OFDM Simulation with MATLAB Implementation

This program implements OFDM modulation, which includes QPSK modulation (converting binary data to complex symbols), serial-to-parallel conversion (dividing data streams into parallel subcarriers), IFFT modulation (transforming frequency-domain signals to time-domain using Inverse Fast Fourier Transform), upsampling (increasing sampling rate for anti-aliasing), low-pass filtering (removing high-frequency components), followed by channel transmission. The receiver chain employs low-pass filtering to eliminate excess noise, downsampling (reducing sampling rate), FFT demodulation (converting time-domain signals back to frequency-domain), parallel-to-serial conversion (recombining subcarriers), and QPSK demodulation (mapping symbols back to binary data), completing the full-cycle OFDM simulation using MATLAB. To further enhance this program, the following optimizations can be considered: 1. Expand modulation schemes: Beyond QPSK modulation, implement higher-order modulations like 16-QAM or 64-QAM using constellation mapping functions to improve data transmission rates and spectral efficiency. 2. Incorporate channel coding: Introduce error correction codes such as convolutional coding or LDPC coding using MATLAB's Communications Toolbox functions to enhance system robustness against interference and improve bit error rate performance. 3. Add channel estimation and equalization: Implement algorithms like Least Squares or MMSE estimation with corresponding equalization techniques (e.g., zero-forcing equalizer) at the receiver to mitigate channel-induced distortion and improve reception quality. 4. Integrate multi-antenna technologies: Incorporate MIMO (Multiple-Input Multiple-Output) or SIMO (Single-Input Multiple-Output) techniques using spatial multiplexing/diversity algorithms to achieve better transmission reliability and spectral efficiency. These optimizations would significantly improve the program's performance and simulation accuracy through advanced signal processing implementations.