Performance Evaluation of Multi-carrier Dcsk System over Multipath Fading

In this Paper, we studied the Multi-carrier Differential Chaos Shift Keying (DCSK) modulation. DCSK system provides robustness, higher data rates and optimized the transmitted energy efficiency (EE) as compared to traditional multi-carrier spread spectrum modulations. In this scheme, each binary data is mapped to two chaotic sequences each of the transmitted bits consist of two parts, where one part is reference slot having M subcarrier is assigned to transmitting, while the other will carry the data slots. In this case, one chaotic reference is used to transmit M-1 bits, which is used to save the transmitted bit energy. DCSK transmitted structure is increases the spectral efficiency (SE) and uses less energy. The receiver circuit has easy to implement where no radio frequency (RF) delay circuit is needed to demodulate and receive original data. We computed and compare the bit error rate (BER) performance of MC-DCSK system under multipath Rayleigh fading and AWGN channels. Simulations results of MC-DCSK for M subcarriers where spreading factor values changed.