Channel State Information via Doppler-Multiplexed Pilot Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of efficiently transmitting multiple pilot signals on a same time-frequency resource is exacerbated by increasing user quantities, leading to reduced utilization of data transmission resources.
Innovation Solution
Implementing orthogonal multiplexing of pilot signals in the Doppler domain by using phase shifts and Doppler basis information to ensure non-overlapping Doppler spreads, allowing multiple pilot signals to share the same time-frequency resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more pilot signals are sent to support increasing user quantities, then channel state information acquisition is improved, but resource utilization for data transmission deteriorates
Solution Approach 1:
The patent applies Doppler domain multiplexing to transmit multiple pilot signals on the same time-frequency resource by exploiting the Doppler dimension. Different pilot signals are assigned different Doppler basis vectors, enabling orthogonal multiplexing in the Doppler domain while maintaining the same time-frequency resources, thus improving channel state information acquisition without reducing data transmission resource utilization
Solution Approach 2:
The patent changes the Doppler parameter (Doppler basis assignment) to differentiate multiple pilot signals transmitted on the same time-frequency resource. By assigning different Doppler basis vectors to different pilot signals, the system enables multiple users to share the same time-frequency resources while maintaining distinguishable channel state information for each user
2Productivity
If multiple pilot signals share the same time-frequency resource through Doppler multiplexing, then resource utilization is improved, but signal distinction and measurement accuracy may deteriorate
Solution Approach 1:
The patent uses Doppler domain multiplexing to separate multiple pilot signals in the Doppler dimension while they occupy the same time-frequency resources. By assigning orthogonal Doppler basis vectors to different pilot signals, the system ensures that signals remain distinguishable and measurable with high accuracy despite sharing the same time-frequency resources
Solution Approach 2:
The patent replaces traditional time-frequency resource allocation with Doppler domain-based signal separation. Instead of allocating different time-frequency resources to different pilot signals, the system uses Doppler basis vectors to differentiate signals, substituting the mechanical resource allocation approach with a signal processing-based differentiation approach that maintains measurement precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the transmission of more pilot signals on a single time-frequency resource, enhancing channel state information acquisition without compromising data transmission efficiency.
Implementation Method 1
the second information indicates a Doppler basis corresponding to a channel of each of M antenna ports... the Doppler basis that corresponds to the channel of the antenna port and that is indicated by the second information is a Doppler basis corresponding to a received signal
Implementation Method 2
the M reference signals are determined based on a pilot signal and a phase shift of each of the M antenna ports
Data Source
AI summary
This application provides a channel state information obtaining method and a related apparatus. The method includes: obtaining first information and second information, where the first information indicates a quantity NT of time units, and the second information indicates a Doppler basis corresponding to a channel of each of M antenna ports; receiving, in each of the NT time units, M reference signals from a second device, where the M reference signals occupy a same time-frequency resource, the M reference signals are determined based on a pilot signal and a phase shift of each of the M antenna ports, and NT and M are integers greater than 1; and determining, based on the M reference signals and the second information, channel state information corresponding to each of the M antenna ports.