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[VHDL-FPGA-Verilog] random data gen（vhdl）

Description: 任意数据发生器的源代码-arbitrary data source code generator
Platform: | Size: 97280 | Author: 王锋 | Hits:

[Other] pitch_period_estimation

Description: 使用vhdl编写的一段程序。 主要功能是声音周期计算，以区别声音信号与噪音信号。-vhdl prepared by the use of a procedure. Its main function is voice cycle, in order to distinguish voice signal and the noise signal.
Platform: | Size: 10240 | Author: huan Ren | Hits:

[Other] SC-DSC

Description: 数字通信系统的设计及其性能和所传输的数字信号的统计特性有关。所谓 加扰技术，就是不增加多余度而扰乱信号，改变数字信号的统计特性，使其近 似于白噪声统计特性的一种技术。这种技术的基础是建立在反馈移位寄存器序 列（伪随机序列）理论之上的。解扰是加扰的逆过程，恢复原始的数字信号。 如果数字信号具有周期性，则信号频谱为离散的谱线，由于电路的非线 性，在多路通信系统中，这些谱线对相邻信道的信号造成串扰。而短周期信号 经过扰码器后，周期序列变长，谱线频率变低，产生的非线性分量落入相邻信 道之外，因此干扰减小。 在有些数字通信设备中，从码元“0”和“1”的交变点提取定时信息，若 传输的数字信号中经常出现长的“1”或“0”游程，将影响位同步的建立和保 持。而扰码器输出的周期序列有足够多的“0”、“1”交变点，能够保证同步 定时信号的提取。 -digital communication system design and performance and the transmission of digital signals on the statistical characteristics. The so-called scrambling technology is not to increase the degree to disrupt redundant signal, digital signal change the statistical properties it is similar to white noise statistical characteristics of a technology. This technology is based on feedback shift register sequences (pseudo-random sequence) of the above theory. Decryption is the reverse of the scrambling process, the restoration of the original digital signal. If the digital signal is cyclical, the signal spectrum of discrete lines, as the nonlinear circuit, in multi-channel communication system, these lines of the adjacent channel signal causing crosstalk. And the short-cycle signal after scrambling
Platform: | Size: 113664 | Author: 葛岭泉 | Hits:

[SCM] NoiseCancel1

Description: 噪生消除的VRILOG实现，能很好的滤出低频噪生。-Noise Health VRILOG eliminated realize that can filter out a good low-frequency noise of Health.
Platform: | Size: 2681856 | Author: 李永杰 | Hits:

[VHDL-FPGA-Verilog] vhdl

Description: 伪随机码发生器的VHDL实现 随着通信理论的发展，早在20世纪40年代，香农就曾指出，在某些情况下，为了实现最有效的通信，应采用具有白噪声的统计特性的信号。另外，为了实现高可靠的保密通信，也希望利用随机噪声。然而，利用随机噪声最大困难是它难以重复产生和处理。直到60年代，伪随机噪声的出现才使这一难题得到解决-Pseudo-random code generator for VHDL realize communication with the development of the theory, as early as the 20th century, 40 years, Shannon has pointed out that in some cases, in order to realize the most effective communications, should be used with the statistical properties of white noise signal . In addition, in order to realize highly reliable secure communication, but also wish to take advantage of random noise. However, the use of random noise the greatest difficulty is that it difficult to repeat the generation and treatment. Until 60 years, the emergence of pseudo-random noise so that this problem only be solved
Platform: | Size: 217088 | Author: 张之晗 | Hits:

[matlab] FSKxinhaochafenxitong

Description: FSK差分检波系统仿真的课程设计 本课程设计主要利用MATLAB集成环境下的Simulink仿真平台，设计一个FSK信号差分检波系统。观察FSK调制前后的信号波形,并对调制前后信号的频谱进行分析,再以调制信号为输入，构建差分检波解调系统电路，观察解调前后的信号波形，并对解调前后信号的频谱进行分析。加入噪声分析通过三种不同信道FSK信号差分检波系统接受信号的性能。仿真结果，基本达到课程设计要求。-FSK differential detection system simulation of the curriculum design of this course the main use of MATLAB integrated design environment of Simulink simulation platform, the design of a FSK signal differential detection system. Observed before and after FSK modulation signal waveforms, and modulation signal spectrum before and after analysis, and then modulated signal as input, build a system of differential detection demodulator circuits, observe the pre-and post-demodulation signal waveforms, and signal demodulation spectrum before and after analysis. Adding noise analysis through the three different channel FSK signal differential signal detection system to accept performance. The simulation results, the basic courses to meet the design requirements.
Platform: | Size: 652288 | Author: 球球 | Hits:

[GPS develop] rng

Description: 通信系统中的噪声发生器，可用于ＣＤＭＡ信号源电路。-Communication system noise generator can be used for CDMA signal source circuit.
Platform: | Size: 1024 | Author: Li Gengmin | Hits:

[Software Engineering] DDS

Description: 本设计基于数字频率合成技术,采用正弦查找表实现波形产生.直接数字频率合成技术（DDS）是一种先进的电路结构，能在全数字下对输出信号频率进行精确而快速的控制，DDS技术还在解决输出信号频率增量选择方面具有很好的应用，DDS所产生的信号具有频率分辨率高、频率切换速度快、频率切换时相位连续、输出相位噪声低和可以产生任意波形等诸多优点。 文中介绍了DDS的基本原理，对DDS的质谱及其散杂抑制进行了分析。程序设计采用超高速硬件描述语言VHDL描述DDS,在此基础上设计了正弦波、三角波、方波等信号发生器，。完成了软件和硬件的设计，以及实验样机的部分调试。 -The design is based on a digital frequency synthesis technology, to achieve wave synthesis by sine wave look-up tables. Direct Digital Synthesis Technology (DDS) is an advanced circuit structure, the output signal frequency is controlled precisely and rapidly in all-digital process, DDS technology has been applied in output signal frequency increment. DDS signals generated own high frequency resolution, frequency switching speed and continuous phase when frequency switching, low-output phase noise and can generate arbitrary waveform, and so on. Basic principles of the DDS is introduced in the paper, frequency form and stray inhabitation of the DDS is analyzed. Procedures designed with high-speed hardware description language VHDL describe DDS, and design a sine wave, triangle wave, square-wave signal generator by it.The hardware and software has been designed, prototype and circuit has been tested partly.
Platform: | Size: 312320 | Author: 蓝 | Hits:

[Software Engineering] FPGA

Description: 基于FPGA数字乘法器的设计：数字乘法嚣是目前数字信号处理中运用最广泛的执行部件之一，本文设计了三种基于FPGA 的数字乘法器．分别是移位相加乘法嚣、加法器树乘法器和移位相加一加法嚣树混合乘法器。通过对三种方案的仿真综合以厦速度和面积的比较指出了混合乘法器是其中最佳的设计方案-FPGA-based digital multiplier design: the number of multiplicative noise is the use of digital signal processing in the most extensive one of the implementation of components, the paper design of the three types of FPGA-based digital multiplier. Shift sum are noise multiplication, adder tree multiplier and the sum of a displacement hybrid adder tree multiplier noise. Through the simulation of three options to building a comprehensive comparison of the speed and size that the multiplier is one of the best hybrid design
Platform: | Size: 147456 | Author: 南才北往 | Hits:

[VHDL-FPGA-Verilog] Verilog_code_for_AWGN

Description: verilog实现awgn信道噪声的代码，支持可变的信噪比。利用移位寄存器来实现伪随机序列。-verilog code for implementation of awgn channel noise. support variable snr. use LSFR to implement the pseudo random sequence.
Platform: | Size: 10555392 | Author: xiejin | Hits:

[DSP program] fangz

Description: 数字通信系统的仿真，包括调制解调，上下变频，加入了高斯白噪声，并且每个步骤都生成相应的图形-Digital communication system simulation, including the modulation and demodulation, the upper and lower frequency, by adding Gaussian white noise, and each step generates the appropriate graphics
Platform: | Size: 34816 | Author: maominchao | Hits:

[VHDL-FPGA-Verilog] mid_filter

Description: 中值滤波的实现，用于图像的预处理。取出图像噪声-Implementation of median filter for image preprocessing. Remove image noise
Platform: | Size: 5120 | Author: 一 | Hits:

[VHDL-FPGA-Verilog] noise

Description: 随机噪声产生代码。所输出的随机噪声可以用于模拟信道中的加性噪声。-Random noise generated code. The output of the random noise can be used to simulate the channel additive noise.
Platform: | Size: 1024 | Author: simulin_2008 | Hits:

[VHDL-FPGA-Verilog] medianfilter

Description: 图像滤波中的中值滤波，有效滤除椒盐噪声，使用verilog语言编写-Image filtering in the median filter, effectively filter out salt and pepper noise, using verilog language
Platform: | Size: 3262464 | Author: 钱军 | Hits:

[VHDL-FPGA-Verilog] noise.vhd

Description: noise in vhdl format
Platform: | Size: 9216 | Author: suhirdham | Hits:

[VHDL-FPGA-Verilog] noise-cancellation-.vhd

Description: noise cancellation in vhdl format
Platform: | Size: 9216 | Author: suhirdham | Hits:

[Other] vhdl-fec

Description: vhdl implimentation using forward error correcting codes this will incresing signal to noise ration
Platform: | Size: 183296 | Author: yogesh | Hits:

[Other] vhdl-lms

Description: The program using the MATLAB simulation and VHDL implementation of LMS adaptive filter, filter the 50Hz sinusoidal frequency noise
Platform: | Size: 18432 | Author: li | Hits:

[Software Engineering] 0424

Description: Using high-order cumulants of MPSK signal modulation recognition, The final weight matrix is ??the filter coefficient, Including compression ratio, image restoration computing uptime and peak signal to noise ratio.
Platform: | Size: 4096 | Author: abwnqa | Hits:

[SCM] myqxr

Description: LFM pulse compression of the Matlab program, Including the final calculation of the compressed image peak signal to noise ratio and compression of the source, Achieve a grayscale image and further control for video surveillance.
Platform: | Size: 6144 | Author: quipangang | Hits:
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