壓縮解壓算法LZ77算法有許多派生算法(這里面包括 LZSS算法)。它們的算法原理上基本都相同，無論是哪種派生算法，LZ77算法總會包含一個動態窗口（Sliding Window）和一個預讀緩沖器（Read ahead Buffer）。動態窗口是個歷史緩沖器，它被用來存放輸入流的前n個字節的有關信息。一個動態窗口的數據范圍可以從 0K 到 64K，而LZSS算法使用了一個4K的動態窗口。預讀緩沖器是與動態窗口相對應的，它被用來存放輸入流的前n個字節，預讀緩沖器的大小通常在0 – 258 之間。這個算法就是基于這些建立的。用下n個字節填充預讀緩存器（這里的n是預讀緩存器的大小）。在動態窗口中尋找與預讀緩沖器中的最匹配的數據，如果匹配的數據長度大于最小匹配長度 （通常取決于編碼器，以及動態窗口的大小，比如一個4K的動態窗口，它的最小匹配長度就是2），那么就輸出一對〈長度（length），距離（distance）〉數組。長度(length)是匹配的數據長度，而距離(distance)說明了在輸入流中向后多少字節這個匹配數據可以被找到。
上傳時間： 2014-01-22
上傳用戶：tzl1975
This book explains how to write device drivers for the newest members of the MicrosoftWindows family of operating systems using the Windows Driver Model (WDM). In this Introduction, I ll explain who should be reading this book, the organization of the book, and how to use the book most effectively. You ll also find a note on errors and a section on other resources you can use to learn about driver programming. Looking ahead, Chapter 1 explains how the two main branches of the Windows family operate internally, what a WDM device driver is, and how it relates to the rest of Windows.
標簽： MicrosoftWindows the explains drivers
上傳時間： 2014-01-04
上傳用戶：dongqiangqiang
It’s your first day in the lab.Undoubtedly you are experiencing a range of emotions: excitement, curiosity, anxiety. You will be working in this lab and with a group of people, as well as with your supervisor, for several years to come. This is the first day of a long commitment and, for some, a hard road ahead. Which is why it’s important to get off on the right foot.
標簽： experiencing Undoubtedly excitement emotions
上傳時間： 2017-09-14
上傳用戶：zhangyi99104144
PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
上傳時間： 2022-07-08
上傳用戶：
