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2006 First International Conference on Communications and Networking in China最新文献

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Routing and Wavelength Assignment in WDM Networks with Bounded-Degree Tree and Tree of Rings Topologies 基于有界度树和环树拓扑的WDM网络路由与波长分配
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344755
Shaoqiang Zhang, G. Hou, C. Ding
{"title":"Routing and Wavelength Assignment in WDM Networks with Bounded-Degree Tree and Tree of Rings Topologies","authors":"Shaoqiang Zhang, G. Hou, C. Ding","doi":"10.1109/CHINACOM.2006.344755","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344755","url":null,"abstract":"In all-optical networks that use wavelength division multiplexing (WDM) technique, a challenging problem called the routing and wavelength assignment problem (RWA) is modelled as that connection requests must be assigned paths and wavelengths such that intersecting paths receive different wavelengths, and the goal is to minimize the number of wavelengths used. Besides the tree, another popular network topology is the tree of rings which is obtained by interconnecting rings in a tree structure such that any two rings share at most one node. A polynomial-time optimal algorithm and an approximation algorithm are given for the RWA problem in bounded-degree tree and tree of rings networks, respectively.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129184233","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: 0
Performance of Low-Density Parity-Check (LDPC) Coded OFDM system based on Adaptive Power Allocation Algorithm 基于自适应功率分配算法的低密度奇偶校验编码OFDM系统性能
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344715
Xiaoguang Wu, Zhi Zhang, Jun Jiang, Ping Zhang
{"title":"Performance of Low-Density Parity-Check (LDPC) Coded OFDM system based on Adaptive Power Allocation Algorithm","authors":"Xiaoguang Wu, Zhi Zhang, Jun Jiang, Ping Zhang","doi":"10.1109/CHINACOM.2006.344715","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344715","url":null,"abstract":"A LDPC-COFDM system model based on adaptive algorithm can allocate transmit power and bits among sub-carriers according to the channel gain of each sub-channel. An adaptive power allocation algorithm, which is beneficial for log likelihood ratio decoding of LDPC coded modulation, is proposed in this paper. The simulation results show that the model can effectively improve the bit-error-rate (BER) performance of the system, compared with the traditional OFDM system based on equal power allocation, adapting to the time-variant behavior of the multi-path fading channel.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128822581","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: 5
Parametric Channel Estimation for OFDM Systems in Time-Varying Environment Based on Subspace Projecting and Tracking 时变环境下基于子空间投影与跟踪的OFDM系统参数信道估计
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344742
Liang Dong, Xiuying Cao, G. Bi
{"title":"Parametric Channel Estimation for OFDM Systems in Time-Varying Environment Based on Subspace Projecting and Tracking","authors":"Liang Dong, Xiuying Cao, G. Bi","doi":"10.1109/CHINACOM.2006.344742","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344742","url":null,"abstract":"Channel estimation is critical for coherent detection in OFDM systems. In pilot symbol aided channel estimation methods, the LS channel estimation can be viewed as a noisy observation of the true channel frequency response, so the noise component can be compressed through signal subspace projecting. In this paper, we focus on parametric channel estimation method combined with subspace projecting. First, we estimate the signal space of the OFDM system, and then we can use ESPRIT method to estimate the multipath delay of wireless channel, finally we use subspace projecting to get more accurate channel estimation. When the channel multipath delays vary with time, the signal subspace should be tracked to keep the efficiency of channel estimation. Computer simulations show that the performance of our method is much better than traditional channel estimation methods and its nonparametric counterpart.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116351238","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
Constant-Power Adaptive QAM in High Delay Spread Environments 高时延扩展环境下的恒功率自适应QAM
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344759
X.-h. Shan, G. Bi
{"title":"Constant-Power Adaptive QAM in High Delay Spread Environments","authors":"X.-h. Shan, G. Bi","doi":"10.1109/CHINACOM.2006.344759","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344759","url":null,"abstract":"Constant-power constant-symbol-rate adaptive quadrature amplitude modulation (AQAM) system with four modes is analyzed in high delay spread environments. The ratio of rms delay spread to symbol period is from 0.02 to 0.2. The average bit-error-rate (BER) and throughput are investigated subject to the instantaneous BER constraint and the average BER constraint. Results show that an increase in power or a reduction in delay spread will lead to the increase of the average throughput under the two constraints, whereas they will not necessarily result in a decrease in the average BER under the instantaneous BER constraint. The superiority to individual QPSK mode is investigated in the delay spread immunity at last.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116360921","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: 0
TA-iSLIP: A Traffic Adaptive iSLIP Scheduling Algorithm 一种流量自适应iSLIP调度算法
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344751
Wang Jing-cun, Wang Qin, Xie Xin-ai, Liu Lan-jun, Wang Yue, Fan Yong
{"title":"TA-iSLIP: A Traffic Adaptive iSLIP Scheduling Algorithm","authors":"Wang Jing-cun, Wang Qin, Xie Xin-ai, Liu Lan-jun, Wang Yue, Fan Yong","doi":"10.1109/CHINACOM.2006.344751","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344751","url":null,"abstract":"Today, iSLIP scheduling algorithm is widely employed in high performance switches and routers, but its performance decreases dramatically under the burst traffic. A traffic adaptive algorithm based on iSLIP, TA-iSLIP, which iterates the scheduling decision between slots, is proposed in this paper. To make good use of the matched resources and decrease the system matching overhead, this algorithm intelligently estimates the traffic type using queue length, and then adopts different processing methods accordingly. Simulation results show that TA-iSLIP can achieve high performance under both the uniform and non-uniform traffics.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117012507","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
Novel Optical Filters Configuration for Dispersion Compensation in High-Speed WDM Optical Communication Systems 高速WDM光通信系统中色散补偿的新型滤光器结构
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344819
Ma Yunzhu, Li Zhengbin, Xu Anshi
{"title":"Novel Optical Filters Configuration for Dispersion Compensation in High-Speed WDM Optical Communication Systems","authors":"Ma Yunzhu, Li Zhengbin, Xu Anshi","doi":"10.1109/CHINACOM.2006.344819","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344819","url":null,"abstract":"Two new configuration of optical all-pass filters used for tunable dispersion compensation in high-speed WDM optical communication systems are described, one of which is based on an asymmetry Mach-Zehnder (MZI) and an optical fiber delay line; and the other is based on an asymmetry MZI and a ring resonator. A two-stage device is demonstrated with FSR of 100 GHz, the former structure has a dispersion tuning range of plusmn50 ps/nm,a passband width of 70 GHz,and the group delay ripple less than 2.7 ps. The latter structure has a dispersion tuning range of plusmn100 ps/nm,a passband width of 75 GHz,and the group delay ripple is less than 2.3 ps","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116664469","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
Osmosis in Pocket Switched Networks 口袋交换网络中的渗透
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344671
Pan Hui, Jérémie Leguay, J. Crowcroft, James Scott, T. Friedman, V. Conan
{"title":"Osmosis in Pocket Switched Networks","authors":"Pan Hui, Jérémie Leguay, J. Crowcroft, James Scott, T. Friedman, V. Conan","doi":"10.1109/CHINACOM.2006.344671","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344671","url":null,"abstract":"The increase in the variety and capability of mobile communications devices carried by people today has made it possible to envision a new class of networks called pocket switched networks (PSNs). In a PSN, because the nodes are constantly moving and their communication abilities are limited, the design of networking protocols and applications is challenging. This paper presents a new communications scheme for PSN, called Osmosis, based on the biological phenomenon. We show how this scheme can be applied to file sharing. This scheme uses epidemic routing to perform file lookup and achieves controlled flooding for file transfer. The flooding requires very little state information, which is collected during the lookup. This paper analyzes the performance of Osmosis in simulation studies based on real mobility traces.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115618582","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: 43
A Cross-Layer on-Board Discarding Strategy for Broadband Satellite Communication Networks 宽带卫星通信网的跨层机载丢弃策略
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344639
L. Rong, C. Zhigang
{"title":"A Cross-Layer on-Board Discarding Strategy for Broadband Satellite Communication Networks","authors":"L. Rong, C. Zhigang","doi":"10.1109/CHINACOM.2006.344639","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344639","url":null,"abstract":"In many multimedia broadband satellite systems, asynchronous transfer mode (ATM) technology is advocated to support integrated services. To improve the utilization of on-board buffer resources and satellite downlink, a cross-layer discarding strategy, ECTD (erroneous cell tail drop), has been suggested and theoretically analyzed by the authors. In this paper, ECTD is further studied through simulations. Unlike most other studies that use only one performance metric, we adopt two metrics - goodput and effective throughput, to respectively measure the transmission efficiency of higher-layer packets and downlink utilization. Simulation results show that ECTD could improve the transferring performance of on-board switch in measurement of goodput and effective throughput, and the improvement of effective throughput is much greater than that of Goodput.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"22 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114130280","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: 0
An Algorithm of Large-Scale Approximate Multiple String Matching for Network Security 面向网络安全的大规模近似多字符串匹配算法
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344838
Tian Song, Y. Xue, Dongsheng Wang
{"title":"An Algorithm of Large-Scale Approximate Multiple String Matching for Network Security","authors":"Tian Song, Y. Xue, Dongsheng Wang","doi":"10.1109/CHINACOM.2006.344838","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344838","url":null,"abstract":"Payload checking has become the basic technique for network security applications, where the exact string matching technology is widely used. But as the game between attackers and defenders goes further into payload confusion, the approximate string matching technology is needed, especially large-scale approximate multiple string matching technology. In this paper, we propose one practical algorithm, LargePEX, for large scale approximate multiple string matching based on edit distance. The algorithm is basically extended from PEX, an algorithm of approximate single string matching, with the idea of filtering and verification. LargePEX is finely designed to fit for large-scale matching using fine grain steps analyses. Some experiments are presented to verify the efficiency of LargePEX. As the results show, for the set of 10k strings, the average network payload checking speed using this algorithm can achieve 25 MBps-40 MBps, enough for 100 Mbps Ethernet. With hardware upgrading, the algorithm is also practical for Gigabit Ethernet. So LargePEX provides a new way for defenders to develop more effective methods to protect valuable resources and prevent intrusions by payload checking.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114226749","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: 2
An Improved LSL Interpolator to Suppress Narrow-Band Interference forDirect-Sequence Spread-Spectrum Systems 一种抑制直接序列扩频系统窄带干扰的改进LSL插值器
2006 First International Conference on Communications and Networking in China Pub Date : 2006-10-01 DOI: 10.1109/CHINACOM.2006.344717
Zhiguo Sun, Lili Guo
{"title":"An Improved LSL Interpolator to Suppress Narrow-Band Interference forDirect-Sequence Spread-Spectrum Systems","authors":"Zhiguo Sun, Lili Guo","doi":"10.1109/CHINACOM.2006.344717","DOIUrl":"https://doi.org/10.1109/CHINACOM.2006.344717","url":null,"abstract":"An improved interpolator based on QR-decomposition is proposed to suppress narrow-band interference (NBI) in direct-sequence spread-spectrum (DS/SS) systems. This interpolator is based on the discrepancy in the predictability between NBI and the spread spectrum signal (SS), and then uses a linear interpolation of the received signal to estimate NBI. Because of QR-decomposition operation instead of inverting the correlation matrix and a novel variable with a small dynamic range, the performances of QRD-LSL interpolators outperform ones of LSL predictors and LSL interpolators. It was shown that the QRD-LSL interpolators can obtain more 4 dB processing gain than LSL predictors and LSL predictors, and its total computational complexity scales linearly with the interpolation order.","PeriodicalId":408368,"journal":{"name":"2006 First International Conference on Communications and Networking in China","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114847482","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: 8
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