Description: pcm这段代码首先加载并播放一个声音,然后监听Event.ENTER_FRAME事件,也就是在声音播放时触发onEnterFrame()函数. onEnterFrame()首先调用SoundMixer.computeSpectrum()方法,把波形数据保存在ByteArray对象bytes中.
然后使用矢量绘图API绘制声音的波形.第一个for循环遍历前256个左声道的数据, 并使用Graphics.lineTo()方法从一个点绘到另一个点.第二个for循环遍历接下来的256个右声道的数据,这次以相反的次序绘图,从右到左.最后的波形图可以产生一个有趣的镜像效果.
-pcm this code to load and play the first one voice, and then monitor Event.ENTER_FRAME events, that is, voice playback trigger onEnterFrame () function. onEnterFrame () first call SoundMixer.computeSpectrum () method, the waveform data stored in the ByteArray object in bytes. and then use vector graphics rendering API sound waveform. The first traversal for the cycle 256 before the left channel data, and use Graphics.lineTo () method from one point to another point of painting. The second for the cycle traverse the next 256 right channel data in the opposite order of the drawing, right-to-left. final waveform can produce an interesting image effects. Platform: |
Size: 235520 |
Author:ttttt |
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Description: Program to simulate Rayleigh fading using a p-th order autoregressive model AR(p) according to Baddour s work: "Autoregressive modeling for fading channel simulation", IEEE Transaction on Wireless Communications, July 2005.-Program to simulate Rayleigh fading using a p-th order autoregressive model AR (p) according to Baddour s work: Autoregressive modeling for fading channel simulation , IEEE Transaction on Wireless Communications, July 2005. Platform: |
Size: 1024 |
Author:Feng |
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Description: 基于二阶和高阶统计量的MIMO系统盲信道估计，可完美进行信道估计，进行误码率及误差分析等。-Based on second-order and higher-order statistics of the MIMO system, blind channel estimation can be the perfect channel estimation carried out for the bit error rate and error analysis. Platform: |
Size: 23552 |
Author:张张 |
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Description: 根据图像数字水印基本原理和水印信道的构造及生成方式，从信息论的角度，对基于高斯噪声信道的数字水印容量进行探索。针对高斯信源分布具有最大的不确定性、能够在所有的二阶随机分布中提供最大信息熵的特点，分析在高斯分布情况下的整个水印信道通信过程，并引入平均互信息理论，给出基于高斯的水印信道容量的最大通信速率。同时分析加性噪声信道下的容量问题，将高斯分布扩展到非高斯分布，优化容量计算表达式，利用Matlab软件工具给出非高斯信源水印容量与受限失真度的2D和3D关系仿真曲线，并结合实际给出结果分析。-】Based on the digital watermark and information theory, a rudimental research for the Gaussian watermark capacity is given. Considering that Gaussian distribution has the maximum uncertainty with the maximum entropy among all given second-order distributions, this paper focuses on the watermark communication process with Gaussian channel, and uses the average mutual information to analyze the communication capacity. Also the additive noise channel is introduced to expand the non-Gaussian case. The formula of maximum transmission rate for Gaussian watermark channels is given and simplified, and the 2D and 3D curves for the relationship between the distortion and channel capacity by Matlab are illustrated. It analyses the results at different distortions in two different usages of watermark. Platform: |
Size: 439296 |
Author:li |
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Description: 文章介绍了平坦衰落下的频偏和同步联合恢复技术，能够有效应对时变的信道，并且不需要训练序列，给出了详细的仿真和分析，供大家学习-Two open-loop algorithms are developed for esti-
mating jointly frequency offset and symbol timing of a linearly
modulated waveform transmitted through a frequency-fl at fading
channel. The methods exploit the received signal’s second-order
cyclostationarity and, with respect to existing solutions: 1) they
take into account the presence of time-selective fading effects 2)
they do not need training data 3) they do not rely on the Gaussian
assumption of the complex equivalent low-pass channel process
and 4) they are tolerant to additive stationary noise of any color
or distribution. Platform: |
Size: 535552 |
Author:caiyh |
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Description: Distributed Beamforming for Relay Networks Based on Second-Order Statistics of the Channel Statement Information最小发送功率与最大信噪比的代码，结果与论文中相同，总共9个仿真图-Networks Based on Second-Order Statistics of the Channel Statement Information。Minimum transmit power with maximum signal-to-noise ratio of the code, the same results paper, a total of nine simulation Figure Platform: |
Size: 5120 |
Author:dalianmao |
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Description: 研究了单基站功率约束条件下的多点协作多输入单输出干扰下行链路系统的和速率最大化非凸优化问
题。为有效求解和速率最大化优化问题，首先采用分层优化方法将和速率最大化优化问题分解成发射功率最小
化优化问题和单输入单输出干扰信道的和速率最大化优化问题 其次利用二阶锥规划优化方法求解发射功率最
小化优化问题 然后利用凸近似和几何规划方法求解单输入单输出干扰信道的和速率最大化优化问题 最后通
过交替求解这两个子优化问题，进而提出了一种新颖的单调协同多点波束成形算法 而且利用单有界序列原理
证明了所提算法的收敛性。数值仿真表明所提算法只需约四次迭代即可收敛到稳定点，而且所获得的最优性能
非常接近穷举搜索算法的最优性能。-Single base station power constraints under the multi-point collaboration and the rate of multiple-input single-output interference downlink system to maximize non-convex optimization problem. For maximizing the effective solving and rate optimization problem, first hierarchical optimization method to maximize the rate optimization problem into minimum transmit power optimization problem and the single-input single-output interference channel and rate maximization optimization problem Secondly, the second-order cone programming optimization method for solving the minimum transmit power optimization problem then using convex approximation and geometric programming method for single-input single-output interference channel and maximizing the rate optimization problem Finally, by alternately solving the two sub-optimization problems, and then put forward a novel monotonous collaborative multi-beamforming algorithm and the use of single-, bounded sequence principle that the convergence Platform: |
Size: 684032 |
Author:李腾飞 |
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Description: . 对于基于块状（block-type）导频的信道估计，仿真实现LS， LMMSE modified 和基于SVD的降维LMMSE 算法在多径频率选择性特征的信道上的BER VS SNR 和BER VS Doppler frequency shift 的功能。
2. 对于基于梳状（comb-type）导频的信道估计，实现LS with 1D linear interpolation, LS with second-order interpolation, LS with Spline cubic interpolation.
3. 比较块状和梳妆导频信道估计方法在不同的特征的信道上的性能（channel with fast fading and channel with slow fading）.
4. 信号的调制方式可以选择16QAM或者QPSK
5.对于SVD-LMMSE （optimal rank reduction）, rank的取值P也会的到分析。 Platform: |
Size: 2461 |
Author:xiongsj715@163.com |
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Description: 设计一个2阶加权自适应噪声对消器，对经加性白高斯噪声信道干扰的正弦信号进行滤波。-Design of a second-order weighted adaptive noise cancellation, a sinusoidal signal by additive white Gaussian noise channel interference filter. Platform: |
Size: 1024 |
Author:yhr |
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Description: 在信噪比从0到30dB的范围内产生8PSK，bpsk，qpsk，16qam，64qam信号，通过AWGN信道，并计算信号的高阶累积量和二阶矩，可以用于盲检测-Produce SNR range 0 to 30dB of 8PSK, bpsk, qpsk, 16qam, 64qam signal through AWGN channel, and calculates the signal higher order cumulants and the second moment, can be used to blind detection Platform: |
Size: 5120 |
Author:wuruian |
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Description: Channel estimation techniques for OFDM systems based on a pilot arrangement are investigated. Channel estimation based on a comb type pilot arrangement is studied through different algorithms for both estimating the channel at pilot frequencies and interpolating the channel. Channel estimation at pilot frequencies is based on LS and LMS methods while channel interpolation is done using linear interpolation, second order interpolation, low-pass interpolation, spline cubic interpolation, and time domain interpolation. Time-domain interpolation is obtained by passing to the time domain by means of IDFT (inverse discrete Fourier transform), zero padding and going back to the frequency domain by DFT (discrete Fourier transform). In addition, channel estimation based on a block type pilot arrangement is performed by sending pilots in every sub-channel and using this estimation for a Platform: |
Size: 3072 |
Author:MUHAMMAD SHAKIL |
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Description: 一、无组件，开源。
二、魅力软件坚持系统更新开发，不断完善。内置一键在线升级程序，方便您快速升级到更新，更安全的版。
三、功能强大，经典通用型。功能系统有：公司新闻模块，产品展示模块，定单模块，公司产品（信息）下载模块，留言反馈模块，人才招聘模块，公司自定义频道模块，视频模块...
四、实用插件功能有：在线qq客服系统，网站流量简单统计系统，邮件列表，Sql防注入系统-First, no assembly source.
Second, adhere to the charm of the software update system development, and constantly improve. A built-in key online upgrade program, you can quickly upgrade to a newer, more secure version.
Third, the powerful, versatile classic. System function: Company news module, product display module, order module, the company s products (information) download module Feedback module, the recruitment module, the company custom channel module, video module ...
Fourth, practical plug-in features are: qq online customer service system, a simple Web site traffic statistics system, mailing lists, Sql-injection system ......
Platform: |
Size: 4822016 |
Author:T_toto |
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Description: In this paper, we investigate blind channel estimation for Multiple Input Multiple Output (MIMO) multi-carrier
CDMA (MC-CDMA) systems in the uplink scenario. An Autocorrelation Contribution Matrix (ACM) method is proposed in
comparison with the subspace approach. Using only second order
statistics, the ACM approach shows similar performance to that
of subspace based approach. The added advantage is that it eliminates the need for rank estimation and noise power calculation
as in subspace technique. In particular we incorporate blind
channel estimation with Layered Space Frequency Equalisation
(LSFE),which employs successive interference cancellation and
therefore provides significant performance improvement over the
conventional linear minimum mean square error (MMSE) based
approach. Platform: |
Size: 109568 |
Author:Casper_z
|
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Description: 二手车系统,是目前最专业的二手车系统,具有拍卖,销售，卖车，评估等功能
1、用户管理
对网站前台用户的增加、删除、修改和查询，对用户账户保证金或权限额度的充值、冻结、扣除和解冻。设置网站做过的推广渠道并获取用户注册的来源。
2、车辆管理
展示发布的车辆，配置车辆地区，筛选条件。
3、拍卖管理
对各个状态拍卖的查询编辑（为了安全个别状态不允许进行修改和删除）。和配置拍卖默认的价格浮动，保证金收取方式（也可在具体拍品中进行设置）。
4、订单管理
订单和订单状态的查询和编辑。可配置各种订单的有效期。(The second-hand car system is the most professional second-hand vehicle system at present. It has the functions of auction, sale, car sale, evaluation and so on.
1. User management
Add, delete, modify and query users' front-end users, recharge, freeze, deduct and thaw the user account margin or authority limits. Set up the promotion channel that the website has done, and get the source of user registration.
2. Vehicle management
Display the released vehicle, configure vehicle area and screen conditions.
3. Auction management
Query editing for various status auctions is not allowed to modify or delete for security individual states. And configure the auction default price fluctuation, the way of margin collection can also be set in specific products.
4. Order management
Order and order status query and edit. The validity of various orders can be configured.) Platform: |
Size: 34660352 |
Author:4y5yhe |
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Description: 环路滤波器是通信信号调制解调中最重要的一个部分，环路滤波器设计的好坏将直接影响到接收机的性能指标，二阶锁频辅助三阶锁相环路滤波器可以稳定跟踪具有加加速度的信号源，是现代通信中非常实用的技术，本文中详细编写了单载波信号产生模块、信道噪声模块、数字正交下变频模块、鉴频鉴相模块、环路滤波器模块，并包含了完整的testbench模块，对于初学者非常有用。(Loop filter is the most important part of communication signal modulation and demodulation. The design of loop filter will directly affect the performance index of receiver. The second-order frequency locking assisted third-order phase-locked loop filter can stably track the signal source with acceleration speed, which is a very practical technology in modern communication. In this paper, the single carrier signal generation module and channel noise are written in detail Sound module, digital orthogonal down conversion module, frequency and phase detection module, loop filter module, and contains a complete testbench module, which is very useful for beginners.) Platform: |
Size: 6156288 |
Author:furypie |
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Search - channel second order