业余无线电通信的通信葵花宝典生产，推荐…

bpsk映射和解映射 实现01序列和+1 -1序列的相互转变-BPSK mapping realize reconciliation mapped 01 sequence and+ 1-1 sequence changes in the mutual

A. 产生一个长为1000的二进制随机序列，“0”的概率为0.8，”1”的概率为0.2；B. 对上述数据进行归零AMI编码，脉冲宽度为符号宽度的50%，波形采样率为符号率的8倍，画出前20个符号对应的波形（同时给出前20位信源序列）；C. 改用HDB3码，画出前20个符号对应的波形；D. 改用密勒码，画出前20个符号对应的波形；E. 分别对上述1000个符号的波形进行功率谱估计，画出功率谱；F. 改变信源“0”的概率，观察AMI码的功率谱变化情况；-have a length of 1,000 random binary sequence, "0" with a probability of 0.8, "a" with a probability of 0.2; B. above zero AMI data coding, and pulse width of symbols width of 50%, waveform sampling rate Symbol rate for the eight times that he painted before the 20 symbols corresponding waveforms (also given before 20 Source sequence); C. HDB3 code switch to depict the former 20 symbols corresponding waveform; D. Miller to switch codes to depict the former 20 symbols corresponding waveform; E. respectively above 1,000 symbols for the power spectrum waveform estimated to depict the power spectrum; F. Change source "0" the probability to observe AMI code changes in the power spectrum;

psk技术实现，并有详细的程序，有助于通信软件的开发-psk technology, and the detailed procedures, contribute to the development of communications software

用你的语音Modem实现像电话一样通话的程序-Using your modem to implement talking app as phone

rtp document , it is useful for learning rtp-rtp document, it is useful for learning rtp

虚拟信号功率谱测量仪的设计，此系统可以可以产生正弦信号和白噪声时域信号波形，以及混杂噪声的正弦波波形，信噪比可调并可进行上述三种不同信号的FFT功率谱及FFT功率谱密度测量。

采用自适应子信道和部分信道信息的功率分配的正交频分复用（OFDM）系统。以前的；

OpenH323 DLL libraries

与hollysys FM197 通讯 校时-Communication with the school when hollysys FM197

利用TCPIP实现Chat功能的程序,分客户端程序和服务端程序。-use TCPIP achieve Chat function procedures, sub-client and server-side procedures.