ABSTRACT
Multiple Input and Multiple Output (MIMO) systems have important applications in wireless communication systems, such as WiFi and WiMax systems. It is due to the fact that it has been shown that the capacity of a MIMO system is proportional to the minimum of the transmitting and receiving antennas in Teletar (1995), Foschini & Gans (1998), which is due to the fading characteristics of a wireless channel. In contrast, although MIMO radar concept has been recently attracted much attention in both signal processing and radar communities, see for example in Rabideau&Parker (2003), Bliss&Forsythe (2003), Robey et al. (2004), Fishler et al. (2006), its fundamental limit in our opinion is not clear yet (for multiple transmit antennas). This is because in wireless communications, fading is due to the superposition of reflected multi-paths from various reflectors and we are NOT interested in reflectors but in transmitting signals. While in radar applications, we are NOT interested in transmitting signals, but interested in reflectors and thus the MIMO advantage (spatial diversity) of a MIMO (multiple transmit antennas) system in combating fading in wireless systems is not clear in radar systems although it has been claimed in some MIMO radar literature under various assumptions. Penetrating obstacle such as walls using electromagnetic waves oers a powerful tool for both military and civilian applications including through-wall target detection and rescue. The application of MIMO radar can significantly increase the signal-to-clutter ratio (SCR) and image resolution. The mathematical theory of MIMO radar is critical
to decide the geometry for multiple radar transmitters and receivers in order to obtain clear images.
