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[Other resourceSimulation-Performance-Analysis-of-OFDM-System-in-

Description: 构建了正交频分复用(OFDM)系统的仿真模型,给出了具体信道的参数。在不同信道传输环境下,对不同调制方式和 不同移动速度下的OFDM系统性能进行了分析比较,在仿真结果的基础上给出了OFDM系统抗多普勒频移的参考方案,采 用的信道模型基于ITU - RM. 1225 ChannelB瑞利(Rayleigh)衰落信道。最后,在基于COST 207的信道模型下,对四种典型 环境的OFDM系统进行了仿真研究,并对其结果作了讨论分析。结果表明:在多径衰落信道下,OFDM系统可以有效克服多 径衰落和多普勒频移,能够应用于未来的通信系统。 关键词:正交频分复用 多径衰落信道 多普勒效应 循环前缀
Platform: | Size: 522299 | Author: 子羽 | Hits:

[Software EngineeringCO-OFDM 传输系统调制方式分析

Description: CO-OFDM 传输系统调制方式分析
Platform: | Size: 316311 | Author: wjxlovey | Hits:

[Software EngineeringCO-OFDM 传输系统调制方式分析

Description: CO-OFDM 传输系统调制方式分析
Platform: | Size: 316311 | Author: wjxlovey | Hits:

[Post-TeleCom sofeware systemsSimulation-Performance-Analysis-of-OFDM-System-in-

Description: 构建了正交频分复用(OFDM)系统的仿真模型,给出了具体信道的参数。在不同信道传输环境下,对不同调制方式和 不同移动速度下的OFDM系统性能进行了分析比较,在仿真结果的基础上给出了OFDM系统抗多普勒频移的参考方案,采 用的信道模型基于ITU - RM. 1225 ChannelB瑞利(Rayleigh)衰落信道。最后,在基于COST 207的信道模型下,对四种典型 环境的OFDM系统进行了仿真研究,并对其结果作了讨论分析。结果表明:在多径衰落信道下,OFDM系统可以有效克服多 径衰落和多普勒频移,能够应用于未来的通信系统。 关键词:正交频分复用 多径衰落信道 多普勒效应 循环前缀-err
Platform: | Size: 522240 | Author: 子羽 | Hits:

[Software EngineeringOFDM_Technique_Simulation_Performance

Description: 摘要:基于通信技术的列车运行控制系统(CBTC)是铁路信号的发展方向,交频分复用 OFDM)是一种无线环境下的高速传输技术,它对高速列车控制信息传输中卞要受到的由于多 径传播引起的快衰落所产生的影响有很强的抵抗能力.本文首先介绍了OFDM技术的发展和 基本原理,然后在计算机上用M atlal〕对其性能进行了仿真,仿真中将OFDM与传统的单载波 调制方式—i1,交振幅调制( 1frQAM)对抗多径十扰的性能进行了比较,最后分析了一者的仿真结果. -Abstract: Based on the communication technology train operation control system (CBTC) is a railway signal direction for the development of cross-frequency division multiplexing OFDM) is a wireless environment of high-speed transmission technology, its high-speed train control information transmission Bian be subject to the Due to the spread of multi-path fast fading caused by the impact of a strong resistance to diseases. This paper first introduces the OFDM technology development and the basic principles, and then on the computer〕 M atlal use its performance simulation will OFDM with the traditional single-carrier modulation-i1, cross-amplitude modulation (1frQAM) against multi-path interference of the 10 properties were compared with a final analysis of the simulation results.
Platform: | Size: 36864 | Author: ma ming | Hits:

[File FormatADSL_based_high-speedcabletelemetry

Description: 电缆遥测传输是测井系统传输数据的主要方式。针对测井电缆传输速率低、 带宽窄等瓶颈问题 ,提出应用 ADSL 宽带网络接入的离散多音频调制(DMT)技术进行电缆传输的调制和解调 ,从理论上对此技术进行了详细分析 ,并 通过计算机仿真试验 ,证明该方法对于提高电缆的频带利用率是可行的。-Cable telemetry transmit is a main way of data transmission in well logging systems. In this paper , due to a variety of shortcoming of logging cable , such as low transmit speed and narrow bandwidth , a DMT technology with the application of ADS L wide band is presented. This technology is analyzed theoretically in detail , and it has been proved that this method is feasible in increasing the bandwidth using efficiency of the cable by compute emulation.
Platform: | Size: 367616 | Author: 秦赵真 | Hits:

[File FormatMPEG2_TS_analyse

Description: 目前,我国数字电视的信道传输的三种主要传输方式都有了统一明确的国家标准。其主要差别是信道编码、调制方法,但视频和音频信源处理和系统层复用都是以MPEG-2为基础的编码方案。MPEG-2标准自制定以来,已经成为数字电视领域中系统层的普遍标准。能够熟悉MPEG-2传输流码流语法结构,并运用分析工具对系统进行常规的检测分析,为快速确认系统故障,从而排除故障保证系统正常运行,对于广大工程技术人员十分必要。本文介绍MPEG-2传输流的语法结构及复用,及ETR290标准规定的传输码流3级错误检测参数,同时结合码流分析软件对MPEG-2传输流的语法结构作一离线分析。-transport stream analyser
Platform: | Size: 490496 | Author: 杨松 | Hits:

[3G developMatlabSimulation

Description: 通信系统设计,数字带通传输系统仿真Matlab代码 1. 比较BPSK与QPSK两种调制方式的误码率和误比特率性能(注意QPSK的误码率不同于误比特率),横坐标为SNR,并与理论曲线比较,分析解释仿真图。 2. 要求使用Matlab/C语言/Matlab-simulink中的任一种工具实现。 3. 代码中每个模块都要有详细注释说明。 -Communications systems design, digital bandpass transmission system simulation Matlab code 1. Comparison of BER QPSK and BPSK modulation methods and bit error rate performance (note QPSK error rate is different bit error rate), the horizontal axis is SNR, and compared with the theoretical curve, analysis and interpretation of simulation map. 2. requires the use of Matlab/C language/Matlab-simulink any one tool to achieve. 3. The code of each module must have a detailed explanatory notes.
Platform: | Size: 4096 | Author: wang | Hits:

[matlabOFDMxitongjiangdifengpingbiyanjiu

Description: 正交频分复用(OFDM)技术是一种可以有效对抗符号间干扰(ISI)的高速数据传输技术。OFDM是一种特殊的多载波调制方式,它的基本思想是将高速传输的数据流通过串/并转换,变成在若干个正交的窄带子信道上并行传输的低速数据流。OFDM接收机有三个关键技术:信道估计技术,降低峰均比(PAPR)技术和同步技术。OFDM技术能有效的对抗多径衰落等,有着诸多的优点,但是OFDM有一个发展瓶颈,即OFDM信号的峰均功率比很大,很容易导致OFDM信号的交调失真和系统性能的下降。因而如何降低OFDM信号的峰均功率比一直是OFDM技术的一个研究热点问题。论文针对上述问题,重点研究了降低OFDM信号的峰均功率比的SLM与PTS算法,并利用Matlab对算法进行了仿真研究,并对仿真结果进行了分析。-Orthogonal frequency division multiplexing (OFDM) is a high-speed data transmission technology that can effectively combat inter-symbol interference (ISI). OFDM is a special multi-carrier modulation method, its basic idea is to high-speed transmission of data stream through the serial/parallel conversion, in a number of orthogonal narrowband sub-channel parallel transmission of low-speed data stream. OFDM receivers have three key technologies: channel estimation techniques, reduced peak-to-average ratio (PAPR) techniques and synchronization techniques. OFDM technology can effectively combat multipath fading, etc., there are many advantages, but OFDM has a bottleneck in development, that is, OFDM signal peak power ratio is large, it is easy to lead to OFDM signal intermodulation distortion and system performance degradation. Therefore, how to reduce the peak-to-average power ratio of OFDM signal has been a hot topic in OFDM technology. In this paper, the SLM and PTS algorithms for reduc
Platform: | Size: 142336 | Author: num113 | Hits:

[matlabFSK

Description: 数字频带通信系统 输入:首先输入模拟信号,给出此模拟信号的时域波形。 数字化:将模拟信号进行数字化,得到数字信号,可以选择PCM编码。 调制:可以选择简单的二进制数字调制方式。例如振幅键控(2ASK)、相移监控(2PSK)、频移键控(2FSK)、差分相移键控(DPSK)等。要求每个题目至少选择两种调制方式。有能力的同学也可以选择其它高效的调制方式例如多进制数字振幅键控等给出调制后信号的时域波形。 信道:假定信道属于加性高斯信道或自行设计。 解调:相应的2ASK、2PSK、2FSK、DPSK解调,仿真获得解调输出波形。 PCM解码:给出解码后的模拟信号的时域波形,并与输入信号进行比较。 系统性能分析:比较在不同调制方式下,该数字频带传输系统的性能指标,即该系统的输出误码率随输入信噪比的变化曲线。(Digital frequency band communication system)
Platform: | Size: 2048 | Author: 流星问月 | Hits:

[Communication-MobileQPSK&OFDM

Description: 基于 MATLAB 对移动通信中的 BPSK、QPSK、16QAM 和 OFDM 基带传输系统进行仿真,分析它们在 AWGN 和 Rayleigh 信道下的误码率性能。重点建立了基于 QPSK 和 16QAM 调制方式下 OFDM 系统的仿真,比较两种调制方式在 Rayleigh 信道下的传输性能,分析了系统模型,提出了代码优化方案。(Based on MATLAB, we simulate the BPSK, QPSK, 16QAM and OFDM baseband transmission systems in mobile communications, and analyze their BER performance under AWGN and Rayleigh channels. The simulation of OFDM system based on QPSK and 16QAM modulation is mainly established. The transmission performance of two modulation modes under Rayleigh channel is compared, the system model is analyzed, and the code optimization scheme is put forward.)
Platform: | Size: 5120 | Author: yellow17 | Hits:

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