Joint Radar Target Detection and Parameter Estimation with MIMO OTFS

Hybrid Digital-Analog Beamforming and MIMO Radar with OTFS Modulation

“…1b. Assuming that P targets are detected and their respective AoA are estimated, we construct F by replacing θ i by φp for the first P columns in (12) [4, Section III.B].…”

“…Contrary to the transmit beamforming matrix, the reduction matrix U at the radar Rx remains the same for both detection and tracking phases. Namely, we set U = F H , where each column is given in (12). This is illustrated in Fig.…”

“…As an extension of our previous works [11], [12], this paper studies the joint target detection and parameter estimation problem with a mono-static MIMO radar adopting orthogonal time frequency space (OTFS), i.e., a multi-carrier modulation proposed in [13] and already studied in different MIMO configurations (see, e.g., [14], [15]). The use of communication waveforms for radar has been motivated by the joint radar and communication paradigm, where two functions are implemented by sharing the same resources and the same waveform (see e.g.…”

“…[16], [17], [18] and references therein). Contrary to the existing works on radar sensing using OTFS [11], [12], [19], this paper considers MIMO radar under a practical mmWave system architecture such that the number of radio frequency (RF) chains (N rf ) is much smaller than the number of antennas (N a ). In fact, it is difficult to implement a fully digital BF, or, equivalently, associate one RF chain per antenna (including A/D conversion, modulation, and amplification) in a small form factor and highly integrated technology over a large signal bandwidth.…”

“…Note that the proposed algorithm could be able to correctly distinguish more targets sharing the same angular direction, if separated in at least one other domain (Doppler or delay)[12] 6. Note that a tradeoff appears.…”