Ratio
共 94 篇文章
Ratio 相关的电子技术资料，包括技术文档、应用笔记、电路设计、代码示例等，共 94 篇文章，持续更新中。
基于单片机的教室智能照明系统
<p>本文主要介绍了一种AT89S52单片机为核心的教室灯光自动控制系统,针对学校商场等室内灯光的控制现状以及大量浪费能源浪费问题详述了系统的硬件设计和软件设计思路。重点研究了热释红外传感器如何检测人体的存在和光敏三极管构成的电路如何检测环境光的强度。根据教室里的自然条件,系统会通过对人体信号的检测和光照强度的信号识别自动加以判断,构成对教室照明回路的智能控制。该系统控制方便可靠,节约成本性价比高
FPGA技术的微弱GPS信号实时处理
普通GPS接收机在特殊环境下，如在高楼林立的城市中心，林木遮挡的森林公路，特别是在隧道和室内环境的情况下，由于卫星信号非常微弱，载噪比（Carrier Noise Ratio，C/No）通常都在34dB-Hz以下，很难有效捕获到卫星信号，导致无法正常定位。恶劣条件下的定位有广阔的发展和应用前景，特别是在交通事故、火灾和地震等极端环境下，快速准确定位当事者所处位置对于降低事态损失和营救受伤者是极为重
天线基本知识
第一讲 天线的基础知识
1.1 天线的输入阻抗
1.2 天线的极化方式
1.3 天线的增益
1.4 天线的波瓣宽度
1.5 前后比(FRONT-BACK RATIO)
第二讲 天线的分类与选择
2.1 全向天线
2.2 定向天线
2.3 机械天线
2.4 电调天线
2.5 双极化天线
第三讲 移动通信系统天线安装规范
第四讲 移动通信系统天线参数调整
4.1 天线高度的
射频技术重点入门基础 天线射频RF基础
射频技术重点入门基础 天线射频RF基础频率和波长及线缆电介常数关系
相位和波长关系
什么是dB和dBm
回波损耗(RL)和驻波比(VSWR)关系
阻抗和衰减
互调(IM3,PIM)
ＲＦ天线常用指标：
极化 ( Polarisation )
波束宽( Beamwidth)
旁瓣抑制 (Side Lobe Suppression)
下倾角 (Down Tilt)
前后比 (Fr
PCIE3.0/4.0接收端（RX）介绍及其测试解决方案
<p>• PCIe 3.0 introduced formal Rx testing</p><p>• Based on stress testing of the DUT in loopback</p><p>◦ Looped back data must be the same as stressed data</p><p>• DUT must support loopback initializ
MT7628手册（英文版）
<p>The following table covers the main features offered by the MT7628KN and MT7628AN. Overall, the MT7628KN supports the requirements of an entry level AP/router, while the more advanced MT7628AN supp
GD32F103数据手册（英文）
<p>The GD32F103xx device is a 32-bit general-purpose microcontroller based on the ARM?</p><p>Cortex?-M3 RISC core with best ratio in terms of processing power, reduced power consumption and peripheral
MT7628 Datasheet
<p>Overview The MT7628 router-on-a-chip includes an 802.11n MAC and baseband,a 2.4 GHz radio and FEM,a 575/580<br/>MHz MIPS? 24K% CPU core,a 5-port 10/100 fast ethernet switch. The MT7628 includes eve
915MHz超高频RFID阅读器射频前端电路设计
<p>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
Stochastic Geometry and Wireless Networks
A wireless communication network can be viewed as a collection of nodes, located in some domain, which<br />
can in turn be transmitters or receivers (depending on the network considered, nodes may be
SC-FDMA+for+Mobile+Communications
The single-carrier frequency division multiple access (SC-FDMA)<br />
system is a well-known system that has recently become a preferred<br />
choice for mobile uplink channels. This is attributed to
Propagation Channel Characterization
The investigation of the propagation channel is becoming more and more important in mod-<br />
ern wireless communication. The demand for spectral efficiency motivates exploitation of<br />
all channe
How to find compression ratio of image file
How to find compression ratio of image file
maximum ratio combining
maximum ratio combining
In 揚erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a di
In 揚erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multip
This file is a function under matlab which allow to compute and plot Amplitude modulation : AM. We c
This file is a function under matlab which allow to compute and plot Amplitude modulation : AM. We can observe the effect of the information parameter can be changed such as amplitude and modulation r
AN OVERVIEW OF PEAK-TO-AVERAGE POWER RATIO REDUCTION TECHNIQUES FOR MULTICARRIER TRANSMISSION
AN OVERVIEW OF PEAK-TO-AVERAGE POWER RATIO REDUCTION TECHNIQUES FOR MULTICARRIER TRANSMISSION
We analyze, both analytically and numerically, the effectiveness of cloaking an infinite cylinder f
We analyze, both analytically and numerically, the effectiveness
of cloaking an infinite cylinder from observations by electromagnetic
waves in three dimensions. We show that, as truncated approxima
Optimisation of the pilot-to-data power ratio in the wireless MIMO-OFDM system with low-complexity
Optimisation of the pilot-to-data power ratio in the wireless MIMO-OFDM
system with low-complexity MMSE channel estimation
SD card controller can just read data using 1 bit SD mode. I have written this core for NIOS2 CPU,
SD card controller can just read data using 1 bit SD mode.
I have written this core for NIOS2 CPU, Cyclone, but I think it can works
with other FPGA or CPLD. Better case for this core is SD clock =