Shannon theory has been crucial to develop simplified wireless communication systems which are forced to have a number of strict assumptions such as hard limitation on inter-user interference. For the simplified communication systems, it has been revealed that the throughput performance of the system can be unbelievably close to the theoretical bound provided by the Shannon theory. However, communication researchers recently found that it is necessary to evolve the original Shannon theory to analyze emerging complex wireless communication systems. Intermediate examples of complex wireless communication systems are the MIMO and MU-MIMO systems and the regular example is the cooperative relay system, where to find the optimal performance, the former systems require the reasonable update of t