OFDM Simulation in Gaussian Channel with Multiple Modulation Schemes

This experimental study utilizes an OFDM simulation program operating in Gaussian channel conditions. The simulation implements four distinct modulation schemes: BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM (16-ary Quadrature Amplitude Modulation), and 64QAM (64-ary Quadrature Amplitude Modulation). In code implementation, each modulation technique maps binary data to corresponding constellation points, with BPSK using 1 bit per symbol, QPSK using 2 bits, 16QAM using 4 bits, and 64QAM using 6 bits per symbol respectively. The OFDM system typically involves serial-to-parallel conversion, IFFT (Inverse Fast Fourier Transform) operation for orthogonal subcarrier generation, cyclic prefix insertion, and demodulation using FFT at the receiver. These modulation schemes enable different trade-offs between data transmission rates and system reliability in communication systems. Through these simulations, we can evaluate the performance characteristics of each modulation technique under Gaussian channel conditions, including BER (Bit Error Rate) analysis and spectral efficiency comparisons. This assessment helps better understand their respective advantages, limitations, and practical application scenarios in real-world communication environments.