ZBCOM-100/200IE是工业级RS232/RS485/RS422三合一串口和无线ZigBee数据转换设备,支持串口透明传输(点多点和点对多点)和空中升级,设备串口可通过拨码开关灵活设置成RS-232或RS-422或RS-485模式,利用它可以轻松实现串口设备无线化,免去布线烦恼,节省人力物力和开发时间,使产品更快的投入市场,增强竞争力。该设备为工业级产品,工作温度范围为-25℃ ~ +75℃。采用周立功公司代理的CEL的ZigBee模块,频率2400 ~ 2483.5MHz(16个RF通道),数据速率可配置为250Kbps、500Kbps和1Mbps,具有低功耗、高灵敏度和传送距离远等特点。串口通讯波特率最高支持115200bps,支持串口数据透明转发,支持本地和空中配置以及固件升级,使用起来简单方便。
上传时间: 2013-11-14
上传用户:jjj0202
cc1020操作源码,A true single-chip narrowband RF Transceiver
上传时间: 2013-12-11
上传用户:youlongjian0
ZigBee™ 是专为低速率传感器和控制网络设计的无线网络协议。有许多应用可从ZigBee 协议受益,其中可能的一些应用有:建筑自动化网络、住宅安防系统、工业控制网络、远程抄表以及PC 外设。此程序包提供的是Zigbee协义栈函数库源代码,它实现了一个与物理层 无关的应用程序接口。 因此,无需做重大修改就可以轻松地在射频(Radio Frequency,RF)收发器之间移植应用程序。
上传时间: 2014-01-16
上传用户:Pzj
用AVR单片机ATMega32通过U2270B读取H4001只读RFID卡号的范例,H4001卡有关信息,采用曼切斯特编码,125Khz,RF/64,位周期512uS,激光编程64位ID。
上传时间: 2013-12-23
上传用户:开怀常笑
随着无线mesh网络的普及,其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题,比如带宽降低,无线干扰以及网络时延等。譬如,在网络中的每一跳吞吐量会下降多达50%,连续多跳情况下吞吐量下降得更迅速,其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下,时延和RF干扰将达到不可接受的程度,而导致连接完全中断
上传时间: 2015-09-08
上传用户:海陆空653
随着无线mesh网络的普及,其规模和复杂程度持续发展。然而多跳的mesh网络遇到越来越多的难题,比如带宽降低,无线干扰以及网络时延等。譬如,在网络中的每一跳吞吐量会下降多达50%,连续多跳情况下吞吐量下降得更迅速,其结果将导致网络性能的严重降低。在语音和视频应用大量运行的极端情况下,时延和RF干扰将达到不可接受的程度,而导致连接完全中断
上传时间: 2013-11-27
上传用户: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.
标签: environment constructed simulation Simulink
上传时间: 2014-01-09
上传用户:zhangliming420
通过SPI接口,同RF传输芯片CC2500的通讯代码
上传时间: 2015-11-26
上传用户:youke111
让您通过VB介面,简易地测试8051上面的40Hz的RF通讯。
标签:
上传时间: 2014-01-07
上传用户: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.
标签: synchronization Carrier-phase multiplicativ approached
上传时间: 2013-11-28
上传用户:windwolf2000