MIMO CSI Feedback Using Multi-Pilot Channel Measurement
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Solution Overview
Problem
The precision of channel state information feedback in MIMO technology is low due to discrete and limited quantization of precoding matrices, leading to a significant error between the precoding matrix determined by the network device and the actual channel.
Innovation Solution
The method involves sending N pilot signals on different CSI resources, allowing the terminal device to perform channel measurements on multiple CSI resources with distinct mapping relationships or inter-polarization phases, and the network device determines a precoding matrix based on the identified CSI resource and PMI, breaking the protocol limitation of existing codebooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If discrete and limited quantization of precoding matrices is used for CSI feedback, then feedback overhead is reduced, but feedback precision deteriorates
Solution Approach 1:
The patent changes the parameter of CSI feedback from discrete PMI indices to continuous complex-valued channel measurement results. By transmitting the actual channel measurement data (which includes amplitude and phase information) instead of quantized indices, the system achieves higher feedback precision while maintaining reasonable overhead through selective transmission of only necessary channel parameters.
2Quantity of substance
If a single CSI resource is used for channel measurement, then resource overhead is reduced, but channel measurement accuracy deteriorates
Solution Approach 1:
The patent segments the channel measurement process into multiple CSI resources, each associated with different pilot signals and mapping relationships. By dividing the measurement across multiple resources with different configurations (different antenna port mappings or inter-polarization phases), the system obtains multiple independent measurement results that can be combined to achieve higher overall measurement accuracy while controlling resource consumption.
Data Source
AI summary
A communication method includes receiving N pilot signals from a network device by using N channel state information (CSI) resources. The N CSI resources are in a one-to-one correspondence with the N pilot signals, N is an integer greater than or equal to 2, and the N pilot signals correspond to N mapping relationships between antenna ports of the network device and transceiver antennas of the network device, wherein at least two of the N mapping relationships between the antenna ports of the network device and the transceiver antennas of the network device are different, or the N pilot signals correspond to N inter-polarization phases, wherein at least two of the N inter-polarization phases are different. The method also includes performing channel measurement on the N CSI resources based on the corresponding pilot signals. The method further includes sending channel state information to the network device.