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Description: 为解决直接序列扩频系统的数字收发机中初始频率的捕获问题，提出了一种通过DFT变换，在频域
上进行抛物插值运算的频偏估计的算法。该算法可适应低信噪比、宽频率偏移范围的恶劣通信环境和突发的通信
模式，且算法复杂度较低。该算法已在FPGA 中实现。-To address the direct sequence spread spectrum system, the number of transceivers in the initial frequency of the capture problem, a transformation through the DFT, in the frequency domain for parabolic interpolation computing frequency offset estimation algorithms. The algorithm can be adapted to low signal to noise ratio, broadband rates offset the scope of bad communications environment and unexpected modes of communication, and the algorithm complexity low. The algorithm has been realized in the FPGA.
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Size: 63488 |
Author: 赵平 |
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Description: 一个生成指定波形的宽带噪声的程序代码，非常好用，可以试验下-A specified waveform generating broadband noise code, very easy to use, you can test under
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Size: 1024 |
Author: lilei |
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Description: 高斯噪声环境下宽带矢量信号仿真-Gaussian noise environment simulation of broadband vector signal
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Size: 1024 |
Author: 长城 |
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Description: 一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN(加性高斯白噪声信道)信道(AWGN信道：不考虑通信信道信号时，由宽频范围描述的统计随机无线噪声。)。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。-A four-user spread spectrum communication system, spreading gain for N = 16, using Walsh code Direct Sequence Spread Spectrum, BPSK modulation, channel for AWGN (additive white Gaussian noise channel) channel (AWGN channel: do not consider communication channel signals, described by the scope of broadband wireless random statistical noise.). At the receiving end for despreading, demodulation, judgments, through the simulation to be one of a user' s bit error rate and SNR of the simulation results.
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Size: 9216 |
Author: jehuty |
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Description: 匹配滤波的实际仿真程序。分别对宽带和窄带信号进行了仿真，并且求的滤波后信号的信噪比。-Matched filtering of the actual simulation program. Separately for broadband and narrowband signals, simulation, and after filtering for signal-noise ratio.
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Size: 1024 |
Author: lizhao |
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Description: 本设计分为四个模块，分别是：信号前向调整模块，数据采集模块，数据输出模块和控制模块。信号前向调整模块采用高速低噪音模拟开关(MAX4545)和宽带运算放大器(MAX817)构成可编程运算放大器，对幅度不等的输入信号分别进行不同等级的放大处理-The design is divided into four modules, namely: the signal prior to adjustment module, data acquisition module, data output module and control module. Signal adjustment module to the high-speed low-noise analog switch (MAX4545) and broadband operational amplifier (MAX817) constitutes a programmable operational amplifier, the amplitude of the input signal range were dealing with different levels of amplification
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Size: 92160 |
Author: 无 |
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Description: 宽带信号产生程序，高斯噪声通过滤波器产生，希望对大家有帮助。-this is a wideband signal generation program. Geting broadband signal by make aussian noise go through the filter.
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Size: 1024 |
Author: 王伟 |
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Description: 1.设计自适应信号分离器，用以从白噪声中提取周期信号。其中选取正弦信号s=sin(2*pi*t/10)为周期信号，宽带噪声信号为高斯白噪声，设置参考通道延迟为50。
2.宽带信号中的窄带干扰抑制实际上是自适应信号分离的一种应用，借助自适应信号分离器可以方便的实现窄带干扰的对消。-1. Design of adaptive signal separator, used to extract from the white noise periodic signal. The extraction of sinusoidal signals s = sin (2* pi* t/10) for periodic signals, broadband noise signal is Gaussian white noise, set the reference channel delay of 50.
2. Wideband signals in the narrow-band interference suppression is actually an application of adaptive signal separation, using adaptive signal separator can be easily achieved narrowband interference cancellation.
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Size: 1024 |
Author: wanchun |
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Description: 将正弦波与宽带噪声分离开来，并提取正弦波信号-The sine wave and separated from the broadband noise, and extract the sine wave signal
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Size: 1024 |
Author: lemon |
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Description: 项目中宽带噪声干扰性能的研究，有详细的MATLAB代码以及注释-Broadband noise performance of the project research, a detailed MATLAB code and comments
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Size: 9216 |
Author: 谢坚 |
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Description: 自适应信号 利用自适应信号分离器，可以有效的从白噪声中提取周期信号。现选取信号为正弦信号 ，宽带噪声信号为高斯白噪声，延迟D=50；收敛因子为 和 时的滤波效果。-Adaptive signal using adaptive signal separator, white noise can be effectively extracted from the periodic signal. Select the signal is sinusoidal signal, broadband noise signal is Gaussian white noise, the delay D = 50 convergence factor, and when the filtering effect.
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Size: 7168 |
Author: 叶赫 |
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Description: 针对双极性、单极性码产生直扩系统，并加上宽带噪声干扰，-For bipolar, unipolar codes have a direct expansion system, and with broadband noise,
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Size: 1024 |
Author: yuyingying |
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Description: G.720.1是ITU-T最新制定的语音标准，其主要包括活动话音检测、语音和噪声分类功能，可以适用与宽带和窄带语音。-G.720.1 is a newly developed speech standard ITU-T, which mainly includes a voice activity detection, voice and noise classification function can be applied with both broadband and narrowband voice.
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Size: 472064 |
Author: 张勇 |
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Description: 有源噪声控制(ANC)主要基于LMS算法,但在处理宽带噪声信号和低信噪比情况下,效果不好.影响控制效果的主要原因是输入信号的自相关分布.而小波变换具有消除信号自相关的作用.因此将小波变换引入有源噪声控制(ANC)是解决问题的一种办法-Active noise control (ANC) is mainly based on the LMS algorithm, but ineffective in dealing with the situation of the broadband noise signal and low signal-to-noise ratio, the main reason affecting the control effect of autocorrelation distribution of the input signal. Wavelet transform to eliminate signalautocorrelation role Thus the wavelet transform is a problem-solving approach to the introduction of the active noise control (ANC)
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Size: 17408 |
Author: loneydear |
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Description: 宽带波束形成，设计FIR滤波器系数。带宽为500Hz--700Hz,采样率为3000Hz，对白噪声序列进行滤波，即得到有限带宽的宽带时域信号-Broadband beamforming design FIR filter coefficients. Bandwidth of 500Hz- 700Hz, sampling rate of 3000Hz, filtered white noise sequence, ie limited bandwidth broadband time domain signal
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Size: 1024 |
Author: 何李 |
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Description: 噪声功率比(NPR)这个概念自频分多路复用(FDM)电话系统诞生之初即已出现。简单而
言，NPR用于衡量多通道系统中当其他通道上存在随机活动时，某个闲置通道的“安静”程
度。噪声和交调失真产物进入该闲置通道，从而降低性能。该概念最初用来检查FDM链
路中的4 kHz宽语音通道，如今，在确定多通道宽带通信系统的特性时也是有用的——但在
现代测量技术方面，存在一些重要的区别。-The concept of the noise power ratio (NPR) from the frequency division multiplexing (FDM) had emerged at the beginning of the birth of the telephone system. Nutshell, NPR used to measure multi-channel system when random events on the other channel, a the idle channel' s " quiet" level. Noise and intermodulation distortion products into the idle channel, thereby reducing performance. The concept was originally used to check the FDM link 4 kHz wide voice channel, now, in determining the characteristics of multi-channel broadband communication system is useful- but in modern measurement techniques, there are some important differences.
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Size: 594944 |
Author: 边城 |
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Description: 对设备进行故障诊断的主要方法就是测量故障
设备的振动或噪声, 并对其进行分析, 从而找出故障原因。然而振动或噪声信号中除了对分析故障有用的信息外, 还有大量的噪声成分。只有有效地滤除噪声, 才能获得有用的信息, 从而得到可靠的分析结论。传统的滤噪方法是将被噪声污染的信号通过一个滤波器, 滤掉噪声频率成分。但对于短时瞬态信号、非平稳信号、含宽带噪声的信号, 采用传统处理方法有着明显的局限性。小波变换为信号去噪提供了一种有效的方法, 小波阈值去噪具有传统方法不可比拟的优越性。但是小波分解的频域重叠性和阈值选取的不确定性, 使得小波阈值去噪法有也不能得到理想效果。-Equipment fault diagnosis method is to measure the fault
Equipment vibration or noise, and its analysis in order to identify the cause of the malfunction. Vibration or noise signals, however, in addition to the analyze fault useful information, there is a lot of noise components. Only effectively filter out the noise in order to obtain useful information, to obtain reliable conclusions. Traditional filtering method based noise pollution signal through a filter to filter out the noise frequency components. But for the short-term transient signal, non-stationary signals, including broadband noise signal, using the traditional approach has obvious limitations. The wavelet transform provides an effective method for signal de-noising, wavelet thresholding has incomparable superiority of traditional methods. Wavelet frequency domain overlap threshold uncertainty, the wavelet thresholding method can not get the desired effect.
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Size: 267264 |
Author: 哈哈 |
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Description: DFT和FIR宽带波束形成源程序 可以自行设置参数 如载频强度 入射角度 信噪比等-DFT and FIR broadband beamforming source code can set the parameters such as the intensity of the incident angle of the carrier frequency signal to noise ratio, etc.
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Size: 3072 |
Author: 张正鑫 |
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Description: 设有一个随机信号 服从AR(4)过程，它是一宽带过程，参数如下：
我们通过观测方程 来测量该信号， 是方差为1的高斯白噪声，用LMS算法和RLS算法通过观测方程来估计原信号。并用Matlab对此问题进行仿真。
-There is a random signal obedience AR (4) process, which is a broadband process parameters are as follows: We are measured by observing the signal equation is a Gaussian white noise variance, with the LMS algorithm and RLS algorithm to estimate the observation equation the original signal. This issue with Matlab simulation.
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Size: 1024 |
Author: 程飞 |
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Description: 设计自适应信号分离器，用以从白噪声中提取周期信号。其中选取正弦信号s=sin(2*pi*t/10)为周期信号，宽带噪声信号为高斯白噪声，设置参考通道延迟为50。-Design of the adaptive signal splitter for extracting a periodic signal from the white noise. Wherein the selected sinusoidal signal s = sin (2* pi* t/10) periodic signal, broadband noise is Gaussian white noise signal, the delay is set to the reference channel 50.
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Size: 1024 |
Author: yhr |
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