Channel Estimation via Joint Reference Signal Reception
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Solution Overview
Problem
In LTE systems, increasing radio resource overheads to achieve better channel estimation leads to reduced throughput due to the need for more time-frequency resources for demodulation reference signals.
Innovation Solution
A method where a network device receives a first reference signal according to a first pattern and a second reference signal according to a second pattern, with both patterns indicating time-frequency resource distribution, when the precoding weights are the same, optimizing channel estimation while reducing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more time-frequency resources are allocated to transmit demodulation reference signals for better channel estimation, then channel estimation accuracy is improved, but radio resource overhead increases and system throughput decreases
Solution Approach 1:
The patent combines channel estimation for two different time units into a single joint estimation process. When precoding weights are identical across time units, the network device receives reference signals from both time units and performs unified channel estimation, thereby improving estimation accuracy without proportionally increasing resource overhead. This merging approach allows the system to achieve better channel estimation performance while maintaining higher throughput compared to separate estimation methods.
2Measurement precision
If more time-frequency resources are allocated to transmit reference signals, then channel estimation effect is optimized, but radio resource overheads are increased
Solution Approach 1:
The patent enables reference signals to serve multiple functions simultaneously. The same reference signals transmitted in one time unit are utilized for channel estimation in both the first and second time units when precoding weights are consistent. This multi-functional use of reference signals optimizes channel estimation effect while minimizing the quantity of radio resources required, as the same signals provide estimation benefits across multiple time units rather than requiring separate dedicated signals for each time unit.
Data Source
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AI summary
This application discloses a channel estimation method, a reference signal sending method, an apparatus, and a system, and belongs to the communications field. The method includes: when a first precoding weight of a first reference signal and a second precoding weight of a second reference signal are the same, receiving, by a first network device, the first reference signal in a first time unit according to a first pattern, and receiving the second reference signal in a second time unit according to a second pattern; and performing, by the first network device, channel estimation on a channel in the second time unit based on the first reference signal and the second reference signal. This resolves a problem that radio resource overheads are increased and a throughput of a communications system is reduced because more resources are used to send reference signals to obtain a better channel estimation effect, optimizes a channel estimation effect, reduces the radio resource overheads, and improves performance of the communications system.