MATLAB Simulation of VBLAST-OFDM System with Graphical Interface

This research presents a MATLAB-based simulation framework for VBLAST-OFDM (Vertical Bell Laboratories Layered Space-Time Orthogonal Frequency Division Multiplexing) systems. The implementation includes key components such as spatial multiplexing across multiple antennas, OFDM modulation/demodulation using FFT/IFFT operations, and successive interference cancellation algorithms for signal detection. The simulation generates comprehensive performance metrics including BER (Bit Error Rate) curves, constellation diagrams, and channel capacity analysis under various SNR conditions. A customizable graphical user interface allows users to modify system parameters like antenna configuration, modulation schemes (QPSK, 16-QAM, etc.), channel models, and coding rates through interactive controls. The GUI integrates MATLAB's App Designer components with core signal processing functions to visualize real-time simulation results including power spectral density plots, antenna correlation matrices, and layer-by-layer decoding performance. The simulation architecture employs matrix operations for channel estimation using pilot symbols, implements zero-forcing or MMSE equalization techniques, and features adaptive modulation capabilities based on channel state information. This study provides valuable insights into MIMO-OFDM system design through detailed simulation experiments and intuitive visualization tools, serving as both an educational resource and research foundation for advanced wireless communication systems.