The fi rst edition of this book came about because Regina Lundgren had always been fascinated with COMMUNICATION. She started writing novels in the third grade. When she was asked on her fi rst day at the University of Washington what she hoped to do with her degree in scientifi c and technical COMMUNICATION, she replied, “I want to write environ- mental impact statements.” When Patricia Clark hired her to work at the Pacifi c Northwest National Laboratory to do just that, she was overjoyed.
標簽： COMMUNICATION RISK
上傳時間： 2020-06-01
上傳用戶：shancjb
Since the first edition of the book was published, the field of modeling and simulation of COMMUNICATION systems has grown and matured in many ways, and the use of simulation as a day-to-day tool is now even more common practice. Many new modeling and simulation approaches have been developed in the recent years, many more commercial simulation packages are available, and the evolution of powerful general mathematical applications packages has provided still more options for computer-aided design and analysis. With the current interest in digital mobile COMMUNICATIONs, a primary area of application of modeling and simulation is now to wireless systems of a different flavor than the traditional ones.
標簽： COMMUNICATION Simulation Systems of
上傳時間： 2020-06-01
上傳用戶：shancjb
The goal of this book is to provide a concise but lucid explanation and deriva- tion of the fundamentals of spread-spectrum COMMUNICATION systems. Although spread-spectrum COMMUNICATION is a staple topic in textbooks on digital com- munication, its treatment is usually cursory, and the subject warrants a more intensive exposition. Originally adopted in military networks as a means of ensuring secure COMMUNICATION when confronted with the threats of jamming and interception, spread-spectrum systems are now the core of commercial ap- plications such as mobile cellular and satellite COMMUNICATION.
標簽： Spread-Spectrum COMMUNICATION Systems 1st
上傳時間： 2020-06-01
上傳用戶：shancjb
Spread-spectrum COMMUNICATION is a core area within the field of digital COMMUNICATION. Originally used in military networks as countermeasures against the threats of jamming and interception, spread-spectrum systems are now widely used in commercial applications and are part of several wireless and mobile COMMUNICATION standards. Although spread-spectrum COMMUNICATION is a staple topic in textbooks on digital COMMUNICATION, its treatment is usually cursory. This book is designed to provide a more intensive examination of the subject that is suitable for graduate students and practicing engineers with a solid background in the theory of digital COMMUNICATION. As the title indicates, this book stresses principles rather than specific current or planned systems, which are described in manyotherbooks.My goal in this bookis to providea concisebut lucidexplanation of the fundamentals of spread-spectrum systems with an emphasis on theoretical principles.
標簽： Spread-Spectrum COMMUNICATION Systems 2nd
上傳時間： 2020-06-01
上傳用戶：shancjb
The continuing vitality of spread-spectrum COMMUNICATION systems and the devel- opment of new mathematical methods for their analysis provided the motivation to undertake this new edition of the book. This edition is intended to enable readers to understand the current state-of-the-art in this field. Almost twenty percent of the materialinthiseditionisnew, includingseveralnewsections, anewchapteronadap- tive arrays and filters, and a new chapter on code-division multiple-access networks. The remainder of the material has been thoroughly revised, and I have removed a considerable amount of material that has been superseded by more definitive results.
標簽： Spread-Spectrum COMMUNICATION Systems 3rd
上傳時間： 2020-06-01
上傳用戶：shancjb
Visible light COMMUNICATIONs (VLC) is the name given to an optical wireless COMMUNICATION system that carries information by modulating light in the visible spectrum (400–700 nm) that is principally used for illumination [1–3]. The COMMUNICATIONs signal is encoded on top of the illumination light. Interest in VLC has grown rapidly with the growth of high power light emitting diodes (LEDs) in the visible spectrum. The motivation to use the illumination light for COMMUNICATION is to save energy by exploiting the illumination to carry information and, at the same time, to use technology that is “green” in comparison to radio frequency (RF) technology, while using the existing infrastructure of the lighting system.
標簽： COMMUNICATION Visible Light
上傳時間： 2020-06-01
上傳用戶：shancjb
This is a book on wireless COMMUNICATION. That usually means communica- tion by radio, though ultrasound and infrared light are also used occasion- ally. The term “wireless” has come to mean nonbroadcast COMMUNICATION, usually between individuals who very often use portable or mobile equip- ment. The term is rather vague, of course, and there are certainly borderline applications that are called wireless without falling exactly into the above definition.
標簽： COMMUNICATION Technology Wireless
上傳時間： 2020-06-01
上傳用戶：shancjb
擴頻通信，即擴展頻譜通信技術(Spread Spectrum COMMUNICATION)，它與光纖通信、衛星通信一同被譽為進入信息時代的三大高技術通信傳輸方式。 擴頻通信是將待傳送的信息數據用偽隨機編碼序列，也即擴頻序列(SpreadSequence)調制，實現頻譜擴展后再進行傳輸。接收端則采用相同的編碼進行解調及相關處理，恢復出原始信息數據。 擴頻通信系統與常規的通信系統相比，具有很強的抗人為干擾，抗窄帶干擾，抗多徑干擾的能力，并具有信息隱蔽、多址保密通信等特點。 現場可編輯門陣列FPGA(Field Programmable Gate Array)提供了極強的靈活性，可讓設計者開發出滿足多種標準的產品。FPGA所固有的靈活性和性能也可讓設計者緊跟新標準的變化，并能提供可行的方法來滿足不斷變化的標準要求。 EDA 工具的出現使用戶在對FPGA設計的輸入、綜合、仿真時非常方便。EDA打破了軟硬件之間最后的屏障，使軟硬件工程師們有了真正的共同語言，使目前一切仍處于計算機輔助設計(CAD)和規劃的電子設計活動產生了實在的設計實體論文對擴頻通信系統和FPGA設計方法進行了相關研究，并且用Altera公司的最新的FPGA開發平臺QuartusII實現了一個基帶擴頻通信系統的發送端部分，最后用軟件Protel99SE設計了相應的硬件電路。 該系統的設計主要分為兩個部分。第一部分是用QuartusII軟件設計了系統的VHDL語言描述代碼，并對系統中每個模塊和整個系統進行相應的功能仿真和時序時延仿真；第二部分是設計了以FPGA芯片EP1C3T144C8N為核心的系統硬件電路，并進行了相關測試，完成了預定的功能。
上傳時間： 2013-07-26
上傳用戶：15679277906
近年來，隨著電子技術的發展，消費電子產品(Consumer Electronics)已與計算機(Computer)、通信(COMMUNICATION)兩項產品的技術結合在一起，成為目前所統稱的3C產品，并使家用電子電器產品步向智能家居的方向。但是目前大多數智能家居系統其控制器一般由8位或16位的單片機控制，其控制功能比較簡單，很難實現網絡化和無線傳輸，對于未來的智能家居系統的擴展性也比較有限。本文針對目前國內智能家居系統的局限性，提出一種基于嵌入式處理器ARM平臺以及以太網和GPRS網絡通信技術的智能家居系統，它不僅能對小區內住宅的安全狀況進行實時監控，還能實現家用電器的遠程控制、“三表”(即水表、電表、燃氣表)的遠程抄送。同時該系統還提供了規范的串行通信接口，對于未來的系統的擴展提供了廣闊的空間。 本文首先詳細的介紹了ARM處理器及嵌入式操作系統uClinux的發展概況，接著討論了GPRS網絡通信技術的工作原理，最后給出了智能家居控制系統的硬件設計和軟件設計。該智能家居系統的硬件主要包括ARM主控模塊的選型、報警I/O電路設計、以太網接口電路設計、圖像處理模塊電路和“三表”的串行口電路組成。軟件上主要包括uClinux在S3C4510上的移植、圖像采集與壓縮程序、以太網驅動及通訊程序、RS-485串行接口程序、GPRS網絡通信程序和報警I/O接口程序。 該系統主要部分包括小區內住宅的安防監控，GPRS無線智能家電的遠程控制和無線報警以及抄表的遠程傳送。利用當前較為成熟的GPRS技術和以太網實現對小區內用戶進行集中安防監控與管理，同時給出了系統的功能和結構以及硬件原理框圖和軟件設計思路及主要程序。
上傳時間： 2013-07-12
上傳用戶：haobin315
Phase–locked loop (PLL) frequency synthesizers are commonlyfound in COMMUNICATION gear today. Th
上傳時間： 2013-04-24
上傳用戶：yxgi5
