用NS- 2 仿真各種路由協(xié)議性能時(shí)用到的傳統(tǒng)運(yùn)動(dòng)場(chǎng)景發(fā)生器存在兩個(gè)缺陷: 運(yùn)動(dòng)狀態(tài)不能迅速過(guò)渡到穩(wěn)態(tài), 節(jié)點(diǎn)速度的 均勻分布區(qū)間起始值只能為0。為了彌補(bǔ)上述缺陷, Tracy Camp 研制了穩(wěn)態(tài)運(yùn)動(dòng)場(chǎng)景發(fā)生器。通過(guò)仿真驗(yàn)證了采用該發(fā)生器可大 大縮短仿真時(shí)間, 在此基礎(chǔ)上仿真AODV 和DSDV 兩種路由協(xié)議, 首次從吞吐量、協(xié)議包開(kāi)銷、平均延遲三個(gè)方面對(duì)穩(wěn)態(tài)運(yùn)動(dòng)場(chǎng)景 下的兩種路由協(xié)議性能進(jìn)行分析, 得出結(jié)論表明采用穩(wěn)態(tài)運(yùn)動(dòng)場(chǎng)景進(jìn)行路由協(xié)議仿真是非常必要的。 關(guān)鍵詞: 穩(wěn)態(tài)運(yùn)動(dòng)場(chǎng)景 setdest 更新過(guò)程 Random Waypoint
標(biāo)簽： Tracy Camp 缺陷 穩(wěn)態(tài)
上傳時(shí)間： 2014-12-05
上傳用戶：busterman
A MATLAB program has been written to investigate Orthogonal Frequency Division Multiplexing (OFDM) communication systems. This program is valuable for future researchers simulating systems that are too theoretically complex to analyze. Single-carrier QAM and multicarrier OFDM are compared to demonstrate the strength of OFDM in multipath channels. Two graphical user interface demonstrations show some of the basic concepts of OFDM.
標(biāo)簽： Multiplexing investigate Orthogonal Frequency
上傳時(shí)間： 2013-12-09
上傳用戶：redmoons
3gpp信道模型代碼，加入mimo，多徑等-3GPP channel model code, adding mimo, multipath, etc.
標(biāo)簽： 移動(dòng)通信 多普勒頻移
上傳時(shí)間： 2015-06-16
上傳用戶：whtiger
The new digital radio system DAB (Digital Audio Broadcasting, nowadays often called Digital Radio) is a very innovative and universal multimedia broadcast system which will replace the existing AM and FM audio broadcast services in many parts of the world in the future. It was developed in the 1990s by the Eureka 147/DAB project. DAB is very well suited for mobile reception and provides very high robustness against multipath reception. It allows use of single frequency networks (SFNs) for high frequency efficiency.
標(biāo)簽： Broadcasting Principles Digital Audio
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
Many wireless communications channels consist of multiple signal paths from the transmitter to receiver. This multiplicity of paths leads to a phenomenon known as multipath fading. The multiple paths are caused by the presence of objects in the physical environment that, through the mechanisms of propagation, alter the path of radiated energy. These objects are referred to as scatterers. In the past, researchers often looked at ways to mitigate multipath scattering, such as in diversity systems. Multiple-input, multiple-output (MIMO) systems, on the other hand, use multipath diversity to their advantage; a MIMO system has the ability to translate increased spatial diversity into increased channel capacity.
標(biāo)簽： Multiple-Output Multiple-Input Channel Models
上傳時(shí)間： 2020-05-31
上傳用戶：shancjb
Orthogonal frequency division multiplexing (OFDM) has been shown to be an effective technique to combat multipath fading in wireless channels. It has been and is going to be used in various wireless communication systems. This book gives a comprehensive introduction on the theory and practice of OFDM for wireless communications.
標(biāo)簽： Multiplexing Orthogonal Frequency Division
上傳時(shí)間： 2020-05-31
上傳用戶：shancjb
Radio propagation measurements and channel modelling continue to be of fundamental importance to radio system design. As new technology enables dynamic spectrum access and higher data rates, radio propagation effects such as shadowing, the presence of multipath and frequency dispersion are the limiting factors in the design of wireless communication systems. While there are several books covering the topic of radio propagation in various frequency bands, there appears to be no books on radio propagation measurements, which this book addresses at length.
標(biāo)簽： Propagation Measurement Radio
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
Wireless communications has become a field of enormous scientific and economic interest. Recent success stories include 2G and 3G cellular voice and data services (e.g., GSM and UMTS), wireless local area networks (WiFi/IEEE 802.11x), wireless broadband access (WiMAX/IEEE 802.16x), and digital broadcast systems (DVB, DAB, DRM). On the physical layer side, traditional designs typically assume that the radio channel remains constant for the duration of a data block. However, researchers and system designers are increasingly shifting their attention to channels that may vary within a block. In addition to time dispersion caused by multipath propagation, these rapidly time-varying channels feature frequency dispersion resulting from the Doppler effect. They are, thus, often referred to as being “doubly dispersive.”
標(biāo)簽： Time-Varying Channels
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
VIP專區(qū)-嵌入式/單片機(jī)編程源碼精選合集系列（135）資源包含以下內(nèi)容：1. AT89C52紅外接收c源碼 已經(jīng)過(guò)調(diào)試 下載即可使用.2. 步進(jìn)電機(jī)驅(qū)動(dòng)控制技術(shù)及其應(yīng)用設(shè)計(jì)研究 一編論文.3. Nucleus PLUS source code anasisy. An open source OS which is widely used in embedded development dom.4. 數(shù)字系統(tǒng)CAD 開(kāi)發(fā)平臺(tái)實(shí)驗(yàn)部分共有6 個(gè)實(shí)驗(yàn).5. 12位ads7816的兩種讀取方式：SPI方式和手動(dòng)方式.6. 可用于嵌入式編程學(xué)習(xí).7. ADE7755應(yīng)用于單相CPU卡表的硬件設(shè)計(jì)原理圖.8. 電能表的結(jié)構(gòu)原理介紹和工作原理介紹.9. 這是一個(gè)關(guān)于C＋＋編程規(guī)范的資料.10. C／C++bianchengguifan.11. 賽車程序：先對(duì)賽道和賽車建立模型.12. This document teach how you interface the microcontroller to the devices using i2c , spi and serial.13. 我收集的一些I2C的技術(shù)文檔和在linux環(huán)境的應(yīng)用分析等.14. 模糊PID在電阻爐溫度控制系統(tǒng)中的應(yīng)用。提出了FUZZY-PID控制器.15. 在網(wǎng)站上找到的一個(gè)比較不錯(cuò)的字符疊加程序.16. 包的運(yùn)用.17. 嵌入式高速數(shù)據(jù)采集器的研制.18. 嵌入式C_C++語(yǔ)言精華文章集錦.19. Visual C++網(wǎng)絡(luò)通信協(xié)議分析與應(yīng)用實(shí)現(xiàn)代碼.20. 嵌入式C編程語(yǔ)言入門與深入.21. 周立功的PCI51XX CAN卡在VC6.0下的開(kāi)發(fā)示例.22. 飛思卡爾S12系Serial_Peripheral_Interphase_(SPI)應(yīng)用范例.23. 飛思卡爾S12系列Inter-IC_Bus__(IIC)應(yīng)用范例.24. 開(kāi)機(jī)時(shí).25. 簡(jiǎn)單的程序.26. U2270B組成的讀卡頭原理圖!典型應(yīng)用電路.27. lpc214x的開(kāi)發(fā)平臺(tái)下載軟件 使用lpc214x的開(kāi)發(fā).28. ZIGBEE1015無(wú)線傳感器統(tǒng)會(huì)自動(dòng)刪除debug和release目錄.29. Introduction: 1. Macro1: AddFailureModeCol is used to the test report generated from GNPO Rpt Tools.30. 適合用于嵌入式的zc301攝像頭驅(qū)動(dòng)。解壓縮之后放在/driver/media/video/zc0301目錄下.31. 開(kāi)源嵌入式圖形軟件FLTK使用 視頻教程.32. jz4740 nand boot source code. jz4740 nand 引導(dǎo)代碼.33. 用C++寫的一個(gè)模擬ATM自動(dòng)取款機(jī)的程序.我這個(gè)程序不同于網(wǎng)上現(xiàn)有的那個(gè)不能記錄用戶填寫信息的..34. 該電子日歷可顯示年、月、日、星期、時(shí)、分的時(shí)間信息。 整個(gè)系統(tǒng)采用AT89C52作為中央處理芯片.35. 讓你了解AODV在OPNET下怎么運(yùn)用.36. 基于GPS定位的嵌入式汽車監(jiān)控器設(shè)計(jì).37. 使用手冊(cè).38. Zigbee培訓(xùn)資料.39. EASYARM2210的原理圖 設(shè)計(jì)ARM硬件的重要參考.40. 嵌入式平臺(tái)的開(kāi)發(fā)全過(guò)程 非常易懂 嵌?朧狡教ǖ目⑷?非常易懂.
標(biāo)簽： 夜視
上傳時(shí)間： 2013-05-25
上傳用戶：eeworm
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