Description: 这是一个基于Simulink的通信系统的仿真程序，主要内容是QPSK在IS-95前向信道中的应用，以衡量其性能。-This is a simulation-based communications system simulation program, main contents of the QPSK in IS-95 to the channel, in order to measure its performance. Platform: |
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Author:andrew |
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Description: 这是一个基于Simulink的通信系统的仿真程序，主要内容是QPSK在IS-95前向信道中的应用，以衡量其性能。-This is a simulation-based communications system simulation program, main contents of the QPSK in IS-95 to the channel, in order to measure its performance. Platform: |
Size: 5120 |
Author:andrew |
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Description: 多径信道仿真
有三条固定路径的AWGN多径信道的QPSK系统进行BER性能方针，并与在理想的AWGN信道中同样系统的BER进行比较，为简化模型，作如下假设：
1，信道中有三条路径，包括一条没有衰落的LOS路径和两条具有瑞利衰落的路径。与各路径相应的接收功率以及路径间的延迟差是仿真的参数
2，信道的锐利衰落仅影响发送信号的幅度，不影响瞬时相位。
3，在符号间隔内各多径分量的衰减幅度是常数，并与相邻间隔无关。-Multipath channel simulation There are three fixed path multipath AWGN channel BER performance of QPSK systems approach, and in an ideal AWGN channel BER the same system for comparison, in order to simplify the model, make the following assumptions: 1, There are three channels path, including a no decline LOS path and the two have a Rayleigh fading path. Corresponding with the path to receive power as well as the path delay difference between the simulation parameters of 2, channel sharp decline affects only the magnitude of the transmitted signal, does not affect the instantaneous phase. 3, in the symbol intervals multipath component of the decay rate is constant, and has nothing to do with the next interval. Platform: |
Size: 5120 |
Author:TT |
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Description: 使用JAVA I/O和 NI/O编写的两种网络ECHO服务器，用以学习两种IO的不同编程方法，体验基于阻塞与非阻塞IO开发高性能网络应用程序的具体实例.Java平台传统的I/0系统基于byte(字节)和Stream(数据流)。这种模式下的I/O 操作以字节为单位,以流的方式处理数据。而NIO( New I/O )以块的方式处理数据，它的系统操作面向Buffer(缓冲),Channel(通道)和Selector(选择器)，不再是字节，这种模式利用了操作系统管理内存和文件的方式，并将一些耗时操作直接转移给操作系统，使JavaI/O的速度得以提高、性能得到了明显的改善
-The use of JAVA I/O and NI/O, prepared by two types of network servers ECHO to learn two different programming methods IO experience obstructive and non-blocking IO based on the development of high-performance network applications specific examples. Java platform for the traditional I/0 system is based on the byte (byte) and Stream (data streams). This mode of I/O operation in bytes in order to deal with data flow way. The NIO (New I/O) blocks the way to deal with data, its system for Buffer (buffer), Channel (channel) and the Selector (selector), is no longer a byte, this mode of use of operating system management of memory and the manner in which documents, and some time-consuming operation of a direct transfer to the operating system, so that JavaI/O speed will be increased and performance improved significantly Platform: |
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Author:郭为 |
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Description: 摘要本文首先分析了自适应调制的原理, 它以频谱效率最高为准则, 在恒定功率约束条件下对接收信噪
比优化来选择不同调制阶数。然后引入时变多径信道模型, 通过仿真给出了自适应在此信道条件下的性能, 并分析
了信道估计误差对其性能的影响。
关键词自适应调制, 调制, 时变信道-Abstract This paper first analyzes the principle of adaptive modulation, spectral efficiency it up to standards, in the constant power constraint condition to receive a letter under the noise
Optimization to select different modulation than the order of. Then the introduction of time-varying multi-path channel model is given by simulation of adaptive channel conditions in this performance, and analyze the
The channel estimation error on their performance.
Key words adaptive modulation, modulation, time-varying channel Platform: |
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Author:yanyan |
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Description: 信道均衡技术（Channel equalization）是指为了提高衰落信道中的通信系统的传输性能而采取的一种抗衰落措施。它主要是为了消除或者是减弱宽带通信时的多径时延带来的码间串扰（ISI）问题。 其机理是对信道或整个传输系统特性进行补偿，针对信道恒参或变参特性，数据速率大小不同，均衡有多种结构方式。大体上分为两大类：线性与非线性均衡。对于带通信道的均衡较为困难，一般都是待接收端解调后在基带进行均衡，因此基带均衡技术有广泛应用。在实际中一般是加入自适应滤波器来实现信道均衡。-Equalization techniques (any) is to point to in order to improve the equalization fading Channel of communication system of transmission performance to a fight decline measures. It basically is to eliminate or is weaken broadband communication the multipath delay when the code brings between crosstalk (ISI) problem. Its mechanism is the transmission system of channel or characteristics in constant and compensation, or change the channel and characteristics, data rate of different size, balanced and DuoZhong structure mode. Roughly divided into two categories: linear and nonlinear equilibrium. For the balance of the way with communication is difficult, are generally stay at the receiving end in baseband for balanced after demodulation, therefore baseband balanced technology has wide application. In actual in general was to join the adaptive filter to realize equalization.
Platform: |
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Author:韩金雨 |
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Description: 为了提高MIMO-OFDM系统的数据传输率和频谱利用率,提出一种新的自适应算法。该算法在保证信道质量所需误码率和总发射功率的前提下,按照各个子载波衰落程度动态地分配比特和功率,使系统的总数据传输速率最大。理论分析得出,该算法降低了系统运算复杂度,能很大地改善系统的整体性能。-In order to improve data transmission rates and spectrum efficiency of MIMO-OFDM systems,this paper proposes a new adaptive algorithm. While the channel transmission quality to meet the requirements of a certain target BER(bit error rate) and total emissive power,according to each sub-carrier decline degree to adjust each sub-carrier modulation method freely,try to minimize the total data rate of system. Theory analysis shows the algorithm can reduce system complexity and improve overall performance of the ... Platform: |
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Author:王睿 |
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Description: The major evolution of UMTS (Universal Mobile Telecommunications System) in recent years
is the High Speed Downlink Packet Access (HSDPA)which provides data rates up to 10Mbps. The
implementation of HSDPA includes multicodes transmission in joint application with Adaptive
Modulation and Coding (AMC) as well as Hybrid Automatic Repeat reQuest (HARQ).
This thesis deals with the implementation of the HSDPA simulator in FDD (Frequency Division
Duplex) mode according to 3GPP technical specifications. It also aims to study the HARQ
algorithms for HSDPA. The performance of AMC is significantly degraded when higher order
modulation (16-QAM) is used in a multipath environnement. Moreover, the HSDPA simulator requires
a very long time of computation to provide good performance in multipath channel. In order
to solve this problem, we have introduced a simplified simulator which exploits the performance
of HSDPA over gaussien channel as look-up tables to compute the block error rate in multipath
channel. Platform: |
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Author: |
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Description: 为了使数字信号在有限带宽的高频信道中传输，必须对数字信号进行载波调制。就频带利用率和抗噪声性能（或功率利用率）两个方面来看， QPSK系统最佳。QPSK是利用载波的四种不同相位差来表征输入的数字信息，是四进制移相键控（QPSK）。本项目用MATLAB软件对四进制移相键控信号在AWQN信道中传输进行了建模和仿真，通过对仿真得到的误码率和理论误码率进行比较和分析，从而证明了MATLAB软件仿真QPSK调制解调的可行性。-In order to make the digital signal in the high-frequency channel of limited bandwidth transmission of digital signal carrier modulation. Two in terms of bandwidth efficiency and anti-noise performance (or power utilization), QPSK system the best. QPSK, four different phase characterized by the input digital information using carrier quaternary phase shift keying (QPSK). This project using MATLAB software quaternary phase shift keying signal channel transmission in AWQN modeling and simulation, to compare and analyze the error rate obtained by the simulation and theoretical bit error rate, thus proving the simulation of MATLAB software QPSK modulation and demodulation of feasibility.- Platform: |
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Author:黄兰凤 |
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Description: nRF24L01-Quick-Dev
2.4GHz nRF24L01开发系统使用手册
为了便于用户开发应用先进的2.4GHz nRF24L01高速2Mbps无线芯片开发，迅通科技提供nRF24L01快速开发系统，nRF24L01开发系统包括两个无线高速多频道模块、两个开发板(含可更换MCU及用户开发空间)，详细源代码，原理图，资料光盘，开发板上有MCU、串口、按键和指示灯等，加电即可使用，可完成无线双向数据高速传输的全部功能，并可方便地进行性能以及距离评测，并迅速掌握nRF24L01的多频以及高速无线通信编程和协议的设计。
时间：缩短你的开发时间，建立你对2.4GHz RF产品开发的信心
风险：接近实用的评估板，方便验证和改进，零风险
费用：只需不到一个工程师一个月的薪水或你预算内很小一部分
市场：可对多种产品及应用进行验证，实现平台的验证与应用
资料：技术资料全，上手快，可以使你立刻进入与世界同步的2.4GHz无线设计领域-NRF24L01-Quick-Dev
2.4GHz nRF24L01 development system manual.
In order to facilitate the users to develop the application of advanced 2.4GHz nRF24L01 2Mbps high speed wireless chip development, electric technology to provide nRF24L01 rapid development system, the development of nRF24L01 system includes two wireless high speed multi channel module, two development board (including replaceable MCU and user space ), detailed source code, schematics, data discs, the development board MCU, serial, buttons and lights, power can be used, can complete the two-way wireless high-speed data transmission of all functions, and can be conveniently carried out performance as well as the distance measure, and quickly grasp nRF24L01 multiple frequency and high speed wireless communication programming and protocol design.
Time: reduce your development time, build your confidence on 2.4GHz RF product development
Risk: close to the practical evaluation board, convenient for validation and impr Platform: |
Size: 432128 |
Author:万奇 |
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Description: 使用8051单片机与ADC0809设计数据采集系统实验文档与程序1. 采用8051和ADC0809构成一个8通道数据采集系统。
2. 能够顺序采集各个通道的信号。
3. 采集信号的动态范围：0～5V。
4. 每个通道的采样速率：100 SPS。
5．在面包板上完成电路，将采样数据送入单片机20h～27h存储单元。
6．编写相应的单片机采集程序，到达规定的性能。
-Using 8051 data acquisition system with ADC0809 design documentation and procedures experiment 1 using 8051 and ADC0809 constitute an 8-channel data acquisition system. (2) in order to collect the signal for each channel. 3. Acquisition signal dynamic range: 0 ~ 5V. 4 sample rate per channel: 100 SPS. 5. Complete the circuit on a breadboard, the sampled data into the microcontroller 20h ~ 27h storage unit. 6. Preparation of the corresponding single-chip acquisition program, to reach the required performance. Platform: |
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Author:wenshang |
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Description: MIMO-OFDM系统子空间法进行盲信道估计，可更改循环前缀长度以比较不同CP对估计性能的影响。-subspace method for blind channel estimation for MIMO-OFDM system. One can change the length of cyclic prefix in order to compare the performance of different CP impact on the estimates. Platform: |
Size: 2048 |
Author:snoopy |
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Description: Cooperative communications techniques exploit the
spatial diversity of wireless radio channel by forming antenna arrays in order to achieve Multiple Input Multiple Output (MIMO) performance in multi-user single-antenna environment. Platform: |
Size: 120832 |
Author:Hakim |
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Description: This Paper is concerned with the study of the performance of DPSK (differential phase shift keying)
Modulation Technique using AWGN(Additive white gaussian noise) channel. The DPSK has remarkable
features such as limited bandwidth and constant envelope, which are of importance for mobile communication
systems for providing the output according to our needs and requirement. In this study we evaluated the Bit
error rate performance of the CDMA system by designing the CDMA system using SIMULINK Tool of the
MATLAB software and study the performance characteristics of DPSK modulated CDMA system which are
helpful for raising the level of present day communication systems, In order to design our DPSK modulated
CDMA system we varied only modulation blocks of simple CDMA transmitter and receiver sections. Platform: |
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Author:j |
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Description: An electrocardiogram (ECG) records the electrical activity of the heart. The heart
produces tiny electrical impulses which spread through the heart muscle to make the
heart contract. These impulses can be detected by the ECG machine. Electronic fetal
ECG monitoring is a technique of obtaining important information about the condition of
the fetus during pregnancy, by measuring the electrical signals generated by the fetal
heart as measured multi-channel electrodes placed on the mother’s body surface.
Fetal ECG (FECG) monitoring enables accurate measurement of fetal cardiac
performance including transient or permanent abnormalities of rhythm. During labor and
delivery, the heartbeat of the baby is monitored in order to make sure that enough blood
flow and oxygen are getting through to the unborn fetus.
-An electrocardiogram (ECG) records the electrical activity of the heart. The heart
produces tiny electrical impulses which spread through the heart muscle to make the
heart contract. These impulses can be detected by the ECG machine. Electronic fetal
ECG monitoring is a technique of obtaining important information about the condition of
the fetus during pregnancy, by measuring the electrical signals generated by the fetal
heart as measured multi-channel electrodes placed on the mother’s body surface.
Fetal ECG (FECG) monitoring enables accurate measurement of fetal cardiac
performance including transient or permanent abnormalities of rhythm. During labor and
delivery, the heartbeat of the baby is monitored in order to make sure that enough blood
flow and oxygen are getting through to the unborn fetus.
Platform: |
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Author:bala |
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Description: In advanced TDMA mobile communications systems,
reduced-state equalization algorithms have to be employed
because high-level modulation is used in order
to improve spectral efficiency. Such equalizers have
only high performance, if the overall discrete-time
system to be equalized is minimum-phase. Therefore,
in general, a discrete-time prefilter has to be
inserted in front of equalization. In literature, several
approaches have been proposed for computation
of a suitable FIR or IIR prefilter. In this paper,
we present an approach for FIR prefilter computation,
which is quite robust and requires an only moderate
computational complexity. The prefilter consists
of the cascade of a channel-matched filter and
a prediction-error filter, which can be calculated via
the Levinson-Durbin algorithm. Simulation results
are given, which demonstrate that the performance
of the proposed approach is essentially equivalent to
the case of reduced-state equalization combined with
ideal allpass prefiltering. Platform: |
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Author:ali |
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Description: 实现瑞利信道下M阶QAM调制的EGC接收仿真，并与MRC理论上的SER和BER性能对照-Implementation under Rayleigh channel EGC receive simulation, M order QAM modulation and with MRC theory SER and BER performance comparison. Platform: |
Size: 51200 |
Author:明月 |
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Description: The objective of this thesis to implement and simulate the IEEE 802.16 OFDM
physical layer using Matlab in order to have better understanding of the standard and the system performance. This involves studying, through simulation, the various PHY
modulation, coding schemes and interleaving in the form of biterrorrate
(BER) and
blockerrorrate
(BLER) performance under reference channel models.-The objective of this thesis is to implement and simulate the IEEE 802.16 OFDM
physical layer using Matlab in order to have better understanding of the standard and the system performance. This involves studying, through simulation, the various PHY
modulation, coding schemes and interleaving in the form of biterrorrate
(BER) and
blockerrorrate
(BLER) performance under reference channel models. Platform: |
Size: 7168 |
Author:Alygert |
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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: |
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Author:Casper_z
|
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Description: Intelligent reflecting surface (IRS) is a promising
technology to enhance the coverage and performance of wireless
networks. We consider the application of IRS to non-orthogonal
multiple access (NOMA), where a base station transmits superposed signals to multiple users by the virtue of an IRS. The
performance of an IRS-assisted NOMA networks with imperfect
successive interference cancellation (ipSIC) and perfect successive
interference cancellation (pSIC) is investigated by invoking 1-
bit coding scheme. In particular, we derive new exact and
asymptotic expressions for both outage probability and ergodic
rate of the m-th user with ipSIC/pSIC. Based on analytical
results, the diversity order of the m-th user with pSIC is in
connection with the number of reflecting elements and channel
ordering. The high signal-to-noise radio (SNR) slope of ergodic
rate for the m-th user is obtained. The throughput and energy
efficiency of IRS-NOMA networks are discussed both in delaylimited and delay-tolerant transmission modes. Additionally, we
derive new exact expressions of outage probability and ergodic
rate for IRS-assisted orthogonal multiple access (IRS-OMA).
Numerical results are presented to substantiate our analyses and
demonstrate that: i) The outage behaviors of IRS-NOMA are
superior to that of IRS-OMA and relaying schemes; ii) The M-th
user has a larger ergodic rate than IRS-OMA and benchmarks.
However, the ergodic performance of the m-th user exceeds
relaying schemes in the low SNR regime; and iii) The IRS-assisted
NOMA networks have ability to achieve the enhanced energy
efficiency compared to conventional cooperative communications Platform: |
Size: 340469 |
Author:dipfr@yahoo.fr |
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Search - CHANNEL ORDER PERFORMANCE