Performance analysis of CCK- OFDM over fading channel

The increased use of data communications, improving urban/metropolitan infrastructure, and high mobility user are factors causing signal propagation problems affecting communication service quality. The application of coherent communication system using channel estimation is not sufficient yet to maintain these problems due to its complexity when being applied to high mobility environment. Since non-coherent communication system on the channel does not require carrier recovery, it becomes one of the alternative solutions. DQPSK is one of the non-coherent modulations and Complementary Code Keying use it to map bit stream into phase symbols. In this research each system of CCK and DQPSK were integrated with OFDM. By comparing the BER performance and Eb/No, the results showed that in order to reach BER in 10^-5, CCK-OFDM required 15 dB in low mobility environment and 17.5 dB in high mobility environment meanwhile DQPSK-OFDM required 20 dB in low mobility environment and over 30 dB in high mobility environment.