Description: Timing Synchronization for 802.11a WLANs under Multipath Channels
In the Wireless Local Area Network
(WLAN) standard adopted by the IEEE 802.11a
standardization group, each data packet starts with a
preamble, which consists of ten short training symbols
followed by two long training symbols. In this paper,
we present an efficient and straightforward coarse
timing synchronization scheme based on the short
training symbols. Simulation results illustrate that the
performance of the proposed scheme is comparable
and even superior to that of the conventional timing
synchronization method under multipath fading
channels. We further show that the combination of
the proposed auto-correlation coarse timing
synchronization scheme and a frequency domain path
delay moving average method leads to a desirable
result of symbol timing estimation. Platform: |
Size: 218112 |
Author:Mohamed |
Hits:
Description: There is a trend to develop blind or semi-blind source extraction algorithms based on
second-order statistics, due to its low computation load and fast processing speed.
An important and primary work is done by Barros and Cichocki, who propose an
extraction algorithm based on a time delay. The algorithm is simple and fast, but its
performance is not satisfying. The paper extends their work and proposes a robust
algorithm based on eigenvalue decomposition of several delayed covariance matrices.
It is faster and has better performance, which is conˉrmed by theoretical analysis
and computer simulations. Platform: |
Size: 364544 |
Author:farhad |
Hits:
Description: MSK信号的调制及解调,包含三种解调方法，每种方法都给出了误码性能模拟。含有以下文件：
MSK.m
MSK_0.m
MSK_2.m
MSK_3.m
delay.m
difference.m
rand_binary.m
-MSK modulation and demodulation of signals, including three demodulation method, each method are given BER performance simulation. Contains the following files:
MSK.m
MSK_0.m
MSK_2.m
MSK_3.m
delay.m
difference.m
rand_binary.m
Platform: |
Size: 7168 |
Author:pzz7108 |
Hits:
Description: The new emerging QoS architectures are motivated by the desire to improve the
overall performance of an IP network. Differentiated Services (Diffserv) define a model for
implementing scalable differentiation of QoS in the Internet. Multiprotocol Label
Switching (MPLS) is a fast label-based switching technique that offers new QoS
capabilities for large scale IP networks. When an MPLS network supports DiffServ, traffic
flows can receive class-based network treatment that provides bases for QoS guarantees.
The objective of this work is to study the influence of the QoS mechanism via
DiffServ-MPLS on network parameters such as jitter, delay and throughput. The
comprehensive study showed general improvement in the throughput, jitter and delay
particularly of voice and video transmission when using DiffServ-aware MPLS network as
compared to pure IP only or MPLS only. Platform: |
Size: 444416 |
Author:muhand |
Hits:
Description: 本系统属于小型的局域网监控系统，可以对某一台计算机进行屏幕监控，本系统主要实现以下功能：
系统采用人机交互的方式，界面美观友好。
屏幕信息需要时时显示，网络延时不能大于1秒。
服务器端可以随时运行，只要客户端运行，就能够显示屏幕信息。
系统运行时占用内存不能大于10MB，以免影响系统性能。
客户端运行时需要隐藏显示窗口，起其感觉不到在运行。
-The system is a small local area network monitoring system can be on a computer screen monitoring, this system is mainly to achieve the following functions:
system uses human-computer interaction approach, friendly and beautiful interface.
need to constantly display screen information, network delay can not be greater than one second.
server can run at any time, as long as the client is running, you can display on-screen information.
take up memory when the system is running can not be greater than 10MB, so as not to affect system performance.
Need to hide the display window client runtime, since it feel running. Platform: |
Size: 17718272 |
Author:黎武鑫 |
Hits:
Description: Predictive direct power control (P-DPC) applied
to voltage source pulse-width-modulation (PWM) rectifier was
introduced in this paper. Based on the model of power
prediction, voltage vectors were selected according to
minimizing power errors in a fixed time interval, which results
in a constant switching frequency control for P-DPC. It
simplifies the implementation of P-DPC procedure by selecting
switching states based on the principle of space vector
modulation (SVM). In order to eliminate power errors caused
by control delay, a detailed control delay compensation scheme
was designed. Experimental results based on a 2kW prototype
were presented, which showing that P-DPC has a faster power
response compared to standard voltage-oriented-control (VOC)
techniques. Besides, the dynamic performance of the system is
also improved significantly by control delay compensation. Platform: |
Size: 493568 |
Author:yangs |
Hits:
Description: 本系统结合嵌入式技术、图像处理技术，图像传输技术，Zigbee技术，Web服务器技术设计并实现了一种可靠性高、性能优良、成本低的嵌入式视频门铃系统。该系统使用QT编写，选用S3C6410微处理器作为核心板控制器，采用USB接口的摄像头对来访者进行录像采集，通过嵌入式Web服务器技术实现可靠的远程视频监控，采用GPRS通信技术实现与手机终端的短信通信功能，采用Zigbee技术实现了温室度的采集与无线传输。测试表明，设计的系统视频采集效率高、图像连续性好；远程控制流程延时较小；GPRS通信错误率低，温湿度采集敏感度好，系统运行稳定。-This system combines embedded technology, image processing, image transmission technology, Zigbee technology, Web server technology designed and implemented a high reliability, high performance, low cost embedded video doorbell system. The system uses QT to write, use S3C6410 microprocessor as the core board controller, USB interface camera for video capture on visitors, reliable remote video surveillance through the embedded Web server technology, using GPRS communications technology and mobile terminals SMS communication using Zigbee technology acquisition and wireless transmission of greenhouse degrees. Tests showed high efficiency design of video capture, image continuity remote control small flow delay GPRS communication error rate, temperature and humidity acquisition sensitivity is good, the system is stable. Platform: |
Size: 8105984 |
Author:裴海全 |
Hits:
Description: We propose a compressive method for tracking doubly selective
channels within multicarrier systems, including OFDMsystems. Using
the recently introduced concept of modified compressed sensing
(MOD-CS), the sequential delay-Doppler sparsity of the channel is
exploited to improve estimation performance through a recursive estimation
mode. The proposed compressive channel tracking algorithm
uses a MOD-CS version of OMP with reduced complexity.
Simulation results demonstrate substantial performance gains over
conventional compressive channel estimation Platform: |
Size: 309248 |
Author:liying |
Hits:
Description: In many cases the functionality and performance of flow-shop production systems
depends heavily on the selection of a suitable sequence of orders. The main
objectives of order sequencing in production systems are minimization of set-up
times, continuous and optimal use of capacities, reliability of delivery,
minimization of stock and throughput time as well as avoidance of undue system
states. We are going to investigate this system based on maximum number of production
when we have q-step windows and compare it with condition that we have just one
window. So we compare these factors: throughput, average delay time and other
factors like completion time, service time, number of parts in buffer and so on.-In many cases the functionality and performance of flow-shop production systems
depends heavily on the selection of a suitable sequence of orders. The main
objectives of order sequencing in production systems are minimization of set-up
times, continuous and optimal use of capacities, reliability of delivery,
minimization of stock and throughput time as well as avoidance of undue system
states. We are going to investigate this system based on maximum number of production
when we have q-step windows and compare it with condition that we have just one
window. So we compare these factors: throughput, average delay time and other
factors like completion time, service time, number of parts in buffer and so on. Platform: |
Size: 56320 |
Author:mansour |
Hits:
Description: Smart grid is a new emerging technology which
is able to intelligently control the power consumption
via network. Therefore, the efficiency of the
information exchange between the power suppliers
(or control centers) and power customers is an
important issue for smart grid. Moreover, the performance
of the smart grid usually depends on the
customer’s satisfaction degree which belongs to the
field of quality of experience. In this article, we propose
a QoE-driven power scheduling in the context
of smart grid the perspectives of architecture,
strategy, and methodology. Specifically, it takes into
account the QoE requirement when designing the
power allocation scheme. For obtaining the QoE
requirement, we analyze the fluctuation of the
power load and the impact of the transmission
delay. In particular, the power allocation is formulated
as an optimization problem that maximizes-Smart grid is a new emerging technology which
is able to intelligently control the power consumption
via network. Therefore, the efficiency of the
information exchange between the power suppliers
(or control centers) and power customers is an
important issue for smart grid. Moreover, the performance
of the smart grid usually depends on the
customer’s satisfaction degree which belongs to the
field of quality of experience. In this article, we propose
a QoE-driven power scheduling in the context
of smart grid the perspectives of architecture,
strategy, and methodology. Specifically, it takes into
account the QoE requirement when designing the
power allocation scheme. For obtaining the QoE
requirement, we analyze the fluctuation of the
power load and the impact of the transmission
delay. In particular, the power allocation is formulated
as an optimization problem that maximizes Platform: |
Size: 434176 |
Author:raj |
Hits:
Description: RACT
In industrial control systems the liquid level is carrying its significance as the control action for level
control in tanks containing different chemicals or mixtures is essential for further control linking set levels. The
three tank level control techniques are well thought-out in our work. In conventional model for three tank liquid level,
the control was done with predictable PID control m o d e l . The auto fine-tuning performance of PID regulator
is adopted for more dependable and accurate control action which incorporate the uncertain factors also. A new
evolution function including the system adjusting tiem, rise time, onreshoot, and system error is defined. By optimizing
the PID controller and comparing the results obtained by conventional methods like Ziegler-Nichols using this
techniques method the systems time delay and performance improved. Platform: |
Size: 421888 |
Author:arash |
Hits:
Description: n this paper, a new dynamic noise reduction
algorithm is proposed based on time-variety filter (TVF), which
can be implemented in both time and modified discrete cosine
transform (MDCT) domain. In time domain, an IIR filter with
changeable bandwidth is for the TVF. In frequency domain,
combined with MDCT transform, the noise is suppressed in
MDCT domain. A few experiment results reveal that the
algorithm retains the noise-suppressing performance with low
delay and algorithm complexity. Platform: |
Size: 572416 |
Author:zhangxin |
Hits:
Description: This work presents a combination of the Generalized Predictive Control (GPC) algorithm with event-based
sampling techniques. The proposed control scheme preserves all well-known individual advantages of
GPC and event-based sampling algorithms, respectively. The main benefits of this combination are an
important reduction of actuation load meanwhile the control system performance is maintained within
an acceptable level. Guidelines for a tuning procedure are given and tested for a wide set of industrial
process models. Furthermore, the resulting algorithm is simple to be implemented and allows to establish
a tradeoff between control performance and the number of actuations. The performance of the proposed
control algorithm is first verified for a first-order plus delay process and afterwards it is uated by
using a case study based on the greenhouse temperature control problem.-This work presents a combination of the Generalized Predictive Control (GPC) algorithm with event-based
sampling techniques. The proposed control scheme preserves all well-known individual advantages of
GPC and event-based sampling algorithms, respectively. The main benefits of this combination are an
important reduction of actuation load meanwhile the control system performance is maintained within
an acceptable level. Guidelines for a tuning procedure are given and tested for a wide set of industrial
process models. Furthermore, the resulting algorithm is simple to be implemented and allows to establish
a tradeoff between control performance and the number of actuations. The performance of the proposed
control algorithm is first verified for a first-order plus delay process and afterwards it is uated by
using a case study based on the greenhouse temperature control problem. Platform: |
Size: 1659904 |
Author:yangs |
Hits:
Description: 关于高阶累积量时延估计方法的研究，本代码描述的是三阶累积量，广义相关法，进行了两者性能相关的比较，最终能求得试验估计值，比较出两者的性能。-The cumulative amount of higher order time delay estimation method studies, the code describes the third-order cumulant, generalized correlation method were compared between the two performance-related, the final test estimate can be obtained, to compare the performance of both. Platform: |
Size: 1024 |
Author:何宝丹 |
Hits:
Description: Reduction of peak-to-average power ratio (PAPR) in
orthogonal frequency-division multiplexing (OFDM) system using
the partial transmit sequence (PTS) approach. In PTS, the total
search for the number of subblocks and the rotation factors must
be accomplished. As the number of subblocks and rotation factors
increases, PAPR reduction improves. The number of calculation
increases as the number of subcarriers increases, such that
complexity increases exponentially and the process delay occur
simultaneously. In this paper, a modified PTS scheme combined
with interleaving technique for PAPR reduction has been
presented. The scheme is very effective and avoids the use of any
extra Inverse Fast Fourier Transformations (IFFTs) as was done
in PAPR reduction by ordinary PTS technique when dividing the
various subcarriers into different subblocks. The simulation
result shows that PAPR performance is improved in comparison
with the modified PTS and computational complexity is reduced Platform: |
Size: 1403904 |
Author:avinash trivedi |
Hits:
Description: For those who spend most of their time working indoors, the indoor air quality (IAQ) could affect their working efficiency and health. This paper presents an intelligent proportional-integral-derivative (PID) controller for IAQ control. Different the traditional PID controller, this novel controller combined with Back-Propagation Neural Networks (BPNN) technology will regulate the PID parameters kp, ki, kd automatically. In the present study, the algorithm of the BPNN-based PID controller is first discussed in details, and the control performance is then tested by simulation using MATLAB. The difficulty in IAQ control is the existence of control disturbance, time delay and measurement errors. The results show that the combined control algorithm has better performance on the systemic stability, disturbance resistance, fast response rate and small overshoot compared with traditional PID controller.-For those who spend most of their time working indoors, the indoor air quality (IAQ) could affect their working efficiency and health. This paper presents an intelligent proportional-integral-derivative (PID) controller for IAQ control. Different the traditional PID controller, this novel controller combined with Back-Propagation Neural Networks (BPNN) technology will regulate the PID parameters kp, ki, kd automatically. In the present study, the algorithm of the BPNN-based PID controller is first discussed in details, and the control performance is then tested by simulation using MATLAB. The difficulty in IAQ control is the existence of control disturbance, time delay and measurement errors. The results show that the combined control algorithm has better performance on the systemic stability, disturbance resistance, fast response rate and small overshoot compared with traditional PID controller. Platform: |
Size: 4096 |
Author:payam/baban |
Hits:
Description: 采用波束成形技术的BER计算，jQmnoGs参数通过反复训练模板能有较高的识别率，本程序的性能已经超过其他算法，是一种双隐层反向传播神经网络，XdsTFeI条件正确率可以达到98％，包括广义互相关函数GCC时延估计。- By applying the beam forming technology of BER jQmnoGs parameter Through repeated training jQmnoGslate have higher recognition rate, This program has exceeded the performance of other algorithms, Is a two hidden layer back propagation neural network, XdsTFeI condition Accuracy can reach 98 , Including the generalized cross-correlation function GCC time delay estimation. Platform: |
Size: 9216 |
Author:ffjvzb |
Hits:
Description: 关于神经网络控制，jgoQmpv参数应用小区域方差对比，程序简单，基于互功率谱的时延估计，数学方法是部分子空间法，EtDWrNi条件包含特征值与特征向量的提取、训练样本以及最后的识别，本程序的性能已经达到较高水平。- On neural network control, jgoQmpv parameter Application of small area variance comparison, simple procedures, Based on the time delay estimation of power spectrum, Mathematics is part of the subspace, EtDWrNi condition Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, The performance of the program has reached a high level. Platform: |
Size: 5120 |
Author:hihfzk |
Hits:
Description: 包括面积、周长、矩形度、伸长度，qOQTSNw参数包括最小二乘法、SVM、神经网络、1_k近邻法,包括广义互相关函数GCC时延估计，包含收发两个客户端的链路级通信程序,wxJCdQm条件本程序的性能已经超过其他算法，快速扩展随机生成树算法。- Including the area, perimeter, rectangular, elongation, qOQTSNw parameter Including the least squares method, the SVM, neural networks, 1 _k neighbor method, Including the generalized cross-correlation function GCC time delay estimation, Contains two clients receive link-level communications program, wxJCdQm condition This program has exceeded the performance of other algorithms, Rapid expansion of random spanning tree algorithm. Platform: |
Size: 6144 |
Author:qigbxv |
Hits:
Description: 主同步信号PSS在时域上的相关仿真，添加噪声处理，本程序的性能已经达到较高水平，基于互功率谱的时延估计，预报误差法参数辨识-松弛的思想，表示出两帧图像间各个像素点的相对情况。-PSS primary synchronization signal in the time domain simulation related, Add noise processing, The performance of the program has reached a high level, Based on the time delay estimation of power spectrum, Prediction Error Method for Parameter Identification- the idea of relaxation, Between two images showing the relative circumstances of each pixel. Platform: |
Size: 6144 |
Author:diikih |
Hits:
Search - delay performance