Abstract
Improving the performance of the wireless communication is the key point that must be focused on. Space Time Block coding is a method to improve the performance of the wireless communication and achieve full diversity channel. This paper deals with the Space time Block coding method in wireless communication and study the effect of the fading on the performance of the channel. Therefore, simulate a simple wireless communication system by different number of transmitting and receiving antennas, and The modulation is assumed to be BPSK at different levels M .starting by two by one, then two by two and finally study the case of four by two. Simulate them and study the effect of the fading and the number of levels in the modulation (BPSK) on the number of the bit error rate sucessfully results are achieved.