Cooperative communications with partial channel state information in mobile radio systems Future 4G mobile radio cellular networks are considered OFDM MIMO systems. Cooperative communication based on coordinated base stations is a very promising concept to perform inter cell interference management. This thesis deals with the concept of cooperative communication from its information theoretic background to its practical system design. The main focus is a practical design of the joint detection scheme in the uplink and the joint transmission scheme in the downlink with partial channel state information (CSI) i.e. significant CSI and imperfect CSI.