Communication System Radar Interference Mitigation
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Solution Overview
Problem
The challenge is to mitigate mutual interference between radar systems and communication networks, particularly in scenarios where radar systems transmit with high power levels and low duty cycles, limiting the effectiveness of spectrum sharing due to large exclusion zones.
Innovation Solution
The proposed solution involves identifying and adjusting transmission parameters, such as modulation schemes and forward error correction rates, based on signal-to-interference-plus-noise ratios and dwell times of radar pulses, to optimize communication network operations during interference periods, and opportunistically scheduling transmissions during radar off-times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If radar systems transmit with high power levels, then radar detection capability is improved, but exclusion zone size increases limiting spectrum sharing
Solution Approach 1:
The communication system dynamically adjusts transmission parameters (modulation scheme, coding rate, power) based on real-time radar interference conditions. The system transitions between different transmission modes (affected vs. non-affected TTIs) to adapt to the time-varying interference environment, enabling spectrum sharing without requiring fixed large exclusion zones
Solution Approach 2:
The system changes transmission parameters including modulation order, coding rate, and power levels according to the detected radar pulse patterns and interference levels. By adjusting these parameters, the system can maintain reliable communication in the presence of high-power radar transmissions, effectively reducing the need for large exclusion zones
2Productivity
If communication networks operate in spectrum shared with radar, then spectrum utilization is improved, but transmission reliability deteriorates due to interference
Solution Approach 1:
The system performs preliminary detection of radar pulse patterns and predicts future interference periods. By identifying affected transmission time intervals in advance, the system can proactively adjust transmission parameters or schedule transmissions during non-affected periods, preventing interference-related failures before they occur
Solution Approach 2:
The system continuously monitors the received signal quality and detects radar interference patterns. Based on this feedback, it dynamically adjusts transmission parameters for subsequent TTIs to maintain reliable communication. The system uses measured SINR values and detected pulse patterns to make real-time decisions about parameter adjustments
3Object-affected harmful factors
If transmission parameters are adjusted frequently to avoid interference, then interference mitigation is improved, but system complexity increases
Solution Approach 1:
The system exploits the periodic nature of radar pulse transmissions by detecting and learning the radar pulse patterns. Instead of continuous complex adjustments, the system identifies periodic interference patterns and applies predetermined parameter adjustments for affected TTIs, simplifying the control logic while maintaining effective interference mitigation
Data Source
AI summary
A method for coexistence with a pulsed interference source in a communications network includes receiving a communications signal, determining a first portion of the communications signal that is affected by the pulsed interference source, blanking the first portion of the communications signal, and processing the communications signal.