用NS- 2 仿真各種路由協(xié)議性能時用到的傳統(tǒng)運動場景發(fā)生器存在兩個缺陷: 運動狀態(tài)不能迅速過渡到穩(wěn)態(tài), 節(jié)點速度的 均勻分布區(qū)間起始值只能為0。為了彌補上述缺陷, Tracy Camp 研制了穩(wěn)態(tài)運動場景發(fā)生器。通過仿真驗證了采用該發(fā)生器可大 大縮短仿真時間, 在此基礎上仿真AODV 和DSDV 兩種路由協(xié)議, 首次從吞吐量、協(xié)議包開銷、平均延遲三個方面對穩(wěn)態(tài)運動場景 下的兩種路由協(xié)議性能進行分析, 得出結(jié)論表明采用穩(wěn)態(tài)運動場景進行路由協(xié)議仿真是非常必要的。 關(guān)鍵詞: 穩(wěn)態(tài)運動場景 setdest 更新過程 Random Waypoint
標簽： Tracy Camp 缺陷 穩(wěn)態(tài)
上傳時間： 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.
標簽： Multiplexing investigate Orthogonal Frequency
上傳時間： 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.
上傳時間： 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.
標簽： Broadcasting Principles Digital Audio
上傳時間： 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.
標簽： Multiple-Output Multiple-Input Channel Models
上傳時間： 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.
標簽： Multiplexing Orthogonal Frequency Division
上傳時間： 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.
標簽： Propagation Measurement Radio
上傳時間： 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.”
標簽： Time-Varying Channels
上傳時間： 2020-06-01
上傳用戶：shancjb
VIP專區(qū)-嵌入式/單片機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)過調(diào)試 下載即可使用.2. 步進電機驅(qū)動控制技術(shù)及其應用設計研究 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 開發(fā)平臺實驗部分共有6 個實驗.5. 12位ads7816的兩種讀取方式：SPI方式和手動方式.6. 可用于嵌入式編程學習.7. ADE7755應用于單相CPU卡表的硬件設計原理圖.8. 電能表的結(jié)構(gòu)原理介紹和工作原理介紹.9. 這是一個關(guān)于C＋＋編程規(guī)范的資料.10. C／C++bianchengguifan.11. 賽車程序：先對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)境的應用分析等.14. 模糊PID在電阻爐溫度控制系統(tǒng)中的應用。提出了FUZZY-PID控制器.15. 在網(wǎng)站上找到的一個比較不錯的字符疊加程序.16. 包的運用.17. 嵌入式高速數(shù)據(jù)采集器的研制.18. 嵌入式C_C++語言精華文章集錦.19. Visual C++網(wǎng)絡通信協(xié)議分析與應用實現(xiàn)代碼.20. 嵌入式C編程語言入門與深入.21. 周立功的PCI51XX CAN卡在VC6.0下的開發(fā)示例.22. 飛思卡爾S12系Serial_Peripheral_Interphase_(SPI)應用范例.23. 飛思卡爾S12系列Inter-IC_Bus__(IIC)應用范例.24. 開機時.25. 簡單的程序.26. U2270B組成的讀卡頭原理圖!典型應用電路.27. lpc214x的開發(fā)平臺下載軟件 使用lpc214x的開發(fā).28. ZIGBEE1015無線傳感器統(tǒng)會自動刪除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。解壓縮之后放在/driver/media/video/zc0301目錄下.31. 開源嵌入式圖形軟件FLTK使用 視頻教程.32. jz4740 nand boot source code. jz4740 nand 引導代碼.33. 用C++寫的一個模擬ATM自動取款機的程序.我這個程序不同于網(wǎng)上現(xiàn)有的那個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、分的時間信息。 整個系統(tǒng)采用AT89C52作為中央處理芯片.35. 讓你了解AODV在OPNET下怎么運用.36. 基于GPS定位的嵌入式汽車監(jiān)控器設計.37. 使用手冊.38. Zigbee培訓資料.39. EASYARM2210的原理圖 設計ARM硬件的重要參考.40. 嵌入式平臺的開發(fā)全過程 非常易懂 嵌?朧狡教ǖ目⑷?非常易懂.
標簽： 夜視
上傳時間： 2013-05-25
上傳用戶：eeworm
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