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2008 11th IEEE Singapore International Conference on Communication Systems最新文献

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Performance of STBCs with Linear Maximum Likelihood Decoder in time-selective channels 带线性最大似然解码器的stbc在时间选择信道中的性能
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-12-01 DOI: 10.1109/ICCS.2008.4737272
G. Villardi, G. D. de Abreu, R. Kohno
{"title":"Performance of STBCs with Linear Maximum Likelihood Decoder in time-selective channels","authors":"G. Villardi, G. D. de Abreu, R. Kohno","doi":"10.1109/ICCS.2008.4737272","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737272","url":null,"abstract":"We present the bit error rate (BER) analyses of orthogonal space-time block codes (O-STBCs) and their modified version (MO-STBCs), with linear maximum likelihood decoder (LMLD) over uncorrelated and time-selective fading channels of generalized statistics. First, we quantify the effective diversity achieved by O-STBCs and MO-STBCs by resorting to a statistical characterization of the diversity gain of both schemes with LMLD. Finally, we expand the theoretical BER expressions of O-STBCs, derived for the block fading channels, to MO-STBCs with LMLD in a more practical time-selective fading channel with Gray code mapped M-ary PSK and M-ary QAM modulations.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"284 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132113470","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
A subcarrier-phase control based peak power reduction method for coded space division multiplexed OFDM systems 一种基于子载波相位控制的编码空分复用OFDM系统峰值功率降低方法
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-12-01 DOI: 10.1109/ICCS.2008.4737346
O. Muta
{"title":"A subcarrier-phase control based peak power reduction method for coded space division multiplexed OFDM systems","authors":"O. Muta","doi":"10.1109/ICCS.2008.4737346","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737346","url":null,"abstract":"In this paper, we propose a sub-carrier phase control based peak power reduction (PPR) method for a turbo-coded space division multiplexed orthogonal frequency division multiplexing (SDM-OFDM) system. The PPR method is an extended version of the existing partial-transmit sequence (PTS), where the same numbered cluster signals at different antenna elements are weighted by the same weighting factors (WFs) and PAPR of OFDM signal is reduced by adjusting the phase of each cluster signal by multiplying WFs so as to minimize PAPR of OFDM signals. On the receiver side, WF estimation and error correction are jointly performed with turbo decoding, where WFs are estimated by exploiting the decoding results of two data streams passing through different channel in SDM-OFDM systems. When the PPR method using 9 clusters is applied to 64-QAM OFDM signal, instantaneous power of the transmit signal at the CCDF of 10-4 can be reduced by about 1.9 dB. In addition, when a peak limiter is applied to 64QAM-OFDM system using the PPR method, instantaneous power at the CCDF of 10-4 is reduced by about 3.1 dB as compared to case without any peak power reduction, while the proposed method achieves almost the same block error rate (BLER) performance in attenuated 12-path Rayleigh fading condition.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128569630","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
Antenna/sampling point selection algorithm in fractional sampling-MIMO-OFDM 分数阶采样- mimo - ofdm中的天线/采样点选择算法
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-12-01 DOI: 10.1109/ICCS.2008.4737216
H. Higuchi, H. Nishimura, Y. Sanada
{"title":"Antenna/sampling point selection algorithm in fractional sampling-MIMO-OFDM","authors":"H. Higuchi, H. Nishimura, Y. Sanada","doi":"10.1109/ICCS.2008.4737216","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737216","url":null,"abstract":"MIMO-OFDM systems are expected to realize higher data rates and larger capacity. With more transmit and receive antennas the capacity of MIMO-OFDM systems increases. However, when the number of demodulators is limited, it is essential to select antenna points which achieve selection diversity. On the other hand, through Fractional Sampling (FS), it is possible to separate multipath components and obtain diversity gain. Just like MIMO systems, FS achieves selection diversity by selecting sampling points. This paper presents an antenna/sampling point selection algorithm for MIMO-OFDM systems with Fractional Sampling. Utilizing the characteristics of the correlation among the sampling points in FS, the proposed selection algorithm offers significantly lower computational complexity than conventional algorithms. The proposed algorithm is confirmed through the computational simulations.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131814535","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
Fractional sampling OFCDM with alternative spreading code 具有可选扩频码的分数采样OFCDM
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-12-01 DOI: 10.1109/ICCS.2008.4737412
M. Inamori, N. Haruki, Y. Sanada, M. Ghavami
{"title":"Fractional sampling OFCDM with alternative spreading code","authors":"M. Inamori, N. Haruki, Y. Sanada, M. Ghavami","doi":"10.1109/ICCS.2008.4737412","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737412","url":null,"abstract":"Orthogonal frequency and code division multiplexing (OFCDM) has received large attention as a modulation scheme to realize high data rate transmission. In this paper, the OFCDM system with fractional sampling (FS) is investigated. FS is a diversity scheme with a single antenna, which achieves path diversity through oversampling and parallel signal reception. However, the correlation among noise components may deteriorate the bit error rate (BER) performance at the receiver as the number of subcarriers and oversampling ratio increase. To overcome this problem, the alternative spreading code is used for the FS OFCDM system. Numerical results through computer simulation show that the proposed scheme can improve the performance of the receiver with the large oversampling ratio and the number of subcarriers.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134646261","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
Traffic pattern prediction in cellular networks 蜂窝网络中的流量模式预测
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-11-01 DOI: 10.1109/ICCS.2008.4737244
Kejing Zhang
{"title":"Traffic pattern prediction in cellular networks","authors":"Kejing Zhang","doi":"10.1109/ICCS.2008.4737244","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737244","url":null,"abstract":"Early detection and rapid resolution network congestion can considerably improve network capacity. Consequently, much research has been carried out on predicting traffic patterns in 3G networks. This paper introduces an access point centric approach implemented based on the order-k Markov model. The feasibility of this order-k Markov predictor is evaluated, and the prediction performance of predictors with different order values is compared. Finally, we conclude that the order-4 Markov model is competent for both the one-step-ahead and multi-step-ahead traffic pattern predictions.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115166065","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
Uneven pilot-assisted channel estimation method for mobile OFDM systems 移动OFDM系统非均匀导频辅助信道估计方法
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-11-01 DOI: 10.1109/ICCS.2008.4737348
D. Li, S. Feng, W. Ye, H. Zhuang
{"title":"Uneven pilot-assisted channel estimation method for mobile OFDM systems","authors":"D. Li, S. Feng, W. Ye, H. Zhuang","doi":"10.1109/ICCS.2008.4737348","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737348","url":null,"abstract":"This paper proposes an uneven pilot-assisted channel estimation (CE) technique for OFDM systems in mobile environments. We find that the prerequisites of most previous studies are using an equal spaced pilots pattern and sample-spaced channels. This is not the case in practical systems. According to conventional pilot-assisted estimators, we develop an improved channel estimation method based on the criteria of least square (LS) for IEEE 802.16e OFDM systems. In this practical system, pilots are not evenly inserted in the frequency band and the non-sample-spaced multipath delay leads to channel impulse response (CIR) leakage in the time domain. The proposed uneven pilot-assisted CE method is conducted in the frequency domain and it uses a linear model to approximate the time-varying characteristic of CIR in the frequency domain during each OFDM symbol. Analysis and simulations demonstrate its low computational complexity, good performance and practicability in actual OFDM systems.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115318920","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
Distributed contention avoidance in Optical Burst-Switched ring networks 光突发交换环网中的分布式争用避免
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-11-01 DOI: 10.1109/ICCS.2008.4737279
J. Triay, C. Cervelló-Pastor
{"title":"Distributed contention avoidance in Optical Burst-Switched ring networks","authors":"J. Triay, C. Cervelló-Pastor","doi":"10.1109/ICCS.2008.4737279","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737279","url":null,"abstract":"Optical burst switching (OBS) is a promising technology for future optical networks. Due to its less complicated implementation using current optical and electrical components, OBS is seen as the first step towards the future optical packet switching (OPS). Regarding network topologies, the ring is extensively used on current metropolitan environments, and this does not seem it will change in the foreseeable future. In this paper we propose a new medium access protocol for optical burst-switched networks over metropolitan rings that enables the nodes to access the channel in a distributed way. This new protocol avoids burst blockings in transit nodes, turning itself into an efficient and simple burst contention avoidance mechanism. The use of this protocol maximizes the throughput of the network without deteriorating excessively other parameters such as end-to-end delay or ingress queues.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115490112","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
A new Call Admission and Medium Access Control framework for multimedia traffic over GEO satellite networks 地球同步轨道卫星网络多媒体业务的一种新的呼叫接纳和媒体访问控制框架
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-11-01 DOI: 10.1109/ICCS.2008.4737314
P. Koutsakis
{"title":"A new Call Admission and Medium Access Control framework for multimedia traffic over GEO satellite networks","authors":"P. Koutsakis","doi":"10.1109/ICCS.2008.4737314","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737314","url":null,"abstract":"The burstiness of multimedia traffic and the long propagation delays in Geosynchronous (GEO) satellite systems call for an efficient Medium Access Control (MAC) protocol and an equally efficient Call Admission Control (CAC) scheme, in order to provide acceptable Quality of Service (QoS) to multimedia users. This paper proposes a fair and dynamic CAC and MAC framework, named Fair Predictive Resource Reservation Access (FPRRA), which is based on accurate videoconference traffic prediction and makes decisions after taking into account the provider revenue. The framework¿s performance is evaluated in comparison to other efficient schemes from the literature.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124410007","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
Adaptive aggregation flow measurement on high speed links 高速链路上的自适应聚合流量测量
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-11-01 DOI: 10.1109/ICCS.2008.4737246
Guang Cheng, J. Gong
{"title":"Adaptive aggregation flow measurement on high speed links","authors":"Guang Cheng, J. Gong","doi":"10.1109/ICCS.2008.4737246","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737246","url":null,"abstract":"While network traffic may be characterized by many different criteria, it is ease to aggregate traffic along one dimension at a time. Unfortunately, by aggregating traffic along any single dimension, the network manager inevitably loses some interesting information. While the network manager can expose this structure by using finer grained representations, such as flows, he then must manage the excessive detail contained in such a representation. We define our traffic clusters in terms of the five fields typically used to define a fine-grained flow: source IP address, destination IP address, protocol, source port and destination port. Unlike others flow monitoring methods, such as NetFlow and ANF, we only keep the heavy-tailed flows and sampled short flows on a non-uniform sampling method with the flow length. The aggregation traffic can be estimated by these sampled flows and can keep the estimated accuracy at the same time. Experiment studies show our approach can significantly improve both the accuracy and efficiency in network aggregation flow monitoring comparing to other existing approaches.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123102086","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
Efficient mobile WiMAX capacity estimations in a multihop environment 多跳环境下高效移动WiMAX容量估计
2008 11th IEEE Singapore International Conference on Communication Systems Pub Date : 2008-11-01 DOI: 10.1109/ICCS.2008.4737460
F. Gordejuela-Sanchez, D. López-Pérez, Jie Zhang, Liqiang Zhao
{"title":"Efficient mobile WiMAX capacity estimations in a multihop environment","authors":"F. Gordejuela-Sanchez, D. López-Pérez, Jie Zhang, Liqiang Zhao","doi":"10.1109/ICCS.2008.4737460","DOIUrl":"https://doi.org/10.1109/ICCS.2008.4737460","url":null,"abstract":"The new relay-based architecture for mobile WiMAX that will allow multihop communication imposes a demanding performance requirement on relay stations. The frame structure used for transmission plays an important role in the design of multihop networks as it manages the channel access and therefore determines the resulting network capacity. In this work we firstly propose a new simple and flexible concept to integrate multihop communications into the mobile WiMAX frame structure and compare this method with other basic concepts already proposed for the upcoming IEEE 802.16j release of the standard. Secondly, we introduce efficient capacity calculations that will allow intensive system level simulations in a mobile WiMAX multihop environment for the purpose of network design. Finally, network capacity is evaluated within a new simulation model for various configurations and services allowing interesting observations about WiMAX radio efficiency. Numerical results and discussion highlight the advantages and drawbacks of the selected strategies and provide a deeper understanding on the range extension aspect of a relay network.","PeriodicalId":208126,"journal":{"name":"2008 11th IEEE Singapore International Conference on Communication Systems","volume":"84 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121234429","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: 10
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