Study On Performance Of Linear Orthogonal STBC Over MIMO Correlated Nakagami-m Fading Channel

With the integration of the Internet and multimedia applications in wireless communications, the requirements of high-speed broadband communications services are also increasing. However, the available frequencies is limited. The wireless transmission system wants to transmit high-speed data streams without increasing the bandwidth.Space-time coding(STC) technology as a new encoding method to resistance to channel fading and improve system capacity. And the combination of Space-time coding(STC) techniques with multi-input multi-output(MIMO) technology is considered to be an effective solution. By achieving high data transfer rate to improve the spectrum utilization significantly in broadband communication systems, the Space-time coding techniques are increasingly being used to improve the calculation of the data transmission and broadband wireless channel.Although compared with non-correlated fading channel, signal quality in correlated fading channel is much worse, in the actual propagation environment, physical constraints couldn’t make the antenna spacing achieving the independent fading distance between the antenna elements, that’s why we can not avoid the situation of correlated fading.This paper introduces the wireless propagation environment, MIMO channel models, and the three common fading channel models firstly. Then we introduce the basic theory of the Space-time block coding(STBC) technology, and describe the relevant system and channel model with the Space-time block coding(STBC) techniques using in Nakagami-m fading channels. And derive the closed expression of the spatial cross-correlation function for the mobile non-frequency selective multi-input multi-output(MIMO)of the Nakagami-m fading channels, with a small angle of arrival spread(AOA). In this expression, we consider the various parameters, such as the average angle of arrival(AOA) of the signal, the spread of the average arrival angle and the array structure. Then we analyze the BER performance of linear STBC based on MPSK and MQAM modulation schemes over generalized MIMO fading channels. The general expressions are particularized for the case of correlated identically distributed Nakagami-m fading channels. We also derive the BER expressions for both integral and nonintegral Nakagami-m fading parameters, starting from the moment-generating function (MGF) of the multi-path component signals at the antenna array elements. At last, we present the corresponding simulation results, and analyze the effects of the antenna array structure and operating environment (the average angle of arrival(AOA) of the signal, the spread of the average arrival angle) on the BER performance of linear space-time block codes in different Nakagami-m fading channels...