摘要
扩频通信方式在现代战争和民用领域有着重要地位,而直扩通信方式因其隐蔽性在扩频通信方式中至关重要。在对直扩信号的研究中要估计其扩频码的码周期。针对常见的二次谱法估计码周期没有单独讨论长码非周期直扩信号的不足以及估计的谱线不明显,统计不到甚至出现负值导致估计结果不准确的问题,提出在做二次谱法之前,对长码非周期直扩信号做加窗分段和延时一个码片宽度相乘的处理步骤,使得自相关峰的幅度相较于噪声环境变得更加明显,并对二次谱做谱线间距频率统计处理。这种改进优化算法提升长码非周期直扩信号码周期的估计精度和信噪比容限,可以在-4dB环境下精确估计。
Spread spectrum communication plays an important role in the field of modern warfare and civil affairs.It is necessary to estimate the code period of the spread spectrum code in the study of ds signal.In view of the common secondary spectrum method to estimate no separate dis⁃cussion long code period code aperiodic spread spectrum signal and estimate of the spectral lines is not obvious,the deficiency of the statis⁃tics is less than negative even lead to the problem of inaccurate estimation results,this article puts forward:before making a secondary spec⁃trum method for aperiodic long code spread spectrum signal as the window to block and delay a code breadth of processing steps,raising the autocorrelation peak compared to the noise environment become more evident,and the secondary spectrum frequency statistics process⁃ing line spacing.This improved optimization algorithm improves the estimation accuracy and signal-to-noise ratio(SNR)tolerance of the number cycle of long code aperiodic DDS,and can be accurately estimated in the-4db environment.
作者
洪居亭
代华建
孙田亮
HONG Ju-ting;DAI Hua-jian;SUN Tian-liang(College of Electronic Information,Sichuan University,Chengdu 610065)
出处
《现代计算机》
2020年第15期52-55,74,共5页
Modern Computer
关键词
直接序列扩频信号
码周期估计
窗分段延迟相乘二次谱
谱线优化
Direct Sequence Spread Spectrum Signal
Code Period Estimation
Window Piecewise Delay Multiplication Quadratic Spectrum
Line Optimization
