Multiuser MIMO Downlink System Capacity Analysis In Wireless Communication for Time Varying Channel

Very few technologies have shown as much impact on the trajectory of evolution of wireless communication systems as multiple input multiple output (MIMO) systems. MIMO systems have already been employed in the existing 802.11n and 802.16e standards resulting in a huge leap in their achievable rates. A relatively recent idea of extending the benefits of MIMO systems to multi-user scenarios seems promising in the context of achieving high data rates keeping in the mind for future cellular standards after 3G. For applications such as wireless LANs and cellular telephony, MIMO systems will likely to be deployed in environments where a single base station must communicate with many users simultaneously. As a result, the study of multi-user MIMO systems has emerged recently as an important topic for research in future. Such systems have the potential to combine the high capacity that can be achieved with MIMO processing by using space-division multiple access techniques This paper aims at giving an insight into Multiuser MIMO downlink systems—its concept, capacity, and transmission techniques related issues. In this paper several approaches including linear and non-linear channel precoding are reviewed which analyze the capacity for multiuser MIMO downlink channel. We conclude by describing future areas of research in multi-user MIMO