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2006 Asia-Pacific Conference on Communications最新文献

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MIMO Channel Estimator with Consideration of Time Domain Correlation in Flat Fading 考虑平坦衰落时域相关的MIMO信道估计
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255939
Junhui Zhao, Dong Yan
{"title":"MIMO Channel Estimator with Consideration of Time Domain Correlation in Flat Fading","authors":"Junhui Zhao, Dong Yan","doi":"10.1109/APCC.2006.255939","DOIUrl":"https://doi.org/10.1109/APCC.2006.255939","url":null,"abstract":"Channel estimation approaches with training data for multiple-input multiple-output (MIMO) systems in flat fading wireless environment are investigated in this paper. These techniques exploit the correlation of MIMO channel in the time domain when the channel varies very slowly or varies fast with prominent Doppler shift, and obtain channel estimation algorithms by superimposing designed filters to improve those classical estimations' performance. In order to analyze and simulate the performance of these algorithms, investigation on the formulation of those classical estimation errors is also given. Simulation results illustrate that the performance difference between the proposed approaches and the classical ML (or LS, equivalently) estimation, which does not consider the correlation in the time domain","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130234063","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
Self-Matched Miniature Antenna for WLAN 无线局域网自匹配微型天线
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255881
Dong-jin Kim, Youngmin Moon, Se‐Hyun Park, Young-Eil Kim, K. Min
{"title":"Self-Matched Miniature Antenna for WLAN","authors":"Dong-jin Kim, Youngmin Moon, Se‐Hyun Park, Young-Eil Kim, K. Min","doi":"10.1109/APCC.2006.255881","DOIUrl":"https://doi.org/10.1109/APCC.2006.255881","url":null,"abstract":"A miniature monopole antenna for W-LAN (IEEE 802.11b) is presented in this paper. The antenna design concept is based on lambda/8 folded monopole antenna with self-impedance matching structure. A size of the proposed antenna is smaller than the resonant length, thus the impedance at the terminal of antenna becomes reactive. To compensate the impedance miss-matching, the proposed antenna is employed a novel self-impedance matching structure. The self-impedance matching structure is located on the top of antenna; it improves the impedance matching and ultimately the efficiency of antenna","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130285825","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
Generalized Modified Accelerative Pre-allocation WDMA MAC Protocol for WDMA Networks WDMA网络的广义改进加速预分配WDMA MAC协议
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255887
Changho Yun, Tae-Sik Cho, Youngtae Noh, Kiseon Kim
{"title":"Generalized Modified Accelerative Pre-allocation WDMA MAC Protocol for WDMA Networks","authors":"Changho Yun, Tae-Sik Cho, Youngtae Noh, Kiseon Kim","doi":"10.1109/APCC.2006.255887","DOIUrl":"https://doi.org/10.1109/APCC.2006.255887","url":null,"abstract":"For wavelength division multiple access (WDMA) networks, various media access control (MAC) protocols have been proposed. In this paper, generalized modified accelerative pre-allocation WDMA (GMAP-WDMA) is proposed, which is based on MAP-WDMA considering channel sharing at channel limited conditions. The network performance of channel utilization, throughput, and latency is analyzed under balanced traffic loads and uniform traffic distribution by employing neighboring channel sharing. As a result, the performance of GMAP-WDMA mainly depends on the number of channels at given number of stations, and their behaviors can be applied to practically design the network","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129260725","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
Increasing Bandwidth Dual Frequency Triangular Microstrip Antenna Feed By Coplanar Waveguide 用共面波导增加双频三角形微带天线馈电带宽
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255851
I. Surjati, E. Rahardjo, D. Hartanto
{"title":"Increasing Bandwidth Dual Frequency Triangular Microstrip Antenna Feed By Coplanar Waveguide","authors":"I. Surjati, E. Rahardjo, D. Hartanto","doi":"10.1109/APCC.2006.255851","DOIUrl":"https://doi.org/10.1109/APCC.2006.255851","url":null,"abstract":"The narrow bandwidth of microstrip antenna is one of the important features that restrict its wide usage. This paper presents a bandwidth enhancement technique using coplanar waveguide. A new design of coplanar waveguide feed line for dual frequency triangular microstrip antenna to increasing the bandwidth is proposed and experimentally studied. The two resonant frequencies can be generated by controlling the distance between the two slits. Return loss of -25.31 dB for the first resonant frequency 3.01 GHz and return loss of -23.51 dB for the second resonant frequency 3.96 GHz can be achieved at the slit height 12 mm when the distance between the two slits at 5 mm. The measured result show that the proposed antenna have the impedance bandwidth of 27.26% (VSWR<2) and the two frequencies having the similar broadside radiation characteristics","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121616605","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
The Concept of Referential Loss Recovery for Real-Time Applications and its Improvements of QoS Provision 实时应用中参考损失恢复的概念及其对QoS提供的改进
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255878
M. Hayasaka, T. Manodham, T. Miki
{"title":"The Concept of Referential Loss Recovery for Real-Time Applications and its Improvements of QoS Provision","authors":"M. Hayasaka, T. Manodham, T. Miki","doi":"10.1109/APCC.2006.255878","DOIUrl":"https://doi.org/10.1109/APCC.2006.255878","url":null,"abstract":"Real-time multimedia streaming is expected to grow rapidly in the near future. Packet losses during transmission are a serious problem for these multimedia applications since they result in degradation of the quality of service (QoS). Forward error correction (FEC) is a promising technique to recover the lost packets and improve the QoS of streaming media. However, FEC may degrade the QoS of all streaming due to the increased congestion caused by FEC overhead when streaming sessions increase. In this paper, a novel FEC method that avoids the adverse effect of FEC overhead during media streaming is proposed. Also, we define the maximum percentage of network load where FEC can improve the packet loss ratio to clarify the effective ranges where each FEC and automatic repeat request (ARQ) scheme works well. The numerical analyses show that our proposed method highly improves the packet loss ratio compared to conventional method","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125734712","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: 4
A Hybrid Inter-cell Interference Mitigation Scheme for OFDMA based E-UTRA Downlink 基于OFDMA的E-UTRA下行链路混合小区间干扰缓解方案
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255780
Jianchi Zhu, Guangyi Liu, Ying Wang, Ping Zhang
{"title":"A Hybrid Inter-cell Interference Mitigation Scheme for OFDMA based E-UTRA Downlink","authors":"Jianchi Zhu, Guangyi Liu, Ying Wang, Ping Zhang","doi":"10.1109/APCC.2006.255780","DOIUrl":"https://doi.org/10.1109/APCC.2006.255780","url":null,"abstract":"For the evolved UTRA (EUTRA), cell edge bit-rate and system throughput become important criteria for the evaluation of the system proposals and requirements on the system performance. Inter-cell interference is the main source of performance degradation for OFDM, especially the data rate of cell edge UEs is severely limited. Many inter-cell interference mitigation schemes are proposed to improve the EUTRA performance, especially the active coordination in the frequency domain resource allocation between neighboring cells. But they can't achieve robust performance for system throughput and cell edge bit rate when the traffic load varies much. In this paper a hybrid inter-cell interference mitigation scheme (HICIM) is proposed, which is a trade-off between system throughput and cell-edge UE performance. From the simulation results when proportional fairness (PF) scheduling is adopted in single input and single output (SISO) environment, the proposed HICIM scheme achieves robust performance of both system throughput and cell-edge UE performance for both high system load and low system load","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116681010","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: 13
Demultiplexing Heterogeneous ON/OFF Streams 异构ON/OFF流解复用
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255769
H. Huang, R. Mondragón
{"title":"Demultiplexing Heterogeneous ON/OFF Streams","authors":"H. Huang, R. Mondragón","doi":"10.1109/APCC.2006.255769","DOIUrl":"https://doi.org/10.1109/APCC.2006.255769","url":null,"abstract":"The changes of the statistical characteristics of LRD and SRD packet traffic streams, which pass across a multiplexer-queue-demultiplexer (MUX/DEMUX), are investigated. The results show that the tail distribution and the correlation structures of the ON/OFF streams have been changed by the MUX/DEMUX network. Furthermore, depending on the statistical characteristics of the input traffic, the demultiplexed traffic can be LRD with exponential decay in its ON and OFF sojourn times. This observation challenges established beliefs, and implies that LRD is not necessarily a direct consequence of heavy-tailed ON/OFF sojourn times","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121659222","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
Next generation IP Router architecture using SFQ technology 下一代IP路由器架构采用SFQ技术
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255796
N. Miyaho, A. Yamazaki, T. Sakurai, K. Miyahara
{"title":"Next generation IP Router architecture using SFQ technology","authors":"N. Miyaho, A. Yamazaki, T. Sakurai, K. Miyahara","doi":"10.1109/APCC.2006.255796","DOIUrl":"https://doi.org/10.1109/APCC.2006.255796","url":null,"abstract":"An innovative IP router architecture from the viewpoint of minimum switching delay, switching capacity, QoS assurance for the next generation Internet services is proposed. We examined the IP router performance using superconductor device simulator. For the evaluation of a novel IP switch architecture, we effectively apply the SFQ circuits using Josephson junctions to an extremely restricted function block in the switching node and a conventional semiconductor technology is also applied for the rest parts of the other function blocks inside it. We designed frame compression circuits and investigated their behavior by computer simulation using \"WinS\". We assumed the NEC's standard fabrication process of Nb junction LSI. The simulation results show that the bias current margin of the input shift register, and control circuit is plusmn55%, and plusmn33%, respectively. We also confirmed in the simulation that these circuits could be properly operated up to the clock frequency of 22 GHz","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121741440","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: 6
Destination Address Monitoring Scheme for Detecting DDoS Attack in Centralized Control Network 集中控制网络中目的地址监控DDoS攻击检测方案
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255838
S. Shim, Kyoung-Min Yoo, Kyeong‐Eun Han, Chol-Ku Kang, W. So, Jongtae Song, Young-Chon Kim
{"title":"Destination Address Monitoring Scheme for Detecting DDoS Attack in Centralized Control Network","authors":"S. Shim, Kyoung-Min Yoo, Kyeong‐Eun Han, Chol-Ku Kang, W. So, Jongtae Song, Young-Chon Kim","doi":"10.1109/APCC.2006.255838","DOIUrl":"https://doi.org/10.1109/APCC.2006.255838","url":null,"abstract":"As DDoS (distributed denial of service) attack becomes more diversified, the conventional detection methods based on single source router can't detect the attack efficiently. In order to combat this problem, centralized control is required to analyze and collect traffic generated in several source routers. This paper presents defense/detection scenario to protect against DDoS attack in centralized control network. A destination address monitoring scheme is also proposed to detect DDoS attacks in real-time. It measures the number of packets with same destination IP address by using modified Bloom filter. Because the modified Bloom filter uses extra table that manages relation among each address fields of destination IP address, it can reduce wrong detection rate. Simulation result shows the proposed scheme reduces the wrong detection rate than the conventional one","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122737366","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
IQ Cross-talk Compensation in Fading Channels 衰落信道中的IQ串扰补偿
2006 Asia-Pacific Conference on Communications Pub Date : 2006-12-11 DOI: 10.1109/APCC.2006.255904
R. Palipana, Kah-Seng Chung Curtin
{"title":"IQ Cross-talk Compensation in Fading Channels","authors":"R. Palipana, Kah-Seng Chung Curtin","doi":"10.1109/APCC.2006.255904","DOIUrl":"https://doi.org/10.1109/APCC.2006.255904","url":null,"abstract":"This paper discusses IQ cross-talk estimation and compensation in direct-conversion receivers for terrestrial digital video broadcasting (DVB-T). The IQ cross-talk is estimated using the pilots in the frequency domain while the effects of IQ cross-talk are cancelled in time domain. First, IQ cross-talk estimation and cancellation techniques are explained for additive white Gaussian channels. Then the implications of the presence of multi-path fading channels are analyzed. Finally, the effectiveness of the IQ imbalance compensation techniques is evaluated using an end-to-end DVB-T model","PeriodicalId":205758,"journal":{"name":"2006 Asia-Pacific Conference on Communications","volume":"202 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123034979","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
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