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Description: 摘要:正交频分复用(OFDM)是第四代移动通信的核心技术。该文首先简要介绍了OFDM基本原理,重点研究了理想同步情
况下,保护时隙(CP)和不同的信道估计方法在高斯信道和多径瑞利衰落信道下对OFDM系统性能的影响。在给出OFDM系
统模型的基础上,用MATLAB语言实现了整个系统的计算机仿真并给出参考设计程序。最后给出在不同的信道条件下,保
护时隙、信道估计方法对OFDM系统误码率影响的比较曲线,得出了较理想的结论。
-O FDM is the key techno logy of 4G in the field of mobile comm unication.In this article O FDM
ba sic p rinc ip le is briefly in troduced.Then,the influence of CP and d iffe rent channe l e stim a tion on the system
pe rfo rm ance is emp ha tica lly analyzed respectively in Gauss and R ayle igh fading channe ls in the cond ition of ideal
synchronization.B e sides,based on the given system mode l O FDM system is compu te r sim u la ted w ith MA TLAB
language and the refe rentia l design p rocedure is given.Fina lly,the B ER cu rves of CP and channe l e stim ation a re
given and comp ared.The conclusion is sa tisfac to ry.
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Size: 9216 |
Author: 海之魂 |
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Description: 在NS2下，介绍自适应的RED算法主动队列管理算法，主要原理，希望对大家有帮助-Under NS2, introduced that the auto-adapted RED algorithm driving queue management algorithm, the main principle, hoped has the help to everybody. .
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Size: 3518464 |
Author: wensha |
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Description: 拥塞控制的几种算法，包括red,blue等经典算法。-red algorithms
Platform: |
Size: 41984 |
Author: 刘杨 |
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Description: gdal库读入图像的源码。实现bmp tiff gif jpg img 等格式文件的读取-using gdal lib to load images. bmo tiff gif jpg img files ared included
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Size: 1421312 |
Author: zy |
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Description: ACOUNT： 用于A 方向灯的时间显示，8 位，可驱动两个数码管；
BCOUNT： 用于B 方向灯的时间显示，8 位，可驱动两个数码管。*/
module traffic(CLK,EN,LAMPA,LAMPB,ACOUNT,BCOUNT)
output[7:0] ACOUNT,BCOUNT
-reg[7:0] numa,numb
reg tempa,tempb
reg[2:0] counta,countb
reg[7:0] ared,ayellow,agreen,aleft,bred,byellow,bgreen,bleft
reg[3:0] LAMPA,LAMPB
always @(EN)
if(!EN)
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Size: 5383168 |
Author: kiss123 |
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Description: 自己修改的基于closed-form的程序，对外国程序在时间上有两倍的改善，能对在复杂背景下的图片，通过画一些简单的前景线，背景线，抠图出前景-it is about matting foreground when the interested ared is located under complixed background,and then choosing some other beautiful background,you can create new image,which brings you some special feelings.thanks.
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Size: 29696 |
Author: yandong |
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Description: 改进的ARED算法，实现低时延，低丢包率，高吞吐量，并且能够稳定队列长度。-Improved ARED algorithm, low time delay and high throughput.
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Size: 13312 |
Author: riger rao |
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Description: This file consists of implementation of a class AndroidUsbWdfObject that encapsulates a basic extension to all KMDF objects. Currently, device and file object extensions ared derived from it.
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Size: 1024 |
Author: souxiha |
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Description: 设计了一种Ｐ波段的宽带端射天线。该天线以传统八木天线为基础，将振子尺寸缩小为原来的一半，并将振子放置在金属平板上，进而对天线的反射器和引向器进行改进，并通过对天线参数的仿真优化，最终将天线的带宽扩展到了３８．４％，并保证了频带内相对较高的增益。仿真结果表明，天线能够在０．５～０．８ＧＨｚ的频带之内实现良好端射，并保证带内回波损耗均在－１０ｄＢ以下，整个频段内天线的方向性系数均在８．６ｄＢｉ以上。-In this paper, a systematic design technique for
quadruple-ridged fl ared horn antennas is presented, to enhance
the radiation properties through the profi ling of the ridge taper.
The technique relies on control of the cutoff frequencies of spe-
cifi c modes inside the horn, instead of brute-force optimization.
This is used to design a prototype antenna as a feed for an off-
set Gregorian refl ector system, such as considered for the Square
Kilometer Array (SKA) radio telescope, to achieve an optimized
aperture effi ciency 2 to 12 GHz. The antenna is employed
withaquadraxialfeedingnetworkthatallowstheexcitationofthe
fundamental TE11 mode, while suppressing all other modes that
causes phase errors in the aperture. Measured results confi rm the
validity of this approach, where good agreement is found with the
simulatedresults.
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Size: 1034240 |
Author: phasedarray |
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