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interference-to-Noise

  • 小面积和大面积光电二极管的低噪声放大器

      Photodiodes can be broken into two categories: largearea photodiodes with their attendant high capacitance(30pF to 3000pF) and smaller area photodiodes withrelatively low capacitance (10pF or less). For optimalsignal-to-noise performance, a transimpedance amplifi erconsisting of an inverting op amp and a feedback resistoris most commonly used to convert the photodiode currentinto voltage. In low noise amplifi er design, large areaphotodiode amplifi ers require more attention to reducingop amp input voltage noise, while small area photodiodeamplifi ers require more attention to reducing op amp inputcurrent noise and parasitic capacitances.

    标签: 光电二极管 低噪声放大器

    上传时间: 2013-10-28

    上传用户:hanbeidang

  • RF至数字接收器的信号链噪声分析

      Designers of signal receiver systems often need to performcascaded chain analysis of system performancefrom the antenna all the way to the ADC. Noise is a criticalparameter in the chain analysis because it limits theoverall sensitivity of the receiver. An application’s noiserequirement has a signifi cant infl uence on the systemtopology, since the choice of topology strives to optimizethe overall signal-to-noise ratio, dynamic range andseveral other parameters. One problem in noise calculationsis translating between the various units used by thecomponents in the chain: namely the RF, IF/baseband,and digital (ADC) sections of the circuit.

    标签: 数字接收器 信号链 噪声分析

    上传时间: 2014-12-05

    上传用户:cylnpy

  • This program includes: [5 7] convolutional code (encoder) + BPSK + AWGN + MAP (decoder). It evaluat

    This program includes: [5 7] convolutional code (encoder) + BPSK + AWGN + MAP (decoder). It evaluates Bit Error Rate and plots it versus SNR(signal to Noise Ratio).

    标签: convolutional includes program encoder

    上传时间: 2015-12-24

    上传用户:bruce5996

  • We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude mo

    We address the problem of blind carrier frequency-offset (CFO) estimation in quadrature amplitude modulation, phase-shift keying, and pulse amplitude modulation communications systems.We study the performance of a standard CFO estimate, which consists of first raising the received signal to the Mth power, where M is an integer depending on the type and size of the symbol constellation, and then applying the nonlinear least squares (NLLS) estimation approach. At low signal-to noise ratio (SNR), the NLLS method fails to provide an accurate CFO estimate because of the presence of outliers. In this letter, we derive an approximate closed-form expression for the outlier probability. This enables us to predict the mean-square error (MSE) on CFO estimation for all SNR values. For a given SNR, the new results also give insight into the minimum number of samples required in the CFO estimation procedure, in order to ensure that the MSE on estimation is not significantly affected by the outliers.

    标签: frequency-offset estimation quadrature amplitude

    上传时间: 2014-01-22

    上传用户:牛布牛

  • Propagation Channel Characterization

    The investigation of the propagation channel is becoming more and more important in mod- ern wireless communication. The demand for spectral efficiency motivates exploitation of all channels that can possibly be used for communications. Nowadays, a common trend for designing physical layer algorithms is to adapt the transceiving strategy, either by maximizing the diversity gains or by utilizing the coherence of the channels to improve the signal-to-noise power ratio.

    标签: Characterization Propagation Channel

    上传时间: 2020-05-31

    上传用户:shancjb

  • 915MHz超高频RFID阅读器射频前端电路设计

    为了提高超高频RFID系统中阅读器在低信噪比的情况下仍具有较高的识别能力,提出一种基于FPGA系统结合软件无线电方法实现超高频RFID射频前端电路方案。超高频射频识别系统必须符合EPC Class 1generation 2标准,所设计的电路系统以Xilinx公司的XC6SLX16-2CSG324FPGA芯片为硬件基础,将数字基带调制解调和中频滤波电路在FPGA系统中设计实现,重点阐述了射频前端电路的设计结构、AD/DA转换电路,以及数字滤波器的设计。实验结果表明,所设计的超高频RFID阅读器简化了前端电路系统结构,提升了稳定性,增强了抗干扰能力。该电路系统在信噪比较低的情况下,能够较好地实现915MHz频率的射频接收和发送。In order to improve the reader UHF RFID system still has a higher ability to identify,in the case of low signal-to-noise ratio.The UHF RFID systems must comply with EPC Class 1 generation 2 standard.In this paper,the design of the circuit system based on Xilinx's XC6SLX16-2CSG324 FPGA chip,and presents UHF RFID RF front-end circuit with software radio based on FPGA system.Digital baseband modem and IF filter circuit is designed and implemented in the FPGA system,and focused on designing the structure of the RF front-end circuit,AD/DA conversion circuits,and digital filter.Experimental results show that the UHF RFID reader de...

    标签: 915mhz 超高频 rfid 阅读 射频 前端 电路 设计

    上传时间: 2022-04-17

    上传用户:shjgzh

  • Adds noise to processes x1(n) and x2(n), at SNR=snr, using seeds s1 and s2.

    Adds noise to processes x1(n) and x2(n), at SNR=snr, using seeds s1 and s2.

    标签: and processes noise seeds

    上传时间: 2015-08-07

    上传用户:宋桃子

  • Abstract:Noise frequency modulation(FM)jamming。which belongs to blanket jamming。is already become t

    Abstract:Noise frequency modulation(FM)jamming。which belongs to blanket jamming。is already become the main form ofnoise jamming at present。because the wideband was gained by it.Tne spectnlnl ofnoise FM jamming is analyzed by time domain autocorrelation method in this paper.It’S jamm g peculiarity and几out— putting signal’S jamming peculiarity ale explained.At last,these time series models ofnoise FM jalllIIling sig— nal and几outputting signal ale built.

    标签: jamming modulation frequency Abstract

    上传时间: 2015-10-17

    上传用户:lijinchuan

  • 2D wave simulation in 3D plot. to help you understand the wave interference phenomenon.

    2D wave simulation in 3D plot. to help you understand the wave interference phenomenon.

    标签: wave interference simulation phenomenon

    上传时间: 2013-12-28

    上传用户:dbs012280

  • to generate the white noise it is very simple.

    to generate the white noise it is very simple.

    标签: generate simple noise white

    上传时间: 2013-12-21

    上传用户:lxm