Comparative Analysis of Digital Modulation Techniques in LTE 4G Systems

The basic criteria for best modulation scheme depends on Bit Error Rate (BER), Signal to Noise Ratio (SNR), Available Bandwidth, Power efficiency, better Quality of Service, cost effectiveness. The performance of each modulation scheme is measured by estimating its probability of error produced by noise and interference induced in the channel. Modulation methods which are capable of transmitting more bits per symbol are more vulnerable to error caused by noise. The modulation technique used for OFDM-LTE (4G) syatems are M-PSK and QAM, so in this paper the Bit error rate (BER) of M-PSK and QAM digital modulation schemes are compared under AWGN, and Rayleigh fading channels to identify a suitable digital modulation scheme for OFDM application. The research has been performed by using MATLAB SIMULINK for simulation and evaluation of Bit Error Rate (BER) and Signal-to-Noise Ratio (SNR) for OFDM system models