自己用delphi写的无线传感器网络的源码，配合hellicom公司的硬件设备可以搭建无线传感器网络...

第 3 部分卫星通信的基本原理在卫星通信中采用的调制技术1.早期的通信2.同时传输多个信号3.调制类型4.数字调制的量化数据5.数字调制技术 — — CW （常数振幅）6.正交幅度调制 （QAM）7.恢复数据包错误8.振幅和相移键控 （APSK）9.数字调制-决定区域

I2C to 8-bit Parallel Bus Slave Design

In this simulink model , 16-QAM modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.-In this simulink model , 16-QAM modulation and demodulation is simulated .A square root raised cosine pulse shaped signal is modulated and given as input to the demodulator.The received signal is demodulated and given to the detector where it is matched filtered and down-sampled .The effects of symbol timing offset can be seen by varying the phase of down-sampling operation.The signal transmitted is recovered at the detector output.

用VC写的GPRS串行通信界面,功能比较齐全-VC write GPRS serial communication interface, more complete function

完整的短信管理系统.delphi实现.可以支持GSM大多数手机的短信收发,管理.-Complete message management system. Delphi realize. Can support the majority of GSM mobile phones to send and receive message, management.

数字滤波器的C语言实现，包括高通、低通、带通滤波器-Digital Filter C language, including high- and low-pass, band-pass filter

this a source code which can use for encryption of voice signal by using the kasami sequence.Kasami sequence is a pseudo random sequence. -this is a source code which can use for encryption of voice signal by using the kasami sequence.Kasami sequence is a pseudo random sequence.

QR 二维码符号规格（不包括空白区）21×21 模块到177×177 模块（版本1到40，每版本符号每边增加4 个模块）。每个符号的数据字符数（最大规格的符号—版本40-L）数字数据为7089 个，字符字母数字数据为 4296 个字符，8 位字节数据为2953 个字符，日本汉字数据为1817 个字符，中国汉字数据为21008 个字符 。[21]Marks & Spencer 是第一家在英国包装市场上使用这种编码的公司。零售商介绍到在今年的早些时候，他们已经在所有果汁包装上使用这种编码上进行了8 周的试验。顾客能通过扫描解码得到每天提供的包括产品的趣闻，细节等信息。Marks& Spencer 高级包装技术师马克思高尔(Mark Caul)说:“QR 二维码是一个不靠增加包装尺寸或者标签空间而和顾客进行交流的梦幻机会。通过使用移动手机技术，能获得这种产品的原始故事或者在这款包装背后的故事，更有甚者，能获得使用须知的电影视频，这一切的一切都能在手机屏幕上剪裁播放。” Mar

文章中提出了一种改进型RLS算法，并将其用于信道估值与信道均衡-Article proposes a modified RLS algorithm, and used in the valuation channel and channel equalization

A document about IrDA physical layer