Abstract
In this paper, a new technique which enables communication data to be embedded into multiple-input multiple-output (MIMO) radar waveforms is presented. A linear frequency modulated (LFM) signal is used for radar sensing, and multiple phase-shift keying (PSK) symbols or bit sequences are embedded into the LFM signal for communications. Such waveforms are subsequently used for radar sensing with MIMO beamforming. Orthogonality between transmitters is ensured using either a time-division multiplexing (TDM) or code-division multiplexing (CDM) approach. The performance of these novel techniques is demonstrated through both simulation and experimentation.
Highlights
A DVANCED driver assistance systems (ADAS) have been developed by placing multiple sensors around vehicles in order to aid the human driver when driving and parking
For the first time, we investigate, analytically and experimentally, the feasibility of multiple-input multiple-output (MIMO) phase-shift keying (PSK) modulated linear frequency modulated (LFM) waveform dual-function system, where vehicular communication data are embedded into radar waveforms using PSK symbols without significant degradation of radar detection or beamforming performance
The achievable data rate depends on the sub-unit duration, the sweep time, the pulse repetition interval (PRI), the size of the PSK constellation and the number of transmitters operating, which in its turn depends on waveform orthogonality
Summary
A DVANCED driver assistance systems (ADAS) have been developed by placing multiple sensors around vehicles in order to aid the human driver when driving and parking. In [28] this was extended into the MIMO radar concept by embedding one PSK symbol in each orthogonal waveform This technique achieves very low data rates. For the first time, we investigate, analytically and experimentally, the feasibility of MIMO PSK modulated LFM waveform dual-function system, where vehicular communication data are embedded into radar waveforms using PSK symbols without significant degradation of radar detection or beamforming performance. A message is embedded into an LFM signal using PSK in a TDM implementation and an m-sequence or Barker code is utilized to embed signals into an LFM waveform in a CDM case These methods are compared, through both simulation and experimentation to assess their radar and communication performance.
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