Performance of the MIMO MC-CDMA system with beamforming

Abstract

The quality of a wireless link can be described by three basic parameters, namely transmission rate, transmission range and transmission reliability. With the advent of multiple-input multiple-output (MIMO) assisted Multicarrier code division multiple access (MC-CDMA) systems, the above-mentioned three parameters may be simultaneously improved. The MC-CDMA combined with the MIMO technique, has become a core technology for future mobile radio communication system. However, possible potential gain in spectral efficiency is challenged by the receiver's ability to accurately detect the symbol due to inter symbol interference (ISI). Multipath propagation, mobility of transmitter, receiver and local scattering cause the signal to be spread in frequency, different arrival time and angle, which results in ISI in the received signal. This will affect overall system performance. The use of MC-CDMA mitigates the problem of time dispersion. However, still it is necessary to remove the amplitude and phase shift caused by channel. To solve this problem, a multiple antenna array can be used at the receiver, not only for spectral efficiency or gain enhancement, but also for interference suppression. This can be done by the beam forming, efficient channel estimation with strong equalization. This paper proposes MIMO MC-CDMA system with beamforming, Minimum mean square error (MMSE) equalization with ideal channel estimation. The simulation result shows improved BER performance when the sub carrier (SC) and antenna configuration was increased.