MATLAB Implementation of OFDM System with QPSK Modulation
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This article presents a comprehensive study of OFDM systems utilizing QPSK modulation. We begin by implementing the core OFDM transmitter and receiver chain in MATLAB, which involves serial-to-parallel conversion, IFFT/FFT operations, cyclic prefix addition/removal, and QPSK modulation/demodulation. The constellation diagram visualization is achieved through MATLAB's plotting functions (scatterplot or plot) to examine signal point distribution and verify proper modulation. For BER analysis, we implement Monte Carlo simulations comparing transmitted and received bits under various signal-to-noise ratio (SNR) conditions, utilizing error counting algorithms and SNR sweep loops. The performance evaluation includes plotting BER versus SNR curves using semilogy function to assess system reliability. Through this systematic implementation and analysis, we gain deeper insights into OFDM system optimization techniques and practical performance considerations.
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