DMRS Port Superposition for Low-Overhead Channel 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 inadequate channel estimation results.
Innovation Solution
The method involves superimposing multiple DMRS port signals with different delay segmentation locations on the same time-frequency resource, allowing for increased multiplexing of DMRS ports without additional pilot signaling overheads, enabling more accurate channel estimation by terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple DMRS port signals are multiplexed on the same time-frequency resource, then channel estimation accuracy is improved, but pilot signaling overhead increases
Solution Approach 1:
The patent combines multiple DMRS port signals on the same time-frequency resource by superimposing them with different delay segmentation locations, allowing multiple streams to share the same pilot resources without increasing overhead. This merging approach enables efficient use of pilot signals for multi-stream MIMO transmission.
Solution Approach 2:
The patent introduces delay segmentation location as an additional dimension for multiplexing DMRS ports. Instead of using only frequency or time domain separation, the invention utilizes delay domain segmentation to distinguish multiple DMRS ports, thereby increasing multiplexing capacity without additional pilot overhead.
2Quantity of substance
If a small quantity of DMRS port signals are sent on the same time-frequency resource, then pilot signaling overhead is reduced, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent changes the parameter of delay segmentation location for different DMRS ports, allowing multiple ports to be distinguished through parameter differentiation rather than requiring separate time-frequency resources. This parameter change enables maintaining low overhead while improving estimation accuracy.
3Productivity
If more streams are sent through increased DMRS port multiplexing, then communication performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the delay domain into different delay segmentation locations for different DMRS ports. This segmentation approach allows the receiver to separately process each DMRS port by extracting signals at specific delay locations, simplifying the overall processing complexity while enabling multi-stream transmission.
Data Source
AI summary
This application discloses a method for sending a demodulation reference signal. In the method, a network device generates a first signal and sends the first signal on a first time-frequency resource. The first signal is formed by superimposing M DMRS port signals, and the 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 amount time-frequency resources. In this way, the network device can send more streams without increasing signaling overheads.