共查询到18条相似文献,搜索用时 109 毫秒
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The influence of stimulated Raman scattering (SRS) taking into account the random modulation and the walk-off effect on wide-band wavelength division multiplexing (WDM) transmission systems are studied theoretically. First, it is shown that power depletion due to SRS can be separated into average power loss and waveform distortion. The waveform distortion is evaluated for various types of pulse shapes and fibers, and simple equations for evaluating the waveform distortion due to SRS are derived. These equations can be easily applied for designing wide-band WDM transmission systems from the viewpoint of the SRS waveform distortion. We also compare results obtained from our method with those from the split-step Fourier method, and confirm validity of our method. Our method should be useful in the design of wide-band WDM transmission systems, in which SRS is expected to be a serious limitation 相似文献
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利用波长变换技术来消除WDM光通信系统中的SRS串扰 总被引:1,自引:0,他引:1
文章主要介绍了光通信系统中波长变换技术的发展现状,从而引入它来消除波分复用系统中受激拉曼散射(SRS)的串话影响。文章首先建立一个用来消除SRS串扰的仿真模型,再利用频谱的对称反转分布技术来消除SRS串话,最后进行了maltlab仿真,结果表明这一途径是可行的。但是此次的仿真系统是在忽略色散的条件下,所以还需进一步的研究。 相似文献
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在实际TD-LTE-Advanced系统中,针对非理想SRS信道,结合SRS信道估计误差的理论,建立SRS信道估计误差的模型,深入研究SRS误差对MIMO的性能影响。仿真分析显示,存在SRS误差的实际信道对协作多点传输(CoMP)有较大影响,但是相对其他基于波束赋形的MIMO模式仍能保证较高的增益。文章的研究工作分析非理想信道估计对系统性能的影响,并评估非理想SRS信道下多种MIMO模式的系统性能。 相似文献
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在LTE-V2X(long term evolution-vehicle to everything)系统中,存在部分车载用户无法获取基站的同步参考信号(synchronization reference signal,SRS),从而无法与网络进行通信的问题。为解决这一问题,提出一种副链接(sidelink,SL)空口同步方案。车载用户根据SRS优先级划分机制选择最优的SRS,同时可获取该SRS的优先级以及确定自身发送SRS的优先级;并设计SRS时移传输机制使得不同优先级SRS在不同时帧上传输来区分优先级,与此同时还可有效抑制同频干扰。仿真结果显示,该方案在同步源优先级为 4 个等级时,同步定时误差均满足车载用户的同步需求。本文所提方案不仅扩大了空口同步范围,还可以有效抑制车载用户之间的同频干扰,可作为LTE-V2X系统实现有效可行的空口同步方案之一。 相似文献
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Pilot two-way CATV systems have been mounted in the United States largely to assess the marketability of various interactive services (e.g., subscriber response) and to assess technical problems over operating CATV systems. Such tests were at their peak in the early 1970's. Twelve systems which have been publicly tested are considered briefly. Three of these, the Theta-Com subscriber response system (SRS), the Coaxial Scientific Telecinema system, and the MITRE MITRIX system, are considered in some detail. 相似文献
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