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2005 2nd International Symposium on Wireless Communication Systems最新文献

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Iterative Frame Synchronization for Frequency-Selective Channels 频率选择信道的迭代帧同步
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547760
A. Abdel-Samad
{"title":"Iterative Frame Synchronization for Frequency-Selective Channels","authors":"A. Abdel-Samad","doi":"10.1109/ISWCS.2005.1547760","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547760","url":null,"abstract":"Iterative receiver techniques provide a powerful tool to enhance receiver performance and are gradually becoming the norm in modern communication systems. Although they have been used in various receiver components like channel estimation, equalization and decoding, they have not been explicitly applied to frame synchronization. In this paper, we propose an efficient iterative frame synchronization technique in which the hard-output, un-coded data at the output of the equalizer is utilized to improve the accuracy of synchronization. Simulation results show huge signal-to-noise-ratio (SNR) gains in terms of false acquisition probability (FAP), mean square channel estimation error (MSCEE) and un-coded bit error rate (BER) at all SNR values. The proposed approach can be easily applied to continuous or burst type frame synchronization under additive white Gaussian noise (AWGN) in addition to flat or frequency-selective channels","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121318411","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
Scalable and adaptive multicast video streaming for heterogeneous and mobile users 针对异构和移动用户的可扩展和自适应多播视频流
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547681
Li Lao, Jun-hong Cui, M. Sanadidi, M. Gerla
{"title":"Scalable and adaptive multicast video streaming for heterogeneous and mobile users","authors":"Li Lao, Jun-hong Cui, M. Sanadidi, M. Gerla","doi":"10.1109/ISWCS.2005.1547681","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547681","url":null,"abstract":"To provide scalable multicast video streaming services for heterogeneous and mobile users, we design a protocol called SAMP. It is based on a multicast service overlay model. By employing layered encoding, aggregated multicast, and user clustering, SAMP can handle heterogeneity, scalability and mobility very effectively. We conduct simulations and the results show the promising performance of SAMP.","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116161461","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: 9
QoS Monitoring for Professional Short-Message-Services in Mobile Networks 移动网络中专业短消息业务的QoS监控
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547692
Andreas Waadt, G. Bruck, P. Jung, M. Kowalzik, T. Trapp, C. Begall
{"title":"QoS Monitoring for Professional Short-Message-Services in Mobile Networks","authors":"Andreas Waadt, G. Bruck, P. Jung, M. Kowalzik, T. Trapp, C. Begall","doi":"10.1109/ISWCS.2005.1547692","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547692","url":null,"abstract":"In mobile environments, packet transmission services suffer from packet losses due to e.g. inadequate received signal quality, or forced by protocols in the signaling domain of the infrastructure of a mobile communications network. To reduce the occurrence of packet losses and, hence, to improve the quality of packet transmission services, such as e.g. the short message service (SMS) deployed in GSM (Global System for Mobile Communications) based mobile communications networks, a quantitative analysis of the quality of service (QoS) in the signaling domain is mandatory. For this reason, appropriate QoS parameters are needed. In this communication, the authors propose such QoS parameters and apply them to the SMS in GSM networks. Furthermore, a system framework for QoS monitoring, alerting and reconfiguring an SMS Center is presented. It operates near real-time and, therefore, helps to maintain a high QoS level. Selected monitoring results gathered during real world network operation are presented","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116297430","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: 7
Soft Handovers over 802.1lb with Multiple Interfaces 支持802.1lb多接口软切换
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547763
Emil Ivov, Thomas Noël
{"title":"Soft Handovers over 802.1lb with Multiple Interfaces","authors":"Emil Ivov, Thomas Noël","doi":"10.1109/ISWCS.2005.1547763","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547763","url":null,"abstract":"This paper describes an optimization of the handover process over WLAN networks, which allows nodes to simultaneously attach to more than one access point and thus avoid packet loss. The document also contains a description of protocol semantics specific to that optimization, a theoretical evaluation and performance results acquired by simulation","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"46 38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122929831","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
On the Inter-Symbol-Interference in several Ultra Wideband systems 几种超宽带系统的符号间干扰研究
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547699
L. Piazzo, F. Ameli
{"title":"On the Inter-Symbol-Interference in several Ultra Wideband systems","authors":"L. Piazzo, F. Ameli","doi":"10.1109/ISWCS.2005.1547699","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547699","url":null,"abstract":"The performance of several ultra-wideband (UWB) transmission schemes is analysed when the channel is frequency selective so that inter-symbol-interference (ISI) arises at the receiver. The UWB schemes considered employ time hopping (TH) and/or direct sequence (DS) as spreading method and a correlation receiver. Analytical expressions for the signal to interference power ratio (SIR) are derived are used to compare the schemes over several channels. Also the bit error rate (BER) is discussed. The theoretical results are compared with simulation results","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"600 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123164060","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
Integration of small and large packet-level FEC codes with data carousels for reliable multicast transport over satellite links 集成小型和大型包级FEC代码与数据轮播在卫星链路上可靠的多播传输
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547822
M. Chipeta, L. Fan, B. Evans, M. Karaliopoulos
{"title":"Integration of small and large packet-level FEC codes with data carousels for reliable multicast transport over satellite links","authors":"M. Chipeta, L. Fan, B. Evans, M. Karaliopoulos","doi":"10.1109/ISWCS.2005.1547822","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547822","url":null,"abstract":"Automatic repeat request (ARQ), data carousels and packet-level forward error correction (PLFEC) are fundamental techniques for combating packet loss in point-to-multipoint communications. Generally speaking, ARQ-based techniques are unattractive due to the feedback implosion they generate. Furthermore, in broadcast/multicast wireless networks, radio resources are scarce and feedback may not be an option at all. Two error mitigation mechanisms that become relevant in this scenario are data carousels and PLFEC. In this work, we consider the application of these two techniques as components of an integrated layer in satellite environments. We also investigate the impact of the type of PLFEC code, small or large, on the main user-oriented performance metric of the data carousels, the average content download time","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121121896","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
Single Antenna Interference Cancellation for GSM by Enhanced Maximum SNR Filter 增强最大信噪比滤波器消除GSM单天线干扰
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547715
Luigi Mattellini
{"title":"Single Antenna Interference Cancellation for GSM by Enhanced Maximum SNR Filter","authors":"Luigi Mattellini","doi":"10.1109/ISWCS.2005.1547715","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547715","url":null,"abstract":"We presents a link level performance evaluation and comparison of single antenna interference cancellation (SAlC) and conventional receivers in a synchronous GSM network scenario. The SAIC receiver is equipped with a maximum signal to noise ratio (maxSNR) FIR filter. This interference rejection method has been proven to be very effective in suppressing single co-channel and adjacent-channel interferers, however, in single co-channel scenario, raw BER performance are affected by a severe floor close to 10-3. In this paper it is shown how the floor can be removed allowing the SAIC receiver to show a constant gain when compared to a conventional receiver","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128785331","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: 9
Ultrawideband (UWB) RF Signal Source 超宽带(UWB)射频信号源
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547698
U. Rohde, A. Poddar
{"title":"Ultrawideband (UWB) RF Signal Source","authors":"U. Rohde, A. Poddar","doi":"10.1109/ISWCS.2005.1547698","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547698","url":null,"abstract":"Ultrawideband (UWB) has drawn the interest among the research and wireless communication communities due to its configurability and adaptability, which enables it to coexist with many concurrent services. There are currently various mobile communication standards in use worldwide. The mobile communication industry is under transition phase and experiencing a shift from single system connectivity to multi-system connectivity. The objective is to communicate over varying distances using varying bit rates with a high-speed data and coverage. One of the challenging blocks to design in such transreceiver is the multi-standard low noise ultrawideband (UWB) RF signal source (VCOs) that can provide seamless connectivity among the various standards considered. The VCOs design approach demonstrated in this work can satisfy the present demand of tuning range and noise performance, and reconfigurable for integration in chip form. The measured phase noise is better than -112 dBc/Hz at 100 kHz offset over the tuning range (0.5-2 GHz/2-8 GHz), and to our knowledge this is the best phase noise and highest tuning band of operation using N-push topology with discrete components so far reported","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126097981","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
Comparison of Coherent and Non-Coherent Space Time Schemes for Frequency Selective Fast-Varying Channels 频率选择快变信道中相干与非相干时空格式的比较
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547649
B. L. Saux, M. Hélard, P. Bouvet
{"title":"Comparison of Coherent and Non-Coherent Space Time Schemes for Frequency Selective Fast-Varying Channels","authors":"B. L. Saux, M. Hélard, P. Bouvet","doi":"10.1109/ISWCS.2005.1547649","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547649","url":null,"abstract":"This paper presents a comparison between coherent and non-coherent multi-antenna systems for frequency and time selective channel. Performance of a coherent system mainly depends on channel estimation at the receiver. This estimation generally involves insertion of pilot symbols in a frame and thus a loss of spectral efficiency. Differential space time modulation (DSTM), which is an extension of SISO differential techniques to MIMO case, seems to be an alternative solution to attain high spectral efficiency and good performance in fast time-varying channels, where estimation of channels may be difficult. When comparisons between DSTM and coherent system are provided, perfect channel knowledge at the receiver is generally assumed, In this paper, we propose to include realistic channel estimation for coherent system as well as degradation of spectral efficiency used due to necessary pilot insertion. Simulation results show that in very fast time-varying channel non-coherent systems outperform systems with channel estimation. Besides, performance of several non-coherent receivers are provided for different channels and with channel coding","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"370 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124640041","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: 19
Optical Intersatellite System Based on DPSK Modulation 基于DPSK调制的星间光学系统
2005 2nd International Symposium on Wireless Communication Systems Pub Date : 2005-12-05 DOI: 10.1109/ISWCS.2005.1547823
S. Betti, V. Carrozzo, E. Duca
{"title":"Optical Intersatellite System Based on DPSK Modulation","authors":"S. Betti, V. Carrozzo, E. Duca","doi":"10.1109/ISWCS.2005.1547823","DOIUrl":"https://doi.org/10.1109/ISWCS.2005.1547823","url":null,"abstract":"The use of optical carrier for intersatellite link (ISLs) can lead the whole system at higher data rates performing low probability of jamming, lower interference, lower power requirements and smaller antenna size. The choice of 1550 nm wavelength technology gives rise to some problems, such as higher antenna size, but offers important benefits: less Doppler shift, less complexity in tracking and acquisition procedure. The main constraint affecting the system performance concerns on the Doppler effect suffered by the signal due to the relative movement between satellites. An analysis of the optical transmitter/receiver performance, operating at 1550 nm will be developed. The communication system is based on a DPSK modulator with direct detection receiver, in order to improve system sensitivity with respect to conventional intensity modulation-direct detection (IM-DD) systems","PeriodicalId":360395,"journal":{"name":"2005 2nd International Symposium on Wireless Communication Systems","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125179562","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: 14
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