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ofdm
- 正交频分复用(OFDM,Orthogonal Frequency Division Multiplexing)是一种多载波数字调制技术,也可以被当作一种复用技术。具有频谱利用率高、抗多径干扰等特点,OFDM系统能够有效地抵抗无线信道带来的影响,例如信道的频率选择性衰落,脉冲噪声和共信道干扰的影响。本文主要介绍了OFDM原理的相关知识。-The Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Divisi
Frequency
- 频偏同步,可以实现大频偏下的频偏估计,精度高,范围广!-Frequency offset synchronization can be achieved under large frequency offset offset estimation, high accuracy and wide!
3GPPLTE
- 3GPP LTE关键技术浅析,LTE 改进并增强了空中接口技术,采用 OFDM 及 MIMO 技术作为其无线网络演进的唯一标准。 该文对 OFDM 技术及 MIMO 技术进行了分析,最后提出将OFDM 技术与 MIMO 技术相结合,从而消除由频率选择性衰落带来的影响,达到信息的高速和高可靠性传输。-The key technology of 3GPP LTE, LTE air interface improvements and enhanced technology, the use of O
biyesejitognxinxitong
- 中文摘要 正交频分复用( OFDM , Orthogonal Frequency Division Multiplexing)是当前一种非常热门的通信技术。它即可以被看作是一种 调制技术,也可以被看作是一种复用技术。由于它具有抗多径衰落和频谱 利用率高的特点,因此被广泛应用于高速数字通信领域,比如应用于IEEE 802.11a无线局域网(WLAN)的物理层等等。 我的毕业设计的核心任务是:采用 FPGA 来实现一个基于OFDM 技术 的通信系统中的基带数据处
Frequency-cycle-synchronization
- 基于线性预测编码及音框基频周期同步之高品质语音变换技术页数-Based on linear predictive coding and the frame fundamental frequency cycle synchronization of high-quality voiceTransform technology pages
On-the-residentiall
- 我国目前对噪音污染的治理方法主要有两种:一种是将水泥路 面的改柏油路面第二种是在距离住宅窗户较近的道路两侧安装隔音 屏障。但效果均不理想。路面改变只可降低汽车行驶摩擦声的3~5 分贝左右。至于安装隔音屏障.由于声波的衍射特性,声音的传播可 以跨越隔音屏障,在中频,高频声波传播中,遇到难以穿透的障碍物 时,背面就有一个声波微弱的影区。所以此举只对相近楼层有所缓 解,对更高楼层的住户而言,效果并不明显-Our current treatment methods for noi
Rayleigh-Mie-lidar-
- 本文介绍了用来测量对流层温度垂直分布的基于高光谱分辨率雷达技术的瑞利-米激光雷达系统(激光是对人眼安全的355nm波长的紫外线)。在该系统中,用两个法布里-珀罗标准具滤波器对影响大气温度的两个瑞利信号进行过滤。这些滤波器放在瑞利散射频谱的同一侧,并带有双端口光学输出通道。这种配置对米氏散射能获得较高的抑制比以及合理的瑞利散射透光率。米氏信号用第三个位于激光频率中间位置的法布里-珀罗标准具滤波器进行检测。这三个滤波器的参数是经过数值计算优化了的。实验结果表明,对于这两个瑞利通道都能实现-45dB的
1
- 超紧耦合是 GPS/INS 组合导航系统的最新研究方向,它采用 INS 测得的载体动态信息辅助 GPS 接收机跟踪环 路,消除卫星信号中由于载体与卫星之间相对运动所产生的频率偏移,提高接收机在高动态环境下载波跟踪性能,同时还 可以压缩带宽,有效增强接收机抗干扰性能。介绍 GPS/INS 超紧耦合技术,给出 INS 辅助 GPS 载波跟踪环路结构图和相应 的数学模型,分析 INS 辅助 GPS 跟踪环路在动态环境下的动态残留及其对环路相位误差的影响,并进行了模型仿真,最后 对仿真结
wave-induced-fluid-flow
- 阐述速度频散和衰减现象基本特征的基础上,回顾Biot模型、喷射流模型、BISQ模型、双孔模型、裂缝-孔隙微结构模型和斑块饱和模型等6种主要速度频散与衰减理论模型的研究进程、原理和限制性,利用示意图直观地描述了这些模型的机制,并给出了它们各自的高低频极限、特征频率和适用条件。-Expounded velocity dispersion and attenuation of the basic characteristics of the phenomenon based on a review B
AN2974
- 步进电机细分驱动,快速衰减模式实现降低高频噪音-Stepping Motor Driver, fast decay modes reduce high-frequency noise
17vol2no2
- The objective of this study is improving channel estimation accuracy in OFDM system because channel state information is required for signal detection at receiver and its accuracy affects the overall performance of system and it is essential to impro
2512ijcsa01
- As a multicarrier transmission system Orthogonal frequency division multiplexing (OFDM) has been widely applied in wireless communication systems due to its numerous advantages like robustness against multipath fading and delay, high data rate tr
studies-on-radar-cross-section
- 概述军用飞行目标对微波雷达的散色特性,讨论目标的高频散色机理,RCS分析方法及减缩途径,以及低RCS目标探测技术-Overview military flying targets scattered on color characteristics of microwave radar, discuss the target color high-frequency dispersion mechanism, RCS analysis and reduction pathways, and lo
VLC-using-OFDM
- 将OFDM技术运用在可见光通信的研究,并且把OFDM的高峰均比这一缺点进行了建设性的运用。-In particular, the use of OFDM (orthogonal frequency division multiplexing) for intensity modulation is investigated. The high peak-to-average ratio (PAR) in OFDM is usually considered a disadvant
Accelerometer
- The main application of FreeIMU is orientation sensing: by reading the data from the various sensors is possible to compute precisely the orientation of FreeIMU in the space. Recent boards also feature an high resolution barometer allowing to precise
MM02-ATOM-ESMini-2012-02-10
- MM2是德国MEN公司推出的系列超小型嵌入式CPU模块ESMini家族(95x55mm尺寸)中的一款新产品,基于intel新的E680T处理器,1.6GHz主频,1GB的DDR2 DRAM存储器,全表贴器件;支持2个Gigabit Ethernet, 1个CAN和4个COM扩展口等,提供PCI Express载板扩展口;整板最大5至7瓦的较低功耗,配上半定制的载板,非常适合需要加固应用的工业,移动应用领域。-The MM2 is an ultra-small Computer-On-Modu
Abousaif
- Design and Fabrication of Substrate-Integrated Waveguide (SIW) Filters Using LTCC: Problem Formulation • Introduce a new methodology of designing waveguide inductive strip filters embedded in Low Temperature Co-fired Ceramic (LTCC) &
mb_ftracker
- Abstract—Several algorithms have been developed for tracking formant frequency trajectories of speech signals, however most of these algorithms are either not robust in real-life noise environments or are not suitable for real-time implementati
12.ISCA-RJRS-2013-290
- Application of spread spectrum for satellite land mobile systems is difficult in satellite link because of synchronization and providing code or considerable Doppler shift. This is particularly high for LEO satellites. So that, a Doppler shift carr
2464613103
- 基于小波变换和 HHT 的分布式并网系统谐波检测方法。 该方法利用小波变换多分辨率分析思想对信号进行划分,并对划分后的信号进行经验模态分解,得到一系列的经验模态函数IMF,并从 IMF分量中提取出基波分量和高次谐波;再对IMF分量进行Hilbert 变换得到信号的频率、幅值信息。-Wavelet transform and HHT based distributed systems and network harmonic detection method. The method use