OFDM System Transmission Implementation

This implementation simulates the complete OFDM transmission chain, where transmitted signals pass through a multipath fading channel before being received and decoded. The channel modeling employs the Jakes model to simulate realistic wireless propagation conditions. In the code implementation, the Jakes model generates multiple oscillators with specific Doppler frequencies to create time-varying channel characteristics. The transmitter typically includes modules for QAM modulation, IFFT processing, and cyclic prefix insertion. The receiver performs corresponding FFT transformation, channel estimation, and equalization. For practical adaptation, users can modify the time dispersion coefficients (e.g., [0.9, 0.8, ...]) to adjust the channel's power delay profile. These coefficients represent tap gains in the channel impulse response and can be optimized through parameter sweeps to match specific propagation environments. The simulation allows performance evaluation by comparing BER metrics across different coefficient configurations. Key algorithmic components include: OFDM symbol generation using IFFT, cyclic prefix addition to mitigate ISI, Jakes model implementation for Rayleigh fading simulation, and zero-forcing or MMSE equalization at the receiver. The modular structure enables easy testing of different channel conditions and system parameters.