Analysis the Effect of Spectral Efficiency on Digitally Modulated OFDM Communication System over Realistic Channel Condition

In OFDM communication system, the choice of modulation technique is considered very important for good system performance. It is our primary need today to achieve high data rates in limited spectrum bandwidth to improve the performance of signal. Spectral efficiency describes the ability of a modulation scheme to accommodate data within a limited bandwidth. In this paper, the performance of spectral efficiency for different modulation techniques namely BPSK, QPSK, and 16PSK have been investigated over AWGN and Fading channel conditions. The simulation model that is build for this paper, demonstrated that 16PSK modulation scheme has a better performance than BPSK and QPSK over any channel condition. MATLAB R2010a is used as a simulation tool and synthetic data is used as input data for this research work.