[通讯编程] 信道估计
在三条径的瑞利信道中，对于直接序列扩频：
(1)设计DS-CDMA一种具体的码分导引辅助的信道估计方法，接收机分别采用等均益合并、最大比合并。
(2)设频率已经同步，设计DS-CDMA一种具体的单停顿滑动相关时间同步方法。
(3)设时间已经同步，设计DS-CDMA一种具体的频率同步方法，画出比特信噪比与频率同步误差的关系曲线。
In the three path Rayleigh channel, for direct sequence spread spectrum:
(1) A specific channel estimation method aided by code division and guidance is designed for DS-CDMA. The receiver adopts equal average combining and maximum ratio combining respectively.
(2) Assuming that the frequency has been synchronized, a specific single pause sliding correlation time synchronization method for DS-CDMA is designed.
(3) Assuming that time has been synchronized, a specific frequency synchronization method of DS-CDMA is designed, and the relationship curve between bit signal-to-noise ratio and frequency synchronization error is drawn. (2021-03-21, Others, 16KB, 下载1次)
[通讯编程] OFDM submit
本文设计了一个基于IFFT/FFT算法与802.11a标准的OFDM系统，并在计算机上进行了仿真和结果分析。重点在OFDM系统设计与仿真，在这部分详细介绍了系统各个环节所使用的技术对系统性能的影响。在仿真过程中对OFDM信号使用QPSK调制，并在AWGN信道下传输，最后解调后得出误码率。整个过程都是在MATLAB环境下仿真实现，对ODFM系统的仿真结果及性能进行分析，通过仿真得到信噪比与误码率之间的关系，为该系统的具体实现提供了大量有用数据。
In this paper, an OFDM system based on IFFT / FFT algorithm and 802.11a standard is designed and simulated on computer. The emphasis is on the design and Simulation of OFDM system. In this part, the influence of the technology used in each link of the system on the system performance is introduced in detail. In the simulation process, the OFDM signal is modulated by QPSK and transmitted in AWGN channel. Finally, the bit error rate is obtained after demodulation. The whole process is simulated in Matlab environment. The simulation results and performance of ODFM system are analyzed. The relationship between SNR and BER is obtained through simulation, which provides a lot of useful data for the specific implementation of the system. (2020-11-12, matlab, 346KB, 下载2次)
[通讯编程] 程序
1、基带码型仿真
（1）通过仿真观察占空比为50%、 75%以及100%的单、
双极性归零码波形以及其功率谱，分析不同占空比对
仿真结果的影响。
（2） 通过仿真产生一随机消息码序列，将其分别转换为
AMI码和HDB3码，观察它们的波形及其功率谱密度。
2、数字带通调制系统仿真
设计一个采用2ASK（ OOK） 调制的数字通信系统：
产生二进制随机数据，并仿真其对应的2ASK调制波形，
分析其频谱。所产生的调制波形加入不同信噪比的白噪声，
选取合适的接收方案，画出系统误码率曲线，并与理论误
码率进行对比。
1.Baseband pattern simulation
2. Simulation of digital band-pass modulation system (2020-01-08, matlab, 5KB, 下载9次)
[通讯编程] DQPSK
(1)建立DQPSK调制和解调 SIMULINK仿真模型，评估其在AWGN信道和瑞利衰落信道下的误码率性能（画出信噪比变化时的误码率曲线）；
(2)基于（1）建立的SIMULINK仿真模型，分别在AWGN信道和瑞利衰落信道下发送一个实际音频文件，在接收端实时播放出来
(1) the DQPSK modulation and demodulation SIMULINK simulation model is established to evaluate the bit error rate performance under the AWGN channel and the Rayleigh fading channel (the bit error rate curve when the signal to noise ratio changes).
(2) based on the (1) established SIMULINK simulation model, a real audio file is sent under the AWGN channel and the Rayleigh fading channel respectively, and it is played on the receiving end in real time. (2018-04-28, matlab, 779KB, 下载23次)
[通讯编程] yy
（1）产生N个服从随机分布的随机数，重复M次运算，总计算量为M*N个点 （2）选定生成矩阵，进行信道编码 （3）进行双极性映射，根据不同信噪比加入高斯噪声（4）判决统计误码率（5）使用最小汉明距离译码并统计误码率（6）绘制星座图和误码率曲线图
(1) N random number random distribution, repeated M times of operation, the total amount of computation for M*N points (2) selected generating matrix and channel encoding (3) of bipolar mapping, according to the ratio of adding Gauss noise of different signal to noise (4) judgment statistical error rate (5) use the small Hamming distance decoding and statistical error rate (6) draw the constellation diagram and bit error rate curve (2017-11-27, matlab, 1KB, 下载6次)
[通讯编程] OLA_OOPSim
Opportunistic Large Array 的MATLAB 模拟器.
Object oriented
Event Based
无线广播
支持OLA
累积Relay重发信号以达到最佳解码效果
节点位置可随机或以网格生成
可控制调变方式
独立节点间无线传输信道模型
可调随机生成信噪比范围
生成显示各节点位置图
生成各节点接收所需OLA副本数量图
生成各节点误码率图
生成各节点HOP-COUNT图
生成各节点成功接收SYMBOL数量图
以main.m打开运行
Opportunistic Large Array Simulator in MATLAB.
Object oriented
Event Based
Wireless broadcast
Support OLA
Accumulate the signal re-transmitted from relay to maximize decoding performance
Position of nodes can be randomly or grid based initialized
Modulation methods can be changed
Independent node-to-node wireless transmission channel model
Randomly generate noise for each channel with limited SNR range
Generate nodes position diagram
Generate nodes diagram for required copies of OLA symbol to decode
Generate nodes diagram for BER
Generate nodes diagram for hop-count
Generate nodes diagram for successful decoded symbols
Run with main.m (2013-08-22, matlab, 20KB, 下载7次)
[通讯编程] OQAM_OFDM_Perfect
本代码介绍了OFDM/OQAM 多径信道下，理想信道估计的系统仿真，给出了不同信噪比下的ber性能。介绍了多载波系统的均衡。
This code describes the OFDM/OQAM multipath channel, system simulation, ideal channel estimation, given the ber performance under different signal to noise ratio. The equilibrium of the multi-carrier system. (2012-06-19, matlab, 3KB, 下载569次)
[通讯编程] OFDM
一个OFDM在加性高斯白噪声信道(AWGN)和多径瑞利衰落信道(MuhipathReyleighFading)下的调制解调模型，simulink建模，仿真信噪比、频谱图、星座图。
A OFDM in additive white gaussian noise (AWGN) channel and multipath Rayleigh fading channel (MuhipathReyleighFading) of demodulation model, simulink modeling, simulation SNR, spectrum diagram, constellation chart.
(2011-12-12, Others, 16KB, 下载226次)
[通讯编程] qdpsk
摘 要: 经过限带滤波后的QDPSK 信号的码元波形可分为稳定区与过渡区, 根据这一特点可以利用DFT 方法来实现信
号的解调和位同步。 在这种数字化解调器中需要设计一个合适的带通滤波器, 以便尽可能地消除信号的旁瓣分量而不影响信号
码元稳定区内的波形。本文介绍了上述带通滤波器的方案选择和基于M at lab 的滤波器参数设计方法, 以及仿真效果。
Abs tra c t: A f ter a band pass f ilter, QDPSK signal′ s symbo l can be divided into steady sect i on and t ransit i on sect i on, so the
demodulat i on and synch ronizat i on fo r th is signal can be realized w ith DFT 1 In such a digital demodulato r, it is i mpo r tant to design a
p roper band pass f ilter to get r id of side beam pow er effect ively and don′ t change the w avefo rm in steady sect i on1 Th is paper
int roduces the scheme select i on, parameter design method and si mulate effect fo r th is f ilter based onM at lab1 (2010-05-24, PDF, 193KB, 下载25次)
[通讯编程] MATLAB
【摘要】采用’()*(+ 通信仿真软件对应用于无线信道中的,-./，0-./，01(’ 的数字通
信方式和主要通信过程的实际情况进行计算机模拟仿真。主要通信过程为抽样、量化、编码、调制解
调、纠错编码等，并给出了几种调制解调的主要特性，为建立实际通信系统提供了基本的依据。
【关键词】移相键控（-./）；正交幅度调制（1(’）；脉码调制（-2’）
【Abstract】 ()*(+ communication simulation software used in wireless channel in ,-./, 0-. /, 01 ( the number of pass
Letter mode and the actual situation of the main communication process by computer simulation. Main communication process as sampling, quantization, coding, modulation solution
Transfer, error correction coding, etc., and gives the main features of several modulation and demodulation, in order to establish the actual communications system provides the basic basis.
Key words (-./) phase shift keying quadrature amplitude modulation (1 ( ) pulse code modulation (-2 ) (2010-01-19, PDF, 270KB, 下载14次)
[通讯编程] SMS
C#版企业短信群发系统，界面专业，采用ACCESS数据库，VS2005环境开发。系统功能：添加联系人、群发邮件、发送记录、常用短信语及管理、系统管理设置等。是公司正在用的群发系统，请不要将程序用于商业用途，仅供学习参考。登录用户名及密码：tsoft/111。
C# version of the Enterprise Short Message System, interface, professional, using ACCESS database, VS2005 environmental development. System functions: Add contacts, mass mail, send the records, common messaging language and management, system management settings. The company is using the bulk system, the program should not be used for commercial purposes, to study for reference purposes only. Logged-on user name and password: tsoft/111. (2009-11-06, C#, 301KB, 下载140次)
[通讯编程] denoise_filterbank
由于自适应滤波器组的频率响应匹配于信号的统计特性,所以能够得到更为有效的信号分解. 文中根据信号的统计特性,按照低通子带能量最大化的原理设计自适应滤波器组. 结合自适应滤波器组和传统的阈值方法,得到一种更为有效的去噪方法. 实验结果表明,与相同长度的标准滤波器相比,新方法得到了更大的信噪比改善.
Adaptive filter banks as a result of the frequency response to match the statistical properties of the signal, it can be more effective decomposition of the signal. According to the statistical properties of signals, in accordance with the low-pass sub-band energy to maximize the principle of the design of adaptive filters. combination of adaptive filter and the traditional threshold methods, to be a more effective de-noising method. The experimental results show that the standard with the same filter length, the new methods to improve signal to noise ratio greater. (2009-07-05, PDF, 55KB, 下载4次)
[通讯编程] ydtx
移动通信基本知识:从通信网的角度看，移动网可以看成是有线通信网的延伸，它由无线和有线两部分组成。无线部分提供用户终端的接入，利用有限的频率资源在空中可靠地传送话音和数据；有线部分完成网络功能，包括交换、用户管理、漫游、鉴权等，构成公众陆地移动通信网PLMN。从陆地移动通信的具体实现形式来分主要有模拟移动通信和数字移动通信这两部种。
Basic knowledge of mobile communications: From the perspective of communication networks, mobile networks can be seen as an extension of wired communication network, which is both wireless and wired components. Part of user terminals to provide wireless access, frequency of use of limited resources in the air and reliable transmission of voice and data wired part of the completion of network functions, including switching, subscriber management, roaming, authentication and so on, constitute a public land mobile communication network PLMN. From land-based mobile communications to the specific forms of the main points have analog and digital mobile communications that two kinds of mobile communication. (2008-09-03, Others, 211KB, 下载13次)
[通讯编程] wangyue4
这是江苏企业通讯协议（联通版本)的一个Release，因为公司业务已经转换到java版本所以，我决定发布EMSP 2.0 C++ 版本的协议部分，因为当时比较仓促，设计的不是很好，但是我想对于刚刚涉及网络开发的人，特别是刚刚涉及短信息业务开发的人应该有所帮助，我所发布的部分只是协议处理部分的内容，不包括网络的处理，网络处理部分很简单，如果使用BCB或者VC的话您可以使用，VCL或者MFC中封装好的Socket组件来使用就可以了，或者您使用Socket API来处理。对于linux和Unix用户，我想您应该知道如何使用Socket了吧:) 本人曾在VC7 ，BCB6,kylix，G++上生成系统，但是不保证您在上述平台上可以正确生成系统。VC6因为对Standard C++支持不足，无法编译本代码。 (2008-03-16, Visual C++, 25KB, 下载5次)
http://www.pudn.com/Download/item/id/417150.html[通讯编程] pc
：首先介绍了DS--UWB系统的的发射与接收模型，然后分析了利用滑动相关法对信道进行估讣，并巾此给出
了不同RAKE接收机RAKE合成权系数选取方案。对接收机采用最大比(MRC)、最小均方误差(MM SE)及带均衡
器的(MRC)合并系数选取的误码性能进行了仿真和对比。结果表明了带均衡器的MRC—RAKE只用较少的分支
就可以达到接收性能明显优于MMSE—RAKE的程度。尤其在信噪比比较大时。这种优势更加明显。
: First of all, the introduction of the DS UWB system model of the launch and reception, and then analyzed using the sliding correlation method for estimation of channel obituary, and towels, this gives the RAKE receiver RAKE synthesis of different weights to select the program. On the receiver using maximal ratio (MRC), minimum mean square error (MM SE) and band equalizer (MRC) combined coefficient selected BER simulation and comparison. The results show that the equalizer with MRC-RAKE only with fewer branches on the receiver performance can be achieved significantly better than MMSE-RAKE level. Particularly in the relatively large signal to noise ratio. This advantage becomes even more evident. (2007-10-30, Others, 1KB, 下载23次)
[通讯编程] oc8051_defines
：首先介绍了DS--UWB系统的的发射与接收模型，然后分析了利用滑动相关法对信道进行估讣，并巾此给出
了不同RAKE接收机RAKE合成权系数选取方案。对接收机采用最大比(MRC)、最小均方误差(MM SE)及带均衡
器的(MRC)合并系数选取的误码性能进行了仿真和对比。结果表明了带均衡器的MRC—RAKE只用较少的分支
就可以达到接收性能明显优于MMSE—RAKE的程度。尤其在信噪比比较大时。这种优势更加明显。
: First of all, the introduction of the DS UWB system model of the launch and reception, and then analyzed using the sliding correlation method for estimation of channel obituary, and towels, this gives the RAKE receiver RAKE synthesis of different weights to select the program. On the receiver using maximal ratio (MRC), minimum mean square error (MM SE) and band equalizer (MRC) combined coefficient selected BER simulation and comparison. The results show that the equalizer with MRC-RAKE only with fewer branches on the receiver performance can be achieved significantly better than MMSE-RAKE level. Particularly in the relatively large signal to noise ratio. This advantage becomes even more evident. (2007-10-30, Others, 4KB, 下载42次)
[通讯编程] fsm8051
：首先介绍了DS--UWB系统的的发射与接收模型，然后分析了利用滑动相关法对信道进行估讣，并巾此给出
了不同RAKE接收机RAKE合成权系数选取方案。对接收机采用最大比(MRC)、最小均方误差(MM SE)及带均衡
器的(MRC)合并系数选取的误码性能进行了仿真和对比。结果表明了带均衡器的MRC—RAKE只用较少的分支
就可以达到接收性能明显优于MMSE—RAKE的程度。尤其在信噪比比较大时。这种优势更加明显。
: First of all, the introduction of the DS UWB system model of the launch and reception, and then analyzed using the sliding correlation method for estimation of channel obituary, and towels, this gives the RAKE receiver RAKE synthesis of different weights to select the program. On the receiver using maximal ratio (MRC), minimum mean square error (MM SE) and band equalizer (MRC) combined coefficient selected BER simulation and comparison. The results show that the equalizer with MRC-RAKE only with fewer branches on the receiver performance can be achieved significantly better than MMSE-RAKE level. Particularly in the relatively large signal to noise ratio. This advantage becomes even more evident. (2007-10-30, Others, 1KB, 下载41次)
[通讯编程] decode
：首先介绍了DS--UWB系统的的发射与接收模型，然后分析了利用滑动相关法对信道进行估讣，并巾此给出
了不同RAKE接收机RAKE合成权系数选取方案。对接收机采用最大比(MRC)、最小均方误差(MM SE)及带均衡
器的(MRC)合并系数选取的误码性能进行了仿真和对比。结果表明了带均衡器的MRC—RAKE只用较少的分支
就可以达到接收性能明显优于MMSE—RAKE的程度。尤其在信噪比比较大时。这种优势更加明显。
: First of all, the introduction of the DS UWB system model of the launch and reception, and then analyzed using the sliding correlation method for estimation of channel obituary, and towels, this gives the RAKE receiver RAKE synthesis of different weights to select the program. On the receiver using maximal ratio (MRC), minimum mean square error (MM SE) and band equalizer (MRC) combined coefficient selected BER simulation and comparison. The results show that the equalizer with MRC-RAKE only with fewer branches on the receiver performance can be achieved significantly better than MMSE-RAKE level. Particularly in the relatively large signal to noise ratio. This advantage becomes even more evident. (2007-10-30, Others, 2KB, 下载38次)
[通讯编程] OFDM-Channel-Estimation-Based-on-Comb-Pilot
基于导频的ＯＦＤＭ系统信到估计的ＭＡＴＬＡＢ源代码，里面有详细的注释说明
Pilot-based OFDM system, the letter to the estimated MATLAB source code, which has detailed notes (2007-09-18, matlab, 3KB, 下载603次)
[通讯编程] ldpc_decoder
采用Log-BP算法的LDPC码译码仿真程序，给出了不同信噪比下误码率和误包率的统计图，用matlab和C（c-mex）程序分别编写，有详细说明和注释。
The use of Log-BP decoding algorithm for LDPC code simulation program is given a different signal to noise ratio and bit error rate under the packet error rate of the statistical map, using matlab and C (c-mex) procedures, respectively, to prepare, has a detailed description and notes . (2007-07-30, matlab, 76KB, 下载448次)