Description: 本文主要研究了W-WAN中GPRS网络的移动视频传输问题。文中探讨了GPRS的网络结构、协议体系以及链路特性，从中我们看出：
GPRS网络链路不仅具有一般无线链路数据传输中遇到的延迟大、误码率高等共性问题，而且具有移动通信系统采用蜂窝频率复用方式带来的小区切换，
以及由于通信中链路性能随着地理位置变换而变化造成的GPRS网络中不可避免的经常性遭遇的冗长时延和突变时延。
这使得目前GPRS网络中使用的传统TCP或UDP传输协议均不能适应GPRS自身的链路特性，也不能实现高效的分组传输。-This paper mainly studied the W-WAN in the GPRS network for mobile video transmission problems. The article discusses the GPRS network architecture, protocol architecture, as well as link characteristics, from which we can see: GPRS network link not only has the general wireless link data transmission delay encountered in large, common problems of higher bit error rate, and with mobile communications system uses a cellular frequency reuse methods brought about by cell switching, as well as the communication link performance with the location change and change is inevitable GPRS network, the recurrent encountered lengthy delay and delay mutation. This makes the current GPRS network using the traditional TCP or UDP transport protocol are unable to adapt its own GPRS link characteristics, but also efficient packet transmission can not be achieved. Platform: |
Size: 3594240 |
Author:QHLee |
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Description: 采用Log-BP算法的LDPC码译码仿真程序，给出了不同信噪比下误码率和误包率的统计图，用matlab和C（c-mex）程序分别编写，有详细说明和注释。-The use of Log-BP decoding algorithm for LDPC code simulation program is given a different signal to noise ratio and bit error rate under the packet error rate of the statistical map, using matlab and C (c-mex) procedures, respectively, to prepare, has a detailed description and notes . Platform: |
Size: 77824 |
Author:智钢 |
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Description: 主要是针对现在的合作通信中，引入ARQ机制，仿真在AWGN信道下的误包率-Is mainly directed against the current cooperation communication, the introduction of ARQ mechanisms, simulation in the AWGN channel packet error rate Platform: |
Size: 6370304 |
Author:杨睛 |
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Description: (1) 315、433、868、915Mh的ISM 和SRD频段
(2) 最高工作速率500kbps，支持2-FSK、GFSK和MSK调制方式
(3) 高灵敏度（1.2kbps下-110dDm，1％数据包误码率）
(4) 内置硬件CRC 检错和点对多点通信地址控制
(5) 较低的电流消耗（RX中，15.6mA，2.4kbps,433MHz）
(6) 可编程控制的输出功率，对所有的支持频率可达+10dBm
(7) 支持低功率电磁波激活功能
(8) 支持传输前自动清理信道访问（CCA），即载波侦听系统
(9) 快速频率变动合成器带来的合适的频率跳跃系统
(10) 模块可软件设地址，软件编程非常方便
(11) 标准DIP间距接口，便于嵌入式应用
(12) 单独的64字节RX和TX数据FIFO-(1) 315,433,868,915 Mh of the ISM and SRD frequency bands (2) maximum rate of 500kbps, support for 2-FSK, GFSK and MSK modulation (3) high sensitivity (1.2kbps under-110dDm, 1 packet error bit-rate) (4) built-in hardware CRC error detection and control of point-to-multipoint communication address (5) a lower current consumption (RX in, 15.6mA, 2.4kbps, 433MHz) (6) programmable control of output power for all the support frequencies up to+ 10dBm (7) to support low-power electromagnetic wave activation (8) to support the transmission before the automatic clean-up Channel Access (CCA), namely Carrier Sense System (9) Fast frequency synthesizer brought about by changes in suitable frequency hopping system (10) modules can be software-based address, software programming is easy (11) standard DIP spacing interfaces for embedded applications (12) separate 64-byte RX and TX data FIFO Platform: |
Size: 319488 |
Author:李华力 |
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Description: 教学实验源代码，提供对滑动窗口协议的实验演示，协议分层和协议软件的设计与实现有基本的认识利用所学数据链路层原理，自己设计一个滑动窗口协议并在仿真环境下编程实现有噪音信道环境下的
可靠的双工通信。信道模型为 8000bps 全双工卫星信道，信道传播时延 270 毫秒，信道误码率为 10-5，信道提供字节流传输服务，网络层分组长度在240~256字节范围-Teaching experiment source code, on the Sliding Window Protocol provides experimental demonstration of the agreement stratification and protocol software design and implementation of a basic understanding of the use of the data link layer principle, its own design of a sliding window protocol and simulation programming environment the realization of the noise channel environment duplex reliable communication. Channel model for 8000bps full-duplex satellite channel, channel propagation delay of 270 ms, channel bit error rate of 10-5, byte-stream channel to provide transmission services, network layer packet length in the range of 240 ~ 256 bytes Platform: |
Size: 414720 |
Author:Tony Yau |
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Description: 此代码为π_4DQPSK解调源程序，用MATLAB实现,使用差分方式。-This demodulation π_4DQPSK source code using MATLAB to achieve, the use of differential mode. Platform: |
Size: 1024 |
Author:qinhong |
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Description: 这个程序是一个数据包误比特率的测试程序，设计了两个节点，一个接收，一个发射。-This application functions as a packet error rate (PER) tester.
One node is set up as transmitter and the other as receiver. The role and
configuration parameters for the PER test of the node is chosen on initalisation by navigating the joystick and confirm the choices with S1. Platform: |
Size: 191488 |
Author:liuxiang |
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Description: — Performance comparison of multiuser OFDM-TDMA and
OFDMA systems by considering physical and link cross-layer behavior
is conducted in this work. We provide a new framework for performance
evaluation that centers on “ scheduling” with several different
subcarrier/bit allocation schemes. The performance metrics include: the
bit rate, the bit error rate (BER), packet throughput and delay. The
instantaneous channel conditions of users are assumed to be available
at the base station, which can be achieved by channel estimation at the
mobile terminal (MT), and then fed back to the base station through
a control channel. To perform the link layer comparison, we model the
Rayleigh fading channel with a nite-state Markov chain, and adopt the
M/G/1 queueing model as the analytical tool. Computer simulation is
performed to verify conducted analytical results-— Performance comparison of multiuser OFDM-TDMA and
OFDMA systems by considering physical and link cross-layer behavior
is conducted in this work. We provide a new framework for performance
evaluation that centers on “ scheduling” with several different
subcarrier/bit allocation schemes. The performance metrics include: the
bit rate, the bit error rate (BER), packet throughput and delay. The
instantaneous channel conditions of users are assumed to be available
at the base station, which can be achieved by channel estimation at the
mobile terminal (MT), and then fed back to the base station through
a control channel. To perform the link layer comparison, we model the
Rayleigh fading channel with a nite-state Markov chain, and adopt the
M/G/1 queueing model as the analytical tool. Computer simulation is
performed to verify conducted analytical results Platform: |
Size: 166912 |
Author:alaa |
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Description: Simulation program to realize OFDM transmission system using( proposed slantlt transform instead FFT transform)with pilot channel estimation in a fading channel for (BPSK,QPSK,8PSK and 16PSK) modulation and for two type of error plot BER(Bit error rate) and PER(Packet error rate) Platform: |
Size: 8192 |
Author:ghanim |
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Description: This Application Note illustrates Packet Error Rate (PER) testing using a Jennic JN5148
or JN5139 evaluation kit. PER testing can be used to evaluate the communication range
achievable in different operating environments. Platform: |
Size: 1254400 |
Author:jack |
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Description: 程序模拟了在AWGN和瑞利衰落环境下误比特率和分组差错率的情况，以及这两种环境下的对比分析，具体程序功能在text文件中给出了。-This program simulates bit error rate (BER) and packet error rate (PER) performances under AWGN environment and fading environment.All the functions are given in the TEXT fill Platform: |
Size: 286720 |
Author:wanghj |
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Description: packet error rate for direct wireless link from source wireless body area network node to the coordinator Platform: |
Size: 3072 |
Author:deepak |
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Description: packet error rate when wireless body area network sensor node communicates to the destination coordinator through wireless link in the presence of single relay Platform: |
Size: 5120 |
Author:deepak |
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Description: packet error rate computation when source wireless body area sensor node communicates to the destination coordinator through wireless link in presence of two relays Platform: |
Size: 7168 |
Author:deepak |
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Search - packet error rate