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The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.最新文献

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High-speed turbo decoding algorithm and its implementation 高速turbo译码算法及其实现
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359420
D. Choi, In-gi Lee, Ji-Won Jung
{"title":"High-speed turbo decoding algorithm and its implementation","authors":"D. Choi, In-gi Lee, Ji-Won Jung","doi":"10.1109/ICCS.2004.1359420","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359420","url":null,"abstract":"In this paper, we propose a high-speed turbo decoding algorithm and present results of its implementation. The latency caused by (de)interleaving and iterative decoding in conventional MAP turbo decoder can be dramatically reduced with the proposed scheme. The main cause of the time reduction is to use radix-4, center to top, and parallel decoding algorithm. The reduced latency makes it possible to use turbo decoder as a FEC scheme in the real-time wireless communication services. However the proposed scheme costs slight degradation in BER performance because the effective interleaver size in radix-4 is reduced to a half of that in conventional method. To ensure the time reduction, we implemented the proposed scheme on a FPGA chip and compared with conventional one in terms of decoding speed. The decoding speed of the proposed scheme is faster than conventional one at least by 5 times for a single iteration of turbo decoding","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"42 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114126034","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
Effect of tap gain and spatial correlations to wideband capacity and experimental validation 分接增益和空间相关性对宽带容量的影响及实验验证
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359382
P. Kafle, A. Intarapanich, A. Sesay, J. McRory
{"title":"Effect of tap gain and spatial correlations to wideband capacity and experimental validation","authors":"P. Kafle, A. Intarapanich, A. Sesay, J. McRory","doi":"10.1109/ICCS.2004.1359382","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359382","url":null,"abstract":"In this paper, the capacity of wideband multiple input, multiple output (MIMO) system is evaluated by using channel measurement techniques. The tap-gain and spatial correlations of the MIMO system are also analyzed. A MIMO-channel characterization platform has been developed for channel sounding in a frequency selective fading environment. Capacity results from these experiments are discussed in an indoor office environment. The measurement data are analyzed to obtain the correlation statistics as well as their effect to the MIMO capacity. It is shown that the MIMO capacity in the wideband case depends on all the correlation effects. It is thus important to quantify the spatial correlations at transmit and receive sides as well as the tap-gain correlations to accurately estimate the capacity. A unified wideband MIMO channel model that can be used for simulations is validated based in our experiments","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125920660","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
MLSE-based receivers on DWDM lightwave systems 基于mlse的DWDM光波系统接收机
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359441
H. Carrer, M. Hueda, D. Crivelli
{"title":"MLSE-based receivers on DWDM lightwave systems","authors":"H. Carrer, M. Hueda, D. Crivelli","doi":"10.1109/ICCS.2004.1359441","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359441","url":null,"abstract":"In dense wavelength division multiplexed (DWDM) links, the need for greater available bandwidth results in smaller channel separation and larger channel count. This increases the importance of nonlinear coupling effects such as four wave mixing (FWM) and cross-phase modulation (CPM). These impairments, together with chromatic dispersion (CD), polarization mode dispersion (PMD), and amplified spontaneous emission (ASE) noise limit the maximum reach of the optical links. Maximum likelihood sequence estimation (MLSE) receivers can incorporate detailed knowledge of the statistical properties of noise and crosstalk into the decision process, therefore improving performance in the presence of these impairments. These receivers have been previously proposed in [(W. Sauer-Greff et al., 2003), (H.F. Haunstein et al., 2001)] to combat CD and PMD in IM/DD optical channels. In this paper we propose to extend the use of MLSE to DWDM links to combat the combined effect of nonlinear crosstalk, dispersion and noise. We derive a new analytical expression for the statistics of the received signal in the presence of FWM which is necessary to implement the MLSE receiver. As a second important contribution of this paper, we present a theoretical performance analysis of MLSE in DWDM optical channels. Computer simulations show excellent agreement between the prediction of the theory and simulation results","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127041401","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
Performance analysis of SD/SS code acquisition for FO-CDMA systems using PPM signaling and optical orthogonal code 基于PPM信号和光正交码的FO-CDMA系统SD/SS码采集性能分析
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359463
A. Pham, H. Yashima
{"title":"Performance analysis of SD/SS code acquisition for FO-CDMA systems using PPM signaling and optical orthogonal code","authors":"A. Pham, H. Yashima","doi":"10.1109/ICCS.2004.1359463","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359463","url":null,"abstract":"This paper proposes and theoretically analyzes the performance of single-dwell serial-search (SD/SS) code acquisition for fiber-optic code-division multiple-access (CDMA) systems using pulse-position modulation (PPM) signaling and optical orthogonal code (OOC). To analyze the proposed code acquisition system, mean acquisition time is derived taking into account multiple-access interference (MAI) and receivers shot-noise. Discussion upon effect of various system parameters to the performance of proposed system is also presented","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124377437","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
Multi-antenna downlink precoding with individual rate constraints: power minimization and user ordering 具有个别速率约束的多天线下行预编码:功率最小化和用户排序
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359336
C. Fung, Wei Yu, Teng Joon Lim
{"title":"Multi-antenna downlink precoding with individual rate constraints: power minimization and user ordering","authors":"C. Fung, Wei Yu, Teng Joon Lim","doi":"10.1109/ICCS.2004.1359336","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359336","url":null,"abstract":"This paper addresses the problem of achieving a specified information rate for every user in a multi-user MIMO broadcast channel. We propose two methods for finding the set of transmit covariance matrices that minimizes the transmit power subject to the dirty-paper coding rates equal to some specified values. The first method applies to the case with a fixed encoding order and each receiver has one antenna. The second applies to the general case without a fixed encoding order and with time sharing taken into account, and has a complexity polynomial in the number of users","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121651277","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: 29
Information theoretic clustering: an approach to reduce user-tracking overheads in cellular networks 信息理论聚类:一种减少蜂窝网络中用户跟踪开销的方法
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359362
P. Dey, R. Manakkal
{"title":"Information theoretic clustering: an approach to reduce user-tracking overheads in cellular networks","authors":"P. Dey, R. Manakkal","doi":"10.1109/ICCS.2004.1359362","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359362","url":null,"abstract":"Tracking information about users in a cellular network may need to be clustered for reasons of efficient distributed storage, transmission limitations, network constraints etc., especially at the remote locations or edge servers. We present here an information theoretic framework for clustering user-tracking information. One would like to cluster the information in such a way that given the clustered information at a remote location, the number of bits required to reconstruct the complete information is minimum. This minimizes the overhead of transporting these extra description bits for reconstructing the complete information, whenever it is required at the remote location. Finding the optimal clustering to minimize the conditional description of an information has good bounds in the set of good solutions of the problem of partitioning n weights into k subsets such that the largest and the smallest subset sums is minimized. However, the latter problem of partitioning is an NP-complete problem but good heuristic algorithms exist which provide suboptimal solutions. We discuss some of these heuristic strategies to achieve suboptimal clusters, present a lower bound and an estimate of an upper bound to our optimal solution and show that the heuristic solution is quite close to the optimal solution","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122108350","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 extended model for TCP/IP architecture TCP/IP体系结构的扩展模型
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359397
D.M. Bortoluzzi, E.S. Cunha, E. Specialski
{"title":"An extended model for TCP/IP architecture","authors":"D.M. Bortoluzzi, E.S. Cunha, E. Specialski","doi":"10.1109/ICCS.2004.1359397","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359397","url":null,"abstract":"This paper presents a proposal for the session layer introduction into the TCP/IP architecture, generating an extended model able to respond to actual and future application requirements. The main aspects of the proposed model as well as the advantages of its utilization are discussed. Considerations on the necessary efforts in order to perform the adaptations are also made","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116558851","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
Performance analysis of trellis coded beamforming schemes for MIMO channels MIMO信道栅格编码波束形成方案的性能分析
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359381
L. Chu, Jinhong Yuan
{"title":"Performance analysis of trellis coded beamforming schemes for MIMO channels","authors":"L. Chu, Jinhong Yuan","doi":"10.1109/ICCS.2004.1359381","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359381","url":null,"abstract":"This paper presents the trellis coded beamforming schemes for MIMO fading channels. We propose that if the channel state information is available at the transmitter and the coded signals are weighted with the relevant channel information before transmission, the system can actually achieve full transmit diversity and coding gain without the complex design of space-time codes. The error performances of such schemes over fast and slow Rayleigh fading channels are derived. It is shown that on fast Rayleigh fading channel, the code effective length and the product distances should be maximized to achieve higher performance gain, while on slow Rayleigh fading channel, the minimum squared Euclidean distance between the pairwise sequences should be maximized. Furthermore, we show that this trellis coded beamforming scheme outperforms the space-time trellis coded beamforming schemes. Simulation on slow Rayleigh fading channels has been conducted to verify the performance analysis","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129905326","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
Broadband interferrence suppression in DS-SS system with modified chirp Fourier transform 基于改进啁啾傅立叶变换的DS-SS系统宽带干扰抑制
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359456
Yongmei Wei, G. Bi
{"title":"Broadband interferrence suppression in DS-SS system with modified chirp Fourier transform","authors":"Yongmei Wei, G. Bi","doi":"10.1109/ICCS.2004.1359456","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359456","url":null,"abstract":"This paper presents the application of the discrete chirp Fourier transform for interference excision in DS-SS systems. Detailed analysis on the undesirable influence of side-lobes due to windowing operation is provided through both theoretical deviation and experimental results. A new efficient excision method is proposed by using modified DCFT to minimize the distortion from the side-lobes. With a computational complexity in the order of O(Nlog2N), the proposed method is shown to achieve a much better performance in terms of bit error rates in the presence of white noise and linear chirp-like interference within a large range of interference to signal ratios (ISR)","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132652206","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
Impact of embedding techniques in FBG sensors 嵌入技术对光纤光栅传感器的影响
The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI: 10.1109/ICCS.2004.1359438
J. Hao, G. Peng, C. Liaw, Wee Chye Ho, Lihao Chen, S. Takahashi, J. Ng, Xiaoqun Zhou, Chao Lu
{"title":"Impact of embedding techniques in FBG sensors","authors":"J. Hao, G. Peng, C. Liaw, Wee Chye Ho, Lihao Chen, S. Takahashi, J. Ng, Xiaoqun Zhou, Chao Lu","doi":"10.1109/ICCS.2004.1359438","DOIUrl":"https://doi.org/10.1109/ICCS.2004.1359438","url":null,"abstract":"Embedded fiber Bragg gratings (FBGs) have been fabricated for use as pressure sensors to measure forces applied in the direction perpendicular to the fiber axis. The 1 cm length acrylate-coated FBGs were embedded into fiber-reinforced composites in two orientations in separate samples to test the properties of pressure sensor in each case. In samples where the FBG is embedded in parallel to the carbon fiber, the reflected spectrum remains a single wavelength peak as expected from an FBG. However, for samples where the FBG is placed at 90deg to the carbon fiber, peak split was observed. Scanning electron microscopy (SEM) of the embedded acrylate-coated fiber shows that the FBG embedded parallel to the carbon fiber is wrapped completely while the FBG embedded at 90deg to the carbon fiber is difficult to be wrapped well, suggesting the existence of longitudinal inhomogeneity","PeriodicalId":333629,"journal":{"name":"The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133448492","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
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