With the rapid development of wireless communications, the significant changes have occurred in lots of different fields. But the quickly increasing of communication operations and the number of users made the limited wireless resource a huge challenge. So, multiple-input multiple-output (MIMO) communication techniques have been an important area of focus for next-generation wireless systems because of their potential for high capacity, increased diversity, and interference suppression.Making the most of spatial resource, MIMO systems can do well in withstanding wireless channel eclipse, enhance the system capacity and improve the performance, but they don't use more system bandwidth and transmitting power. For applications such as wireless LANs and cellular telephony, MIMO systems will likely be deployed in environments where a single base must communicate with many users simultaneously. As a result, the study of multi-user MIMO systems has emerged recently as an important research topic.Multi-user MIMO systems can make use of space-division multiple access to achieve higher channel capacity compared with single-user systems, since no extra time slots and frequency resources are needed to support more users. However, the number of simultaneously supportable users is limited by the number of transmit and receive antennas. Therefore, the base station practically must select the available subset with some useful multi-user selection algorithms. Otherwise, in order to ensure capacity performance or to satisfy QoS requirement (SINR, fairness etc.), scheduling is required to manage the users' access to the resources.
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