Same-Sequence Reference Signals for Sensing Blind-Zone Reduction
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Solution Overview
Problem
The integration of sensing and communication in wireless networks faces challenges due to sensing blind zones caused by interfering signals from different network devices, which disrupt coherent processing and create noise floors, leading to reduced sensing accuracy.
Innovation Solution
The method involves sending multiple reference signals with the same initial pseudo-random sequence values and time domain intervals less than one radio frame, concentrating interfering signals in a zero-velocity region to reduce the sensing blind zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If reference signals with different initial pseudo-random sequence values are used, then interference from other network devices is reduced, but sensing blind zones increase due to disrupted coherent processing
Solution Approach 1:
The patent applies homogeneity by configuring reference signals with the same initial pseudo-random sequence values across multiple network devices. This ensures that interfering signals maintain consistent characteristics within the coherent processing time, allowing them to be concentrated in the zero-velocity region rather than dispersed across the velocity spectrum, thereby reducing sensing blind zones while managing interference
Solution Approach 2:
The patent changes the parameter of initial pseudo-random sequence values from variable to fixed/same across network devices. By setting cinit to be identical for reference signals from different network devices within the same coherent processing time, the interfering signals become coherent and can be properly processed, reducing the sensing blind zone extent
2Measurement precision
If reference signals are sent with larger time domain intervals, then channel estimation accuracy is improved, but coherent processing time increases leading to larger sensing blind zones
Solution Approach 1:
The patent optimizes the time domain interval parameter between reference signals to be less than one radio frame. By adjusting this temporal parameter, the system achieves a balance where channel estimation remains accurate while the coherent processing time is constrained, preventing excessive expansion of sensing blind zones
Data Source
AI summary
Embodiments of this application disclose a signal sending method, including: sending a plurality of reference signals, where initial values of the plurality of reference signals are the same, and a time domain interval between any two adjacent reference signals in the plurality of reference signals is less than one radio frame; and receiving echo signals of the plurality of reference signals. Because initial values of pseudo-random sequences of a plurality of reference signals sent by a network device are all the same, interfering signals received by the network device from another network device within coherent processing time remain substantially unchanged within the coherent processing time. Interfering signals present after Fourier transform are concentrated in a zero-velocity region of a range-velocity spectrum, reducing an extent of a sensing blind zone.