DMRS Port Multiplexing with Delay Segmentation for MIMO Estimation
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Solution Overview
Problem
Current MIMO systems face low channel estimation accuracy due to the limited number of DMRS port signals sent on the same time-frequency resource, leading to inaccurate channel estimation results.
Innovation Solution
Increase the number of multiplexed DMRS ports on the same time-frequency resource by using different delay segmentation locations for the DMRS port signals, allowing more streams without increasing pilot signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the base station sends a small quantity of DMRS port signals on a same time-frequency resource, then the pilot signaling overhead is reduced, but the channel estimation accuracy deteriorates
Solution Approach 1:
The patent introduces a new dimension for multiplexing DMRS ports by using different delay segmentation locations in the delay domain. Instead of only using frequency or time domain resources, the invention maps different DMRS ports to different delay segmentation locations, effectively adding a new dimension for resource allocation. This allows more DMRS ports to be multiplexed on the same time-frequency resource without increasing pilot signaling overhead, thereby improving channel estimation accuracy while maintaining low overhead.
Solution Approach 2:
The patent changes the parameter of delay segmentation location to differentiate and multiplex multiple DMRS ports. By assigning different delay segmentation locations to different DMRS ports, the system can support more ports on the same resource. This parameter change enables the base station to send a larger quantity of DMRS port signals without increasing the overall pilot overhead, thus resolving the contradiction between quantity and accuracy.
2Measurement precision
If more DMRS ports are multiplexed on the same time-frequency resource, then the channel estimation accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the delay domain into different delay segmentation locations and assigns different segments to different DMRS ports. This segmentation approach allows the receiver to separately process each DMRS port by identifying its specific delay segmentation location. The segmentation reduces processing complexity compared to other multiplexing methods because each port can be independently identified and processed without complex interference cancellation, thus improving channel estimation accuracy while limiting the increase in device complexity.
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
Enhances channel estimation accuracy by providing more reference signal streams, improving the channel estimation performance.
Implementation Method 1
the first signal is formed by superimposing the M DMRS port signals
Implementation Method 2
delay segmentation locations corresponding to at least two of the M DMRS port signals are different
Data Source
AI summary
A method for sending a demodulation reference signal includes: a network device generates a first signal and sends the first signal on a first time-frequency resource, where the first signal is formed by superimposing M DMRS port signals, and delay segmentation locations corresponding to at least two of the M DMRS port signals are different. Because the first signal is formed by superposing the M DMRS port signals, that is, the network device sends a plurality of DMRS port signals on a same time-frequency resource, reference signal overheads can be reduced. The network device can send more DMRS port signals using the same time-frequency resource. In this way, the network device can send more streams without increasing pilot overheads.