1928年,Wilhelm Ackermann (1896 - 1962,David Hilbert的學生) 發現x的y次冪的z-重積分 A(x,y,z)是遞歸的但不是原始遞歸的。Rosza Peter將A(x,y,z)簡化到二元函數,初始條件由Raphael Robinson簡化。
標簽: 1928
上傳時間: 2013-12-10
上傳用戶:xfbs821
基于OFDM的無線寬帶系統仿真It contains mainly two parts, i.e. link-level simulator and system-level simulator. Link-level simulator focus on a single-cell single-user scenario, where signal is transmitted from tx, and estimated at rx. Comparing the difference in tx/rx signal, the error rate can be found out. The output of the link-level simulator is the BLER/BER vs. SNR mapping table, that can be used for the system-level simulation. System-level simulator focus on a multi-cell multi-user scenario. For the sake of simplicity, it takes the mapping table aquired in the link-level simulation, measure the actural SNR, and finds the corresponding error rate.
標簽: simulator i.e. system-level link-level
上傳時間: 2016-03-15
上傳用戶:xsnjzljj
This project aim was to build wireless software modem for data communication between two computers using an acoustic interface in the voice frequency range (20Hz– 20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz – 20,000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz – 16,000Hz). The test files used as information files were text files. This goal was attained both in an incoherent scheme and in a coherent scheme. Build under Matlab code, our modem uses OFDM (orthogonal frequency division multiplexing) modulation, synchronization by LMS sequence, channel estimation (no equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of 2 or 4. To optimize the probability of error, these symbols were mapped using Gray mapping. Report
標簽: communication computers software wireless
上傳時間: 2014-05-29
上傳用戶:wangdean1101
METAmorphoses is a system for flexible and easy-to-use generation of RDF metadata directly from a relational database. Metadata are genereated according to a mapping from an existing database schema to a particular ontology.
標簽: METAmorphoses easy-to-use generation flexible
上傳時間: 2014-01-03
上傳用戶:nanxia
該程序的功能是從緩沖區中讀取鍵入字符并顯示在屏幕上,當按下left_shift鍵(掃描碼為42d)的同時,又按下0-9或a-z等鍵,則顯示鍵的上檔符號或大寫字母。按動除left_shift鍵以外的控制鍵或功能鍵時,則退出。
上傳時間: 2014-11-22
上傳用戶:1159797854
編寫簡單的加密程序它把一個文件的所有字母按下列規律進行 換,非字母的字符保持不變。文本可以自行創建,文件名可以自定 轉換規律:‘A’→‘Z’,‘B’→‘Y’,• •
上傳時間: 2016-03-23
上傳用戶:ouyangtongze
詳細介紹了matlab中的常用命令集,按照從a到z的順序排列。
上傳時間: 2013-12-17
上傳用戶:gaome
This demonstration shows how a ZigBee coordinator can be set up. This demo allows the Demonstration Board (PICDEM Z or Explorer 16) to act as either a "Switching Load Controller" (e.g. a light) or a "Switching Remote Control" (e.g. a switch) as defined by the Home Controls, Lighting profile. It is designed to interact with a second Demonstration board programmed with the Demo RFD project
標簽: This demonstration Demonstratio coordinator
上傳時間: 2014-01-18
上傳用戶:dianxin61
實驗目的 1.培養學生綜合掌握軟件開發過程的能力。 2.培養學生綜合運用面向對象設計方法的能力,包括: ? 用例分析; ? CRC卡; ? UML圖; ? 文檔制作 3.掌握常用軟件分析、設計工具的使用方法 實驗內容 完成“快速拼寫檢查程序”的分析、設計和實現過程。 快速拼寫檢查程序基本要求說明如下: 1.進行拼寫檢查的文件以文本文件形式存儲于外存上; 2.只檢查文件中英文單詞的拼寫錯誤; 3.單詞是用字母(a…z或A…Z)定義,任一非字母字符作為分隔符; 4.判斷單詞拼寫正誤的依據是詞典,詞典以文本文件形式存放于外存上; 5.詞典文件第1行為詞典的名稱,以后每一行存放一個單詞; 6.輸出結果以文本文件形式存儲,其格式為: 第1行:被拼寫檢查的文件名 + 詞典名 第2行后的每一行: 出錯單詞 位于第x行 7.設計一個合理的GUI,注意GUI界面類與功能類的關系應比較松散。
上傳時間: 2016-04-05
上傳用戶:123啊
復指數法是根據結構的自由振動響應或脈沖響應函數可以表示為復指數函數和的形式,然后用線性方法來確定未知參數。其主要思想是從振動微分方程的振型疊加法原理出發,建立動力響應與模態參數之間的關系表達式,通過對脈沖響應函數進行擬合可以得到完全的模態參數,獲得了良好的擬合效果。基本方法是以Z變換因子中包含待識別的頻率,構造Prony多項式,使其零點等于Z變換因子的值。這樣,將求解Z變換因子轉化為求解Prony多項式的系數。這里給出用矩陣解Prony多項式的系數的MATLAB程序。
上傳時間: 2016-04-06
上傳用戶:aysyzxzm