Our Research on Radar with Integrated Communications

(Long-range) Radar with Integrated Communications

Exploit powerful radar infrastructure to provide almost unparalleled communication links that current systems, such as VHF radio and satellite, can hardly provide. Embed information to conventional radar waveforms, such as pulsed and FMCW radar signals, or more advanced ones such as frequency hopping (FH) and frequency agile radars. Such systems are generally known as dual function radar-communication systems (DFRC)

This video provides a short introduction to our work on integrating communication into frequency-hopping MIMO radar, by Dr. Kai Wu.

Communication Signal Reception for Frequency-hopping (FH) DFRC

FH-MIMO DFRC enables communication symbol rate to exceed radar pulse repetition frequency, which requires accurate estimations of timing offset and channel parameters. The estimations, however, are challenging due to unknown, fast-changing hopping frequencies and the multiplicative coupling between timing offset and channel parameters. We are studying novel signal processing techniques for communication receivers in FH-MIMO DFRC systems.

Main Publications:

Kai Wu, J. Andrew Zhang, Xiaojing Huang, Y. Jay Guo, and Robert W. Heath Jr., “Waveform Design and Accurate Channel Estimation for Frequency-Hopping MIMO Radar-based Communications”, IEEE Trans. On Communications
Kai Wu, J. Andrew Zhang, Xiaojing Huang, Y. Jay Guo, Jinhong Yuan, “Reliable Frequency-Hopping MIMO Radar-based Communications with Multi-Antenna Receiver”, IEEE Trans. On Communications

Secure Communications in FH-MIMO DFRC Systems

FH-MIMO DFRC, where radar, besides detecting targets, also performs downlink communication through an LoS link with a legitimate user named Bob. Meanwhile, there is an unintended user Eve who eavesdrops on the communication between radar and Bob. We propose novel baseband waveform processing highlighted on the left of the above figure to ensure a secure communication by scrambling constellations omni-directionally. The proposed demodulation scheme, as highlighted on the right, can recover constellations at Bob to achieve high-speed data communications.

Kai Wu, J. Andrew Zhang, Xiaojing Huang, Y. Jay Guo, “Integrating Secure and High-Speed Communications into Frequency Hopping MIMO Radar”, IEEE Trans. on Wireless Communications, accepted for publication, Dec. 2021

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