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)
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)
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)
对MIMO信道容量的分析，天线数，信噪比，接收天线等等
In today's world, as an important medium for people to keep in touch with the outside world, modern mobile communication has gradually integrated into people's lives. With the continuous growth of people's communication demand, communication technology is facing development bottlenecks. In particular, there is a serious contradiction between the limitation of frequency band resources and the increasing demand of people. How to improve the utilization rate of frequency band and data transmission rate has become a new trend in the development of communication technology. As an important technology to improve communication capacity, MIMO technology has become an important means to promote the development of current communication technology. (2019-12-15, matlab, 308KB, 下载4次)
4. 试说明卷积编解码的工作原理：
(1) 使用Simulink仿真卷积编码，并用Viterbi译码的方法进行解码，其中的编码、译码全部是自己编写代码(S-Function方式)，不是调用Simulink的已有编码、译码函数。
(2) 请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。
4. Try to explain the working principle of convolutional codec:
(1) Simulink was used to simulate convolutional coding, and Viterbi decoding method was used for decoding. The coding and decoding were all written by oneself (s-function method), rather than calling the existing coding and decoding functions of Simulink.
(2) in the additive white gaussian noise channel, please draw the curve of the relationship between bit signal-to-noise ratio and bit error rate. (2019-01-15, matlab, 6904KB, 下载14次)
信道为瑞利信道，S_D的距离为1米，三跳协作通信系统中S_R、R1_R1、S_D的距离均为1/3米。调制方式为BPSK,信噪比在-15dB-15dB间，接收端合并方式为ERC,迭代次数为1000
The channel is Rayleigh channel, the distance of S_D is 1 m, and the distance of S_R, R1, S_D in three-hop cooperative communication system is 1/3 M. The modulation mode is BPSK, the signal-to-noise ratio is between - 15dB and 15dB, the receiver merge mode is ERC, and the number of iterations is 1000. (2018-08-12, matlab, 15KB, 下载3次)
（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)
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)
Matlab平台下仿真实现2*2, 4*4， 6*6天线Alamouti空时编码的MIMO系统，画出不同信噪比下的性能曲线对比。
2* 2, 4* 4, 6* 6 antenna Alamouti space-time coding MIMO system Matlab simulation platform, draw the comparison of different signal-to-noise ratio performance curve. (2013-04-19, matlab, 9KB, 下载227次)
在闭启键控通信系统中，两个假设下的观察信号模型为：
若两个假设的先验概率相等，且 , ,采用最小平均错误概率准则，试确定判决表达式，并求最小平均错误概率，利用MATLAB软件比较其理论值、仿真值。上述情况中，噪声 是均值为 ，方差为 的高斯噪声，仿真信噪比范围： ，间隔为 。
In the closed Kai keying communication systems, the observed signal model under two assumptions: equal to the a priori probability of two assumptions, and the minimum average error probability criterion, and try to determine the verdict expression and find the minimum average error probability, using MATLAB software to compare the theoretical value, the simulation values. The above case, the noise is the mean and variance of the Gaussian noise, simulation the SNR ranges: interval. (2012-12-21, matlab, 1KB, 下载6次)
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)
本次仿真研究多幅度电平信号误码率与信噪比之间的关系，系统框图如上。假设考虑8幅度电平，则根据流程首先需要用一个随机数发生器产生在(0,1)间的均匀随机数，然后将(0,1)区间均匀划分为(0,0.125)、(0.125,0.25)、(0.25,0.375)、(0.375,0.5)、(0.5,0.625)、(0.625,0.75)、(0.75,0.875)、(0.875,1)这些子区间，并分别对应于一个3bit符号000、001、010、011、100、101、110、111，接着分别映射到-7d、-5d、-3d、-d、d、3d、5d、7d幅度电平上。之后高斯随机数与幅度电平叠加(高斯噪声的方差由输入信噪比控制)，生成随机幅度r。通过与判定门限的比较判定r的符号值，然后与输入符号比较，如果不等则认为此符号传送错误。本实验假定进行10000次信号发送，计算发送错误的比例作为仿真误码率。
另外计算对应不同信噪比情况下理论误码率的值，与上述实验进行对比验证。
The simulation of multi-amplitude level signal bit error rate and the relationship between SNR, the system block diagram above. Assumption consider the magnitude of level 8, then according to the process you first need to use a random number generator in (0,1) uniform random number, then (0,1) interval is divided into uniform (0,0.125), (0.125 , 0.25), (0.25,0.375), (0.375,0.5), (0.5,0.625), (0.625,0.75), (0.75,0.875), (0.875,1) These sub-intervals, and corresponding to a symbol 3bit 000,001,010,011,100,101,110,111, and then are mapped to-7d,-5d,-3d,-d, d, 3d, 5d, 7d on the amplitude level. After the Gaussian random number with the amplitude level overlay (Gaussian noise of variance controlled by the input signal to noise ratio) to generate a random rate r. By comparison with the determined threshold value to determine the sign of r, and then compared with the input symbol, if the range is that this symbol transmission error. This study assumes that the signal sent 10000, send an error (2011-12-12, matlab, 2KB, 下载9次)
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)
一个四用户的扩频通信系统，扩频增益为N=16，采用Walsh码进行直接序列扩频，BPSK调制，无线信道为AWGN信道。在接收端进行解扩，解调，判决，通过仿真得到其中一个用户的误比特率与信噪比的仿真结果。
A four-user spread spectrum communication system for spreading gain N = 16, the use of Walsh codes for direct sequence spread spectrum, BPSK modulation, AWGN channel for the wireless channel. Carried out in the receiver despreading, demodulation, decision, through the simulation to be one of the user' s bit error rate and signal to noise ratio of the simulation results. (2009-05-10, matlab, 2KB, 下载39次)
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)
（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)
系统分别对无线通信中的几种重要的多址接入协议进行了仿真，包括pure-ALOHA,slotted-ALOHA,CSMA以及ISMA，对每种协议的信噪比-误码率关系进行了分析。
Of wireless communications systems are in several important multiple access protocol simulation, including the pure-ALOHA, slotted-ALOHA, CSMA and ISMA, signal to noise ratio of each type of agreement- the relationship between bit error rate are analyzed. (2008-11-22, matlab, 5KB, 下载256次)
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)
各种卷积码、turbo码的迭代解码平台，是一个专门从事迭代算法研究的实验室开发的研究平台。是从事信源编码、信道编码研究人员的很好的既有平台。使用方便简单。
Various convolutional codes, turbo codes iterative decoding platform, is an iterative algorithm specializes in the study developed in the laboratory research platform. Is to engage in source coding, channel coding researchers established a good platform. Simple and easy to use. (2007-08-02, matlab, 2748KB, 下载457次)
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; (2005-04-10, matlab, 58KB, 下载143次)