回调函数 function callback

编码、通信中移位寄存器综合MFC版本-coding, communications shift register integrated version of MFC

食堂饭卡消费系统完整原代码，VC6.0+SQL+MSCOMM。-Canteen consumption饭卡integrity of the original system code, VC6.0+ SQL+ MSCOMM.

XComDrv是个通讯包，包含两个控件：TXComm，封装了一个通讯设备的若干特性；TXModem，MODEM与MODEM通讯的控件。最新的版本支持：定制流控制；任意波特率；完全的数据控制；指定事件字符；收/发数据；插件。TXModem可以用来：向MODEM设备发送AT指令；修改MODEM寄存器；拨号；连接；断开。最新版本包括XAsync v.1.2，异步（覆盖式）操作单元。功能无限制。源代码：包含，还有EXE演示。适用语言：CB4 CB5 D4 D5-XComDrv is a communications package that contains two controls: TXComm, Packaging, a number of characteristics of communications equipment TXModem, MODEM control communications with the MODEM. The latest version supports: customized flow control arbitrary baud rate incomplete data control designated events characters admission/fat data plug. TXModem can be used to: MODEM equipment to send AT commands amend MODEM register dial-up connection disconnected. The latest version include XAsync v.1.2, Asynchronous (cover type) operation unit. Features unlimited. Source code: contains, as well as EXE demo. Applicable language: CB4 CB5 D4 D5

仿真载频为2GHz，带宽1MHz，子载波数128个，cp为16，子载波间隔为7.8125kHz 一个ofdm符号长度为128us，cp长度为16us，采用16QAM调制方式，最大doppler频率为132Hz 采用LMMSE估计和LS估计算法并进行了比较

zigbee网络中存在不同功能的节点，不同功能的节点组成一个组，从而减少通信，实现命令同步，zigbee通信方式有广播点播和组播，此时应用的为组播方式。 

新华龙公司USB转232芯片CP2102的资料-Hualong company new 232 chip USB to the CP2102 information

这是一份介绍SIP协议的PPT，详细介绍了SIP协议，可以帮助SIP开发人员理解SIP协议各个消息中的头域，以及应用流程。-this is a point for the sip, it introduces the protocol of sip, it can help for programer for understanding the part

jtapi是java针对modem的开发，可以手机和电脑连接起来，进行通行-jtapi

Basic CDMA Principles • Coding • Forward and Reverse Channels
CDMA Operational Details • Multiplexing, Forward and Reverse Power Control
CDMA Handset Architecture
CDMA Handoffs
CDMA Network Architecture
CDMA Messaging and Call Flow
Optional Topics
Wireless Multiple Access Technologies
Overview of Current Technologies • Capacity CDMA Overlays, Spectrum Clearing-
Basic CDMA Principles • Coding • Forward and Reverse Channels
CDMA Operational Details • Multiplexing, Forward and Reverse Power Control
CDMA Handset Architecture
CDMA Handoffs
CDMA Network Architecture
CDMA Messaging and Call Flow
Optional Topics
Wireless Multiple Access Technologies
Overview of Current Technologies • Capacity CDMA Overlays, Spectrum Clearing

关于通讯基本概念的介绍容易混淆的东西很长知识-on communications on the basic concepts of easy to confuse things a very long knowledge