為滿足無線網絡技術具有低功耗、節點體積小、網絡容量大、網絡傳輸可靠等技術要求,設計了一種以MSP430單片機和CC2420射頻收發器組成的無線傳感節點。通過分析其節點組成,提出了ZigBee技術中的幾種網絡拓撲形式,并研究了ZigBee路由算法。針對不同的傳輸要求形式選用不同的網絡拓撲形式可以盡大可能地減少系統成本。同時針對不同網絡選用正確的ZigBee路由算法有效地減少了網絡能量消耗,提高了系統的可靠性。應用試驗表明,采用ZigBee方式通信可以提高傳輸速率且覆蓋范圍大,與傳統的有線通信方式相比可以節約40%左右的成本。 Abstract: To improve the proposed technical requirements such as low-ower, small nodes, large capacity and reliable network transmission, wireless sensor nodes based on MSP430 MCU and CC2420 RF transceiver were designed. This paper provided network topology of ZigBee technology by analysing the component of the nodes and researched ZigBee routing algorIthm. Aiming at different requirements of transmission mode to choose the different network topologies form can most likely reduce the system cost. And aiming at different network to choose the correct ZigBee routing algorIthm can effectively reduced the network energy consumption and improved the reliability of the system. Results show that the communication which used ZigBee mode can improve the transmission rate, cover more area and reduce 40% cost compared with traditional wired communications mode.
上傳時間: 2013-10-09
上傳用戶:robter
Verilog_HDL的基本語法詳解(夏宇聞版):Verilog HDL是一種用于數字邏輯電路設計的語言。用Verilog HDL描述的電路設計就是該電路的Verilog HDL模型。Verilog HDL既是一種行為描述的語言也是一種結構描述的語言。這也就是說,既可以用電路的功能描述也可以用元器件和它們之間的連接來建立所設計電路的Verilog HDL模型。Verilog模型可以是實際電路的不同級別的抽象。這些抽象的級別和它們對應的模型類型共有以下五種: 系統級(system):用高級語言結構實現設計模塊的外部性能的模型。 算法級(algorIthm):用高級語言結構實現設計算法的模型。 RTL級(Register Transfer Level):描述數據在寄存器之間流動和如何處理這些數據的模型。 門級(gate-level):描述邏輯門以及邏輯門之間的連接的模型。 開關級(switch-level):描述器件中三極管和儲存節點以及它們之間連接的模型。 一個復雜電路系統的完整Verilog HDL模型是由若干個Verilog HDL模塊構成的,每一個模塊又可以由若干個子模塊構成。其中有些模塊需要綜合成具體電路,而有些模塊只是與用戶所設計的模塊交互的現存電路或激勵信號源。利用Verilog HDL語言結構所提供的這種功能就可以構造一個模塊間的清晰層次結構來描述極其復雜的大型設計,并對所作設計的邏輯電路進行嚴格的驗證。 Verilog HDL行為描述語言作為一種結構化和過程性的語言,其語法結構非常適合于算法級和RTL級的模型設計。這種行為描述語言具有以下功能: · 可描述順序執行或并行執行的程序結構。 · 用延遲表達式或事件表達式來明確地控制過程的啟動時間。 · 通過命名的事件來觸發其它過程里的激活行為或停止行為。 · 提供了條件、if-else、case、循環程序結構。 · 提供了可帶參數且非零延續時間的任務(task)程序結構。 · 提供了可定義新的操作符的函數結構(function)。 · 提供了用于建立表達式的算術運算符、邏輯運算符、位運算符。 · Verilog HDL語言作為一種結構化的語言也非常適合于門級和開關級的模型設計。因其結構化的特點又使它具有以下功能: - 提供了完整的一套組合型原語(primitive); - 提供了雙向通路和電阻器件的原語; - 可建立MOS器件的電荷分享和電荷衰減動態模型。 Verilog HDL的構造性語句可以精確地建立信號的模型。這是因為在Verilog HDL中,提供了延遲和輸出強度的原語來建立精確程度很高的信號模型。信號值可以有不同的的強度,可以通過設定寬范圍的模糊值來降低不確定條件的影響。 Verilog HDL作為一種高級的硬件描述編程語言,有著類似C語言的風格。其中有許多語句如:if語句、case語句等和C語言中的對應語句十分相似。如果讀者已經掌握C語言編程的基礎,那么學習Verilog HDL并不困難,我們只要對Verilog HDL某些語句的特殊方面著重理解,并加強上機練習就能很好地掌握它,利用它的強大功能來設計復雜的數字邏輯電路。下面我們將對Verilog HDL中的基本語法逐一加以介紹。
標簽: Verilog_HDL
上傳時間: 2014-12-04
上傳用戶:cppersonal
This application note describes the implementation of a two-dimensional Rank Order filter. Thereference design includes the RTL VHDL implementation of an efficient sorting algorIthm. Thedesign is parameterizable for input/output precision, color standards, filter kernel size,maximum horizontal resolution, and implementation options. The rank to be selected can bemodified dynamically, and the actual horizontal resolution is picked up automatically from theinput synchronization signals. The design has a fully synchronous interface through the ce, clk,and rst ports.
上傳時間: 2013-12-14
上傳用戶:逗逗666
波長信號的解調是實現光纖光柵傳感網絡的關鍵,基于現有的光纖光柵傳感器解調方法,提出一種基于FPGA的雙匹配光纖光柵解調方法,此系統是一種高速率、高精度、低成本的解調系統,并且通過引入雙匹配光柵有效地克服了雙值問題同時擴大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設計,綜合考慮系統的解調精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 Abstract: Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network, based on several existing methods of fiber grating sensor demodulation inadequate, a two-match fiber grating demodulation method was presented. This system is a high-speed, high precision, low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA,this paper gives the curve fitting algorIthm based on Lagrange.
上傳時間: 2013-10-10
上傳用戶:zxc23456789
Logger iButton devices have gained a lot of popularity with researchers. Although free evaluation software is easy to use and welldocumented, the choices and inputs that need to be made can sometimes be challenging. This application note explains technicalterms that are common with temperature logger iButtons and how they relate to each other. Additionally, it presents an algorIthm tohelp users choose the necessary input parameters, including the sample rate based on a user's needs and the available memory tostore the data.
上傳時間: 2013-11-16
上傳用戶:xywhw1
MD5算法研究 最新的,具體內容看文章 Message-Digest algorIthm 5它的英文名字
上傳時間: 2015-01-10
上傳用戶:windwolf2000
The enclosed VB project includes a VB class that implements the Rijndael AES block encryption algorIthm. The form in the project runs some test data through the class.
標簽: implements encryption Rijndael enclosed
上傳時間: 2015-01-30
上傳用戶:JIUSHICHEN
java人工股市源碼,用了GA(Genetic algorIthm)和ANN(Artificial Neural Network)。內附程序詳細說明,強烈推薦!
上傳時間: 2015-02-26
上傳用戶:TRIFCT
This scheme is initiated by Ziv and Lempel [1]. A slightly modified version is described by Storer and Szymanski [2]. An implementation using a binary tree is proposed by Bell [3]. The algorIthm is quite simple: Keep a ring buffer, which initially contains "space" characters only. Read several letters from the file to the buffer. Then search the buffer for the longest string that matches the letters just read, and send its length and position in the buffer.
標簽: initiated described modified slightly
上傳時間: 2014-01-09
上傳用戶:sk5201314
RSA MD5 VISUAL C++ SOURCE CODE v1.2 - Visual C++ implementation of the RSA MD5 message digest algorIthm. Calculates a 32byte checksum for any data sequence. Developed by Langfine Ltd. Note, RSA copyright notices must be adhered to - see the source code for details.Released November 2001
標簽: implementation RSA MD5 message
上傳時間: 2015-03-23
上傳用戶:saharawalker