Study And Simulation On CDMA Communication Systems Based On Complete Complementary Codes

The bit error rate (BER) performance for CDMA communication systems based on CC-Codes(Complete Complementary Codes) is mainly examined in this thesis. Four related topics are considered, i.e., STD-CDMA(Serial Time Division CDMA ) communication system, PMC-CDMA(Parellel Multicarrier CDMA) communication system, performance analysis of CDMA system, and synchronization of CDMA systems.First, after detailed analysis of the STD-CDMA communication system based on CC-Codes, the BER performance is simulated by using SystemView software. The STD-QS-CDMA(STD Quasi-Synchronous CDMA) communication system is designed and simulated , Analysis and simulation results show that the STD-QS-CDMA has almost no MAI with the new sequences design method,and the performance of the system is improved significantly. The BER performance of STD-CDMA communication system in AWGN and the performance parameters of the system are also derived.Second, the BER performance for PMC-CDMA communication system is simulated, and the performance parameters of PMC-CDMA communication system are derived. The reason that RAKE receiver can't be used in the systems proposed in this paper is analyzed,and the reason also explains why this system needs the adaptive shift recursive register to combat with the multipath fading.Third, The BER performance for STD-CDMA and PMC-CDMA communication systems under Rié‘• channel is evaluated using computer simulations. The obtained BER performance of the system proposed in this paper is compared to that of conventional CDMA systems using Gold codes and m-sequences under AWGN environments.Finally, Synchronization schemes of CDMA communication systems are studied. Frame synchronization, acquisition and tracking of CC-Codes are simulated..Continual special code insertion method is used in the simulation of frame synchronization. In order to improve anti-interference performance, a two-phase matching method is adopted. The parallel scheme based on slidingcorrelation method is proposed in the simulation of Acquisition.Baseband fully time delay-locked PN code tracking loops are employed in tracking simulation.