ZBCOM-100/200IE是工業級RS232/RS485/RS422三合一串口和無線ZigBee數據轉換設備,支持串口透明傳輸(點多點和點對多點)和空中升級,設備串口可通過撥碼開關靈活設置成RS-232或RS-422或RS-485模式,利用它可以輕松實現串口設備無線化,免去布線煩惱,節省人力物力和開發時間,使產品更快的投入市場,增強競爭力。該設備為工業級產品,工作溫度范圍為-25℃ ~ +75℃。采用周立功公司代理的CEL的ZigBee模塊,頻率2400 ~ 2483.5MHz(16個RF通道),數據速率可配置為250Kbps、500Kbps和1Mbps,具有低功耗、高靈敏度和傳送距離遠等特點。串口通訊波特率最高支持115200bps,支持串口數據透明轉發,支持本地和空中配置以及固件升級,使用起來簡單方便。
上傳時間: 2013-11-14
上傳用戶:jjj0202
cc1020操作源碼,A true single-chip narrowband RF Transceiver
上傳時間: 2013-12-11
上傳用戶:youlongjian0
ZigBee™ 是專為低速率傳感器和控制網絡設計的無線網絡協議。有許多應用可從ZigBee 協議受益,其中可能的一些應用有:建筑自動化網絡、住宅安防系統、工業控制網絡、遠程抄表以及PC 外設。此程序包提供的是Zigbee協義棧函數庫源代碼,它實現了一個與物理層 無關的應用程序接口。 因此,無需做重大修改就可以輕松地在射頻(Radio Frequency,RF)收發器之間移植應用程序。
上傳時間: 2014-01-16
上傳用戶:Pzj
用AVR單片機ATMega32通過U2270B讀取H4001只讀RFID卡號的范例,H4001卡有關信息,采用曼切斯特編碼,125Khz,RF/64,位周期512uS,激光編程64位ID。
上傳時間: 2013-12-23
上傳用戶:開懷常笑
隨著無線mesh網絡的普及,其規模和復雜程度持續發展。然而多跳的mesh網絡遇到越來越多的難題,比如帶寬降低,無線干擾以及網絡時延等。譬如,在網絡中的每一跳吞吐量會下降多達50%,連續多跳情況下吞吐量下降得更迅速,其結果將導致網絡性能的嚴重降低。在語音和視頻應用大量運行的極端情況下,時延和RF干擾將達到不可接受的程度,而導致連接完全中斷
上傳時間: 2015-09-08
上傳用戶:海陸空653
隨著無線mesh網絡的普及,其規模和復雜程度持續發展。然而多跳的mesh網絡遇到越來越多的難題,比如帶寬降低,無線干擾以及網絡時延等。譬如,在網絡中的每一跳吞吐量會下降多達50%,連續多跳情況下吞吐量下降得更迅速,其結果將導致網絡性能的嚴重降低。在語音和視頻應用大量運行的極端情況下,時延和RF干擾將達到不可接受的程度,而導致連接完全中斷
上傳時間: 2013-11-27
上傳用戶:xc216
A system simulation environment in Matlab/Simulink of RFID is constructed in this paper. Special attention is emphasized on the analog/RF circuit.Negative effects are concerned in the system model,such as phase noise of the local oscillator,TX-RX coupling,reflection of the environment, AWGN noise,DC offset,I/Q mismatch,etc.Performance of the whole system can be evaluated by changing the coding method,parameters of building blocks,and operation distance.Finally,some simulation results are presented in this paper.
標簽: environment constructed simulation Simulink
上傳時間: 2014-01-09
上傳用戶:zhangliming420
通過SPI接口,同RF傳輸芯片CC2500的通訊代碼
上傳時間: 2015-11-26
上傳用戶:youke111
讓您通過VB介面,簡易地測試8051上面的40Hz的RF通訊。
標簽:
上傳時間: 2014-01-07
上傳用戶:gundamwzc
Carrier-phase synchronization can be approached in a general manner by estimating the multiplicative distortion (MD) to which a baseband received signal in an RF or coherent optical transmission system is subjected. This paper presents a unified modeling and estimation of the MD in finite-alphabet digital communication systems. A simple form of MD is the camer phase exp GO) which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for amplitude as well as phase variations of the MD. We assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly-varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme.
標簽: synchronization Carrier-phase multiplicativ approached
上傳時間: 2013-11-28
上傳用戶:windwolf2000