Backscatter Reflector Reference Signals for Channel Estimation
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Solution Overview
Problem
Existing backscatter communication systems suffer from poor channel estimation performance due to reliance on data packet headers for channel estimation, leading to inefficient data demodulation.
Innovation Solution
Incorporating reference signals into excitation signals in backscatter communication, allowing for improved channel estimation by alternating the placement of reference and excitation signals in time domain resources, enabling accurate channel estimation and data demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel estimation is performed using preamble sequence of data packet header, then channel estimation can be performed, but channel estimation performance is poor
Solution Approach 1:
The patent segments the channel estimation function from data transmission by introducing separate reference signals. Instead of relying on preamble sequences embedded in data packets, the system divides resources to include dedicated reference signal transmissions that are specifically optimized for channel estimation, while data transmission occurs separately. This segmentation allows each function to be optimized independently, improving overall system performance.
Solution Approach 2:
The patent introduces reference signals as an intermediary element between the transmitter and receiver for channel estimation. These reference signals serve as a mediator that carries channel information without carrying data, allowing the receiver to estimate channel characteristics accurately. The reference signals act as a bridge that enables reliable channel estimation without compromising data transmission integrity.
2Measurement precision
If reference signals are carried in excitation signals, then channel estimation performance is improved, but interference from excitation signals increases
Solution Approach 1:
The patent employs periodic transmission of reference signals within the excitation signal structure. By periodically inserting reference signals at specific intervals rather than continuously transmitting them, the system maintains accurate channel estimation capability while reducing overall interference levels. The periodic nature allows the receiver to selectively process reference signal portions for estimation while filtering out other excitation signal components.
Solution Approach 2:
The patent applies local quality enhancement by concentrating reference signal energy in specific time-frequency resources within the excitation signal structure. Instead of uniformly distributing energy, the system places reference signals in localized regions where they can be efficiently detected and processed. This localized concentration improves channel estimation accuracy while limiting the spatial and temporal spread of interference.
Data Source
AI summary
This application provides a signal transmission method and apparatus, a reflector, and a receiver. In one example method, a reflector receives W excitation signals, where W exciters may be configured to carry data and a reference signal that are reflected by the reflector; and the reflector reflects data and L reference signals to a receiver, where the L reference signals are respectively carried in L excitation signals in the W excitation signals, where W and L are both integers greater than or equal to 1, and L is less than or equal to W.