Performance Assessment and Computer Simulation of the M-ary QAM Modulation Scheme

الملخص

The most important issue in digital communication system is to receive data as similar as the data sent from the transmitter  with a high speed using less channel bandwidth. This means that it is  important to test  the systems in terms of probability of error to view the system's performance. Each modulation technique has different performance while dealing with signals,  which normally are affected with noise.  One of  digital modulation scheme is used is known as an   M-ary Quadrature Amplitude Modulation (M-ary QAM) .In this paper performances investigation   and computer simulation  of M –ary QAM has been carried out  for different number  of levels symbols using  powerful scientific software known as a Matlab with Simulink V. 2018. When  increasing the number of levels, the simulated  result,  show that the bit error rate (BER) decrease  but generally   M-ary QAM  is  more bandwidth efficient  than other M- ary modulation  systems types.