Description: 使用matlab对基于最小错误率的Bayes分类器进行仿真，编写了相应的程序，分为协方差相等和不相等两种情况，最后画出了三类的分界线-Using matlab to the smallest error rate based on the Bayes classifier to carry out simulation, the preparation of the corresponding procedures, divided into equal covariance and unequal both cases, the final draw of the three types of line Platform: |
Size: 1024 |
Author:liz |
Hits:
Description: 有关最大比合并、等增益合并的增益性能及误码率的描述。-The maximal-ratio combining, equal gain combined gain of performance and bit error rate description. Platform: |
Size: 1024 |
Author:nannan |
Hits:
Description: 仿真程序：首先需要用一个随机发生器产生（0.1）内的均匀随机数，然后再将该序列映射到对应的幅度电平｛Am｝。然后将这个范围再分成4个相等的区间，这些子区间分别对应于4个信号比特的符号00，01，10，11。检测器观察到r=Am+n，并且计算r和4种可能传输的信号幅度之间的距离，它的输出Bm就是相应于最小距离的信号电平。Bm与真正的的传输信号幅度比较，差错计数器用来对检测器产生的差错计数。-Simulation program: first need to use a random generator (0.1) the uniform random number, then the sequence is mapped to the corresponding amplitude level {Am}. Then this range has been divided into four equal intervals, these sub-intervals corresponding to four signal bits of the symbol 00,01,10,11. Detector observed r = Am+ n, and calculate r and 4 possible transmission distance between the signal amplitude, its output corresponding to the minimum distance Bm is the signal level. Bm and the real rate of transmission of the signal comparison, error detection counter is used to generate the error count. Platform: |
Size: 1024 |
Author:在其位 |
Hits:
Description: 该设计采用的是NE5532芯片组成前置放大电路将输入正弦信号放大，实现负载输出功率大于等于5W的要求。通过分立MOS管组成的互补放大电路，增强功率放大和驱动能力，以驱动8Ω负载。功率放大器的输出功率、电源的供给率通过STC89C52单片机的中A/D转换器取样计算，从而得到整机效率，并显示在LCD的显示屏上。采用带阻滤波电路可以有效抑制交流电源对放大器的影响。该系统的设计实现了输出功率范围在10Hz—50KHz，功率大于5W的模拟信号，且误差在5 以内，信号无明显失真。-This design USES is composed NE5532 chip preamplifier circuit will input sine signal amplifier, realize the load power output is equal or greater than 5 W requirements. Through the division of MOS tube complementary amplifier circuit, enhance power amplifier and drive ability to drive eight Ω load. The power amplifier output power, power supply rate through the STC89C52 SCM in the A/D converter sampling calculation, and get the whole machine efficiency, and displayed on the LCD display. The band elimination filter circuit can reduce the ac power to the influence of the amplifier. The design of the system realized the output power range in 10 Hz ac-50 KHz, power is greater than 5 W analog signals, and the error within 5 and the signal no significant distortion. Platform: |
Size: 1024 |
Author:李雄亮 |
Hits:
Description: 训练错误率和交叉验证错误率相等，在样本比较大时，这个结果是可以预期的；训练错误率一般低于测试错误率，但是当样本数据比较少时，实验也出现了意外，样本多的那组测试错误率比样本少的训练错误率还要小；在本实验中，同组数据的交叉验证错误率比独立测试错误率高，这个反常现象是因为样本的原因所致，交叉验证的样本小，而独立测试时所用训练样本数目大，因而出现这种情况。分类线上，fisher准则是一条直线，而贝叶斯分类器实际上是一个类似椭圆的封闭曲线；很明显，贝叶斯分类器比fisher分类器要好。-Training error rate and cross- validation error rates are equal, the larger the sample , this result is to be expected training error rate is generally lower than the test error rate , but when comparing the sample data came from the experiment there was an accident, that more samples group test error rate less than the training sample error rate is smaller In this experiment, the same set of data cross-validation error rate than independent test error rate, this anomaly is because the sample of reasons , cross-validation sample is small,And independent testing large number of training samples used , resulting in this situation.Classification online , fisher criterion is a straight line , while the Bayesian classifier is actually a closed curve similar to elliptical It is clear that the Bayesian classifier is better than the fisher classifier . Platform: |
Size: 8192 |
Author:崔杉 |
Hits:
Description: 该程序计算了接收分集中等增益合并的误码率，并有理论值和仿真值的比较-The program calculates the bit error rate of receive diversity and equal gain combining, and the theoretical values and simulation values Platform: |
Size: 1024 |
Author:颜志强 |
Hits:
Description: （1） 分析QPSK调制、解调原理，并画出其系统框图；
（2） 产生等概率且相互独立的二进制序列，作为待传输的信号，并画出其波形；
（3） 进行8PSK调制，分别画出I、Q两支路信号经过乘法器后的波形以及8PSK调制波形；
（4） 产生均值为0，方差为1的加性高斯随机噪声，画出其时域波形及频谱；
（5） 将加性高斯随机噪声作为传输信道的干扰，画出接收端信号的时域图；
（6） 进行8PSK解调，输出解码序列，画出解调后信号波形；
（7） 计算系统信噪比、传输误码率。-(1) analysis of QPSK modulation, demodulation, and draw the system block diagram (2) have equal probability and independent binary sequence as a signal to be transmitted, and draw the waveform and (3) 8PSK modulation, Draw the I, Q two way signal multiplier waveform and 8PSK modulation waveform (4) to produce zero mean and variance of an additive Gaussian random noise, to draw the time-domain waveform and spectrum ( 5) the additive Gaussian random noise interference as a transmission channel, to draw the time-domain diagram of the receiver signal (6) 8PSK demodulator output decoding sequence, draw the demodulation of the signal waveform computing system (7) signal-to-noise ratio, the transmission bit error rate. Platform: |
Size: 2048 |
Author:张涛 |
Hits:
Description: 完成超宽带信号的发射和接收，接收端采用最大比合并、等增益合并、选择合并，最后比较三者的误比特性能。-The function of this module is to transmit the UWB signal and then receive the UWB signal by means of Maximal Ratio Combining, Equal Gain Combining and Selection Combining respectively. More important we have campared the bit error rate of the three methods. Platform: |
Size: 4096 |
Author:王方秋 |
Hits:
Description: bti error rate of MIMO channel with maximum ratio combining and seclecting cimbining and equal gain Platform: |
Size: 5120 |
Author:hadi |
Hits:
Description: 接受分集中的等增益合并函数，输出误码率和信噪比的关系曲线 -Acceptance of equal gain combining centralized function, the output is bit error rate and SNR curve Platform: |
Size: 3072 |
Author:李光宇 |
Hits:
Description: 本程序仿真了AWGN信道下，采用DS扩频对bpsk信号的影响，扩频码采用walsh码，扩频因子16；
接收端进行rake接收，然后分集合并，比较了三种分集方式对误码率的影响
从图像可以看出在扩频因子较高的情况下，最大比值合并与等增益合并性能相近-This program simulates the AWGN channel, using DS spread spectrum signal for bpsk influence spreading code using walsh code spreading factor 16
Rake receiver receiving end, and diversity combining, diversity compares three methods on the bit error rate of
As can be seen from the image in the case of higher spreading factor, the maximum ratio combining and equal gain combining similar performance Platform: |
Size: 1024 |
Author:liangzhongfa |
Hits:
Description: Previous works have shown that the ear is a promising candidate for biometric identification. However, in prior work, the
preprocessing of ear images has had manual steps and algorithms have not necessarily handled problems caused by hair and
earrings. We present a complete system for ear biometrics, including automated segmentation of the ear in a profile view image and
3D shape matching for recognition. We evaluated this system with the largest experimental study to date in ear biometrics, achieving a
rank-one recognition rate of 97.8 percent for an identification scenario and an equal error rate of 1.2 percent for a verification scenario
on a database of 415 subjects and 1,386 total probes. Platform: |
Size: 247808 |
Author:krish |
Hits:
Description: a Matlab code that produces a plot of probability of bit error rate for QPSK versus SNR for three receive antennas, and three different combining methods: MRC, equal gain combining, and selection combining. The plot is generated by using Monte Carlo simulation. The SNR in this plot is the single-antenna average signal-to-noise ratio, and range from -5 dB to 15 dB. Platform: |
Size: 1024 |
Author:mozhii |
Hits:
Description: AdaBoost元算法属于boosting系统融合方法中最流行的一种，说白了就是一种串行训练并且最后加权累加的系统融合方法。
具体的流程是：每一个训练样例都赋予相同的权重，并且权重满足归一化，经过第一个分类器分类之后，
计算第一个分类器的权重alpha值，并且更新每一个训练样例的权重，然后再进行第二个分类器的训练，相同的方法.......
直到错误率为0或者达到指定的训练轮数，其中最后预测的标签计算是各系统*alpha的加权和，然后sign（预测值）。
可以看出，训练流程是串行的，并且训练样例的权重是一直在变化的，分错的样本的权重不断加大，正确的样本的权重不断减小。
AdaBoost元算法是boosting中流行的一种，还有其他的系统融合的方法，比如bagging方法以及随机森林。
对于非均衡样本的处理，一般可以通过欠抽样(undersampling)或者过抽样(oversampling)，欠抽样是削减样本的数目，
过抽样是重复的选取某些样本，最好的方法是两种进行结合的方法。
同时可以通过删除离决策边界比较远的样例。
-AdaBoost boosting systems dollar fusion algorithm is the most popular one, it plainly systems integration approach is a serial train and final weighted cumulative.
Specific process is: Each training example is given equal weight, and the weights satisfy normalization, after the first classifiers after
Calculating a first classifier weights alpha value for each sample and updates right weight training, and then the second classifier training, the same way .......
0, or until the specified error rate training rounds, wherein the label is the calculation of the final prediction system* alpha weighted and then sign (predicted value).
As can be seen, the training process is serial, and weight training examples is always changing, the right of the wrong sample weight continued to increase, the right to correct sample weight decreasing.
AdaBoost algorithm is an element, as well as other methods of boosting popular systems integration, such as bagging and random forest method.
For Platform: |
Size: 2048 |
Author:iihaozl |
Hits:
Description: CDMA中的分集接收误码率比较，包括最大比合并，等增益合并，选择式合并(Diversity reception error rate in CDMA, including maximum ratio combining, equal gain combining, selective combining) Platform: |
Size: 1024 |
Author:秋刀鱼的夏天
|
Hits:
Description: 论文程序，主要是计算瑞利信道下的等增益的结合器的误码率。是数字通信的入门程序(The procedure of this paper is mainly to calculate the bit error rate of the equal gain combiner in Rayleigh channel. Is the introduction of digital communication procedures) Platform: |
Size: 146432 |
Author:月月鸟_hhuc
|
Hits:
Description: 5. 在三条径的瑞利信道中，对于直接序列扩频：
(1) 请设计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。用Simulink进行仿真，画出比特信噪比与信道估计均方误差的关系曲线和比特信噪比与误码率的关系曲线。
(2) 设频率已经同步，请设计DS-CDMA一种具体的单停顿滑动相关时间同步方法，用Simulink进行仿真，画出比特信噪比与捕获概率的关系曲线。
(3) 设时间已经同步，请设计DS-CDMA一种具体的频率同步方法，用Simulink进行仿真，画出比特信噪比与频率同步误差的关系曲线。(5. In three-path Rayleigh channel, for direct sequence spread spectrum:
(1) please design a specific code division navigation aided channel estimation method for ds-cdma, and adopt equal-beneficial combination and maximum ratio combination for receivers respectively.Simulink is used to simulate and draw the relationship curve between bit SNR and channel estimation mean square error and the relationship curve between bit SNR and bit error rate.
(2) assuming that the frequency has been synchronized, please design a specific single-stop sliding correlation time synchronization method ds-cdma, Simulink simulation, draw the relationship between the bit SNR and the acquisition probability curve.
(3) if the time has been synchronized, please design a specific frequency synchronization method ds-cdma, Simulink simulation, draw the relationship between the bit SNR and frequency synchronization error curve.) Platform: |
Size: 3554304 |
Author:kmdcdy |
Hits:
Description: Objective: Simulate a simple communication system and
estimate bit error rate.
I System Characteristics:
I BPSK modulation, b 2 {1,−1} with equal a priori
probabilities,
I Raised cosine pulses,
I AWGN channel,
I oversampled integrate-and-dump receiver front-end,
I digital matched filter.
I Measure: Bit-error rate as a function of Es/N0 and
oversampling rate. Platform: |
Size: 646893 |
Author:jivisadirov@gmail.com |
Hits:
Search - equal error rate