802.11p OFDM QPSK Rayleigh Fading Communication System

802.11p is a wireless communication standard specifically designed for Vehicle-to-Everything (V2X) communication, employing Orthogonal Frequency Division Multiplexing (OFDM) technology. OFDM divides high-rate data streams into multiple parallel low-rate substreams transmitted simultaneously over orthogonal subcarriers, effectively combating multipath interference through cyclic prefix insertion. In code implementation, this involves serial-to-parallel conversion, IFFT processing, and cyclic prefix addition. QPSK (Quadrature Phase Shift Keying) modulation encodes 2 bits per symbol by mapping pairs of bits to one of four equally spaced phase shifts (0°, 90°, 180°, 270°), achieving efficient spectral utilization. Rayleigh fading modeling simulates wireless signal attenuation caused by scattering from obstacles in non-line-of-sight environments, typically implemented using complex Gaussian random variables to generate fading coefficients. The combination of these technologies enables robust, high-speed communication essential for vehicular safety applications, with implementation requiring careful consideration of channel estimation, equalization techniques, and Doppler spread compensation for mobile environments.