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- The synchronization method of PN sequence for the need of fast acquisition and tracking in telemeter is presented. 3、为了满足测距中伪码快捕的需要,通过分析常见的伪码同步方法,确定了本系统采用的伪码快捕和跟踪方案。
- The spread spectrum communication has advantages of anti-noise, anti-interaction and nice secrecy for the noise characteristic of PN sequence. 由于PN序列具有类噪声特点，使得扩频通信具有抗噪声、抗干扰、保密性能好等优点。
- Based upon the study of the cyclic spectrum of DS &DS/CDMA signals, a spectral correlation approach is presented to estimate the chip interval of PN sequence. （3）在对DS及同步DS/CDMA信号周期谱（谱相关）研究的基础上，论证了应用DS信号的周期谱（谱相关）可以得到该信号PN码片宽度的估计，提出了一种用于估计同步DS/CDMA信号PN码片宽度的谱相关算法，并作到了较低的信噪比容限。
- An efficient method that can blindly estimate and synchronize to PN sequence of direct sequence spread spectrum (DS-SS) signal quickly is presented in a non-cooperative context. 摘要在非协作信息侦测情况下，提出了一种实用的直接序列扩频(DS-SS)通信信号PN码序列的快速盲估计方法。
- In direct sequence spread spectrum communication system, enemy is assumed to detect whole PN sequence chip by chip and a modulated retransmitted interference is created. 在直接序列扩频通信系统中,假设敌方能够逐个比特地检测到整个PN序列,并产生一个调制的转发干扰。
- The Frame Detection Algorithm has verified the feasibility and validity of PN sequence as the lead polit-code, and provided certain basis to different cases. 文章通过仿真帧检测算法,验证了PN码作前导码的可行性和有效性,并为不同要求下的前导码选择提供了一定的依据。
- This paper presented a fast low-complexity frame and carrier-offset synchronization scheme by utilizing the pilot frame and the character of PN sequence. 提出了一种以PN序列为前导的快速低复杂度的帧定时和整数倍频偏联合同步算法。
- Orthogonal Spreading, PN sequence, signal modulation and the global initialization, the module of global initialization is used to set some common parameters of the whole simulation model. 按照模块化设计过程分别实现了CDMA2000 1x系统的CRC编码器模块、卷积编码器模块、信号交织器模块、正交扩频模块、PN信号生成器模块和信号调制模块,以及用于设置整个仿真模型中使用的一些公共参数的初始化模块。
- The theoretical analysis and simulation results indicate that,for DS-UWB sysems,the avarage PN sequence synchronization acquisition time using auxilary sequence is only a half of that using sequentral sliding approach. 最后,理论分析与仿真结果表明,利用辅助序列实现DS-UWB系统伪随机序列同步捕获的平均捕获时间低于串行滑动相关方法平均捕获时间的一半。
- The incoherently demodulated spread spectrum modem with bandwidth of 4 MHz and data rate of 32 kbit/s uses PN sequence phase-coded SAW tapped delay lines(SWTDL)with center frequency of 32 MHz as the phasecoded waveform generator and matched filter. 表面波抽头延迟线非相干扩频调制解调器使用m序列相位编码表面波抽头延迟线作为相位编码波形发生器和匹配滤波器。 它具有4MHz带宽和32kbit/s的数据率。
- Noted that on each orthogonal subcarrier branch, transmitted data bit after serial to parallel converted is modulated with a chip of a PN(Pseudorandom Number) sequence, not a whole PN sequence. 在每个分支上,使用相同扩频序列的不同码片调制子载波。
- A new method of PN codes forecast is proposed in this paper based on the analysis of randomicity of PN sequences. 通过分析伪随机序列的伪随机性,提出了基于后验概率的伪码预测方法。
- Based on the estimated NBI eigen-waveforms and the PN sequences, NBIs can be rejected and the DS-SS signals despreading without the PN code can be realized too. 同时利用所估计的NBI特征波形可消除原始信号所夹杂的NBI，而利用所估计的PN码序列则可以对DS-SS信号实施盲解扩处理。
- To satisfy the unique request of PN sequences optimization,the paper proposes a scheme in which a set of shift sequences of one m-sequence are used as SS code in radio navigating system. 针对无线电测距对扩频码的特殊要求,通过对传统的扩频码的比较分析,提出在无线电导航系统中引入移位序列作为扩频地址码。
- In video disk, a consecutive sequence of frames. 在视频光盘上，一种连续的帧序列。
- She made a sequence of dance movements. 她做了一个连续的舞蹈动作。
- Based on the characteristics of correlation between PN sequences and received signals, a new method which combines code acquisition and symbol timing recovery for TDS-OFDM receiver is developed. 摘要提出了TDS-OFDM接收机中一种结合PN序列相位捕获的定时同步算法。
- Strategy of PN Sequence Capture Used in Low SNR Condition 一种低信噪比环境下的PN码捕获策略
- Put the mixed historical facts in sequence. 将混淆的历史事件按顺序排列。
- Study of Group Delay Effect on PN Sequence Ranging System 系统群时延特性对伪码测距影响的研究
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