MIMO Channel State Information Estimation Using Measure Assignment Models
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Solution Overview
Problem
In wireless communication systems, especially in MIMO links, the lack of proper dual antenna sounding results in partial channel state information, limiting spatial multiplexing and system capacity due to fewer transmitting antennas compared to receiving antennas, leading to incomplete channel knowledge at network nodes.
Innovation Solution
A method to estimate richer channel state information by obtaining partial CSI from a reference signal and using measure assignment models to extrapolate information for all propagation channels between receiving and transmitting antennas, even those that did not actively transmit the reference signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fewer transmitting antennas are used compared to receiving antennas, then device complexity is reduced, but channel state information completeness deteriorates
Solution Approach 1:
The patent creates virtual copies of channel state information by using measure assignment models to estimate channel characteristics for transmitting antennas that did not actually transmit reference signals. The network node generates full MIMO channel state information (N×M matrix) by copying and extrapolating from the partial information obtained from X transmitting antennas, thereby compensating for the reduced number of physical transmitting antennas.
2Measurement precision
If partial channel state information is used, then measurement precision is reduced, but system overhead is decreased
Solution Approach 1:
The patent transforms partial channel state information (N×X matrix) into complete channel state information (N×M matrix) by changing the parameters of the information structure. Measure assignment models are used to assign measures (channel characteristics) to propagation channels between receiving antennas and transmitting antennas that did not transmit reference signals, thereby expanding the information from partial to complete without requiring additional physical measurements.
3Loss of information
If antenna switching is used for dual antenna sounding, then channel information completeness is improved, but transmit power loss increases
Solution Approach 1:
The patent performs preliminary channel sounding using a subset of transmitting antennas (X antennas out of M total) before actual data transmission. By using measure assignment models to pre-estimate the channel state for all M transmitting antennas based on the sounding from X antennas, the system avoids the need for antenna switching during data transmission, thereby preventing transmit power loss while still achieving complete channel information.
Data Source
AI summary
A method for estimating Multiple Input Multiple Output, MIMO, channel state information for a radio link between a first radio node including a number N, N≥2, of receiving antenna ports and a second radio node including a number M, M≥2, of transmitting antenna ports. The method includes obtaining partial channel state information from a reference signal transmitted by a number X, 1≤X<M, of said transmitting antenna ports and received by all of said receiving antenna ports, said partial channel state information providing a measure for the N×X propagation channels between all of said receiving antenna ports and said transmitting antenna ports. Also disclosed are corresponding devices and computer programs. Also disclosed is a method for controlling transmission based on estimated channel state information.