| dc.description.abstract | Comparison of bit error rate (BER) performance of single input single output (SISO), multiple input single output (MISO), and multiple input multiple output (MIMO) systems based on orthogonal space time block coding (OSTBC) and extended orthogonal space time block coding (EO-STBC) techniques, over flat fading channel, is addressed. The antenna configurations of MIMO system used in LTE and WiMAX, supports up to four antennas at either the transmitter, receiver, or both. Therefore, the comparison of BER performance of SISO, MISO and MIMO systems are a subject of this paper. The implementation of open loop SIMO and MIMO are based on OSTBC technique. Whereas, the implementation of closed loop SIMO and MIMO are based on EO-STBC technique. Losing the orthogonality decreasing the spatial diversity order. To achieve full spatial diversity order, closed loop (feedback) is used. The MATLAB simulation results confirm that, when the transmitted signals are fully orthogonal as in the system based on OSTBC (Alamouti) scheme, the system achieves full spatial diversity order which means that the best BER performance is reached. In contrast, when the transmitted signals are not fully orthogonal as in the system based on open loop EO-STBC scheme, the system can not reach full spatial diversity order which means that the worst BER performance is recorded. In the former system, feedback is exploited to achieve full spatial diversity order. | en_US |
