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.
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.
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.
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.
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.
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.”
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. 步進電機驅動控制技術及其應用設計研究
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. 電能表的結構原理介紹和工作原理介紹.9. 這是一個關于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.
