Channel Capacity Analysis Of MIMO System

In the development of wireless communication technologies, multiple-input and multiple-output (MIMO) technology is a major breakthrough. It can wipe out the radio frequency resource constraint and greatly improving the spectral efficiency of wireless systems. Therefore it is considered to be the future trend of the development of wireless communication technologies. But, MIMO technology completely breaks the method of conventional wireless communications, because it requires plurality of transmit and receive antennas in order to simultaneously transmit and receive data information at the same time, all aspects of the challenges of wireless communications, including system architecture, analytical methods, modulation, coding, testing, channel estimation, multiple access, and so forth. On the basis current research works, this paper investigates MIMO channel capacity. Firstly, the author introduces the current study of MIMO, include the improvements which were received and the challenges which are facing to. Then, this article analysis the wireless channels, and describe the characteristic of MIMO channel and the models of MIMO channel. Secondly, it simulates several typical constant parameters of the spatial correlation of the channel and the channel affect the capacity of MIMO system. From the simulation, we can take the conclusion that MIMO system can effectively improve channel is decreased. Thirdly, it analyzes the capacity of STBC system, then comparison the capacity of MIMO system and STBC. Finally, this is a simulation of Orthogonal Frequency Division Multiplexing (OFDM), and discussed that the capacity of MIMO-OFDM system over frequency selective fading channels, then simulated the capacity of channel, but due to the impact of channel space correlation, the capacity of choice of multiple paths and channel space correlation on the capacity of MIMO-OFDM system.