Description: 整个软件是MATLAB环境下的控制系统仿真，用户输入控制系统前项通道传递函数和反馈通道传递函数以及性能指标，绘制出校正前开环系统的BODE图，并给出稳定裕量和对应的频率。 判断该用哪种校正装置。给出校正装置的传递函数，在一幅图上显示校正后系统的BODE图。给出校正后系统的性能指标。-The software is the MATLAB environment control system simulation, user input control system before the entry channel transfer function and the feedback channel transfer function and performance indicators, drawing out the correction before the open-loop system of the BODE diagram, and gives a stable margin and the corresponding frequency of . Determine the correct device to use which. Calibration device transfer function is given in a map display system BODE diagram after correction. Corrected performance of the system are given index. Platform: |
Size: 24576 |
Author:李同学 |
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Description: 在FHP3350和FHP3450是低成本，高性能，
电压反馈为视频应用而设计的放大器。
这些三和四放大器仅消耗供应三点六毫安
当前每通道可以驱动双（75？）视频功能
负载，同时提供0.1dB的增益平坦度至30MHz。
消费类视频应用也将受益于低
差分增益0.07％和0.03？差分相位误差。那个
FHP3350提供三种，可以成为一个高投入产出
阻抗禁用状态，以便复用或视频
功耗降到最低。
这些放大器的设计工作从5V（± 2.5V的），以
12V的（± 6V的）用品。的产出范围内摆动，或为1.3V
电源电压适应单一5V电源，视频信号。
FHP3450的FHP3350和设计上的互补性
双极工艺制造。他们提供的全功率带宽为210MHz
和1,100 V /μs的压摆率为± 5V电源电压。那个
高性能，低功率和出色的
视频性能使这些放大器以及在适合使用
许多数字消费类视频设备以及许多
通用高速应用-The FHP3350 and FHP3450 are low cost, high performance,
voltage feedback amplifiers designed for video applications.
These triple and quad amplifiers consume only 3.6mA of supply
current per channel and are capable of driving dual (75?) video
loads while providing 0.1dB of gain flatness to 30MHz.
Consumer video applications will also benefit from their low
0.07 differential gain and 0.03? differential phase errors. The
FHP3350 offers three outputs that can be put into a high
impedance disable state to allow for video multiplexing or
minimize power consumption.
These amplifiers are designed to operate from 5V (±2.5V) to
12V (±6V) supplies. The outputs swing to within 1.3V of either
supply rail to accommodate video signals on a single 5V supply.
The FHP3350 and FHP3450 are designed on a complementary
bipolar process. They provide 210MHz of full power bandwidth
and 1,100V/μs of slew rate at a supply voltage of ±5V. The
combination of high performance, low power, and e Platform: |
Size: 743424 |
Author:wangyuli |
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Description: 快速卡尔曼算法是递推最小二乘算法中的一种, 它的收敛速度比梯度算法快得多,
其计算量又比常规卡尔曼算法少得多, 特别适合于跟踪像电离层这样的快变化时变信道。 本文对
用于自适应均衡的快速卡尔曼算法进行了详细研究。-Fast Kalman algo r ithm is one of recursive least squares algo r ithm s . It has much
faster equalizer convergence than the gradient algo r ithm. Its comp lexity is much less than con2
ver t i onal Kalman algo r ithm. It par t icular ly adap ts to t rack rap id var iat i on of a communicat i on
channel as an i ono sphere . In th is paper fast Kalman algo r ithm app lying to a decisi on feedback e2
qualizer has been exhaust ively researched . Platform: |
Size: 183296 |
Author:张海洋 |
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Description: Example of programming 82C54 timerswith 82C59 interrupt controller This example uses CTC channel 0 to monitor a tachometer type pulse input. The CTC is set to generate an interrupt for every 5 pulses which in the example equals 1 degree of rotation.
For visual feedback, the LED toggles on/off
every 360 degrees. This example was tested
using the WinSystems LBC-586PLUS CPU card and
the PCM-CTC counter/timer card.-Example of programming 82C54 timerswith 82C59 interrupt controller This example uses CTC channel 0 to monitor a tachometer type pulse input. The CTC is set to generate an interrupt for every 5 pulses which in the example equals 1 degree of rotation.
For visual feedback, the LED toggles on/off
every 360 degrees. This example was tested
using the WinSystems LBC-586PLUS CPU card and
the PCM-CTC counter/timer card. Platform: |
Size: 1024 |
Author:mmj |
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Description: Abstract—2×2 unitary precoding based on receiver feedback
is applied alongside spatial multiplexing at the base station in
HSDPA (D-TxAA) when the mobile terminal supports MIMO
transmissios [1]. This precoding will influence achievable sumrate
of the MIMO channel if it influences the Signal-to-
Interference-plus-Noise Ratio (SINR) of streams at the receiver
(RX) output. We propose a set of MIMO HSDPA receivers, all
based upon a LMMSE chip-level matrix filter (equalizer) front
end, and introduce the notion of joint bias for the MIMO chip
equalizer. Statistical properties of the spatial model thus obtained
are exploited to analyze the performance of proposed MIMO
receivers. It is shown that precoding choice depends upon the
MIMO receiver and the extent of its impact depends on the
MIMO RX. Platform: |
Size: 195584 |
Author:ashish |
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Description: 企业网站源码，增加了首页幻灯图片从后台添加的功能 增进了在线反馈系统功能,下拉菜单从后台添加 增设了会员三个等级(普通,高级,VIP),在会员频道下添加会员文章或文件下载,设置浏览权限,以让不同会员阅读文章或下载资料.
比如:企业正式用户可以设置成高级会员,企业员工,或代理商,可以设置成VIP会员,通过会员频道浏览或下载相应的文章资料.增强了单页面管理.增设了三大类单页,可以更换不同的版面.-Corporate website source code, an increase of slide images from the background page to add functionality enhance the online feedback system function, the drop-down menu from the background added the addition of three members of class (ordinary, advanced, VIP), to add members in the Member Channel article or file downloads, set the view permissions to allow different members to read the article or download information. For example: Users can set the official corporate senior members, employees, or agents, can be set to VIP members, viewed or downloaded by members of the corresponding channel article information. enhance the management of a single page. the addition of three main types of single-page, you can switch to a different layout. Platform: |
Size: 5935104 |
Author:阿龙 |
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Description: This document specifies a few extensions to the messages defined in
the Audio-Visual Profile with Feedback (AVPF). They are helpful
primarily in conversational multimedia scenarios where centralized
multipoint functionalities are in use. However, some are also usable
in smaller multicast environments and point-to-point calls.
The extensions discussed are messages related to the ITU-T Rec. H.271
Video Back Channel, Full Intra Request, Temporary Maximum Media
Stream Bit Rate, and Temporal-Spatial Trade-off. Platform: |
Size: 78848 |
Author:歪歪 |
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Description: 读取的身份证信息可保存本地及上传后台服务器。-Video transmission in wireless environments is a challenging task due to loss-prone, time-varying and limitation bandwidth characteristics of wireless
channel. In this paper, a wireless video transmission system with feedback is designed. In order to enhance robust transmission of system, Platform: |
Size: 6648832 |
Author:李雪飞 |
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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。-With a shift register with feedback channel PRBS sequence generated signals. To select the appropriate channel, molded after the second addition of feedback. In the program, the number of shift register 13 can be from 2 to choose, free to choose its length. Operation results in vc++ runtime environment, can see clearly, the final sequence data generated by M also the corresponding data file. Platform: |
Size: 5120 |
Author:chenshan |
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Description: 通过仿真和分析对比SCFDMA的性能和算法。This a very simple baseband simulator for SC-FDMA system. This simulator is
part of the upcoming book “Single Carrier FDMA: A New Air Interface for Long
Term Evolution” (Wiley, Nov. 2008) which I co-authored with professor David J.
Goodman at Polytechnic University.
The purpose of this simulator is to give some concrete idea of how SC-FDMA
system works. It does lack many realistic and sophisticated features such as
channel coding, time-varying fading channel model, soft decision decoding, etc.
Regardless, I am hoping that it will help you understand SC-FDMA which is a
fairly new development in 3GPP LTE.
For information on SC-FDMA, go to SC-FDMA resource website at
http://hgmyung.googlepages.com/scfdma. If you have any question, comment,
or feedback, please visit the SC-FDMA discussion forum at
http://scfdma.freeforums.org/ and leave your comment.-This is a very simple baseband simulator for SC-FDMA system. This simulator is
part of the upcoming book “Single Carrier FDMA: A New Air Interface for Long
Term Evolution” (Wiley, Nov. 2008) which I co-authored with professor David J.
Goodman at Polytechnic University.
The purpose of this simulator is to give some concrete idea of how SC-FDMA
system works. It does lack many realistic and sophisticated features such as
channel coding, time-varying fading channel model, soft decision decoding, etc.
Regardless, I am hoping that it will help you understand SC-FDMA which is a
fairly new development in 3GPP LTE.
For information on SC-FDMA, go to SC-FDMA resource website at
http://hgmyung.googlepages.com/scfdma. If you have any question, comment,
or feedback, please visit the SC-FDMA discussion forum at
http://scfdma.freeforums.org/ and leave your comment. Platform: |
Size: 52224 |
Author:Aaron Yan |
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Description: 给出完整的通信系统和多径通信信道，并使用带RLS算法的判决反馈均衡器进行均衡。
内有详细注释。
在DFE(lms算法）的基础上，采用RLS算法
产生 0 1 序列--> QPSK映射 --> 上变频 --> 信道（多径、加噪）
--> 下变频 --> LMS算法均衡 --> 解映射、判决 --> 求误码率、星座图-This progam include a complete communication system with a multipath channel, based which decision feedback equalization with RLS algrithem is implemented. Platform: |
Size: 2048 |
Author:西电东风 |
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Description: An adaptive transmit diversity scheme with quadrant phase constraining feedback is proposed in this
paper. With simple linear operations at both transmitter and receiver, the proposed algorithm can achieve better
system performances with only 2M − 2 bits of feedback information for systems with M transmit antennas.
Theoretical performance bounds of the proposed transmit diversity scheme are derived. Simulation examples and
theoretical analyses show that the proposed transmit diversity scheme outperforms not only the conventional openloop
transmit diversity techniques, but also some closed-loop transmit diversity techniques with more information
transmitted in the feedback channel.-An adaptive transmit diversity scheme with quadrant phase constraining feedback is proposed in this
paper. With simple linear operations at both transmitter and receiver, the proposed algorithm can achieve better
system performances with only 2M − 2 bits of feedback information for systems with M transmit antennas.
Theoretical performance bounds of the proposed transmit diversity scheme are derived. Simulation examples and
theoretical analyses show that the proposed transmit diversity scheme outperforms not only the conventional openloop
transmit diversity techniques, but also some closed-loop transmit diversity techniques with more information
transmitted in the feedback channel. Platform: |
Size: 222208 |
Author:anna |
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Description: This function implememts Soft Output Viterbi Algorithm in trace back mode
Input:
rec_s: scaled received bits. rec_s(k) = 0.5 * L_c(k) * y(k)
L_c = 4 * a * Es/No, reliability value of the channel
y: received bits
g: encoder generator matrix in binary form, g(1,:) for feedback, g(2,:) for feedforward
L_a: a priori information about the info. bits. Extrinsic info. from the previous
component decoder
ind_dec: index of the component decoder.
=1: component decoder 1 The trellis is terminated to all zero state
=2: component decoder 2 The trellis is not perfectly terminated.
Output:
L_all: log ( P(x=1|y) ) / ( P(x=-1|y) )
Frame size, info. + tail bits- This function implememts Soft Output Viterbi Algorithm in trace back mode
Input:
rec_s: scaled received bits. rec_s(k) = 0.5 * L_c(k) * y(k)
L_c = 4 * a * Es/No, reliability value of the channel
y: received bits
g: encoder generator matrix in binary form, g(1,:) for feedback, g(2,:) for feedforward
L_a: a priori information about the info. bits. Extrinsic info. from the previous
component decoder
ind_dec: index of the component decoder.
=1: component decoder 1 The trellis is terminated to all zero state
=2: component decoder 2 The trellis is not perfectly terminated.
Output:
L_all: log ( P(x=1|y) ) / ( P(x=-1|y) )
Frame size, info. + tail bits Platform: |
Size: 1024 |
Author:yk |
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Description: pear to be accurate enough in case MAC reliability is not used as when packet
drops occurs due to collisions buffer drains and size is decreased. Well known schemes
use a combination of channel utilization and buffer occupancy, as seems to be the most
effective method. Fidelity measurement at the sink is also used but is more slow method,
as end-to-and and processing delay is added at the sink.
Talking for Feedback methods local ones are most frequently used as transient
congestion problems are most usual in wireless sensor networks and quick reaction is
needed in these situations.
Control Methods used in different schemes is the most important part. The u
Platform: |
Size: 136192 |
Author:Shajib |
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Description: We address the problem of downlink multiuser
scheduling in practical wireless networks under a desired fairness
constraint. Wireless networks such as LTE, WiMAX and WiFi
provide partial channel knowledge at the base station/access point
by means of quantized user equipment feedback. Platform: |
Size: 223232 |
Author:gau |
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Description: 控制工具箱与SIMULINK软件应用：系统对象为G(s)=4/s(s+2)
PI补偿器K1(s)=(s+1)/s K2(s)=(s+0.5)/s
a 若由K1(s)与 G(s)串联组成的单位反馈系统，称为系统A。
b 若由K1(s) 放置在G(s)的反馈通道称为系统B。
c 若由K2(s)与G(s)串联组成的单位称为系统C，绘制上述每一种情况的阶跃响应与斜坡响应，求每一种情况下的系统阶跃响应误差与斜坡响应误差，并与理论分析结果进行比较。
-Control toolbox and SIMULINK software application: system object for G (s) = 4/s (s+ 2)
PI compensator K1 (s) = (s+ 1)/s K2 (s) = (s+ 0.5)/s
If a by K1 (s) and G (s) series of feedback system of the unit, known as a system a.
B if the K1 (s) placed in G (s) feedback channel called system b.
If c by K2 (s) and G (s) series of unit is called system c, draw the above each kind of condition of step response and slope response, for each of these cases system step response error and slope response error, and the results were compared with theoretical analysis. Platform: |
Size: 128000 |
Author:王丽丽 |
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Search - channel feedback