[通讯编程] Online-Android
基于Google Material Design设计开发的Android客户端,功能包含即时通信(Xmpp+Openfire),音视频聊天(WebRTC),在线视频(第三方开放平台api)等,初衷是能够通过这个项目来提升自己的开发技能,希望也能帮助到其他初学者,
The Android client, designed and developed based on Google Material Design, has functions including instant messaging (Xmpp+Openfire), audio and video chat (WebRTC), online video (third-party open platform api), etc. It is intended to improve its development skills through this project, and hopes to help other beginners, (2015-08-19, Java, 0KB, 下载0次)
[通讯编程] 导引辅助的信道估计
在单径瑞利信道中，设计一种时分的导引辅助的信道估计方法，用Simulink和m语言进行仿真，测量BPSK的误码率性能，画出比特信噪比与误码率的关系曲线，并与理论误码率曲线进行对比
In the single path Rayleigh channel, a time-division guidance aided channel estimation method is designed. The simulation is carried out with Simulink and M language. The BER performance of BPSK is measured, and the relationship curve between bit signal-to-noise ratio and BER is drawn, and compared with the theoretical BER curve (2021-03-21, Others, 37KB, 下载1次)
[通讯编程] 程序
1. 程序完成了BCH信道编码+BPSK调制解调技术在线性高斯白噪声环境下的通信仿真，并且绘制了多个编码格式下的误码率-比特信噪比（Eb/N0）仿真曲线
2. BPSKCode.m 主程序入口，运行该文件执行主程序
1. The program completes the communication simulation of BCH channel coding + BPSK modulation and demodulation technology in linear Gaussian white noise environment, and draws the simulation curves of BER bit signal to noise ratio (EB / N0) under multiple coding formats
2. Bpskcode. M main program entrance, run the file to execute the main program (2021-01-20, matlab, 5KB, 下载1次)
[通讯编程] 4
说明了卷积编解码的工作原理。用Simulink仿真卷积编码，并用Viterbi译码的方法进行解码，其中的编解码全部自己编写代码(S-Function方式)，在加性白高斯噪声信道中，画出比特信噪比与误码率的关系曲线
The principle of convolutional codec is explained. Simulink is used to simulate convolutional coding, and Viterbi decoding method is used to decode. All the coders and decoders write their own codes (S-function mode). In the additive white Gaussian noise channel, the relationship curve between bit signal-to-noise ratio and bit error rate is drawn (2020-12-29, matlab, 173KB, 下载0次)
[通讯编程] XX-Net
全局PAC智能代理，实现代理上网。实现类似大航海时代的游戏互联
Global PAC intelligent agent to implement proxy online (2017-11-27, Java, 50349KB, 下载1次)
[通讯编程] mars
这是腾讯近期开源的即时通信项目：mars的源码，对于想开发自己的即时通信软件的用户有很好的参考价值。
This is the Tencent's recent open source instant messaging project: Mars source code, for the development of their own instant messaging software users have a good reference value. (2017-10-15, C/C++, 20857KB, 下载3次)
[通讯编程] on-the-modulation-technology-in-OFDM
在 OFDM 数学原理和收发模型的基础上，本文对帧同步、定时同步、频率同
步和采样同步给 OFDM 系统所产生的影响进行了理论分析，同时讨论了基于循环
前缀或训练符号的典型 OFDM 同步算法。参考 802.11a 突发数据帧结构和系统参
数，分析几种 OFDM 同步算法用于突发分组传输的性能；在分析了几种经典的信
道估计算法基础上,通过对复杂度和性能的折衷，选择一种适合本文系统的估计
算法。最后作者提出一种改进型 LS 信道估计算法，该算法考虑了 LS 算法中噪声
的影响，从而提高了低信噪比下信道估计的精度。仿真结果表明，改进算法在低
信噪比下具有良好的性能。
OFDM mathematical principles and transceiver model based on frame synchronization, timing synchronization, frequency synchronization and sampling synchronization to the OFDM system, the impact of the theoretical analysis are also discussed based on the cyclic prefix or training symbols typical OFDM synchronization algorithm . Reference 802.11a burst data frame structure and system parameters, analyze several OFDM synchronization algorithm for burst packet transmission performance several classic channel estimation algorithm based on a compromise between complexity and performance, select a suitable estimation algorithm in this article. Finally, the author proposed a modified LS channel estimation algorithm that takes into account the effects of noise in the LS algorithm, thus improving the low SNR channel estimation accuracy. Simulation results show that the improved algorithm has good performance in low signal-to-noise ratio. (2013-05-10, Others, 8530KB, 下载64次)
[通讯编程] matlab
基于ofdm的信道系统源代码，包括调制、解调等。函数功能 ： 实现数据的QPSK调制—PLC信道传输—BPSK解调—得到误码率
is_noise 是否添加噪声：0 否，1 是
is_convenc 是否进行卷积编码： 0 否 , 1 是 ；——信道编码
interout 交织输出 interin 交织输入
chan_type PLC信道类型：0 无多径，1 四径模型，2 11径模型，3 AR模型，4 FIR模型；
snr 信噪比 (2013-04-26, matlab, 28KB, 下载48次)
[通讯编程] QmattlabqpskwP
QPSK在加性高斯白噪声环境下，信噪比与误码率的仿真。 先产生一个四组符号的序列，，再将该序列映射到对应的相位上。用相应的函数产生均值为零、方差为δ2的加性高斯噪声。
QPSK in additive white Gaussian noise environment, the signal to noise ratio and bit error rate simulation. First produce a sequence of four sets of symbols, then the sequence is mapped to the corresponding phase. The corresponding function with zero mean, variance δ2 additive Gaussian noise. (2012-07-11, Visual C++, 2KB, 下载10次)
[通讯编程] Alamouti
主函数Alamouti(Nr,max_snr,max_err_symbol,symbol_per_frame)
调用函数QpskMapping(psudo_bit_sequence)－－二进制数据到QPSK信号的变换
调用函数RayleighCH(Nr,Nt)－－瑞利衰落信道模拟
仿真示例：
Alamouti(1,12,20,24)
说明：
1.2根发射天线、1根接收天线
2.最高信噪比为12dB，即仿真范围为0dB到12dB
3.在每个信噪比条件下,误符号数超过20即停止该信噪比条件下的仿真
4.每一帧数据为24个QPSK符号
综合仿真函数SimAlamouti(max_snr,max_err_symbol,symbol_per_frame)
具有一根接收天线系统的SER性能与二根接收天线的系统SER性能比较
SimAlamouti(12,20,24)
参数说明：
1.max_err_symbol的取值直接影响了仿真的精度：取值越大，精度越高，误符号率曲线也更平滑；但需更长的仿真
时间
2.一般max_snr小于15dB，程序中snr为信号噪声功率比
3.本程序仿真时未考虑帧与帧之间，信道衰落系数的相关性，因此symbol_per_frame一定程度上表征了信道相关时
间的大小，即在symbol_per_frame个QPSK信号发送时间内，信道衰落系数是不变或缓变的，而在下一帧数据中，
信道衰落系数可以认为已变成另一值
4.本程序假定在接收端已通过信道估计获得信道衰落系数
ALAMOUTI performs Monte-Carlo simulation and estimates Bit Error Rate
(BER) of Alamouti Scheme [1] over Rayleigh channel. The scheme presumes
2 transmit (Tx) and arbitrary number of receive (Rx) elements.
If Rx=1 (one receive element) ALAMOUTI is transformed to the order 2
transmit diversity scheme with Maximum Ratio Combining (MRC). The
modulation format is MPSK with arbitrary order M which can be
controlled by user. (2012-04-05, matlab, 199KB, 下载49次)
[通讯编程] DS-CDMA-with-PASTd-MUD-with-m-DS
DS-CDMA链路中加入基于子空间的PASTd多用户检测方法。系统中采用m序列阔频，可以通过高斯信道或瑞利信道。可以直接运行得到不同信噪比下的误码率曲线。
DS-CDMA link added Subspace-based multiuser detector PASTd. M sequence used in the system wide-band, Gaussian channel, or by Rayleigh channel. Get different signal to noise ratio can be run directly under the BER curves. (2011-06-29, matlab, 197KB, 下载43次)
[通讯编程] 1
在简要介绍信道容量概念的基础上，简单介绍了一般信道信道容量的计算步骤，并提出它的局限性。然后在其基础上详细的介绍了更为广泛的一般信道的信道容量的计算方法一迭代法以及它在C++中的实现过程。
In a brief letter of introduction channel capacity based on the concept, briefly introduced the general channel capacity channel calculation steps, and make its limitations. Then in his detailed introduction on the basis of a more extensive general channel calculation of channel capacity of a iteration method and its C++ in the implementation process. (2010-05-27, Visual C++, 92KB, 下载5次)
[通讯编程] SMS
企业短信群发系统.系统提供了常用短语模块，通过此模块用户可以选择一些常用的短语作为短信的内容，同时还可以自定义一些常用的短语以及删除一些不想要的短语。
Enterprise Short Message System. System provides a common phrase in the module, through this module the user can choose a number of commonly used phrases as the message content, but also can customize a number of commonly used phrases, as well as delete some of the phrases do not want. (2010-02-16, C#, 1370KB, 下载4次)
[通讯编程] Android
Android操作系统平台.仅仅几年之前，电子行业的大多数工程师都还认为Google公司不过是一家提供搜索服务的企业；但如今，已经很少有人不知道Google公司已经进入了数字消费类电子领域。美国的移动运营商T-MobileUSA公司于2008年10月22日正式上市由中国台湾地区的HTC公司开发的T-Mobile G1手机，这款手机采用了由Google公司开发的手机平台Android。
Android (2010-01-07, C++, 908KB, 下载5次)
[通讯编程] lpc-demo
图形图象
图片显示
2D图形编程
3D图形编程
绘图程序
波变换
GIS编程
分形几何
图形图像处理
OpenGL
图形/文字识别
压缩解压
加密解密
CA认证
数值算法/人工智能
STL
数据结构
数学计算
人工智能/神经网络
matlab例程
生物技术
Java编程
Applet
游戏
JavaScript
Jsp/Servlet
Ajax
*行业应用
医药行业
金融证券系统
教育系统应用
企业管理
邮电通讯系统
OA系统
电子政务应用
酒店行业
百货/超市行业
交通/航空行业
能源行业(电力石油煤炭)
家庭/个人应用
其他行业
数据库系统
Oracle数据库
SQL Server
MySQL数据库
其他数据库
汇编语言
SCSI/ASPI
编译器/解释器
磁盘工具
语音合成与识别
编辑器/阅读器
杀毒
中文信息处理
FlashMX源码
并行计算
书籍源码
Delphi控件源码
操作系统开发
中间件编程
dfdsaj fwefdsfdsdfdsfddf sdfdsafdsfwqddfeeddfdf dfds (2009-10-14, VFP, 624KB, 下载44次)
[通讯编程] InformationTheoryAndCodingTechniques
信息论是由通信技术、概率论、随机过程和数理统计等相结合逐步发展而形成的一门新兴科学。其奠基人是美国数学家香农，他的《通信的数学原理》奠定了信息论的基础。
这是信息论与编码技术的教学课件。压缩包内含有6个ppt文件，每个ppt自成一章:1绪论、2信源及其熵、3信道及其容量、4信息率失真函数、5信源编码、6信道编码。是初学信息论的最好材料。
Information communication technology is, probability theory and mathematical statistics, stochastic processes, such as the combination formed by the progressive development of an emerging science. The founders of the United States Shannon mathematician, his " Mathematical Theory of Communication" has laid a foundation of information theory. This is the information theory and coding technology courseware. Compressed packet contains 6 ppt documents, each a separate chapter ppt: 1 Introduction, 2 source and its entropy, and its 3-channel capacity, information rate-distortion function 4, 5, source coding, channel coding 6. Information theory is the best learning materials. (2009-04-11, PPT, 3372KB, 下载53次)
[通讯编程] my_decode_float
该文件夹中的SC_TurboIC_MIMO_0524.m是将我turbo的编译码模块替换原来B3G系统中的turbo编译码模块而重新得到的.
定点仿真得,在比特信噪比>=0.5db时,经过一次大迭代,误码率接近0
当然,要得到更精确的结果,需要更多的仿真.
The folder is my SC_TurboIC_MIMO_0524.m the turbo codec module to replace the original B3G system turbo codec module and re-received. Fixed-point simulation was, in the bit signal to noise ratio (2009-01-07, matlab, 8KB, 下载12次)
[通讯编程] 2008_3
（1）请推导出单径瑞利信道中的BPSK相干解调的理论误码率性能，并画出比特信噪比与误码率的关系曲线。
（2）在单径瑞利信道中，请设计一种时分的导引辅助的信道估计方法，用Simulink进行仿真，测量BPSK的误码率性能，画出比特信噪比与误码率的关系曲线，并与(1)的曲线进行对比。
(1) derived from single-Path Rayleigh channel coherent demodulation of BPSK theoretical bit error rate performance and draw-bit signal to noise ratio and bit error rate curve. (2) in a single Path Rayleigh channel, please design a guided night-assisted channel estimation methods, using Simulink simulation, surveying BPSK BER performance, drawn-bit signal to noise ratio and bit error rate curve, and with (1) comparing the curve. (2008-12-25, matlab, 49KB, 下载375次)
[通讯编程] SmsSend20080225
移动，联通的多种短信协议，原程序包括SMPP,CMPP,SGIP,东信CMPP网关等客户端。
其中SMPP有长短信的格式。多年的心血，奉献给需要的人。
主要测试网关时，比较有用。
有问题请发email:leafboyman@tom.com
Mobile, Unicom, a variety of messaging protocol, the original procedures, including SMPP, CMPP, SGIP, Dongxin CMPP gateways such as the client. SMPP messages which have long-term format. Years of hard work, dedication to the needy. The main test gateway, the more useful. There are problems please send an email: leafboyman@tom.com (2008-06-17, Visual C++, 129KB, 下载330次)
[通讯编程] MIMO-performances
对ALamouti方案中输入输出为（2，1）的情况下，随信噪比的增大的误码率性能进行了仿真。并将其与没有任何分集的单发单收小性能做了对比。
ALamouti program for input and output for the (2,1), the signal to noise ratio increases with the BER performance is simulated. And diversity and there is no single collection of a single small to do a comparison of performance. (2008-05-01, matlab, 1KB, 下载110次)