Transmit Beamspace DDMA Based Automotive MIMO Radar

Feng Xu, Sergiy A. Vorobyov, Fawei Yang

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The time division multiple access (TDMA) technique has been applied in automotive multiple-input multiple-output (MIMO) radar. However, it suffers from the transmit energy loss, and as a result the parameter estimation performance degradation when the number of transmit elements increases. To tackle these problems, a transmit beamspace (TB) Doppler division multiple access (DDMA) approach is proposed. First, a phase modulation matrix with empty Doppler spectrum is introduced. By exploiting the empty Doppler spectrum, a test function based on sequential detection is developed to mitigate the Doppler ambiguity in DDMA waveform. Then, a discrete Fourier transform (DFT)-based TB in slow-time is formed. The proposed method can achieve waveform diversity in Doppler domain and generate a TB in slow-time that concentrates the transmitted power in a fixed spatial region to improve the transmit energy distribution for automotive MIMO radar, which is favored by medium/long range radar (MRR/LRR) applications. As compared to the conventional TDMA technique, the proposed TB DDMA approach can fully exploit the transmission capabilities of all transmit elements to ensure that the emitted power is efficiently used and inherits easy implementation. Moreover, the proposed TB DDMA method avoids the trade-off between the active time for each transmit antenna element and the frame time due to Doppler ambiguity mitigation. Simulation results verify the effectiveness of the proposed TB DDMA approach for automotive MIMO radar.

Original languageEnglish
JournalIEEE Transactions on Vehicular Technology
DOIs
Publication statusE-pub ahead of print - 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Automotive engineering
  • Automotive MIMO radar
  • Doppler ambiguity mitigation
  • Doppler effect
  • Doppler radar
  • MIMO radar
  • Radar antennas
  • TB DDMA
  • TDMA
  • Time division multiple access
  • Transmitting antennas

Fingerprint

Dive into the research topics of 'Transmit Beamspace DDMA Based Automotive MIMO Radar'. Together they form a unique fingerprint.

Cite this