to maintain effective spatial multiplexing and transmission capacity.
Innovation Solution
The system divides multiple spatial channels into groups, allowing the transmitter to transmit reference signals in a time-division manner for each group, enabling the receiver to acquire channel transfer functions for each group in multiple sequences, thereby reducing the transmission/reception time difference and maintaining accurate channel matrices, which are updated using tracking algorithms like LMS or RLS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If reference signals are transmitted in a time-division manner for all antenna pairs to acquire a complete channel matrix, then the channel matrix acquisition area is expanded to cover all spatial channels, but the transmission/reception time difference increases causing channel variations that reduce measurement precision
Solution Approach 1:
The patent divides the large-number MIMO system into multiple groups, where each group contains a subset of transmit and receive antennas. Reference signals are transmitted only within each group, creating multiple smaller channel matrix acquisition areas. This segmentation reduces the time difference for reference signal transmission within each group, minimizing channel variations and maintaining measurement precision while still covering all spatial channels across multiple groups.
2Productivity
If the number of transmit and receive antenna pairs is increased to expand transmission capacity, then spatial multiplexing capacity is enhanced, but the transmission/reception time difference for reference signals increases leading to channel variations
Solution Approach 1:
The patent segments the large-number MIMO system into multiple groups, each with a manageable number of antenna pairs. This allows the system to maintain high transmission capacity by utilizing all antenna pairs across groups while ensuring that reference signal transmission within each group occurs over a sufficiently short time period, preventing channel variations from degrading spatial multiplexing effectiveness.
Solution Approach 2:
The patent performs channel matrix acquisition for each group separately before combining results. By acquiring channel information for smaller groups first, the system ensures accurate channel matrices are obtained under stable channel conditions, then combines these to form the complete channel matrix for the entire large-number MIMO system, maintaining reliability while achieving high capacity.
Data Source
AI summary
Disclosed is a wireless communication system which carries out spatial multiplexing communication forming multiple spatial channels between a pair of a transmitter with multiple antennas and a receiver with multiple antennas, having the transmitter and the receiver. In the system, the multiple spatial channels are divided into one or more groups, the transmitter transmits reference signals corresponding to spatial channels in succession in a time-division manner for each group, and the receiver acquires a channel matrix whose column vectors are transfer functions of the spatial channels obtained from the reference signals for each group and spatially demultiplexes a receive signal using a receive weight obtained based on the channel matrix.