Description

In broadband wireless system, the signal energy is scattered and reflected from objects in the environment, components of the signal arriving at the receiver are spread out over a longer period of time than is desirable. The challenge is then to provide a high-performance reliable data link that can operate with the restricted receiver power levels, severe channel fading due to multipath reflections and interfering energy from other devices nearby.  With OFDM, it is possible to use a differential coding/differential detection either in the time or frequency domain depending on the condition of transmission channels with the adoption of 16QAM as a method of subcarrier modulation. In this process we implement an OFDM with the QAM modulation technique by using the random bit generator as an input for our process and for the transmitter we use the IFFT and for the receiver use FFT in the implementation process.