This technique can improve the availability of frequency band, anti-jamming capability between codes, error correction and error bit rate. The coding formula of Turbo code is derived in PPM mode. The technique was simulated with Matlab software. The simulation result shows that this solution can reduce the bit error rate and improve the efficiency of the whole communication system.
此方法不仅能提高频带的利用率，也能提高码间抗干扰能力、纠错能力和降低误码率，并对PPM调制模式下的Turbo码译码公式进行了推导，最后利用Matlab软件实现了该技术的仿真，仿真结果表明：在紫外激光通信中采用PPM和Turbo统一调制编码的技术能进一步降低系统的效率和误码率。
In the development of filter, adopting interdigital structure of stripline, it is providewith higher rejection and has no autoeciousness band in very wide frequency. structureof debugging is added to reduce the affection of manufacture error improving the indexsignificantly.
滤波器设计中，采用带状线交指结构，带外抑制度高，并且在很宽的带内没有寄生通带；根据滤波器自身的结构特点加入了调试装置，用来补偿加工带来的误差，极大的改善了测试指标。
In the paper, the sequence of inverse Fourier transformation of wavelet low-pass filters is multiplied by the filter pulse sequence, thus filtering the frequency-domain signal using wavelet filters. This method can be used to smooth the filter`s transmission band and reject high frequency components, thus reducing the error and improving the anti-aliasing capacity of low-order filters.
文章以小波低通滤波器H的逆Fourier变换所得的序列同滤波器脉冲序列相乘，相当于小波对滤波器的频域信号进行滤波，在滤波器阶数不高的情况下，能起到平滑滤波器通带频谱，抑制高频成分，达到减小误差及增强抗混叠能力的作用。
When used in signal expansion, this model can give a relative constant error of approximation in a larger frequency band.
实现了采用此模型的匹配算法，并且通过实验对比了梯度法、相位法和新算法的性能
A system (110) and method for signal transmission and reception by narrow band chaotic frequency shift keying includes a forward error correction encoder (118)for receiving input data, a data packetizer (120) in signal communication with the forward error correction encoder, a compression encoder (122) in signal communication with the data packetizer, a radio frequency link (114) in signal communication with the compression encoder, a compression decoder (124) in signal communication with the radio frequency link, a data depacketizer (126) in signal communication with the compression decoder, and a forward error correction decoder (128) in signal communication with the data depacketizer for recovering the input data by controlling the orbits of chaos; where the method includes the steps of transmitting a signal indicative of chaotic frequency shift keyed data, propagating the transmitted signal within a narrow frequency band, and receiving the propagated signal substantially without degradation of the indicated data by controlling the orbits of chaos.
一种用于通过窄带混乱频移键控来进行信号发送和信号接收的系统(110)和方法，所述系统包括：前向纠错编码器(118)，用于接收输入的数据；数据分组化器(120)，它与所述前向纠错编码器进行信号通信；压缩编码器(122)，它与所述数据分组化器进行信号通信；射频链路(114)，与所述压缩编码器进行信号通信；压缩解码器(124)，它与所述射频链路进行信号通信；数据逆分组化器(126)，与所述压缩解码器进行信号通信；前向纠错解码器(128)，与所述数据逆分组化器进行信号通信，以通过控制混乱的轨迹而恢复输入的数据；其中所述方法包括步骤：发送指示混乱频移键控数据的信号；在窄频带内传播所发送的信号；接收所述被传播的信号，并且通过控制混乱的轨迹而基本上没有使所指示的数据退化。
From the experiment results, it is shown that about 22% error between the theoretical calculation results of the fatigue life of the notched composite laminates and the test values is included in the scatter band.
实验结果表明：复合材料含孔板的疲劳寿命理论计算值与实验值相差约22％，以被包容于分散带之中。
Simulation results show that when extended binary phase shifting keying signals are contaminated by the relatively strong narrow band interference, the performances of matched filters and linear equalizers are degenerate rapidly, but geometric feature equalizers based on minimum bit error rate provide very low bit error rate, and their performance is also much better than that of nonlinear equalizers based on minimum mean square error.
仿真表明：对于扩展的二元相移键控信号，在相对强的窄带干扰下，匹配滤波器及线性均衡器已失效，而基于最低误码率准则的几何特征均衡器仍能表现出良好的性能，也大大优于基于最小均方误差准则的非线性均衡器。
A nonlinear geometric feature equalizer based on minimum bit error rate is proposed for removing interference whose frequency band overlaps with the desired signal in high efficient modulation communications, and the equalizer is realized by radial basis function neural network.
针对高效调制通信系统中带内干扰抑制问题，提出一种基于最低误码率准则的非线性几何特征均衡器，并用径向基函数神经网络来实现。
The method controls the move of head flying over the disk by firmware and analyzes the width change of projection of the read head, write head and erase band. The experiment shows skew angel can change off-track capability of magnetic head and change the radial error propagation of radial error of self servo-writing.
分离式磁头对硬盘驱动器伺服信息自刻写的影响同样不容忽视，为此提出了一种测定磁头偏移磁道能力大小的方法：通过控制磁头飞行过程，并在飞行过程中动态获取读头信号幅度和比特误差率，从而获取磁头磁道偏移能力。
The reestablish and error estimation formulas of the non-noise signal under the finitive scale condition is given for the basic filtering operation of high pass, low pass, and band pass respectively. The signal Wavelet analysis softwave developed, which is of some common use, and is served as the basis of the research following it, is also introduced here.
第二章首先建立了突变信号的数学模型；导出了对突变信号进行连续小波分析的尺度截取准则；分别针对突变信号进行高通、低通和带通三种基本滤波操作的情况，给出了在有限尺度分析情况下的非噪部分信号的重建估计和误差估计公式；并介绍了所开发的作为后续工作的基本分析工具、具有一定通用性的信号小波分析软件。
Arc plume emis— sion spectrum which fits the Planck blackbody radiation function by assuming T=4350 K shows Swan band system of C2.The arc plasma temperature is about 4300~4400K, and the error is about 100K.
放电过程中的电弧等离子体光谱测试表明其中主要有C2分子的发射峰，光谱分布曲线与普朗克黑体辐射曲线中T=4 350 K的分布情况吻合，确定放电电弧等离子体温度约4 300~4 400k，测量误差约100 K。
The improvement on bandwidth of the second kind of Balun transformer by enhancing microstrip couple effect carries out wide-band result, and 180° phase different of two balance- output ports, error no more than 1%.
藉由加强微带线间的偶合效应，来改进第二型平衡转非平衡转换器频宽的缺点，使达到宽频的效果，且两平衡输出端相位差差180°，误差在1%以内。
No external ramp components needed s Built-in over-voltage and under-voltage detection s High-speed over-current trip; 170 ns typical s Over-voltage clamp on supply voltage s Internal divider regulates VDD to 12 V. No external divider needed s Leading edge blanking of the current sense signal s Control frequency modulated over a narrow band to reduce Electromagnetic Interference s High output drive capability; 150 ns typical rise and fall time into 2 nF load s Wide bandwidth (10 MHz) error amplier with external compensation pin and simple interface to optocoupler s Accurate internal bandgap reference.
无需外部元件坡道需要的内置过电压和欠电压检测的高高速过电流跳闸； 170纳秒典型的S过电压钳位电压之内部分隔VDD的12个五，没有规定外部分压器需要的主导优势的电流感应信号的消隐法控制频率超过1窄带调制，以降低电磁干扰的高输出驱动能力； 150纳秒典型的上升和下降到2 nF的负载时间s宽带宽（ 10兆赫）错误与外部补偿引脚和简单的界面，光耦放大器到精准农业内部带隙基准。
The error in the experiment is analyzed and it is found that the measuring accuracy will be improved by choosing longer wave band, lower scan speed, shorter response time and smaller slit width.
在实验的过程中进行了误差分析，分析表明选取长的测量波段、低的扫描速度、短的响应时间和小的狭缝宽度都有利于提高测量精度，并从理论上证明所得厚度的精度高于电子数显千分尺的测量精度。
Besides, a new algorithm is used to draw track error band, which guarantees track error band to parallel with ship's course.
由于原来的船舶航迹控制显示系统为DOS环境下用C语言编程实现的，显示不够美观[1] 。
Because the ball screw lead error data is so complex that we cant do the power spectrum density analysis and cepstrum analysis directly. Before doing this we must use wavelet package frequency band decomposing technology to decompose the frequency band of the screw lead error data.
由于滚珠丝杠导程误差的复杂性，不能直接对它进行功率谱密度分析和倒频谱分析，必须先对它们进行小波包频带分解。
It also gives the expression of the approximate function and analyses the absolute value error and the phase error in the approximate frequency band. In addition, it presents the parametric curves and the basic methods of the circuit design.
给出了近似函数的表达式，分析了函数于近似频带内的绝对值误差和相位误差，给出了设计此种电路的参数曲线和基本的设计方法。
The modeling performance is assessed in terms of in-band and out-of band errors, such as normalized mean square error and adjacent channel error power ratio, and it is compared with a conventional NARMA, a memory polynomial with respect to accuracy and computation complexities.
广义NARMA模型性能通过使用归一化的均方误差和邻道误差功率比等带内和带外失真误差进行评价，并且在计算精度和计算复杂性方面和传统的NARMA模型及记忆多项式模型进行比较。
The result shows that the ability of anti-interference from strong-narrow band can be improved by using albefaction filter, the interference resisting property of the dual tap filter is much better than that of predicted error filter.
仿真结果表明，加白化滤波器确实能提高系统的抗强窄带干扰的能力，同时也表明双向抽头滤波器的抗干扰性能比预测误差横向滤波器的性能要好。
Two-band photographic ratio method is closer to the measured values of the three-band photographic ratio method by the error analysis and discovery of these algorithms.
通过对两种算法的误差分析发现，二波段比值方法比三波段比值方法的结果更加接近实测值。