Signal waveforms and range/angle coupling in coherent colocated MIMO radar

Phase code optimization for coherent MIMO radar via a gradient descent

“…Results are promising, as the sidelobe level is around -28 dB. They are slightly better than what we get with a Gold code, [4] or with the usual method. Notice that the range cut at θ = 0 is equivalent to the autocorrelation of the signal diffused by the whole antenna (cf.…”

“…However, all these signals suffer from a range/angle coupling [4]. CDMA waveforms seem to present the best coupling, at the cost of high range sidelobe levels.…”

High Resolution FDMA MIMO Radar

“…In practice, it is difficult to find waveform families that perfectly satisfy all these demands [16]. Comprehensive evaluation and comparison of different types of MIMO radar waveforms is presented in [17], [18], [19]. The main waveform families considered are time, frequency and code division multiple access, abbreviated as TDMA, FDMA and CDMA, respectively.…”

“…More efficient schemes have been proposed, such as circulating MIMO waveforms [18]. However, this technique suffers from loss in range resolution [18], [19].…”

Cognitive sub-Nyquist hardware prototype of a collocated MIMO radar

“…In sub-Nyquist MIMO, the radar antenna elements are randomly placed within the aperture (see [11] for introduction and [3] for recent updates on random arrays), and signal orthogonality is achieved by frequency division multiplexing (FDM). In a conventional MIMO radar, the use of non-overlapping FDM waveforms results in a strong range-azimuth coupling [12][13][14] in the receiver processing, and therefore, it is common to use orthogonal code signals (i.e. code division multiplexing or CDM).…”