【作者】 邱刚；

【导师】 范平志；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2002， 硕士

【摘要】 本论文针对基于完全互补码的CDMA通信系统，就串行时分CDMA通信、并行多载波CDMA通信、系统性能和系统同步等四个相关主题进行了研究。 首先，论文对基于完全互补码的串行时分CDMA通信系统进行了详细分析，并采用SystemView仿真软件进行了性能仿真。分析和仿真结果表明，采用新的序列设计方式，工作在准同步方式下的串行时分CDMA通信系统的多址干扰可以大为降低，从而改善系统性能。论文还从理论上推导了基于完全互补码的串行时分CDMA通信系统在AWGN信道下的误码率，并计算了相关性能参数。 其次，论文对基于完全互补码的并行多载波CDMA通信系统性能进行了仿真研究，并推导了并行多载波CDMA通信系统性能参数。论文还分析了传统RAKE接收机不适用于本系统的原因，说明了对本系统采用自适应移位递归寄存器解决多径问题的必要性。 接着，论文研究并仿真了两种CDMA通信方式在Rice信道下的误码率性能。论文还比较了基于完全互补码的CDMA通信系统和采用m序列及Gold序列的传统CDMA通信系统在AWGN信道下的误码率性能。 最后，论文对基于完全互补码的CDMA通信系统的同步方式进行了研究。分别对帧同步、完全互补码的捕获、扩频码序列的跟踪进行了仿真研究。对于帧同步，采用了连贯插入特殊码字同步法进行仿真分析。为了提高系统抗干扰能力，论文采用了二级匹配的方法。在对完全互补码捕获的仿真中，本文提出了基于滑动相关法的并行捕获实现方案。对于扩频码跟踪仿真，本文采用了基带全时间超前-滞后回路进行仿真。更多还原

【Abstract】 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 Ri鑕 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.更多还原