Simple OFDM Model Source Code

In this document, I provide MATLAB source code for a simple OFDM model. The program focuses on OFDM modulation implementation using BPSK (Binary Phase Shift Keying) and demonstrates OFDM's improvement in bit error rate (BER) performance. Below I detail the implementation process with specific code-related descriptions.

First, we import necessary MATLAB functions and libraries. We define key parameters including carrier frequency, number of subcarriers, and OFDM symbols count using clear variable initialization. The code establishes fundamental simulation parameters through structured parameter definition blocks.

We generate a random binary sequence as the information source using MATLAB's random number generation functions. The binary data then undergoes BPSK modulation where binary '0' and '1' are mapped to complex symbols -1 and +1 respectively through mathematical transformation operations.

The modulated symbols are distributed across multiple subcarriers using subcarrier allocation algorithms. Each subcarrier's modulated signal undergoes Inverse Fast Fourier Transform (IFFT) to convert frequency-domain signals to time-domain OFDM symbols, implemented through MATLAB's ifft() function with proper normalization.

At the receiver side, we first perform Fast Fourier Transform (FFT) using MATLAB's fft() function to convert time-domain signals back to frequency-domain representations. Then BPSK demodulation is applied, converting received symbols to binary sequences through decision boundaries and threshold comparisons.

Finally, we calculate the Bit Error Rate (BER) by comparing transmitted and received bit sequences. The code includes BER curve plotting functionality using MATLAB's plotting commands to visualize OFDM's effectiveness in reducing error rates across different signal-to-noise ratio conditions.

This simple OFDM model helps understand OFDM modulation principles and operational mechanisms. The modular code structure allows parameter adjustments for further system performance optimization, including subcarrier number variation and modulation scheme modifications. Hope this source code proves helpful for your OFDM implementation studies!