Modbus serial port access through the on

这是一份关于串口编程的读书笔记，对于使 用VC进行编程的同行应该有一定的帮助。-This a serial programming on the study notes, for the use of VC peer program should be some help.

SYMPCHUNK sets the number of symbols demodulated at once with a constant carrier frequency and symbol timing offset. This is a fundamental decoder parameter that establishes its carrier and symbol timing tracking bandwidth. Set it too low and the demodulator can"t accurately determine carrier frequency and symbol timing on a noisy signal. Set it too high and the demodulator may not be able to track large symbol rate offsets caused by Doppler shift and/or A/D or spacecraft clock errors. Or it might have trouble tracking high rates of change in the carrier frequency due to Doppler acceleration.The current value of SYMPCHUNK is 4*N1 = 512, where N1 = 128 is the order of the convolutional interleaver. 512 symbols is 512 milliseconds at 1000 symbols/sec, giving a frequency/time determination SNR that is 10*log10(512) = 27 dB greater than the Es/N0, not counti

gprs接收系统。包括网络，数据库功能。-gprs reception system. Including network, database functions.

这个实际上是个总的GUI程序，已经完整编写好。此程序包括elm的3种training方法，以及硬件衔接的问题，只是其中的一些特殊路径需要做相应改动，才能使程序真正运行-this actually is a total of GUI program has been well prepared integrity. This process includes three types of elm training methods, and the convergence of the hardware, just some special needs to be done path corresponding changes to procedures can actually run

RS码的编译码源程序，是在高斯信道下实现的-RS encryption source code is the Gauss channel under the

Mobile平台下GPRS上网连接方式，包括CMNET和CMWAP！-Mobile Platform GPRS Internet connection, including CMNet and CMWAP!

一个非常完全的waveOut程序，包括了一个waveOut类和使用类的范例，这个范例获得Windows下所有的wave输入输出设备的名称以及属性 -A very complete waveOut procedures, including a category and use category waveOut example, access to Windows, under this example all the wave input and output devices as well as the attribute name

应用背景最近的研究表明，超过70%的可用频谱没有有效地利用。由于频率不足，带宽变得昂贵。因此，为了有效地利用频谱，我们需要嗅的频谱，以确定它是否被使用的主要用户或不。认知无线电是指利用频谱感知的信息通过无线电参数。在文献中提出的各种频谱感知技术，但仍有研究人员在这一领域探索更先进的方法。频谱感知技术主要有三类：发射检测、接收检测和干扰温度检测。关键技术联邦通信委员会（联邦通信委员会）负责对美国的州际通信，管理和许可的电磁频谱在美国和它执行要求在所有无线电频率波段的跨站干扰。他们许可段特定的用户在特定的地理区域。只要遵循一定的权力规定，任何人都可以使用少量的、小型的、无牌的乐队供人使用。随着最近在个人无线技术的蓬勃发展，这些无牌乐队已经变得拥挤，从无线网络到数字的无线电话。为了打击过度拥挤，联邦通信委员会一直在探索新的方法来管理射频资源。基本的想法是让人们使用许可的频率，只要他们可以保证受原许可证持有人的干扰将是最小的。随着软件和认知无线电技术的进步，这一方法在地平线上是可行的。认知无线电能够巧妙地感知和适应随着环境的变化改变其传输参数，如调制，频率，帧格式等。

c开发的串口操作函数,可以应用于串口类开发程序-This COM operation function is developed by C,which can be used for COM develepment.

SMTP协议的标准文档，IETF的RFC中文版-SMTP protocol standards documents, the IETF RFC Chinese version