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this file perform sensor nodes
Date : 2025-12-29 Size : 119kb User : good

应用MATLAB小波工具箱中的一维小波包分析函数,采用默认阈值、调节后的阈值两种方法对含噪声的信号进行处理,并以一可见吸收光谱降噪为例,说明该方法在信号降噪中有效可行. -Application of MATLAB wavelet toolbox one dimensional wavelet packet analysis function, using the default threshold value, the adjusted threshold value of two kinds of methods including noise signal processing, and with a visible absorption spectrum noise reduction as an example to show the method is effective in signal noise reduction is feasible.
Date : 2025-12-29 Size : 26kb User : 庞震

Wireless sensor networks (WSNs) have been widely studied in a lot of areas recently. In this paper, we present a method to examine the validity of distributed beamforming for source location in WSNs, by considering the effect of position errors, element failure, and environment noise, which often occur in practice. Computer simulation results show that even though the three errors exist, the direction of a sensor can still be estimated through the beampattern based on distributed beamforming (BF). The benefit of the distributed BF is that almost no additional hardware is required, which guarantees the sensors to be small and low-cost.
Date : 2025-12-29 Size : 276kb User : ahmad

In this transmission system, the input signal bits are first mapped into complex-valued symbols {sn}, according to its modulation type. The in-phase and quadrature components of the symbol will be multiplied with the high frequency carrier and be transmitted over the additive white Gaussian noise (AWGN) channel. On the demodulator side, the received signal is demodulated with correct carrier phase into its in-phase and quadrature components, and sampled with the correct timing intervals, ts=nT. The equalizer can be considered as a part of the demodulator. The input to the equalizer is the {rn} sequence, which represents the complex-valued symbols with ISI distortion, and the output is the soft decision result, which is the probability of each received bit being „ 1‟ or „ 0‟ .-In this transmission system, the input signal bits are first mapped into complex-valued symbols {sn}, according to its modulation type. The in-phase and quadrature components of the symbol will be multiplied with the high frequency carrier and be transmitted over the additive white Gaussian noise (AWGN) channel. On the demodulator side, the received signal is demodulated with correct carrier phase into its in-phase and quadrature components, and sampled with the correct timing intervals, ts=nT. The equalizer can be considered as a part of the demodulator. The input to the equalizer is the {rn} sequence, which represents the complex-valued symbols with ISI distortion, and the output is the soft decision result, which is the probability of each received bit being „ 1‟ or „ 0‟ .
Date : 2025-12-29 Size : 18.29mb User : uunuu0717

program to ecxiute noise removal from image
Date : 2025-12-29 Size : 103kb User : revathy

DL : 0
program to ecxiute noise removal from image
Date : 2025-12-29 Size : 37kb User : revathy

DL : 0
2FSK信号的解调也有相干解调和包络解调两种,本程序为2FSK滤波器的调制与相干解调及抗噪声性能分析仿真程序。 -2FSK demodulated signals have two coherent demodulation demodulation and envelope, the procedures for modulation and coherent demodulation 2FSK filter and anti-noise performance analysis and simulation program.
Date : 2025-12-29 Size : 5kb User : 杜丽娟

DL : 0
Pattern Recognition bayes discriminant analysis algorithm, Target can be extracted in a picture you want, Realize image watermarking, de-noising, plus noise and other functions.
Date : 2025-12-29 Size : 4kb User : lunnanghiupei
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