Investigate of training based channel estimation for a MIMO-OFDM system over different modulation technique / Nadiatul Akmal Kamaralzaman

Orthogonal Frequency Division Multiplexing (OFDM) in communications systems combine with Multiple-Input Multiple-Output (MIMO) can improve capacity and achieve high data rate. In OFDM communications systems, the system performance will be cause to Inter-symbol Interference (ISI). Therefore, the pilot arrangement which is the Training Based Channel Estimation are used and applied at Least Square Channel Estimation (LSE) to eliminate the ISI; accurate channel state information (CSI) is required at the receiver to improvement the performance. Thus, the objective of this paper is investigation of Training Based Channel Estimation for MIMO-OFDM system in communication system to reduce inter-symbol interference (ISI) in order to estimates the channel information and to analyze the performance, the different digital modulation such as Quadrature Amplitude Modulation (QAM), Phase Shift Keying (PSK) and different number of pilot. The basic principles of MIMO-OFDM system are introduced and realization, the system model with some key technologies such as Fast Fourier Transform (FFT), and cyclic prefix (CP) were described. The simulation results presented by using Software MATLAB Programming and have been evaluated in term of signal-to-noise ratio, SNR versus bit error rate, BER. It has been concluded, if BER is low, means achieves in estimate error and enhance the performance of MIMO-OFDM system in communication system.