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Description: 用matlab仿真实现了25 kHz 带宽内同时传送总共48 kbit/s 的两路语音(每路速率9. 6
kbit/s) 和两路数据信息(速率分别为19. 2 kbit/s 和9. 6 kbit/s) , 仿真结果表明达到了较好的误码性能。并比较了4 种数字调制方式下O FDM 系统的误码性能。-using Matlab Simulation bandwidth of 25 kHz simultaneous transmission within a total of 48 kbit / s 2 Road Voice (rate of 9 per road. 6 kbit / s) and two road data information (rate of 19. 2 kbit / s and 9. 6 kbit / s), the simulation results indicate achieve a better BER. And comparison of four types of digital modulation mode O FDM system BER.
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Size: 27107 |
Author: 林志宏 |
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Description: GMSK信号进行了仿真研究,GPRS采用与GSM 相同的频段、频带宽度、突发结构、无线调制标准、跳频规则以及相同的TDMA帧结构。因此，在GSM系统的基础上构建GPRS系统时，GSM系统中的绝大部分部件都不需要作硬件改动，只需作软件升级-GMSK signal simulation, GPRS and GSM using the same frequency and bandwidth, unexpected structure, the wireless standard modulation, frequency hopping and the same rules TDMA frame structure. Therefore, in the GSM system constructed on the basis of GPRS system, GSM System of most components do not need to make hardware changes, only for software upgrades
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Size: 366738 |
Author: abbey |
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Description: 估算并画出高斯脉冲的前15阶导函数的-10dB带宽。函数以下列变量为输入：a的最小值alphamin，-estimates and the mapping out of the Gaussian pulse before 15 derivative function-10dB bandwidth. Function for the importation of the following variables : a minimum of alphamin.
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Size: 1393 |
Author: meimei |
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Description: 估算在给定门限下常用输入信号的带宽。函数将代表待分析波形的矢量signal作为输入-estimate in a given threshold under the common input signal bandwidth. Function will be representative of the waveform analysis as input vector signal
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Size: 1153 |
Author: meimei |
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Description: Bing is a point-to-point bandwidth measurement tool (hence the b ), based on ping. Bing determines the real (raw, as opposed to available or average) throughput on a link by measuring ICMP echo requests roundtrip times for different packet sizes for each end of the link-Bing is a point-to-point bandwidth measur ement tool (hence the b), based on ping. Bing determines the real (raw, as opposed to available or average) throughput on a link by measuring ICMP echo requests roundt rip times for different packet sizes for each en d of the link
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Size: 38847 |
Author: sdfghj |
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Description: 提高卫星通信信道传输效率的新途径本 文 结 合 V SAT卫星通信系统设计中涉及卫星通信传输技术极为重要的
信道编码与调制解调方式，探讨了各种新型的卫星信道编码与调制解调技术，
它们的原理及在卫星通信中的应用。在数字调制中，信号传输质量主要取决于
比特差错率BER (Bit Error Rate)，因此要尽可能采用相同的每比特信号能量与
噪声功率谱密度比(Eb/N.)的条件下，BER低的调制方式，以节省卫星功率
另外频带利用率要尽可能的高，以节省宝贵的卫星频带。本文还对各种不同的
差错编码与调制技术进行了实验和详细的性能比较。-improve satellite communications channel transmission efficiency of new ways this paper V SAT satellite communications system design involving Wei Star Communication Technology extremely important channel coding and modulation and demodulation, explore a variety of new satellite channel coding and modulation and demodulation techniques, their principles and satellite communications applications. Digital modulation, signal transmission depends on the quality of the main bit error rate BER (Bit Error Rate). therefore possible to use the same energy per bit signal with noise power spectral density ratio (Eb / N.), under the condition BER low modulation mode to save power satellite bandwidth utilization addition to the possible high to save valuable satellite frequency bands. This paper is als
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Size: 3829873 |
Author: 亮仔 |
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Description: 这个是目前国际上比较怪异的一种长距离高带宽环境下的拥塞控制算法，优点是除了吞吐量之外什么都好，缺点是吞吐量太低-this is the strange world of a relatively long-distance high-bandwidth environment congestion control algorithm, Apart from the advantages of throughput beyond what is good, the drawback is too low throughput
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Size: 126951 |
Author: 王猛 |
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Description: mysee网络直播源代码Mysee Lite是Mysee独立研发的网络视频流媒体播放系统。在应有了P2P技术和一系列先进流媒体技术之后，OpenMysee能在现有网络带宽的基础上极大地提高网络视频的质量，包括画面的流畅，清晰度以及并发用户数。能够应用于网络视频直播，大规模电视会议，大规模远程教学，IPTV等多个领域。-mysee network broadcast source code Mysee Lite is Mysee independent research and development of Network Video Streaming Media Player system. Due in the P2P technology, and a series of advanced streaming media technology, OpenMysee in existing network bandwidth on the basis of greatly enhancing the quality of video network, including pictures of the fluent, and the clarity with the number of users. Video can be used in a live network, and large-scale video conferencing, large-scale distance learning, IPTV, and other fields.
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Size: 6482873 |
Author: asdfasdf |
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Description: Internet瓶颈链路带宽测量方法，我认为值得大家参考-Internet link bandwidth bottleneck measurement method, I think we reference
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Size: 173888 |
Author: 叶俊鹏 |
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Description: This m-file simulates MPSK (theoretical and simulated) with Gray coding
This m-file simulates MPSK (BPSK,QPSK,8PSK)with theoretical and simulated results using Gray coding. Numerical examples of a satellite link design are shown using QPSK and/or 8PSK when the bit rate(Rb)is greater than the channel bandwidth Wc (Band-limited channel).
-This m-file simulates MPSK (a theoretical nd simulated) with Gray coding This m-file simu lates MPSK (BPSK, QPSK, 8PSK) with theoretical and simulated results u sing Gray coding. Numerical examples of a satel lite link design are shown using QPSK and / or 8PS K when the bit rate (Rb) is greater than the chann el bandwidth Wc (Band-limited channel).
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Size: 7747 |
Author: 王文 |
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Description: 高分辨率要求系统具有大的带宽，瞬时带宽的增加必将提高系统对硬件的要求，本文采用方便灵活的步进频率波形信号。脉间频率步进波形通过子脉冲载频的步进变化来获得大的有效带宽，使成像具有高分辨率，采用加窗和补零方法提高信噪比，但该信号对目标径向速度非常敏感。采用补零方法提高距离取样分辨率，使距离像细化，并用公式说明了补零只能提高距离取样分辨率，并不能改变频率步进信号的距离分辨能力。该信号波形对目标径向速度的敏感，使目标能量分散到邻近的距离单元造成距离分辨率下降，如果不事先进行速度补偿，直接对回波信号进行逆傅立叶变换，将使所成一维距离像发生频谱展宽，并伴有距离像发生平移。本文证明了当目标有径向速度时仍采用对回波信号直接进行逆傅立叶变换的方法将使一维距离像发生频谱展宽并伴有距离像发生频移，从而严重影响了一维距离像的质量。-high-resolution requirements of the system with large bandwidth, the increased instantaneous bandwidth will improve the system of hardware, In this paper, a flexible and convenient step frequency signals. Pulse frequency step-pulse waveform through the carrier frequency step to achieve great changes in the effective bandwidth. make imaging with high resolution, increasing the window and fill methods to improve signal-to-noise ratio is, However, the signal on the target radial velocity is very sensitive. Using zero-distance sampling method to improve resolution, so that distance as refinement, and formulates a zero-distance sampling can improve resolution, does not alter the frequency of the signal from stepping resolution capabilities. The signal waveform on the target radial velocity sens
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Size: 2351 |
Author: 石榴石 |
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Description: 从网络管理系统中获取网络主干链路带宽数据，计算带宽利用率，并生成主干链路带宽利用率图形。-from Network Management System access network backbone link bandwidth data to calculate bandwidth utilization, Generation and trunk link bandwidth utilization graphics.
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Size: 117632 |
Author: cj31415 |
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Description: 此源码是用DSP实现QPSK调制，在CCS软件上实现．采样速率为14400样点／s，载波频率为1800Hz,带宽为300～3300Hz，符号速率为2400符号／s，滚降系数为0.35．-this source is used DSP QPSK modulation, the CCS software to achieve. Sampling rate of 14,400 samples / s, the carrier frequency of 1800 Hz. bandwidth of 300-3300Hz, Symbol rate of 2,400 symbols / s, roll-off factor of 0.35.
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Size: 2596 |
Author: 钟金 |
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Description: 滤波函数的实现，包括高通、低通、带宽等各种滤波算子，如equal,lag-the realization filter function, including high-pass, low-pass, and other bandwidth filtering operator, such as equal, lag, etc.
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Size: 16629 |
Author: yiting |
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Description: 基于Speex的音频压缩和解码器的源代码，不次于iLBC，处理丢包＆窄带宽时，5～30k下声音非常不错-based on the Speex audio compression and decoding of the source code, of which iLBC. handle packet loss & narrow bandwidth, 5 - 30k under very good voice
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Size: 549891 |
Author: hnycmx |
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Description: 对基于最新一代通用GPU－－Geforce8800显存带宽的测试样例，对于通用计算而言，带宽的性能是至关重要的。-based on the latest generation of common GPU -- Geforce8800 memory bandwidth of the test sample. For general calculation, the performance bandwidth is essential.
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Size: 1580337 |
Author: 白洪涛 |
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Description: 这是G.723和G.729的音频编解码的源代码，当在网络带宽不够的时候可考虑采用该语音编码方式。-This is the G.723 and G.729 audio codec source code, When the network bandwidth may be insufficient time to consider the use of the voice coding.
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Size: 983802 |
Author: justice666 |
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Description: 很好的能解决网络数据丢包处理的算法。特别是在带宽一定的情况下，解决网络数据传输和带宽、数据传输完整性的较优解决方案。-good solution processing network data packet loss algorithms. Especially in certain circumstances bandwidth, the solution to network bandwidth and data transmission, data transmission integrity of the optimum solution.
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Size: 506291 |
Author: superhurricane |
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Description: ifstat源代码，统计网络带宽，使用于linux平台-ifstat source code, network bandwidth statistics, the use of Linux platform
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Size: 141838 |
Author: 吕布 |
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Description: 这个程序有PC的服务端和Pocket PC上的客户端两个部分。服务端运行时，按下开始就可以从PC机的摄像头捕获视频，并且使用H.263编码进行压缩。这时服务端将在TCP的8765端口进行监听；这时运行客户端，输入服务器IP地址并点击“连接”，在网络正常的情况下，将实时显示服务端摄像头捕捉到的画面，画面的实时性取决于网络的带宽。
-this procedure is the server PC and Pocket PC client of two parts. The server is running, pressing from the start of PC cameras capture video, H.263 coding and the use of compression. Then the server will be in the 8765 TCP port eavesdropping; Then run the client, Enter the server IP address and click the "link" the network under normal circumstances. real-time display of server-side cameras to capture the screen, the screen depends on the real-time nature of the network bandwidth.
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Size: 1947632 |
Author: fangzongdi |
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