用MATLAB产生一个频率为1Hz，功率为1的余弦信源，载波频率为10Hz，显示信号的波形及包络，求出调制信号的功率谱密度，以及相干解调后的信号波形
A cosine source with 1 Hz frequency and 1 power is generated by using MATLAB. The carrier frequency is 10 Hz. The waveform and envelope of the signal are displayed. The power spectral density of the modulated signal and the waveform of the coherent demodulated signal are obtained. (2019-01-22, matlab, 1KB, 下载2次)
8. 单径瑞利信道中的四发四收V-BLAST：
(1) 请设计一种具体的导引辅助的信道估计方法，用Simulink进行仿真，测量16QAM调制时的误码率性能。画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线。
(2) 计算所设计方案的频谱效率是多少，单位为bit/Hz/s。
8. Four transmit four receive v-blast in single-path Rayleigh channel:
(1) please design a specific navigation-assisted channel estimation method and conduct simulation with Simulink to measure the bit error rate performance of 16QAM modulation.The relation curve between the bit signal-noise ratio and the mean square error of channel estimation is drawn, and the relation curve between the bit signal-noise ratio and the bit error rate is drawn.
(2) calculate the spectral efficiency of the designed scheme in bit/Hz/s. (2019-01-15, matlab, 435KB, 下载13次)
3. 瑞利信道中的调制解调、信道估计：
(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，并与理论误码率曲线进行对比。
3. Modulation demodulation and channel estimation in Rayleigh channel:
(1) deduce the theoretical bit error rate performance of BPSK coherent demodulation in single-path Rayleigh channel, and draw the relationship curve between bit signal-to-noise ratio and bit error rate.
(2) in single-path Rayleigh channel, please design a time-division guidance assisted channel estimation method, Simulink simulation, measure the bit error rate performance of BPSK, draw the relationship curve between bit SNR and bit error rate, and compare with the theoretical bit error rate curve. (2019-01-15, matlab, 161KB, 下载10次)
在相同的多普勒频移条件下，随着信噪比增加，各方法的均方误差均有所改善，新方法改善更明显且均方误差性能最优，表明对抗信道噪声能力更强。
The simulation results show this new method has a better channel estimation than the existing methods. Under the same SNR condition, with the increasing of doppler shift, the MSE of new method is optimal. Under the same Doppler shift condition (2018-05-04, Visual C++, 245KB, 下载0次)
实现matlab下2ASK通过高斯白信道采用相干解调 的符号信噪比/误符号率/误比特率计算 。以及调制后波形的显示，包括2FSK仿真误码率','2FSK理论误码率图形。
Calculation of symbol signal-to-noise ratio / symbol error rate / bit error rate of 2ASK through coherent demodulation in white channel under matlab. And modulation waveform display, including 2FSK simulation error rate ','2FSK theory bit error rate graphics. (2017-10-16, matlab, 1KB, 下载12次)
论文总结了CDMA通信系统功率控制的目的和方法，重点介绍了基于信噪比的功率控制算法，最后利用
MATLAB工具，对开闭环结合的功率控制方法进行了仿真，给出了实验结果。
The paper summarized the objection and method of CDMA power control，described the algorithm based on SIR．
Finally，the paper gives asimulation in open—loop and closed—loop control． (2013-06-10, Others, 194KB, 下载17次)
主要介绍空中接口物理链路层的无线技术，共分三个部分，首先对主要接口和协议作
简单介绍和描述；然后分别介绍信道与帧；无线信道编码与交织以及LAPDm。
Mainly introduces Wireless technology of air interface in the physical link layer which is divided into three parts. first: a brief introduction and description of the main interfaces and protocols then:Road and frame and last radio channel coding and interleaving and LAPDm . (2013-05-07, Others, 349KB, 下载4次)
OFDM信道估计仿真，运行时需要手动输入其循环前缀长度、最大多径时延扩展、最大多径时延扩展系数和信噪比
Simulation of OFDM channel estimation, the need to manually enter the cyclic prefix length, maximum multipath time delay, the maximum multipath delay spread coefficient and signal-to-noise ratio operation (2013-05-04, matlab, 7KB, 下载39次)
文档中介绍首先介绍了多用户MIMO模型，以及LTE中的多用户MIMO方案，通过仿真分析总结出当用户数较少时，在高信噪比条件下，ZF方案的系统吞吐量性能明显优于PU2RC方案。
Document describes first introduced a model of a multi-user MIMO, and LTE multi-user MIMO scheme, by simulation analysis summed up when the number of users is small, at high SNR conditions, the system throughput performance of the ZF program superior PU2RC program. (2013-01-16, matlab, 352KB, 下载179次)
在多用户M IMO系统中, 基于信漏噪比( SLNR)的预编码由于同时消除了共信道干扰( CC I) 和噪声而提高
了系统性能。
In multi-user M IMO system, based on the letter to noise ratio (SLNR) leakage of precoding because while eliminating cochannel interferences (CC I) and noise and improve
The system performance.
(2012-07-02, matlab, 1KB, 下载125次)
这是一个基于system view的数字基带传输系统。构造了数字基带的系统模型，可以分析数字信源的频谱特性，还可以观察输出信号的眼图
This is the one based on the system. View digital baseband transmission system. Digital baseband system model is constructed to analyze the spectral characteristics of the digital source, you can also observe the eye diagram of the output signal
(2012-05-10, Others, 13KB, 下载5次)
针对多输入多输出空间相关信道环境,提出了一种基于格规约理论的最小均方误差检测算法.该算法考虑了空间相关性的影响,利用复数Lenstra-Lenstra-Lovász格规约算法克服了传统的线性最小均方误差检测器分集阶数随相关系数增加而减小的缺点,使检测到的信号在高信噪比下可以达到比传统算法低个数量级的误码率.理论分析与仿真结果表明,在信道为Kronecker相关平坦衰落模型下,接收端采用最小均方误差信道估计,发射端采用QPSK调制未使用信道编码,当比特信噪比大于18dB时,基于格规约理论的最小均方误差检测器的误码率低于传统最小均方误差检测器的误码率 发射端采用(2,1,3)卷积码、接收端采用硬判决Viterbi译码,当信噪比大于16dB时,基于格规约理论的最小均方误差检测器的误码率低于传统最小均方误差检测器的误码率,且基于格规约理论的最小均方误差检测器的分集阶数不受相关系数的影响,等于接收天线数N.
Toovercomethedrawbackthatthediversityorderofthetraditionallinear MMSEdetection
algorithmdecreaseswiththeincreaseofthecorrelationcoefficient,alattice-reduction-aidedMMSE(LRAMMSE)
detectionalgorithmisproposedforspatialcorrelatedMIMOchannels.TheLRA-MMSEdetection
algorithmconsiderstheeffectofspatialcorrelationinthealgorithm designandtakesadvantageofthe
complexLenstra-Lenstra-Lovász(LLL)algorithmsothatitsBER(biterrorrate)isseveralordersof
magnitudesmallerthanthatofthetraditionallinearMMSEdetectionatahighSNR(signaltonoiseratio).
Theoreticalanalysisandsimulationresultsshowthatwith QPSK modulationandthe MMSEchannel
estimatoratthereceiver,theuncodedBERoftheLRA-MMSEdetectorislowerthanthatofthetraditional
linearMMSEdetectorifthebitSNR(Eb/N0)isgreaterthan18dB,whilethecodedBERoftheLRAMMSEdetectorislowerthanthatofthetraditionallinearMMSEdetectorifEb/
N0isgreaterthan16dB
when(2,1,3)convolutionalchannelcodingandViterbidecodingareadoptedundertheKroneckercorrelated
flatfadingchannel.Furthermo (2012-03-22, PDF, 600KB, 下载46次)
一个非常完整的数字基带传输系统实现，包括信源产生，信道编码，交织，星座映射和基带成型，包括了完整的接收机设计，能够在此基础上做各种仿真，注释丰富，接口完善，极易扩展。
A very complete digital baseband transmission system implementation, including source generation, channel coding, interleaving, constellation mapping and baseband shaping, including a complete receiver design, this can be done on the basis of the simulation, rich annotation, interface perfect, easy to expand.
(2011-12-07, matlab, 103KB, 下载24次)
用Matlab进行BPSK系统发送、接收端的仿真，含有发送端、AWGN信道、匹配滤波、下采样、解调、计算不同信噪比下的误码率，并绘制BER曲线
Matlab simulation of BPSK receiving system，including AWGN channel, match filter, down sample,demodulation and BER calculation (2010-01-25, matlab, 9KB, 下载77次)
Spark是一个开源，跨平台IM客户端。它的特性支持集组聊天，电话集成和强大安全性能。
如果企业内部部署IM使用Openfire+Spark是最佳的组合。
Spark is an open-source, cross-platform IM client. It features support the set of group chat, telephony integration and strong security features. If the deployment of IM use within the enterprise Openfire+ Spark is the best combination. (2010-01-12, PHP, 630KB, 下载27次)
索尼爱立信在纽约的Web2.0会议上提供了其移动产品的WebSDK测试版本，这个工具包主要用于创建Android和Symbian智能手机上的应用，例如即将发布的X10和Satio。
Sony Ericsson' s Web2.0 conference in New York has provided its mobile products WebSDK test version, this kit is mainly used to create Android, and Symbian smart phone applications, such as the forthcoming release of X10 and Satio. (2009-12-03, Java, 819KB, 下载9次)
利用卷积编码和BPSK调制方式，关于高斯白噪声信道下信噪比与比特误码率关系的Simulink仿真
The use of convolutional coding and BPSK modulation on the Gaussian white noise channel ,the relationship between SNR and bit error rate using Simulink simulation (2009-09-25, matlab, 8KB, 下载77次)
手机基本原理: ETACS、GSM蜂窝手机是一个工作在双工状态下的收发信机。一部移动电话包括无线接收机(Receiver)、发射机(Transmitter)、控制模块(Controller)及人机界面部分(Interface)和电源(Power Supply)。
The basic principles of mobile phones: ETACS, GSM cellular phone is a work in the duplex state of the transceiver. A mobile phone, including wireless receiver (Receiver), the transmitter (Transmitter), control module (Controller) and the part of man-machine interface (Interface) and power (Power Supply). (2008-11-25, Others, 1619KB, 下载13次)
尽管频率合成技术已经经历了大半个世纪的发展史，但直到今天，人们对 它的研究仍然在继续。现在，我们可以开发出输出频率高达IG的DDS系统， 武汉理工大学硕士学位论文 已能满足绝大多数频率源的要求，集成DDS产品的信噪比也可达到75dB以上， 已达到锁相频率合成的一般水平。电子技术的发展己进入数字时代，模拟信号 数字化的方法也是目前一个热门研究课题，高速AD、DA器件在通信、广播电 视等领域的应用越来越广泛。本次设计完成了软件仿真和硬件实现，对设计原 理和设计结果进行了一定的理论分析，在一定的频率范围内设计结果与理论值 基本符号，达到了设计指标的要求。限于本人的水平和实现条件，此次设计在 频率稳定度、最高输出频率、降低杂散等方面仍有改进的空间，今后还需进一 步提高。 (2008-06-01, VHDL, 149KB, 下载12次)
http://www.pudn.com/Download/item/id/479222.html
蓝牙技术可谓风风火火、风光无限。自1998年蓝牙技术问世至今，短短的两三年时间，蓝牙获得了来自两千多家企业的响应，并引起了公众的广泛关注。
USSR and the scenery unlimited. Since 1998, the advent of Bluetooth technology has, in 23 short time, Bluetooth access to the more than 2,000 enterprises from the response, and aroused extensive public concern. (2007-03-26, C++ Builder, 109KB, 下载65次)