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
In this letter, the error performance of an ultra-wideband (UWB) system with a hybrid pulse amplitude and position modulation (PAPM) scheme over indoor lognormal fading channels is analyzed. In the PAPM UWB system, input data is modulated onto both the pulse amplitudes and pulse positions.
標簽： ultra-wideband performance amplitud letter
上傳時間： 2014-01-08
上傳用戶：yulg
1984年出版，成型于美國麻省理工學院(MIT)多年使用的一本教材，1996年修訂為第2版。在過去的二十多年里，本書對于計算機科學的教育計劃產生了深刻的影響。 本版中大部分重要程序設計系統都重新修改并做過測試，包括各種解釋器和編譯器。 目錄 出版者的話 專家指導委員會 序 第2版前言 第1版前言 致謝 第1章 構造過程抽象 1.1 程序設計的基本元素 1.2 過程與它們所產生的計算 1.3 用高階函數做抽象 第2章 構造數據現象 2.1 數據抽象導引 2.2 層次性數據和閉包性質 2.3 符號數據 2.4 抽象數據的多重表示 2.5 帶有通用型操作的系統 第3章 模塊化、對象和狀態 3.1 賦值和局部狀態 3.2 求值的環境模型 3.3 用變動數據做模擬 3.4 并發：時間是一個本質問題 3.5 流 第4章 元語言抽象 4.1 元循環求值器 4.2 scheme的變形——惰性求值 4.3 scheme的變形——非確定性計算 4.4 邏輯程序設計 第5章 寄存器機器里的計算 5.1 寄存器機器的設計 5.2 一個寄存器機器模擬器 5.3 存儲分配和廢料收集 5.4 顯式控制的求值器 5.5 編譯 參考文獻 練習表 索引
標簽： 1984
上傳時間： 2013-11-29
上傳用戶：咔樂塢
無線傳感器網絡的主要功能是實現數據發布,在接收到信息查詢時能夠以有效的方式傳輸給查詢者.目前的數據發布方式通常基于洪泛機制查詢信息,浪費了有限的能源.雖然一些最近的數據發布協議從不同程度上解決了這一問題,但不能保證查詢成功率.基于圓形節點分布網絡模型提出了一種既能減少能源消耗,又能提高成功率的數據發布模式——直徑-弦模式DCS(diameter-chord scheme).該模式利用了每個圓的弦都存在一個直徑與之垂直相交的性質.在此基礎上提出了Two-Phase協議.它在信息查詢時分成兩個工作方式不同的階段進行,在第1段查詢不中時觸發第2段查找.為了減少Two-Phase的延遲,提出了基于優先級和概率轉發兩種解決方法.理論分析和實驗結果都表明,所提出的數據發布協議具有較好的性能.
上傳時間： 2016-04-29
上傳用戶：李夢晗
JAVA 語言的函數式編程擴展，支持Erlang的Actor通信編程，支持類似Lisp或scheme語言的高階函數，支持Continiuation！
上傳時間： 2016-06-07
上傳用戶：thuyenvinh
A framework written in Java for implementing high-level and dynamic languages, compiling them into Java bytecodes. An implementation of scheme, which is in the Lisp family of programming languages. Kawa is a featureful dialect in its own right, and additionally provides very useful integration with Java. It can be used as a “scripting language”, but includes a compiler and all the benefits of a “real” programming language, including optional static typing.
標簽： implementing high-level framework compiling
上傳時間： 2014-01-05
上傳用戶：libinxny
Versatile visual servoing without knowledge of true jacobian.pdf cobian matrix estimator. The Jacobian matrix estimator does not need a priori knowledge of the kinematic structure and parameters of the robot system, such as camera and link parameters. The proposed visual servoing control scheme ensures the convergence of the image-features to desired trajectories, by using the estimated Jacobian matrix, which is proved by the Lyapunov stability theory. To show the effectiveness of the proposed scheme, simulation and experimental results are presented.
標簽： Versatile knowledge estimator servoing
上傳時間： 2016-08-26
上傳用戶：大三三
In an electromagnetic cloak based on a transformation approach, reduced sets of material properties are generally favored due to their easier implementation in reality, although a seemingly inevitable drawback of undesired reflection exists in such cloaks. Here we suggest using high-order transformations to create smooth moduli at the outer boundary of the cloak, therefore completely eliminating the detrimental scattering within the limit of geometric optics. We apply this scheme to a non-magnetic cylindrical cloak and demonstrate that the scattered field is reduced substantially in a cloak with optimal quadratic transformation as compared to its linear counterpart.
標簽： electromagnetic transformation properties approach
上傳時間： 2017-03-30
上傳用戶：pkkkkp
The application note covers the various domains of the FIFO architecture, improving data rate using the multiple buffering scheme, using the part in port I/O, slave FIFO or the GPIF
標簽： architecture application improving the
上傳時間： 2017-04-03
上傳用戶：變形金剛
This gorgeous, full-color book will guide you through the complete design process, from getting inspiration and sketching ideas out, through to choosing a color scheme, designing the layout, and selecting effective imagery. Throughout, the focus is on simple and practical techniques that anyone can use 鈥?you don鈥檛 need to have gone to art school or have artistic flair to create stunning designs using the methods outlined in this book. You鈥檒l follow along as author and design guru Jason Beaird creates a complete web site layout using the techniques that you鈥檝e learned. The book鈥檚 full-color layout and large format (8鈥?x 10鈥? make The Principles Of Beautiful Wed Design a pleasure to read.
標簽： full-color gorgeous complete getting
上傳時間： 2017-05-08
上傳用戶：2404
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