提高衛(wèi)星通信信道傳輸效率的新途徑本 文 結(jié) 合 V SAT衛(wèi)星通信系統(tǒng)設(shè)計(jì)中涉及衛(wèi)星通信傳輸技術(shù)極為重要的 信道編碼與調(diào)制解調(diào)方式，探討了各種新型的衛(wèi)星信道編碼與調(diào)制解調(diào)技術(shù)， 它們的原理及在衛(wèi)星通信中的應(yīng)用。在數(shù)字調(diào)制中，信號傳輸質(zhì)量主要取決于 比特差錯(cuò)率BER (BIt Error Rate)，因此要盡可能采用相同的每比特信號能量與 噪聲功率譜密度比(Eb/N.)的條件下，BER低的調(diào)制方式，以節(jié)省衛(wèi)星功率 另外頻帶利用率要盡可能的高，以節(jié)省寶貴的衛(wèi)星頻帶。本文還對各種不同的 差錯(cuò)編碼與調(diào)制技術(shù)進(jìn)行了實(shí)驗(yàn)和詳細(xì)的性能比較。
標(biāo)簽： 衛(wèi)星通信 SAT 信道傳輸 傳輸技術(shù)
上傳時(shí)間： 2015-09-16
上傳用戶：AbuGe
一個(gè)簡單的ＳＰＩ ＩＰ核，SPI Core Specifications 可以從說明文檔中找到！ The simple Serial Peripheral Interface core is an enhanced version of the Serial Peripheral Interface found on Motorola s M68HC11 family of CPUs. The Serial Peripheral Interface is a serial, synchronous communication protocol that requires a minimum of 3 wires. FEATURES: · Compatible with Motorola’s SPI specifications · Enhanced M68HC11 Serial Peripheral Interface · 4 entries deep read FIFO · 4 entries deep write FIFO · Interrupt generation after 1, 2, 3, or 4 transferred bytes · 8 BIt WISHBONE RevB.3 Classic interface · Operates from a wide range of input clock frequencies · Static synchronous design · Fully synthesizable
標(biāo)簽：
上傳時(shí)間： 2015-09-17
上傳用戶：TRIFCT
This document describes the uIP TCP/IP stack. The uIP TCP/IP stack is an extremely small implementation of the TCP/IP protocol suite intended for embedded systems running low-end 8 or 16-BIt microcon-trollers. The code size and RAM requirements of uIP is an order of magnitude smaller than other generic TCP/IP stacks today.
標(biāo)簽： stack implementat TCP describes
上傳時(shí)間： 2015-09-18
上傳用戶：zsjinju
This m-file simulates MPSK (theoretical and simulated) with Gray coding This m-file simulates MPSK (BPSK,QPSK,8PSK)with theoretical and simulated results using Gray coding. Numerical examples of a satellite link design are shown using QPSK and/or 8PSK when the BIt rate(Rb)is greater than the channel bandwidth Wc (Band-limited channel).
標(biāo)簽： simulates m-file This MPSK
上傳時(shí)間： 2014-01-11
上傳用戶：372825274
The MATLAB coding style, project options and synthesis directives can have a significant effect on the final results. Knowledge about how a particular algorithm should be implemented in hardware can be reflected in the MATLAB code to improve the results. In doing so, the MATLAB loses a BIt of its abstraction but the lower-level MATLAB will infer the desired architecture into the device.
標(biāo)簽： significant directives synthesis project
上傳時(shí)間： 2013-12-03
上傳用戶：13517191407
CCS編程環(huán)境 使用的是匯編加C的混合編程方法： The programme of the Correlation Algorithm. Using INT2 to get the input signal. Array x, in first step, is the input signal produced by programme, in next step, is the input signal get from A/D, the length is 128, 32-BIt floating point. Array y, in first step, is the input signal produced by programme, in next step, is the input signal get from A/D, the length is 128, 32-BIt floating point. Array cor is the Correlation result, the length is 255, 32-BIt floating point.
標(biāo)簽： Correlation Algorithm programme the
上傳時(shí)間： 2013-12-21
上傳用戶：leixinzhuo
Writing Your First ASP Application ( Quick Start ) (Page 1 of 8 ) There are many tutorials out there that show you how to program in ASP. Some of them are good, and some are bad. Some of them are downright terrible. In any case, you ve read a BIt about ASP and now you are ready to build your first application. But where do you start? In my own experience, I have found that I find it easier to learn something if I actually work with it hands-on. Just reading a book or documentation doesn’t give you the practical knowledge you need to be able to rush off and start creating applications. In this article, I will discuss the creation of a very simple application. I will cover what the application will do, how we will approach writing it, demonstrate in code how we will do it, and discuss additional features that could be added to it. Writing Your First ASP Application ( Quick Start ) - Users On Your Website
標(biāo)簽： Application tutorials Writing First
上傳時(shí)間： 2015-11-05
上傳用戶：franktu
源碼開放的加密軟件。最新版本！！可以在一個(gè)文件內(nèi)部創(chuàng)建多樣化的加密磁盤并且將其配置為一個(gè)可以通過一個(gè)驅(qū)動(dòng)器盤符訪問的虛擬磁盤.任何存儲在該虛擬磁盤上的文件可以被自動(dòng)地實(shí)時(shí)加密,并且只有當(dāng)使用正確的密碼或者密匙配置時(shí)才可以訪問. TrueCrypt 支持多樣化的加密算法,包括 AES-256, Blowfish (448-BIt key), CAST5, Serpent, Triple DES 和 Twofish.其它的功能包括 FAT32 或者 NTFS 格式的支持,隱藏卷。
上傳時(shí)間： 2015-11-08
上傳用戶：dancnc
UCOS/II for ICCAVR - The version of UCOS/II is 2.04 - the original port was done by Ole Saether for the IAR compiler. Jens E. Holtegaard ported one version using ICCAVR. Joerg Meyer did another port (using Jens port as a start?). This is basically Joerg s port plus a little BIt of changes and documentation by me. - YOU MUST DOWNLOAD THE MAIN PART OF THE UCOS/II FROM THE UCOS/II WEBSITE http://www.ucos-ii.com . The supplied project file assumes the portable source is in the ..\source directory. - Joerg has written couple document showing the stack frames etc. but it is in German :-) They are included in this directory. - The Timer2 overflow interrupt is used for Timer Tick. If you want to change that, modify os_cpu_c.c and os_cpu_a.s - I have tested this using ATMega103 with and without external RAM using AVR Studio simulator. See test1.c test program. Both Code Compressed (PRO) and STD versions have been tested.
標(biāo)簽： UCOS original Saether version
上傳時(shí)間： 2015-11-14
上傳用戶：ippler8
The ability to write efficient, high-speed arithmetic routines ultimately depends upon your knowledge of the elements of arithmetic as they exist on a computer. That conclusion and this book are the result of a long and frustrating search for information on writing arithmetic routines for real-time embedded systems. With instruction cycle times coming down and clock rates going up, it would seem that speed is not a problem in writing fast routines. In addition, math coprocessors are becoming more popular and less expensive than ever before and are readily available. These factors make arithmetic easier and faster to use and implement. However, for many of you the systems that you are working on do not include the latest chips or the faster processors. Some of the most widely used microcontrollers used today are not Digital Signal Processors (DSP), but simple eight-BIt controllers such as the Intel 8051 or 8048 microprocessors.
標(biāo)簽： arithmetic high-speed ultimately efficient
上傳時(shí)間： 2014-11-30
上傳用戶：lizhen9880
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