一种DS扩频系统抗干扰性能的仿真  

Simulation of Anti - jam Capability for DS Spread Spectrum System

作　　者：屈霞[1] 马正华[1] 李文杰[1] 张小鸣[1] 

机构地区：[1]常州大学信息科学与工程学院,江苏常州213164

出　　处：《计算机仿真》2010年第11期122-124,179,共4页Computer Simulation

摘　　要：针对传统直接序列扩频系统(DS-SS)抗干扰性能仿真方法在工程应用中难以实施及系统纯硬件实现的复杂性,提出一种基于VHDL的仿真方案。设计两种不同扩频增益系统,在扩频信号中引入表征各种干扰环境集中产生的噪声;收端采用序列相位搜索捕获法获得同步进而实现相关解扩。在两种处理增益下通过增大噪声,对各种干扰环境下系统性能进行分析。仿真结果表明,提高扩频增益可提高抗干扰性能。当扩频增益为127时,接收扩频信号中误码率为26%时系统能正确解扩;扩频增益增加3dB,即使错误码元达38%,系统仍能零误码解扩。仿真方法和结论对实际应用有一定的参考价值。Aiming at the difficulty of implementation in engineering area of traditional simulation method for DD-SS Anti-jam capability and the implementation complexity by pure hardware,the paper presents a simulation scheme based on VHDL.Two systems with different spreading gains are designed.The noise is introduced to the spread spectrum signal which characterizes concentration under various interference.Search and acquisition by sequence phase are used to realize the synchronization and to achieve correlation despreading.By increasing the noise in two spreading gain systems,the system performance is analyzed under different interference environments.Simulation result shows that increasing spreading gain can improve anti-jam capability.When the spreading gain is 127 and the error rate of received spread spectrum signal is 26%,the system can despread correctly.Even the error rate of received signal reaches 38%,still the system can despread to get error free code.Simulation method and result experiments have some reference value for practical applications.

关 键 词：直接序列扩频系统 抗干扰性能 序列相位搜索捕获法 相关解扩 

分 类 号：TN914.42[电子电信—通信与信息系统]