Abstract

Now days, digital communication systems become complex and sophisticated. Not all vendors, if any, can understand the system and components of system that represent different modulation techniques, line and block coding, multiplexing and multiple access.

They need the conclusion about which of modulation techniques is the suitable for transmission and in the same time can save the power and bandwidth.

Engineers can study and analyze the modulation techniques and then compare between them to give such conclusion using modeling and simulation.

MATLAB is a high level mathematical language for technical computing.

In this paper we use MATLAB environment as simulation software to give on display a clear result that used to compare between two digital Passband modulation techniques BPSK and QPSK, and pinpoint the performance of the two techniques over selected parameters.

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