Enhancing Quality of Service using OFDM Technique for Next Generation Network

The migration to 4G networks will bring a new level of expectation to wireless communications. As after digital wireless revolution made mobile phones available for everyone, the higher speeds and packet delivery of 4G networks will make high quality multimedia available everywhere. The key to achieving this higher level of service delivery is a new air interface. Orthogonal Frequency Division Multiplexing (OFDM) is an alternative wireless modulation technology to CDMA. OFDM has the potential to surpass the capacity of CDMA systems and provide the wireless access method for 4G systems. OFDM is a digital modulation and multiplexing technique. In this paper, various digital modulation techniques has been discussed such as BPSK, QPSK, 8-PSK and 16-PSK. Architecture has been designed and simulated in MATLAB with various configurations of OFDM technique. The main objective of the current research work is to measure Bit Error Rate with different modulation schemes and come to the best configuration to achieve better utilization of bandwidth. The configuration has been tested with analog and digital modulation techniques and results have been compared. KeywordsOFDM; 3G; 4G; BPSK; QPSK; Bit Error Rate.