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FMCW Radar Network: Multiple Access and Interference Mitigation
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DOI：10.1109/JSTSP.2021.3071565.png)
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Abstract
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With the increasing proliferation of radars on vehicles, interference among vehicular radars is becoming a serious issue. In this work, we consider a frequency modulated continuous wave (FMCW) radar network with coherent radar interference where all radars adopt the same chirp slopes. Four asynchronous non-cooperative media access control (MAC) protocols are used for mutual radar interference mitigation. We propose two cross-layer performance metrics - multiple access capacity and probability of target misdetection to quantify the network performance under each MAC protocol. Based on our analysis and extensive simulations, we find the pure random access achieves a very poor trade-off between multiple access capacity and probability of target misdetection. However, such a trade-off can be significantly improved by frequency hopping and phase coding. This shows that proper MAC protocols can achieve very good performance even without synchronization and coordination. We describe new insights behind such gains that can be valuable for FMCW radar MAC design.
Keywords:
Interference
Chirp
Spaceborne radar
Discrete Fourier transforms
Radar detection
Radar signal processing
Media Access Protocol
FMCW radar
radar networks
MAC
interference detection and mitigation
interference modeling
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