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Description: 对于移动通信系统主要有两类衰落：大规模衰落和小规模衰落。大规模衰落表示由于大范围内移动而引起的平均信号能量的减少或路径损耗。而小规模衰落则表现为两种机制：信号的时延扩展和信道的时变特性。对于无线应用，信道的时变特性是由于发射机和接收机相对移动而造成传输路径的变化。这些传播条件的变化速率影响衰落率。如果存在大量反射路径而不存在视行信号分量，此时的小规模衰落称为瑞利衰落(Rayleigh fading)，接收信号的包络由瑞利概率分布函数统计描述。这种衰落也就是这次实验我准备研究的-system for mobile communications fading there are two main categories : large-scale and small-scale fading fading. In view of large-scale decline of large scale movement of the average energy of the signal path to reduce or loss. And the decline of small-scale, it was manifested as two mechanisms : signal delay expansion and channel time-varying characteristics. For wireless applications, channel time-varying characteristics as transmitter and receiver relative movement caused transmission path changes. These conditions spread of the rate changes affect the rate of decline. If there is a large number of pathways exist without depending on the signaling component, At that time, the decline of small-scale known as Rayleigh fading (Rayleigh fading). The received signal envelope from Rayleigh
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Author: 赵景 |
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Description: 本文主要研究了W-WAN中GPRS网络的移动视频传输问题。文中探讨了GPRS的网络结构、协议体系以及链路特性，从中我们看出：
GPRS网络链路不仅具有一般无线链路数据传输中遇到的延迟大、误码率高等共性问题，而且具有移动通信系统采用蜂窝频率复用方式带来的小区切换，
以及由于通信中链路性能随着地理位置变换而变化造成的GPRS网络中不可避免的经常性遭遇的冗长时延和突变时延。
这使得目前GPRS网络中使用的传统TCP或UDP传输协议均不能适应GPRS自身的链路特性，也不能实现高效的分组传输。-This paper mainly studied the W-WAN in the GPRS network for mobile video transmission problems. The article discusses the GPRS network architecture, protocol architecture, as well as link characteristics, from which we can see: GPRS network link not only has the general wireless link data transmission delay encountered in large, common problems of higher bit error rate, and with mobile communications system uses a cellular frequency reuse methods brought about by cell switching, as well as the communication link performance with the location change and change is inevitable GPRS network, the recurrent encountered lengthy delay and delay mutation. This makes the current GPRS network using the traditional TCP or UDP transport protocol are unable to adapt its own GPRS link characteristics, but also efficient packet transmission can not be achieved.
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Size: 3594240 |
Author: QHLee |
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Description: CDMA移动通信系统中一种速率功率联合控制方法-CDMA mobile communication system in a joint rate-power control method
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Size: 125952 |
Author: 胡灿 |
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Description: 一个掌上电脑PPC用的汇率转换软件，简单易用。
用于windows mobile2003或者2002以上。-A Pocket PC PPC with exchange rate conversion software, easy to use. For windows mobile2003 or more than 2002.
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Size: 38912 |
Author: DA |
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Description: 这是一个测试手机关键信息的jar包，比如手机的按键值，内存大小，屏幕大小，刷新频率，支持文件类型等-This is a test mobile phone jar package key information, such as cell phone button value, memory size, screen size, refresh rate and support the file type, etc.
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Size: 6144 |
Author: wuwenguang |
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Description: 这是基于PIC系列单片机的C语言编程，采用阈值法检测QRS波，并且将检测到的QRS波经过高低通滤波、微分、移动窗口积分后，通过检测两个相邻的峰值，计算出心率-This is based on the PIC series MCU C language programming, using the threshold detection QRS wave, and the QRS wave is detected after a low pass filter, differential, mobile window points to the public through the detection of two adjacent peaks, calculate the heart rate
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Size: 5120 |
Author: 李培 |
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Description: 垃圾邮件过滤器
本软件基于朴素贝叶斯算法，用NetBean生成的界面（须JDK1.6），适用于对手机短信，邮箱邮件，日记等一些txt文件进行分类，测试率达90 以上。-Spam filter software is based on the Naive Bayes algorithm, using NetBeans generated interface [have to JDK1.6], suitable for mobile phone message, mail messages, diaries and other documents classified txt, testing rate of 90 .
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Size: 971776 |
Author: 梦创 |
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Description: calculator for calculating interest rate in a mobile phone
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Size: 5120 |
Author: CHAN LEUNG PAN |
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Description: these scripts explains wired wireless scenarios and generating the xgraphs for bitrate delay and loss rate. the scenario is a small topology with 8 mobile nodes
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Size: 6144 |
Author: shiva |
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Description: 视频车辆牌照识别，包含汉字处理算法，BP神经网络设计。识别率高达90％以上。-Video vehicle license plate recognition, including the Chinese characters processing algorithms, BP neural network design. Recognition rate as high as 90 .
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Size: 771072 |
Author: 飞辉 |
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Description: Single Data Rate Mobile SDRAM Controller Core
with AHB Interface
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Size: 733184 |
Author: gosha |
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Description: 基于Windows Mobile 5.0平台的PDA蓝牙应用软件，可以配置传输速率，可将蓝牙接收到的数据绘制实时曲线-Windows Mobile 5.0-based PDA platform Bluetooth application software, you can configure the transmission rate, Bluetooth can be drawn to receive real-time data curve
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Size: 120832 |
Author: 王国华 |
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Description: 2. 关于无线信道的多普勒谱，请回答以下问题：
(1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请描述产生混叠的各种原因；
(2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理；
(3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请回答：证明自己用计算机产生的经典谱是正确的可能方法。
-On the wireless channel of the Doppler spectrum, please answer the following questions: (1) In some radio channels, the Doppler frequency shift will cause the output signal of the wireless channel aliasing. Please describe the aliasing produced a variety of reasons (2) wireless channel in the Doppler spectrum has a classical spectrum (classic spectrum), please explain the mechanism of produce such spectral shape (3), please use the Simulink tool to write code ( S-Function mode), resulting in a single-path Rayleigh channel, the Doppler spectrum for the classical spectrum, including mobile rate of 120km/h. And requested the answer: that they used computer-generated classical spectrum is the right possible way.
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Size: 31744 |
Author: Helen |
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Description: 系统介绍
从手机游戏依托的技术平台来看，目前Java手机游戏保持很高的增长速度。手机游戏将是未来游戏市场的主要发展方向，只要拥有一部手机，就可以进入到全新的掌上游戏世界。游戏正成为无线增值服务的主力军，各游戏开发商早已洞察到这一点，通信公司2.5G和3G通信技术的发展，给手机用户带来了高达每秒384K的移动带宽，将语音、图像、视频有序地结合起来，给手机用户带来了更加丰富多彩的多媒体娱乐服务，借此东风，各游戏开发商将进入全新的无线网络游戏时代。市场潜力巨大。
手机版象棋游戏采用MIDP1.0开发，在低端手机上运行的同时，保证了高端手机的兼容性，其市场发展空间巨大。伴随着中国移动GPRS和中国联通CDMA1X数据业务的开展，手机游戏将是3G数据业务的一个重要的应用领域。
根据需求分析的描述以及与用户的沟通，现制定系统实现目标如下：
界面设计简洁、友好、美观大方，保证直接上手便可游戏
操作简单、快捷方便
规则简单，方便游戏者进行游戏
实现智能规则判断
支持大型Web服务器，以Http协议通讯。
向PC端开发靠拢，为以后PC与手机互联奠定基础-System Introduction
From the mobile game based on the technology platform, the existing Java mobile phone games to maintain a high growth rate. Games will be the future direction of the major gaming market, as long as a mobile phone, you can enter into a new handheld gaming world. Games are becoming the main force in the wireless value-added services, the game developers already had an insight into this, 2.5G and 3G communications companies in the development of communication technologies, to mobile users moving up to 384K per second bandwidth, voice, image, order to combine video, to mobile phone users a richer multimedia entertainment services, to the east wind, the game developers will enter a new era of wireless network game. Great market potential.
Mobile chess game development using MIDP1.0, runs in the low-end phones, while ensuring the compatibility of high-end phones, its market is huge. With China Mobile and China Unicom CDMA1X GPRS data business, the mobile game will be
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Size: 122880 |
Author: 午饭 |
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Description: 设计一完整的移动通信系统物理层传输方案
(WiMAX场景)：
试设计一完整的移动通信系统物理层传输方案并用MATLAB程序实现，要求满足以下指标：
1. 数据速率：5km/hr的移动速度下可实现60Mbps，同时在120km/hr的移动速度下可实现10Mbps，且Eb/No小于20dB时可实现误比特率Pe <= 10-4
2. 信号带宽为20MHz，工作在2GHz频带
3. 信道模型: COST207模型的6径瑞利信道(可参考程序 multipath_code.zip)
请给出以下结果：
A．收发机结构框图，主要参数设定；
B．
误比特率仿真曲线。(考虑非理想同步和信道估计)；-Design a complete system for mobile communications physical layer transmission scheme (WiMAX scene): try to design a complete system for mobile communications and physical layer transmission scheme to achieve with the MATLAB program, requires the following indicators: 1. Data rate: 5km/hr mobile speed can achieve 60Mbps, while the movement in the 120km/hr speed can achieve 10Mbps, and Eb/No less than 20dB can be achieved when the bit error rate Pe < = 10-4 2. signal bandwidth of 20MHz, the work in the 2GHz band 3. channel Model: COST207 model 6 path Rayleigh channel (refer to program multipath_code.zip) Please give the following results: A. Transceiver block diagram, the main parameter settings B. BER simulation curves. (Taking into account non-ideal synchronization and channel estimation)
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Size: 5120 |
Author: wangjiayin |
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Description: Revised and enlarged version that discusses how to design a mobile communications system. Comprehensively examines the mobile radio environment. Covers prediction of propagation loss, calculation and methods of reducing fades, interference, frequency plans and associated schemes, design parameters, signaling and channel access, cellular CDMA, microcell systems, and miscellaneous related systems. Contains chapter-by-chapter references and problems. Common terms and phrases:bit-error rate CDMA cell site co-channel interference coherence bandwidth diversity scheme FDMA microcell mobile unit path loss Rayleigh fading
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Size: 4662272 |
Author: shahram |
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Description: MATLAB Source Code
<Aided Navigation: GPS with High Rate Sensors> is a design-oriented textbook and guide to building aided navigation systems for smart cars, precision farming vehicles, smart weapons, unmanned aircraft, mobile robots, and other advanced applications. The navigation guide contains two parts explaining the essential theory, concepts, and tools, as well as the methodology in aided navigation case studies with sufficient detail to serve as the basis for application-oriented analysis and design.
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Size: 7578624 |
Author: josiah |
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Description: 计算协方差提供了便利，特别是考虑了半衰期；同时提供了一些其他常用的计算工具，例如decayma ewma等移动平滑计算；(It is convenient to calculate covariance, especially considering half-life. Some other common computing tools, such as decayma ewma and other mobile smoothing calculations, are also provided.)
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Size: 1024 |
Author: jerrywang_123
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Description: 多对中继场景下移动用户的和速率仿真和分析(Sum rate simulation of mobile users in multiple relay scenarios)
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Size: 13312 |
Author: 风中渔夫
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Description: 基于stbc的bpsk四发双收模拟程序,可以用于测试误比特率(Stbc-based Bpsk4-send dual-receive analog program, which can be used to test bit error rate (BER))
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Size: 7168 |
Author: AUMZ%21297118 |
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