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costas loop 2. Bpsk symbols

设计一种快跳频通信系统，仿真其中的序列和性能，并给出系统框图。-Design of a fast frequency-hopping communication systems, simulation and performance of the sequence, and gives the system diagram.

通过实现电子邮件的自动寻呼功能，介绍串口编程技术与MAPI技术相结合的方法-E-mail through the realization of the automatic paging feature, introduce technology and MAPI serial programming method of combining technology

资源描述方波、正弦波、锯齿波、三角波、扫频信号发生器FPGA实现，其中信号频率通过改变NCO频率控制字，其中方波占空比可以改变，几个模块都通过硬件验证，NCO控制字32位，精度高

基于广域网的语音聊天系统，任一端可以发起连接，但先的知道对方IP-based WAN voice chat system, the end should be initiated connectivity, but the first to know each other IP

通过打印口（rs232)测试pic编程器的小程序。-This is a small program to test pic progamme implements by LPT(rs232).

单音信号的一些频率估计程序，最大似然方法,Pisarenko法等。-This site presents some Matlab (tm) code for estimation of the frequency of a single, constant tone in noise. While these methods may be extended to the multiharmonic and multi-tone cases, these programs do not include this extension.

信道编码中的霍夫曼编码在matlab环境下的实现-Huffman coding

IEC61375-1列车通信总线(TCN)协议中文翻译。-IEC61375-1 Train Communication Bus (TCN) Chinese translation of the agreement.

因特殊的业务需要，某些电话交流需要在第三方的监视下进行，假定某电话交流由甲乙丙三方发起，丙为监听控制方，当甲开始说话时，丙可以不允许乙听，并且开始录音，当甲说完时，丙确定是否可以让乙听，如可以。给乙放录音，当乙说话时，重复以上操作。-because of special operational needs, some telephone exchanges in the surveillance of third parties under the assumption that a telephone exchange was launched by the tripartite B, and C to monitor the controlling party, began to speak when the A, B C can not listen, and began recording at the end when A and C to determine whether or not they can B listen, if we can. B recordings to release, when the B words, to repeat the operation.