OFDM Simulation Using Different Modulation Techniques with MATLAB
Devansh Shrivastava[1], Somesh Tanwani[1], Deepak Kumar Ray[2]
[1]Students at the Department of Electronics and Telecommunication, Bharati Vidyapeeth Deemed To Be University College Of Engineering Pune
[2]Assistant Professor at the Department of Electronics and Telecommunication, Bharati Vidyapeeth Deemed To Be University College Of Engineering Pune
Abstract — Our project "OFDM Simulation Using Different Modulation Techniques With MATLAB" is primarily intended to develop a MATLAB-based simulation of OFDM, i.e. Orthogonal Frequency Division Multiplexing, and using various other modulation techniques like QPSK, BPSK, and so on, and compare its system parameters errors with the OFDM methodology of Modulation, as some variables are entered by the user. The remaining variables are either fixed or derived from user input and fixed variables. Among the user input variables are:
- Input file (to be taken from the user) – an 8-bit grayscale (256 gray levels) bitmap file (*.bmp file);
- IFFT size – an integer of a power of 2;
- of carriers to be present – not greater than [(IFFT size)/2
– 2];
- Digital modulation techniques – BPSK, QPSK, 16-PSK, or 256-PSK;
- Signal peak power clipping to be measured in dB;
- Signal_to_Noise Ratio (SNR) measured in
The structure and implementation of an OFDM modem used in wireless communication are discussed in this paper. Orthogonal recurrence rate Division Multiplexing (OFDM) is one of the most recent modulation techniques used to combat frequency- selectivity in transmission channels while achieving significant data rates with no inter-symbol disturbance. This technique is used in bandwidth-intensive applications such as video conferencing, DAB, DVB, and many others. The use of MC- CDMA allows for multi-user capacity. OFDM refers to a group of techniques that have been proposed for use in 4th Generation cellular systems. The majority of the time, orthogonal. In multipath environments, conventional techniques such as QAM have very high bit error rates and ISI, which can be reduced by implementing the OFDM technique. Nevertheless, the application is limited by the presence of a potentially high peak-to-average electrical power ratio (PAPR).(1).
