**5. Conclusions**

This chapter offers a comprehensive overview of the localization techniques proposed in wireless MIMO communication systems in sub-6 GHz and mmWave frequency bands. Initially, the need for highly accurate positioning systems is introduced along with some applications in LBS. Subsequently, the wireless communication parameters that define the propagation within the MIMO channel model are introduced. This is followed by a discussion on several localization techniques in MIMO systems including map-assisted, CS based, and fingerprinting models. This chapter explains how each localization technique uses wireless communication parameters to localize the UE. Finally, the last section outlines the remaining challenges and possible opportunities for improvement on MIMO localization.
