Signal Quality-Based Time Slot Selection for Co-Channel Radar
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Solution Overview
Problem
In wireless communication systems, particularly at millimeter wave frequencies, the limited number of digital chains leads to challenges in simultaneous operation of radar and communication due to inter-system interference and insufficient RF isolation, making concurrent operation of radar and communication systems infeasible.
Innovation Solution
Utilization of wireless communication reference signal measurement resources for co-channel radar operation by identifying candidate time slots for radar and communication based on signal quality measurements, enabling separate time slots for radar and communication operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radar and communication systems operate simultaneously on the same frequency band, then spectral efficiency is improved, but inter-system interference increases making concurrent operation infeasible
Solution Approach 1:
The patent segments the time domain into distinct time slots, allocating specific slots for radar operations and others for communication operations. This temporal segmentation allows both systems to share the same frequency band without simultaneous interference, resolving the contradiction between spectral efficiency and interference avoidance
Solution Approach 2:
The patent implements periodic time slot allocation where radar and communication operations alternate in a structured manner. By using periodic action with different duty cycles for radar and communication, the system achieves co-channel operation while maintaining acceptable performance for both functions
2Adaptability or versatility
If the number of digital chains is increased to support more antenna elements, then beamforming capability is improved, but hardware constraints make this infeasible
Solution Approach 1:
The patent divides the antenna array into multiple sub-arrays, each controlled by a separate digital chain. This segmentation allows a limited number of digital chains to control a larger total number of antenna elements, improving beamforming capability without requiring a proportional increase in digital chains
Solution Approach 2:
The patent transitions from a single-dimensional beamforming approach to a multi-dimensional approach by combining analog beamforming within sub-arrays and digital beamforming across sub-arrays. This dimensional expansion allows effective control of large antenna arrays with limited digital chains
Data Source
AI summary
A method includes obtaining a first set of signal quality measurements (SQMs) from among a plurality of reference signals received at an electronic device. The SQMs correspond to reference signals, respectively. The reference signals correspond to candidate time slots (CTS), respectively. The method includes identifying a first set of reference signals in the plurality of reference signals based on the first set of SQMs satisfying a first quality condition. The method includes identifying a second set of reference signals in the plurality of reference signals based on the first set of SQMs satisfying a second quality condition. The method includes identifying, as first CTS for an electronic device to use for a radar operation, candidate time slots corresponding to the first set of reference signals. The method includes identifying, as second CTSs for the electronic device to use for wireless communication, CTSs corresponding to the second set of reference signals.