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 Platform: |
Size: 3829873 |
Author:亮仔 |
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Description: Digital Video Broadcasting (DVB)
Framing structure, channel coding and modulation
for 11/12 GHz satellite services-Digital Video Broadcasting (DVB) Framing structure, channel coding and modulation for 11/12 GHz sat ellite services Platform: |
Size: 349184 |
Author:刘洪林 |
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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 Platform: |
Size: 3829760 |
Author:亮仔 |
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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). Platform: |
Size: 7168 |
Author:王文 |
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Description: 格状编码调制是为解决卫星通信中信道噪声对接收的影响及带宽的限制而产生的，其将信道编码与调制很好的结合起来，并且能发挥各自的优点，这种方法在不增加带宽和相同的信息速率下可获得3~6dB的功率增益。-trellis coded modulation for satellite communications solutions Channel noise on the receiver bandwidth and the impact of the restrictions, it will channel coding and modulation good combine, and can play to their respective advantages, This method does not increase in the same bandwidth and speed of information available under the three-6dB gain power. Platform: |
Size: 7168 |
Author:GF |
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Description: This paper investigates the design of joint frequency
offset and carrier phase estimation of a multi-frequency time division
multiple access (MF-TDMA) demodulator that is applied to
a digital video broadcasting—return channel system via satellite
(DVB-RCS). The proposed joint estimation algorithm is based on
the interpolation technique for two correlation values in the frequency
and phase domains. This simple interpolation technique
can significantly improve frequency and phase resolution capabilities
of the proposed technique without increasing the number of
the correlation values. In addition, the overall block diagram of a
digital communications receiver for DVB-RCS is presented, which
was designed using the proposed estimation algorithms.
Index Terms—Carrier phase estimation, DVB-RCS, frequency
offset estimation, interpolation, joint estimation, MF-TDMA.-This paper investigates the design of joint frequencyoffset and carrier phase estimation of a multi-frequency time divisionmultiple access (MF-TDMA) demodulator that is applied toa digital video broadcasting-return channel system via satellite (DVB-RCS). The proposed joint estimation algorithm is based onthe interpolation technique for two correlation values in the frequencyand phase domains. This simple interpolation techniquecan significantly improve frequency and phase resolution capabilitiesof the proposed technique without increasing the number ofthe correlation values. In addition, the overall block diagram of adigital communications receiver for DVB-RCS is presented, whichwas designed using the proposed estimation algorithms.Index Terms-Carrier phase estimation, DVB-RCS, frequencyoffset estimation, interpolation, joint estimation, MF-TDMA. Platform: |
Size: 500736 |
Author:吴大亨 |
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Description: Digital broadcasting systems for television,
sound and data services
Framing structure, channel coding and modulation
for 11/12 GHz satellite services
Platform: |
Size: 338944 |
Author:David |
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Description: 卫星通信系统链路仿真平台,对应于多种信道模型-Satellite communications system link simulation platform, corresponding to a variety of channel model Platform: |
Size: 2950144 |
Author:陈雨沁 |
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Description: 就通信系统而言，涉及到有线信道及非卫星无线信道的问题时，信道不再可以看成为恒参信道，信号往往是通过未知信道传播，通常把这样的信道称为盲信道。 本源代码对盲信道的参数进行估计，利用matlab仿真，对做盲信道的工程人员有一定的借鉴价值。-On communications systems, related to non-cable channels and the issue of satellite radio channel, channel no longer can be seen as a channel Constant reference signal is often spread through unknown channels, usually channel such as the blind channel. Source code for the blind channel estimation of the parameters, the use of matlab simulation, on the blind channel to do the engineering staff from a certain value. Platform: |
Size: 2048 |
Author:Jackson |
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Description: 针对TCP (Transmission Control Protocol) 协议在高速卫星因特网中传输吞吐量低的问题, 提出了一种改
进TCP快速恢复的算法。该算法根据卫星信道由传输错误造成的分组丢失概率远大于由拥塞造成的分组丢失
概率的特点, 通过加快窗口的增长速度, 避免过早地进入拥塞避免阶段, 达到了提高TCP吞吐量的目的。通
过NS2软件模拟仿真了高速卫星因特网环境, 并对各个TCP版本和改进算法的仿真结果进行了比较和分析。
仿真结果表明, 改进算法的吞吐量比TCP2SACK提高了约10 , 比TCP2Reno提高了约30 。-A new algorithm is p roposed to imp rove the throughput of high speed satellite&internet network. In
satellite channels, most of lost package is due to transmission error instead of congestion. We can make some im2
p rovement on TCP (Transmission Control Protocol) fast recovery algorithm. Bymaking the window increase fas2
ter and not enter congestion avoidance too early. We imp rove the throughput of TCP. We use NS2 to simulate the
environment of satellite and internet network, and the results are compared. In simulation, about 10 through2
put in our algorithm is imp roved than TCP2SACK, and that is about 30 imp roved than TCP2Reno.
Key words: high speed satellite and internet network satellite channel transmission control p rotocol ( TCP) Platform: |
Size: 601088 |
Author:王立 |
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Description: 数据链路层的选择性重传协议的编写。在仿真环境下编程实现有噪音信道环境下
两站点之间无差错双工通信。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，网络层分组长度固定为256字节-The data link layer selective retransmission protocol preparation. In the simulation environment, programming environment, the noise channels between the two sites error-free duplex communication. Channel model for 8000bps full duplex satellite channel, the channel propagation delay 270 milliseconds, the channel bit error rate of 10-5, the channel to provide byte-stream transport service, the network-layer packet length is fixed to 256 bytes Platform: |
Size: 207872 |
Author:chenchen |
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Description: 地面移动卫星信道仿真程序 考虑雨衰 阴影 和多径影响-Land mobile satellite communication channel simulation program to consider the shadow of rain attenuation and multipath effects Platform: |
Size: 1024 |
Author:张晓娟 |
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Description: 设计并仿真了适合Ka 频段卫星移动信道的信号传输体制仿真结果为最终实现方案提供
了可靠的数据同时针对所设计的Turbo 编码和GMSK 调制相结合的信号传输体制提出了迭
代信道估计算法明显改善了系统的误码率BER 性能-Designed and simulated for Ka-band mobile satellite channel signal transmission system simulation results for the final program provides reliable data also for the design of the Turbo coding and GMSK modulation combined signal transmission system proposed iterative channel estimation algorithm significantly improved the system bit error rate BER performance Platform: |
Size: 461824 |
Author:motonula |
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Description: propagation channel modelling and time series systhesizers for the simulation of satellite communication systems.PDF Platform: |
Size: 319488 |
Author:rmbswd |
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Description: 给出了OFDM在卫星通信中的系统框图并
在Simulink中仿真实现，利用改进的CMA恒模算法进行盲均衡处理，来去除时变卫星信道对信号的影响,基于4阶累积量的方法
将OFDM信号与其他调制类型信号区分开来-OFDM is given in the satellite communication system block diagram and Simulation in Simulink using the modified constant modulus algorithm CMA for blind equalization, to remove the time-varying satellite channel on the signals, based on 4-order cumulant method OFDM signals and other types of signal modulation to distinguish Platform: |
Size: 3167232 |
Author:赵亮 |
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Description: This file is the programs of (chapter 9) of book (Modeling the Wireless Propagation Channel a Simulation Approach with MATLAB) which is related The Land Mobile Satellite Channel. It helps you to simulate The Land Mobile Satellite Channe. Platform: |
Size: 9309184 |
Author:mostafap |
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Search - satellite channel