Performance analysis of time division and code division waveforms in co-located MIMO

Multiple Input Multiple Output (MIMO) beamforming holds much promise as a concept appropriate for a variety of radar applications. In this paper, MIMO beamforming is examined both theoretically and experimentally in order to highlight fundamental differences in performance between the time division and the code division forms of multiplexing (TDM and CDM). There are significant differences in system performance due to limits on the orthogonality of waveforms that occur when using CDM. These limits are manifested in the peak-to-mean sidelobe correlation ratio, resulting in extended range sidelobes.