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摘要:基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向,交频分复用
OFDM)是一种无线环境下的高速传输技术,它对高速列车控制信息传输中卞要受到的由于多
径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和
基本原理,然后在计算机上用M atlal〕对其性能进行了仿真,仿真中将OFDM与传统的单载波
调制方式—i1,交振幅调制( 1frQAM)对抗多径十扰的性能进行了比较,最后分析了一者的仿真结果.
-Abstract: Based
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OFDM(正交频分复用)技术实际上是MCM(Multi-Carrier Modulation,多载波调制)的一种。其主要思想是,将信道分成若干正交子信道,将高速数据信号转换成并行的低速子数据流,调制到在每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开,这样可以减少子信道之间的相互干扰(ICI)。每个子信道上的信号带宽小于信道的相关带宽,因此每个子信道上的可以看成平坦性衰落,从而可以消除符号间干扰。而且由于每个子信道的带宽仅仅是原信道带宽的一小部分,信道均衡变得相对容-OFDM (
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UWB关于频域划分和频率匹配的论文。很有用!-UWB on the frequency-domain and frequency division of matching papers. Very useful!
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关于多输入多输出正交频分复用(MIMO_OFDM)的博士学位论文,希望能对大家有帮助。-With regard to multiple-input multiple-output orthogonal frequency division multiplexing (MIMO_OFDM) Ph.D. thesis, hoping to be helpful to everyone.
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光纤射频传输系统中相干正交频分复用的研究,介绍了系统的结构和性能,是一份很不错的学习材料。-Coherent optical fiber radio transmission system using orthogonal frequency division multiplexing, introduces the system structure and performance, is a very good learning materials.
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【摘要】本设计是基于AT89C2051单片机的软硬件系统设计,硬件电路包括信号预处理电路、波形转换电路、波形整形及分频电路、显示电路,它们在本文中都有详细介绍。在单片机设计中应用单片机的数字运算和控制功能实现了测频量程的自动切换,满足了时间要求和精度要求。
【关键词】频率计;分频;AT89C2051 -【Abstract】This paper presents a design for frequency meter based on AT89C2051 Single-Chip Microc
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THEORY OF
CODE DIVISION
MULTIPLE ACCESS
COMMUNICATION
The objective of this book is to provide an introduction to code division multipleaccess
(CDMA) communications. Our motivation for emphasizing CDMA communication
is a result of the tec
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正交频分复用系统的性能仿真分析Orthogonal frequency division multiplexing system performance simulation analysis-Orthogonal frequency division multiplexing system performance simulation analysis
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实现输入信号的移相,分频。并可在示波器上观察李萨育图。-To achieve a phase shift of the input signal, the frequency division. And outlook on the oscilloscope Lissajous sterile Figure.
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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 fr
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Orthogonal frequency division multiplexing (OFDM) is becoming the chosen
modulation technique for wireless communications. OFDM can provide large data
rates with sufficient robustness to radio channel impairments. Many research centers
in the w
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Simulation-based performance analysis and
improvement of orthogonal frequency
division multiplexing – 802.11p system
for vehicular communications
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实现数字钟的功能1. 时钟模块:由555振荡器提供时钟,经分频对计数器提供计数时钟信号;
2. 秒钟模块:对秒进行60进制循环计数,并向分钟产生进位,同时具有调分功能;
3. 分钟模块:对分进行60进制循环计数,并向小时产生进位,同时具有调时功能;
4. 小时模块:对小时进行24进制循环计数;
5. 报时模块:在整点时报警,持续约1秒钟;
6. 闹钟模块:在所设定的点进行闹铃,持续1分钟,可以中断;
7. 年月日模块:可以正常地显示年月日。
-To realize t
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This paper investigates the feasibility of Orthogonal Frequency Division Multiplexing
(OFDM) as a modulation technique for a ROF.
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ABSTRACT
In this paper, the design and implementation of OFDM system along with Multi-Point Square Mapping combined with PTS (M-PTS) technique has received much attention in reducing the high peak to average power ratio (PAPR) of Orthogonal Frequen
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ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING FOR WIRELESS COMMUNICATIONS
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runSim -Single Carrier Frequency
Division Multiple Access
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程序中的变量TL1决定着分频系数,其值乘以2即为分频系数。
改变其值可以得到相应的分频输出波形(方波)。
P1^1为输出管脚,将其连接示波器可以看到分频后的波形。-Program variables TL1 determines the frequency division coefficient, the value multiplied by 2 is the frequency division coefficient.
Change the value of th
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Orthogonal Frequency Division Multiplexing
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分频器,利用quartus软件或者modelsim软件对频率进行分频,也可在硬件上观察出对信号的分频-Frequency divider, quartus software or modelsim software is used to analyse the frequency divider, can also be used on hardware to detect the signal frequency division
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