Abstract
Multiple-input multiple-output (MIMO) radar has supe- rior performance to conventional one. It has been introduced to almost every application fleld of conventional radar in recent years. In prac- tical application, MIMO radar also faces the problem of congested spectrum assignment, which makes it not possible to have a continu- ous clear band with large bandwidth. Sparse frequency waveform that contains several individual clear bands is a desirable solution to this problem. In this paper, we propose a method to design sparse fre- quency waveform set with low sidelobes in autocorrelations and cross- correlations by optimizing an objective function constructed based on Power Spectrum Density requirement and sidelobe performances of waveform set. Thus, besides the property of approximate orthog- onality, the designed waveforms obtain the ability of avoiding spec- trum interference to/from other users. The waveform is phase-coded and thereby has constant modulus. The efiectiveness of the proposed method is illustrated by numerical studies. Practical implementation issues such as quantization efiect and Doppler efiect are also discussed.
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