共查询到18条相似文献,搜索用时 57 毫秒
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由于WDM网络中的传输和交换是以波长为粒度进行的。因此波长分配算法就成为光网络的研究热点。有效的算法可大大提高波长的利用率,并可充分挖掘WDM的带宽资源。介绍了WDM全光网络中静态和动态波长分配算法,尤其是结合大型网孔网络详述了几种动态波长分配算法。针对波长变换器在全光网络中的应用。提出了一种可以解决任意类型光网络的分层图算法,它可以一次性解决路由选择和波长分配问题,大大提高了该算法的效率。是未来光网络中非常有前景的一种波长分配算法。 相似文献
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一种求解虚波长路径光网络波长资源优化问题的启发式算法 总被引:1,自引:0,他引:1
本文提出了一种虚波长路径光网络的启发式路由选择算法,它可以用来解决以最小化网络所需波长数目为目标的资源优化问题.该算法应用了基于最大概率路径的选路优化策略.对一个样例网络的数值分析结果表明该算法是有效的. 相似文献
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研究不同的路由和波长分配(RWA)方法对无波长变换WDM网络P圈优化性能的影响.提出了用负载均衡的方法对各波长层的工作容量进行均衡,以降低网络总容量.分别研究了动态分层通用RWA(DL-GRWA)、最短路径RWA(SP-RWA)、动态分层负载均衡(DL-LB)、最短路径负载均衡(SP-LB)、固定波长负载均衡(FW-LB)5种方法对网络总容量的影响.仿真发现,无论何种RWA方法,随着圈最大跳数限制的变大,网络总容量都逐渐降低,其中SP-LB方法所需要的网络总容量最小. 相似文献
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针对可利用的有限信道波长数对基于单纤连接节点的WDM星形单跳网容量限制问题,本文提出了一种有效的解决方案-波长重用.根据该方案,在信道波长数一定的条件下,至少可使网络所支持的节点数-网络容量扩大一倍;在网络节点数不变时,则可大大减少网络节点的排队时延,缓和网络中各通信节点对数据信道波长使用权的竞争矛盾,使网络吞吐量增加1~3倍,有效地改善网络性能.本文首先论述了该基于单纤连接节点的波长重用WDM星形单跳网结构,接着分析了网络的波长重用特性,进而对所要求的光放大器增益和输出功率进行了计算;最后计算了网络的最大节点数和最大信道波长数. 相似文献
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In this article , we studied the associated research problems and challenges on routing and wavelength assignment (RWA) in WDM (wavelength division multiplexing) networks. Various RWA approaches are examined and compared.We proposed a new RWA algorithm based on multi-objective. In this new algorithm, we consider multiple network optimizing objectives to setup a lightpath with maximize profit and shortest path under the limited resources. By comparing and analyzing, the pro posed algorithm is much better than the algorithms, which only consider one optimizing objective. 相似文献
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1 Introduction AlongwiththegreatdevelopmentofWDMapplications ,thewavelengthselectivephotodetectionisbeneficialtotheopticalfibercommunication .Uptodate ,therehavebeenmanykindsofwavelengthselectivephotoreceiversthatarebeingappliedforsuchapurpose .Theyareu… 相似文献
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Abstract In this article, two static routing algorithms have been proposed and compared to some of the existing algorithms on the basis of blocking probability. The two proposed static routing and wavelength assignment algorithms reduce the blocking probability to maximize the utilization of the network. All of these algorithms are analyzed and compared with four wavelength assignment schemes, which are first-fit, random, most used, and least used. It is shown that our proposed static algorithms give the best performance for first-fit wavelength assignment and most used wavelength assignment strategies with reduced complexity. For least used wavelength assignment and random wavelength assignment, 1 fixed and 2 alternate routing algorithm gives the lowest blocking probability. 相似文献
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In order to content with forward error correction (FEC) technology of the high-speed optical communication system, a new simple decoding algorithm for triple-error correcting Bose, Chaudhuri, and Hocquenghem (BCH) code is proposed. Without complicated matrix-operation or division-operation or intricate iterative algorithm, the algorithm is high efficient and high-speed because of its simplicity in structure. The result of hardware emulation confirms that the algorithm is feasible completely. Introduction of the parallel structure increases the speed of coding greatly. The algorithm can be used in the high-speed optical communication system and other fields. 相似文献
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1 Introduction Moderndigitalcommunicationsystemsoftenrequireerror freetransmission .Errorcontrolcodingtechnologyhasbeenusedwidelyincommunicationsystem .Andithasbeenimprovingtheperformanceofcommunicationsystem greatly ,especiallyinwirelesscommunicationss… 相似文献
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波长共享的WDM无源光网络媒质接入控制算法及其性能分析 总被引:2,自引:2,他引:0
结合波长分配和前跳虚时钟算法,提出了一个基于连接的WDM无源光网络媒质接入控制算法.通过理论和仿真,分析了此算法的延时保证和公平性. 相似文献
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Noemí Merayo Tamara Jiménez Patricia Fernández Ramón J. Durán Rubén M. Lorenzo Ignacio De Miguel 《Fiber and Integrated Optics》2013,32(5):394-419
Abstract A novel bandwidth assignment algorithm in wavelength division multiplexing Ethernet passive optical networks, called a dynamic wavelength assignment service level agreement, is proposed to efficiently provide subscriber differentiation. Simulation results show that the dynamic wavelength assignment service level agreement outperforms other bandwidth allocation algorithms in wavelength division multiplexing Ethernet passive optical networks, as it makes a fairer bandwidth distribution than other methods and is able to overcome the non-allowed packet fragmentation of the Ethernet passive optical network standard. Consequently, it greatly increases the achieved throughput and always ensures a minimum guaranteed bandwidth to every priority subscriber. Furthermore, the new algorithm obtains lower mean packet delay and packet loss rate for the highest priority subscribers when compared with other bandwidth distribution schemes in wavelength division multiplexing Ethernet passive optical networks. 相似文献