Radar Interference Mitigation in Cellular Communications
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Solution Overview
Problem
In wireless communication systems, the coexistence of data communication and radar sensing in the same frequency band leads to significant interference between data communication signals and radar sensing signals, making it difficult to decode uplink and downlink data due to low signal-to-interference-and-noise ratios.
Innovation Solution
Configuring radar transmitters and receivers to use non-overlapping resources, such as through a muting pattern, and tuning base stations to receive data signals from beams that do not collide with radar beams, while also incorporating reference signals for both data communication and radar sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data communication and radar sensing share the same frequency band, then spectrum utilization is improved, but interference between communication signals and radar signals increases
Solution Approach 1:
The frequency band is segmented into different resource sets: a first set of resources allocated for data communication and a second set of resources allocated for radar sensing. This segmentation allows both functions to operate simultaneously in the same frequency band without interference, as communication signals and radar signals are confined to their respective resource sets.
Solution Approach 2:
The system dynamically configures resource allocation between communication and radar sensing based on real-time requirements. The network can adjust which resources are assigned to communication versus radar, allowing flexible adaptation to changing traffic conditions and radar sensing needs while maintaining spectrum efficiency.
2Productivity
If radar signals are transmitted in the same frequency band as data communication, then bandwidth utilization is improved, but signal-to-interference-and-noise ratio deteriorates
Solution Approach 1:
Resources are divided into distinct sets for communication and radar operations. By assigning specific time-frequency resources exclusively to radar sensing and others to data communication, the system maintains high bandwidth utilization while preventing interference that would degrade signal quality and reduce reliability.
Solution Approach 2:
The network introduces an intermediary resource allocation mechanism that mediates between communication and radar requirements. This intermediary layer assigns resources and coordinates transmissions to ensure both functions operate effectively without mutual interference, maintaining both bandwidth utilization and signal quality.
3Measurement precision
If base stations use beamforming for both communication and radar, then directional precision is improved, but beam collision between communication and radar increases
Solution Approach 1:
Beam resources are segmented into different sets for communication and radar operations. The network configures base stations to form communication beams and radar beams using different spatial resources or time slots, allowing both functions to achieve high directional precision without beam collision that would cause interference.
Solution Approach 2:
The system dynamically adjusts beam configurations based on real-time spatial and temporal conditions. When communication and radar operations are scheduled, the network optimizes beam directions and timing to prevent collision, maintaining directional precision for both functions while avoiding harmful interference.
Data Source
AI summary
Methods of reducing the interferences of radar signals with uplink or downlink data communication signals in a wireless system for both data communication and radar sensing may include configuring the transmitters of the radar signals and the data communication signals such that the data communication signals and the radar signals are transmitted using different radio frequency resources, and/or configuring the receivers of the data communication signals to receive the data communication signals using a receive beam that does not collide with radar beams. The methods may also include using a reference signal for both downlink data communication and radar sensing and/or determining a Quasi-Colocation (QCL) configuration for downlink data reception based on information regarding a radar beam.