Description: 本设计以ATMEL公司生产的AT90S8515作为控制核心，实现输出电流的数字控制，巧妙地利用4通道8位D/A转换芯MAX505转换芯片来完成16位的转换精度，D/A转换芯片输出的电压量经过一个压流变换电路变换成电流量的输出。再通过12位A/D转换芯片MAX197实现输出数据的反馈采集，形成输出电流的闭环控制，以此来达到较高的控制精度。-design ATMEL the company's core AT90S8515 as the control, Implementation of output current digital control, clever use of a 4-channel 8-bit D / A converter chip core MAX505 conversion to complete 16 of conversion accuracy, D / A converter output voltage chip volume flow through a pressure converter transform into CURRENT output. Again through 12-bit A / D converter chip MAX197 feedback output data collection, output current form of closed-loop control, in order to achieve higher accuracy. Platform: |
Size: 122960 |
Author:刘涛 |
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Description: 数字通信系统的设计及其性能和所传输的数字信号的统计特性有关。所谓 加扰技术，就是不增加多余度而扰乱信号，改变数字信号的统计特性，使其近 似于白噪声统计特性的一种技术。这种技术的基础是建立在反馈移位寄存器序 列（伪随机序列）理论之上的。解扰是加扰的逆过程，恢复原始的数字信号。 如果数字信号具有周期性，则信号频谱为离散的谱线，由于电路的非线 性，在多路通信系统中，这些谱线对相邻信道的信号造成串扰。而短周期信号 经过扰码器后，周期序列变长，谱线频率变低，产生的非线性分量落入相邻信
道之外，因此干扰减小。 在有些数字通信设备中，从码元“0”和“1”的交变点提取定时信息，若
传输的数字信号中经常出现长的“1”或“0”游程，将影响位同步的建立和保 持。而扰码器输出的周期序列有足够多的“0”、“1”交变点，能够保证同步 定时信号的提取。
-digital communication system design and performance and the transmission of digital signals on the statistical characteristics. The so-called scrambling technology is not to increase the degree to disrupt redundant signal, digital signal change the statistical properties it is similar to white noise statistical characteristics of a technology. This technology is based on feedback shift register sequences (pseudo-random sequence) of the above theory. Decryption is the reverse of the scrambling process, the restoration of the original digital signal. If the digital signal is cyclical, the signal spectrum of discrete lines, as the nonlinear circuit, in multi-channel communication system, these lines of the adjacent channel signal causing crosstalk. And the short-cycle signal after scrambling Platform: |
Size: 113625 |
Author:葛岭泉 |
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Description: Adaptive Filter. This script shows the BER performance of several types of equalizers in a static channel with a null in the passband. The script constructs and implements a linear equalizer object and a decision feedback equalizer (DFE) object. It also initializes and invokes a maximum likelihood sequence estimation (MLSE) equalizer. The MLSE equalizer is first invoked with perfect channel knowledge, then with a straightforward but imperfect channel estimation technique. Platform: |
Size: 134537 |
Author:zhang |
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Description: 本设计以ATMEL公司生产的AT90S8515作为控制核心，实现输出电流的数字控制，巧妙地利用4通道8位D/A转换芯MAX505转换芯片来完成16位的转换精度，D/A转换芯片输出的电压量经过一个压流变换电路变换成电流量的输出。再通过12位A/D转换芯片MAX197实现输出数据的反馈采集，形成输出电流的闭环控制，以此来达到较高的控制精度。-design ATMEL the company's core AT90S8515 as the control, Implementation of output current digital control, clever use of a 4-channel 8-bit D/A converter chip core MAX505 conversion to complete 16 of conversion accuracy, D/A converter output voltage chip volume flow through a pressure converter transform into CURRENT output. Again through 12-bit A/D converter chip MAX197 feedback output data collection, output current form of closed-loop control, in order to achieve higher accuracy. Platform: |
Size: 122880 |
Author: |
Hits:
Description: 数字通信系统的设计及其性能和所传输的数字信号的统计特性有关。所谓 加扰技术，就是不增加多余度而扰乱信号，改变数字信号的统计特性，使其近 似于白噪声统计特性的一种技术。这种技术的基础是建立在反馈移位寄存器序 列（伪随机序列）理论之上的。解扰是加扰的逆过程，恢复原始的数字信号。 如果数字信号具有周期性，则信号频谱为离散的谱线，由于电路的非线 性，在多路通信系统中，这些谱线对相邻信道的信号造成串扰。而短周期信号 经过扰码器后，周期序列变长，谱线频率变低，产生的非线性分量落入相邻信
道之外，因此干扰减小。 在有些数字通信设备中，从码元“0”和“1”的交变点提取定时信息，若
传输的数字信号中经常出现长的“1”或“0”游程，将影响位同步的建立和保 持。而扰码器输出的周期序列有足够多的“0”、“1”交变点，能够保证同步 定时信号的提取。
-digital communication system design and performance and the transmission of digital signals on the statistical characteristics. The so-called scrambling technology is not to increase the degree to disrupt redundant signal, digital signal change the statistical properties it is similar to white noise statistical characteristics of a technology. This technology is based on feedback shift register sequences (pseudo-random sequence) of the above theory. Decryption is the reverse of the scrambling process, the restoration of the original digital signal. If the digital signal is cyclical, the signal spectrum of discrete lines, as the nonlinear circuit, in multi-channel communication system, these lines of the adjacent channel signal causing crosstalk. And the short-cycle signal after scrambling Platform: |
Size: 113664 |
Author:葛岭泉 |
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Description: 面包括论坛频道、工作室频道、博客频道、音乐频道、BT下载频道、作品展示频道、网站建设频道、空间域名频道等部分提供无功能限制版本免费下载，回馈于一直支持翱翔设计网的所有人的，在此表示感谢-Surface, including the Forum channel, Studio Canal, blog, channel, music channels, BT download channel works display channel, site-building channels, channels such as part of the domain name space to provide non-functional version free download limit, feedback has been supporting in the design of networks for all soar and wish to express my gratitude Platform: |
Size: 9892864 |
Author:郝易 |
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Description: 文章中分析了OFDM系统的频谱利用率，研究了OFDM系统中的信道判决反馈均衡问题-Article analyzes the spectral efficiency of OFDM systems to study the OFDM system channel decision feedback equalizer problem Platform: |
Size: 248832 |
Author:王云峰 |
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Description: 用带反馈通道的移位寄存器产生PRBS序列信号。要选择合适的通道，经模二加法后进行反馈。在程序中，移位寄存器个数可从2到13中任意选择，其长度也可以自由选择。运行结果在vc++的运行环境中能看得很清楚，最后产生的M序列数据也存在相应的数据文件中。-Used with feedback channel shift register sequence generated PRBS signal. Please select the appropriate channels, by mode after 2 adder feedback. In the process, the number of shift register could be from 2-13 in the arbitrary choice, its length can also be free to choose. Results in vc++ The operating environment can be clearly seen, the last M-series data generated there are corresponding data file. Platform: |
Size: 204800 |
Author:李明哲 |
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Description: 书文提出了一种称为平均反馈(AF)的新算法．该算法利用两个相邻的
0FDM符号之间的荧联信息对LS算法的估计结果进行平均和反馈．以减少离斯白噪声岛子信道间干扰(1cI)对信道估计结
果的影囔。-The book article proposed one kind is called the average to feed back (AF) the new algorithm. This algorithm uses two neighboring between the 0FDM mark the glimmer to unite the information to carry on the average and the feedback to the LS algorithm estimate result. Reduces to the Si white noise island sub-letter interference between channels (1cI) pair of channel estimates intends the fruit the shade nang. Platform: |
Size: 316416 |
Author:林悦 |
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Description: In this paper, a novel demodulation structure in
high-frequency (HF) channel is introduced and studied.Frequency-offset estimation, ractionally spaced adaptive equalization and carrier recovery techniques are involved.Frequency-offset correction is carried out based on channel impulse response estimation. ractionally spaced adaptive equalization and carrier recovery are combined with nonlinear decision feedback loop structure and the initial value
of tap coefficients of equalization are obtained from the previous channel estimation. Simulation is conducted under channel parameters with respect to MIL-STD-188-110B using a Monte Carlo technique. The results show this novel demodulation structure is feasible and efficient in HF channel, the symbol error ratio can reach to 10− 3 in 12dB SNR.-In this paper, a novel demodulation structure in
high-frequency (HF) channel is introduced and studied.Frequency-offset estimation, ractionally spaced adaptive equalization and carrier recovery techniques are involved.Frequency-offset correction is carried out based on channel impulse response estimation. ractionally spaced adaptive equalization and carrier recovery are combined with nonlinear decision feedback loop structure and the initial value
of tap coefficients of equalization are obtained from the previous channel estimation. Simulation is conducted under channel parameters with respect to MIL-STD-188-110B using a Monte Carlo technique. The results show this novel demodulation structure is feasible and efficient in HF channel, the symbol error ratio can reach to 10− 3 in 12dB SNR. Platform: |
Size: 186368 |
Author:Lin |
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Description: Deaf people use facial expressions a non-manual channel for conveying grammatical information in sign language. Tracking facial features using the Kanade - Lucas - Tomasi (KLT) algorithm is a simple and effective method toward recognizing these facial expressions, which are performed simultaneously with head motions and hand signs. To make the tracker robust under these conditions, a Bayesian framework was developed as a feedback mechanism to the KLT tracker. This mechanism relies on a set of face shape subspaces learned by Probabilistic Principal Component Analysis. An update scheme was utilized to modify these subspaces and adapt to persons with different face shapes. The result shows that the proposed system can track facial features with large head motions, substantial facial deformations, and temporary face occlusions by hand.-Deaf people use facial expressions as a non-manual channel for conveying grammatical information in sign language. Tracking facial features using the Kanade- Lucas- Tomasi (KLT) algorithm is a simple and effective method toward recognizing these facial expressions, which are performed simultaneously with head motions and hand signs. To make the tracker robust under these conditions, a Bayesian framework was developed as a feedback mechanism to the KLT tracker. This mechanism relies on a set of face shape subspaces learned by Probabilistic Principal Component Analysis. An update scheme was utilized to modify these subspaces and adapt to persons with different face shapes. The result shows that the proposed system can track facial features with large head motions, substantial facial deformations, and temporary face occlusions by hand. Platform: |
Size: 189440 |
Author:Ng Jack |
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Description: OFDM in Multipath Model Matlab:
ofdmVersion4forCForward: It is for forward channel i.e. transmission of data.
ofdmVersion4forCBackward: This is for feedback transmission for sending modulation state for next frame transmission. Platform: |
Size: 36864 |
Author:Mike |
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Description: 本文章主要讲述了基于反馈和LDPC码的窃听信道建模，让大家更好的了解信道编码的知识点-This article mainly tells the story of hacking and LDPC codes based on feedback channel modeling, let people better understand the knowledge of channel coding Platform: |
Size: 238592 |
Author:DengTianyin |
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Description: Massive multiple-input multiple-output technology has been considered a breakthrough in wireless
communication systems. It consists of equipping a base station with a large number of antennas to serve many active
users in the same time–frequency block. Among its underlying advantages is the possibility to focus transmitted signal
energy into very short-range areas, which will provide huge improvements in terms of system capacity. However,
while this new concept renders many interesting benefits, it brings up new challenges that have called the attention of
both industry and academia: channel state information acquisition, channel feedback, instantaneous reciprocity,
statistical reciprocity, architectures, and hardware impairments, just to mention a few. This paper presents an overview
of the basic concepts of massive multiple-input multiple-output, with a focus on the challenges and opportunities,
based on contemporary research. Platform: |
Size: 48128 |
Author:hadjidw |
Hits:
Description: Massive multiple-input multiple-output technology has been considered a breakthrough in wireless
communication systems. It consists of equipping a base station with a large number of antennas to serve many active
users in the same time–frequency block. Among its underlying advantages is the possibility to focus transmitted signal
energy into very short-range areas, which will provide huge improvements in terms of system capacity. However,
while this new concept renders many interesting benefits, it brings up new challenges that have called the attention of
both industry and academia: channel state information acquisition, channel feedback, instantaneous reciprocity,
statistical reciprocity, architectures, and hardware impairments, just to mention a few. This paper presents an overview
of the basic concepts of massive multiple-input multiple-output, with a focus on the challenges and opportunities,
based on contemporary research. Platform: |
Size: 502784 |
Author:hadjidw |
Hits:
Description: Massive multiple-input multiple-output technology has been considered a breakthrough in wireless
communication systems. It consists of equipping a base station with a large number of antennas to serve many active
users in the same time–frequency block. Among its underlying advantages is the possibility to focus transmitted signal
energy into very short-range areas, which will provide huge improvements in terms of system capacity. However,
while this new concept renders many interesting benefits, it brings up new challenges that have called the attention of
both industry and academia: channel state information acquisition, channel feedback, instantaneous reciprocity,
statistical reciprocity, architectures, and hardware impairments, just to mention a few. This paper presents an overview
of the basic concepts of massive multiple-input multiple-output, with a focus on the challenges and opportunities,
based on contemporary research. Platform: |
Size: 1060864 |
Author:hadjidw |
Hits:
Search - channel feedback