Proceedings. IEEE Symposium on Computers and Communications最新文献_第2页

Combined permutation codes using M-ary modulation for AWGN and fading channels AWGN和衰落信道中使用M-ary调制的组合排列码

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523688

J. Rahhal, G. Atkin

引用次数: 1

Majority Manchester decoding for active redundant data transmission 大多数曼彻斯特解码为主动冗余数据传输

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523650

T. Sauter, N. Kerö

引用次数: 4

Coding to relax laser linewidth requirements for multichannel CPFSK coherent optical communications 编码放宽多通道CPFSK相干光通信的激光线宽要求

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523685

Jyh-Horng Wu, Jingshown Wu, Yang-Han Lee

引用次数: 0

On the multiplexing effects of the ATM traffic ATM业务的多路复用效应

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523651

Lily Cheng, H. Hughes

引用次数: 3

On improving voice quality under dynamic encoding algorithms in ATM networks 基于动态编码算法提高ATM网络语音质量的研究

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523176

I. Rubin, Kirk K. Chang

{"title":"On improving voice quality under dynamic encoding algorithms in ATM networks","authors":"I. Rubin, Kirk K. Chang","doi":"10.1109/SCAC.1995.523176","DOIUrl":"https://doi.org/10.1109/SCAC.1995.523176","url":null,"abstract":"We consider a voice multiplexer which supports ATM packet voice traffic. This system model also applies to the multiplexing operation carried out at the output queue of each output queueing ATM switch. The voice multiplexer implements an encoding algorithm under which the voice quantization levels are dynamically adjusted according to the congestion status of the multiplexer. Using an embedded voice encoding scheme, a voice packet is encoded into lower and higher priority ATM cells. When high congestion conditions are observed, lower priority voice cells (which contain the least significant bits) are discarded. In previous studies, the voice quality under a dynamic encoding algorithm has been described by the long-term average voice encoding rate (AER/sub /spl infin//). Due to the strong correlation properties exhibited by the packet voice traffic, the voice degradation levels incurred under the employed dynamic voice encoding algorithms are not distributed uniformly among the voice sources. As a result, the encoded voice stream for a source can exhibit severe short-term voice quality degradation, while the long-term AER/sub /spl infin// level remains satisfactory. To correct this situation, we introduce in this paper a \"probabilistic\" component in the cell-discarding process. A voice degradation indicator (VDI) is introduced to measure the short-term voice quality degradation experienced by a voice stream. Through numerical examples, we identify and compare the system performance under the deterministic and probabilistic algorithms. Under the same AER/sub /spl infin// levels, a probabilistic algorithm is shown to yield better short-term voice quality behavior as well as to improve the mean cell waiting time performance.","PeriodicalId":90699,"journal":{"name":"Proceedings. IEEE Symposium on Computers and Communications","volume":"46 1","pages":"9-15"},"PeriodicalIF":0.0,"publicationDate":"1995-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76728370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Block coded modulation based ARQ schemes with blocks combining 基于分组编码调制的分组合并ARQ方案

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523686

A. Al-Sanie

引用次数: 0

Multicasting in interconnected networks 互联网络中的多播

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523683

Osman ZeinElDine, H. Abdel-Wahab

{"title":"Multicasting in interconnected networks","authors":"Osman ZeinElDine, H. Abdel-Wahab","doi":"10.1109/SCAC.1995.523683","DOIUrl":"https://doi.org/10.1109/SCAC.1995.523683","url":null,"abstract":"The state of the art in reliable multicasting protocols renders itself inadequate for group multicasting in environments where both intra-group and inter-group messages bridge several LANs. A particularly difficult situation arises if some LANs are managed by autonomous authorities. If autonomy is upheld, as a defacto condition, then LANs under different authorities can adopt different ordering criteria for group multicasting. The accommodation of heterogeneous ordering criteria is a problem that has been largely ignored. The authors propose the multi-LAN multi-order (MLMO) protocol, which supports a reliable ordered delivery service for both local and global messages. The MLMO protocol assumes an environment in which multicasting groups can have members belonging to different LANs, and each group can adopt either total or causal order for message delivery to its members. Characteristic to the protocol is a communication structure that can be aligned with the actual routing topology; thus, the number of necessary protocol messages is maintained. Furthermore, groups that adopt causal order are not forced to experience message latency solely because of coexisting groups that adopt total order.","PeriodicalId":90699,"journal":{"name":"Proceedings. IEEE Symposium on Computers and Communications","volume":"58 1","pages":"313-319"},"PeriodicalIF":0.0,"publicationDate":"1995-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77745375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Transfer of data over ATM networks using available bit rate (ABR) 利用可用比特率(ABR)在ATM网络上传输数据

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523175

G. Konstantoulakis, G. Stassinopoulos

引用次数: 5

Ordered Delivery over One-way Virtual Circuits 单向虚拟电路上的有序交付

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523654

J. Cobb, M. Gouda

引用次数: 1

Performance limitations of multiwavelength interoffice ring networks 多波长局间环网的性能限制

Proceedings. IEEE Symposium on Computers and Communications Pub Date : 1995-06-27 DOI: 10.1109/SCAC.1995.523684

A. Elrefaie

{"title":"Performance limitations of multiwavelength interoffice ring networks","authors":"A. Elrefaie","doi":"10.1109/SCAC.1995.523684","DOIUrl":"https://doi.org/10.1109/SCAC.1995.523684","url":null,"abstract":"Summary form only given. SONET technology has made high speed self-healing ring architectures practical and economical for interoffice network applications. Self-healing ring networks using electronic add-drop multiplexers (SONET ADMs) are limited in capacity to about 10 Gb/s by the electronics. Elrefaie (1993) proposed a multiwavelength interoffice ring architecture for high capacity transport applications. Two types of multiwavelength ring have been proposed: one uses two fibers and the automatic protection switching capability of standard uni-directional SONET ADMs; the other uses four fibers together with a new capability for automatic protection using optical switching and uni-directional SONET ADMs. Both can be designed to be consistent with present SONET standards, allowing graceful upgrades from electronic SONET rings to multiwavelength SONET rings. In multiwavelength interoffice ring networks, WDM signals traverse a cascade of erbium-doped fiber amplifiers (EDFAs), each followed by optical drop-and-insert multiplexers. The amplifiers' non-flat gain spectra impose size and capacity limits that depend on the network types and the specific drop-and-insert arrangements of the network. Also, WDM signals pass through a number of concatenated optical filters which leads to network performance degradations due to laser and filter passband misalignments arising from device imperfections and temperature variations. The paper evaluates the accumulation of performance degradations in multiwavelength interoffice ring networks. The author also suggests several techniques to overcome performance degradations of multiwavelength networks.","PeriodicalId":90699,"journal":{"name":"Proceedings. IEEE Symposium on Computers and Communications","volume":"20 1","pages":"327-"},"PeriodicalIF":0.0,"publicationDate":"1995-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80092361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1