The application of modulation and demodulation in current detection with optic fiber sensing

Then digital image simulation results and analysis have been presented for supermode sampling.

然后对超模式采样计算机图像仿真结果进行了分析。

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The transverse supermode competition was analyzed based on a set of rate equations.

基于速率方程组对激光器和放大器中的模式竞争进行了数值分析。

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The results show this sampling technology can improve the image spatial resolution of EO sensor through changing sampling distance in the direction of along push scan and the engineering implementation is relative simpler than that of supermode sampling.

试验结果表明：改变探测器推扫方向的采样间距，斜模式采样技术可以提高传输型光学遥感器图像的空间分辨率，该技术相对于超模式采样技术，工程实现上要简单。

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The filter with maximum reflectivity about 20 dB, bandwidth larger than 1 nm is obtained. The results are qualitatively analyzed with supermode theory.

实验中获得了最大反射率约为20dB，线宽大于1nm的滤波器，并采用超模理论对实验结果进行了定性分析。

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We analyze the theory of their samplings, and make a brief introduction of SPOT-5 satellite which uses supermode sampling.

分析了它们的采样工作原理，并对使用超模式采样方式的SPOT-5卫星进行了简介。

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Supermode depression was realized by introducing additive pulse limiting effect using self phase modulation induced spectral spreading in dispersion shifted fiber and spectral bandpass filtering simultaneously. Supermode noise can be depressed enough when the pump power was 50 mW.

利用自相位调制+频谱滤波抑制超模噪音，实验中当抽运功率在50mW以上时就足可以抑制超模噪音。

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The conclusion was verified by simulation signals with different noise intensity and rolling bearing's defect vibration signal. Analysis shows that the proposed method is more effective than direct modulation or time delayed autocorrelation demodulation in denoising or clarifying modulation information.

不同噪声强度仿真数据和滚动轴承故障振动信号实验数据分析表明，该方法比直接解调或仅采用时延相关解调更能有效抑制噪声，凸现信号调制信息。

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With the progress of science and technology, laser interferometry technology develops to higher accuracy and greater dynamic range. At the same time, the demodulation technology is demanded higher and higher.

随着科学技术的进步，激光干涉测量技术向着更高的精度和更大的动态范围方向发展，对其解调技术的要求也越来越高。

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Research on the method of real time digital demodulation for the FSK signal

FSK信号数字化实时解调方法

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This paper introduces the concept of the HF multitone parallel signal and the technical standard of the 39 tone parallel signal, describes the principle of the 39 tone parallel signal and presents a way to realize the real time demodulation with the TMS320C30/ C31.

本文介绍了短波多音并行信号的概念及39音并行信号的技术规格，论述解调39音并行信号的原理，给出一种用TMS320C30/C31实时解调的实现方法。

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Thus, the design and implementation of real time demodulation algorithm of QAM signals are of significant theoretical and practical importance.

深入研究QAM信号的解调算法，对于QAM信号解调的软硬件实现，有非常重要的理论和现实意义。

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Algorithm Design of Real Time Demodulation for Shortwave QAM Signals

短波QAM信号实时解调算法设计

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Inverted Differential Grating Demodulation System of Laser Doppler

倒置差动式激光多普勒光栅检波系统

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To fit the needs of burst communication systems, one-bit and two-bit differential demodulation methods are studied in the thesis and realizes GMSK modulation and demodulation process using the former. A comparison is made to see the performance differences of the two methods using MATLAB.

针对突发通信系统需要，对1bit差分解调和2bit差分解调技术进行了研究，在MATLAB中用1bit差分解调技术实现了GMSK信号的调制解调，并对两种解调的性能进行了仿真对比。

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This paper advances an implement scheme of the PAM-UWB system. The scheme adopts the synchronization algorithm which combines the TDT algorithm and slipping correlation, and the differential demodulation method for information recovery.

本文提出了一种PAM-UWB系统的实现方案，该方案采用TDT同步算法与滑动相关相结合的同步算法，在同步实现后采用差分解调实现信息恢复。

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The simulation results show that the performance improvement of proposed algorithm is superior to conventional differential demodulation by 1.4 dB at a BER of 10-4 in AWGN channel.

仿真表明，相对于软判决译码时传统的差分解调，该算法在误比特率BER为10-4时在AWGN信道中有1.4dB的性能改善，在Rician信道中同样有显著的性能改善。

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Thirdly, for differential demodulation, two kinds of timing algorithm and improvements in application are proposed, joint synchronization algorithm and statistical algorithm.

再次，针对差分解调提出了两种定时算法，联合同步法和统计法。

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Design of digital filter is an important part in signal processing. The band-pass, low-pass and delay filters are involved in differential demodulation.

数字滤波器的设计是信号处理中非常重要的环节，在差分解调中涉及到带通、低通和延时滤波器的设计。

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The paper proposes the application of nonredundant error correction in differential demodulation combined with soft-decision decoding.

提出了结合软判决译码的非冗余纠错（nonredundant error correction）在差分解调中的应用。

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We need delivered price for less than $ 0.10 which means your price is way to high.

我们要求含运费价格低于0.10美元,也就是说你们的价格太高.

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