2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)最新文献

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Traffic models for video game applications 视频游戏应用的流量模型
C. Heyaime, V. Prabhu
{"title":"Traffic models for video game applications","authors":"C. Heyaime, V. Prabhu","doi":"10.1109/ETS.2001.979415","DOIUrl":"https://doi.org/10.1109/ETS.2001.979415","url":null,"abstract":"Efficient resource utilization in access networks requires a characterization of the types of traffic the network will handle. This traffic characterization can be done in two steps. The first step involves the identification of the applications that use network resources and the percentage of time they are active. The second step describes the traffic generation pattern of an active application. In this work we analyze network traces generated by two popular action video game applications in order to characterize their traffic generation pattern. This characterization is achieved by obtaining a statistical description of different parameters inter-packet time, inter-burst time, burst-length, and packet-length associated with a traffic model that employs a state machine. The model is shown to be robust, that is, the parameters of the model can be characterized using the same probability distribution independent of the application. It is shown that the gamma (which encompasses the exponential distribution as a special case) distribution can be used to characterize the random parameters of the model. Observed values of the parameters are presented.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130436516","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
A DSP-based implementation of a WCDMA reverse link design 一种基于dsp实现的WCDMA反向链路设计
M. Yeary, N. Kehtarnavaz, S. Attoor, M. Haji, D. Horton
{"title":"A DSP-based implementation of a WCDMA reverse link design","authors":"M. Yeary, N. Kehtarnavaz, S. Attoor, M. Haji, D. Horton","doi":"10.1109/ETS.2001.979442","DOIUrl":"https://doi.org/10.1109/ETS.2001.979442","url":null,"abstract":"This paper discusses a DSP (digital signal processor) implementation of a WCDMA (wideband code division multiple access) reverse link based on the TMS320C6201 fixed-point processor. The reverse link implementation does not include the analog channel modulation and demodulation blocks, but only the source encoding of the data and the spreading. The results of the real-time implementation are presented, along with the software optimization techniques employed.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127897085","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
Leech lattice coding and modulation for IEEE 802.11a WLAN IEEE 802.11a WLAN的Leech晶格编码和调制
N. Wang, J. Gibson
{"title":"Leech lattice coding and modulation for IEEE 802.11a WLAN","authors":"N. Wang, J. Gibson","doi":"10.1109/ETS.2001.979418","DOIUrl":"https://doi.org/10.1109/ETS.2001.979418","url":null,"abstract":"A 24-dimensional Leech lattice coding and modulation scheme is proposed to improve the physical layer performance of the IEEE 802.11 a wireless LAN standard. We present in this paper the construction of an IEEE 802.11 a compliant Leech lattice encoder and the implementation of a maximum-likelihood soft-decision decoder based on half Leech lattice set partitioning. Within the constraint of the current IEEE 802.11a standard, the proposed Leech lattice code supports flexible data rates of up to 96 Mbit/s. Substantial coding gain and better SNR performance are achieved at high data rate, in both bit error rate (BER) and packet error rate (PER). As a candidate for implementation of block-coded modulation in OFDM systems, the potential of the Leech lattice is evaluated by comparing with uncoded QAM and one trellis coded modulation (TCM) scheme. Simulation results on BER and PER in an AWGN channel are demonstrated at different data rates.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123854820","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
High-power single-frequency semiconductor lasers 大功率单频半导体激光器
S. Selmic, S.L. Wilson, G. Evans, J. Kirk, Z.A. Alhilali, D. Phan
{"title":"High-power single-frequency semiconductor lasers","authors":"S. Selmic, S.L. Wilson, G. Evans, J. Kirk, Z.A. Alhilali, D. Phan","doi":"10.1109/ETS.2001.979420","DOIUrl":"https://doi.org/10.1109/ETS.2001.979420","url":null,"abstract":"We have developed a single-frequency tapered laser emitting at a wavelength of 1.55 pm. The ridge waveguide section enables only one lateral mode, while the DBR structure provides single ffequency operation. This tapered laser has 20 dl3 side-mode suppression at continuous wave (CW) power levels up to 0.6 W. 80 'YO of the power from this device remains in the central lobe of the far-field at a power level of 0.5 W. A Gaussian contact over the tapered section matches the current distribution to the lateral optical profile reducing self-focusing and beam instability effects. We are also developing both distributed feedback (DFB) and distributed Bragg reflector (DBR) angled-stripe semiconductor laser designs for high power. To obtain power levels approaching 10 W, we are using a lenslike waveguide that causes divergence along the lateral direction along with a second order grating to provide outcoupling along the surface of the device.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125148505","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
Application of the unequal two-tone method for AM-AM and AM-PM characterization of MMIC power amplifiers 不等双音法在MMIC功率放大器AM-AM和AM-PM表征中的应用
C. Campbell, S.A. Brown
{"title":"Application of the unequal two-tone method for AM-AM and AM-PM characterization of MMIC power amplifiers","authors":"C. Campbell, S.A. Brown","doi":"10.1109/ETS.2001.979433","DOIUrl":"https://doi.org/10.1109/ETS.2001.979433","url":null,"abstract":"The unequal 2-tone method is reviewed and applied to K-Band MMIC power amplifiers. The technique can be used to simultaneously characterize AM-AM, AM-PM conversion coefficients and insertion phase under drive as well as estimate third order intermodulation ratio and intercept point. The method may be applied by making a simple modification to existing equal 2-tone or mixer test systems. Test results are presented in-fixture for a 1 W power amplifier MMIC at 22 GHz and on-wafer in a production environment for two 20 GHz power amplifier MMIC.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131465999","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
Fabrication of micromachined devices on flexible substrates 柔性基板上微机械器件的制造
A. Yaradanakul, A. Yildiz, D. Butler, Z. Çelik-Butler
{"title":"Fabrication of micromachined devices on flexible substrates","authors":"A. Yaradanakul, A. Yildiz, D. Butler, Z. Çelik-Butler","doi":"10.1109/ETS.2001.979427","DOIUrl":"https://doi.org/10.1109/ETS.2001.979427","url":null,"abstract":"This paper overviews the current state-of-the-art in electronics and MEMS devices on flexible substrates. the technical challenges ahead in the fabrication of electronic circuits and our work in progress on the development of infrared detectors on flexible substrates. A novel fabrication method has been developed for microbolometers on flexible polyimide substrates. Two methods are being employed. The first is to bond a Kapton sheet to a Si carrier wafer with an adhesive and the second is to spin a polyimide (Kapton-like) substrate film onto a Si wafer coated with a release layer. This research is the first known effort to build microsensors on a flexible substrate. Low temperature fabrication techniques are employed to minimize the thermal cycling of the polyimide substrate. In our preliminary work, microbolometers on flexible substrates displayed a temperature coefficient of resistance (TCR=(1/R)(dR/dT)) of -3.07%, at room temperature. The microbolometers achieved responsivity and detectivity as high as 6/spl times/10/sup 3/ V/W and 3/spl times/10/sup 7/ cm.Hz/sup 1/2//W, respectively, at 1.85 /spl mu/A of current bias. This detectivity is approximately 40% of the temperature fluctuation limit for these detectors. These results are comparable to the ones obtained with micromachined devices on silicon substrates.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124691761","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
Down link diversity for GSM-EDGE GSM-EDGE的下行链路分集
K. Kuchi, R. Pirhonen, P. Ranta
{"title":"Down link diversity for GSM-EDGE","authors":"K. Kuchi, R. Pirhonen, P. Ranta","doi":"10.1109/ETS.2001.979430","DOIUrl":"https://doi.org/10.1109/ETS.2001.979430","url":null,"abstract":"As building of the third generation cellular networks has begun the operators are deploying new hardware and doing a major revision of their network plans. This gives an excellent opportunity to introduce new system enhancements and many have been proposed in various standardization bodies working on the 3G systems. Some of the enhancements would require new technical solutions at the terminal side, while some can be introduced without any standardization work. This paper discusses such downlink enhancement schemes for GSM/EDGE systems that do not require any changes at the mobile end and thus benefit both the users of the new 3G services as well as the large customer base continuing to use the services available today.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123745582","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
Overview of SHDSL system performance SHDSL系统性能概述
D. Daecke
{"title":"Overview of SHDSL system performance","authors":"D. Daecke","doi":"10.1109/ETS.2001.979409","DOIUrl":"https://doi.org/10.1109/ETS.2001.979409","url":null,"abstract":"SHDSL is the first standardized multi-bit-rate symmetric DSL for data rates between 192 kbit/s and 2312 kbit/s. A 16-level trellis-coded PAM line code is used. The main challenges of SHDSL system design are optimization with respect to reach, spectral compatibility, power consumption and implementation cost. The loop reach of PAM-based DSL systems can be estimated by a method independent of specific implementation details. In this paper, techniques to increase loop reach using shaped and asymmetric PSD are discussed. With asymmetric PSD, some increase in loop reach can be obtained if ideal assumptions are made on the system. but in application this theoretical increase is limited by practical implementation issues, and is counter-balanced by higher power consumption.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126228659","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
Adaptive handoff method using mobile location information 使用移动位置信息的自适应切换方法
S.S. Wang, M. Green, M. Malkawi
{"title":"Adaptive handoff method using mobile location information","authors":"S.S. Wang, M. Green, M. Malkawi","doi":"10.1109/ETS.2001.979431","DOIUrl":"https://doi.org/10.1109/ETS.2001.979431","url":null,"abstract":"The performance or handoff algorithm is critical to the overall system performance of cellular mobile communications. This paper presents a handoff algorithm that uses adaptive handoff values based on mobile location information and cell RF propagation statistics. Analysis is focused on the probability of hard/soft handoff and the probability of dropped calls/outage in the TDMA and CDMA systems. The simulation results shorn, that the probability of unnecessary handoff is reduced using the adaptive handoff algorithm with a minor increase in the dropped-call probability. This improvement is significant if the propagation signal varies rapidly in the cell.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127398638","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
Enhanced Bluetooth and IEEE 802.11 (FH) via multi-carrier implementation of the physical layer 增强蓝牙和IEEE 802.11 (FH)通过多载波物理层实现
B. Natarajan, C. Nassar, S. Shattil
{"title":"Enhanced Bluetooth and IEEE 802.11 (FH) via multi-carrier implementation of the physical layer","authors":"B. Natarajan, C. Nassar, S. Shattil","doi":"10.1109/ETS.2001.979440","DOIUrl":"https://doi.org/10.1109/ETS.2001.979440","url":null,"abstract":"In this paper, we propose a novel FSK scheme that enhances the performance and throughput of Bluetooth and wireless LAN systems (based on the IEEE 802.11 (FH) standard). Specifically, we propose a novel FSK implementation where, rather than frequency f/sub 0/ representing bit '0' and f/sub 1/ representing bit '1', we transmit multiple, orthogonal, in-phase sub-carriers around f/sub 0/ or f/sub 1/ to represent the binary information. We demonstrate that this technique is spectrally efficient when compared to traditional GFSK. Moreover, performance benefits are also demonstrated in standard indoor wireless channels employing both non-coherent and novel coherent reception techniques. Finally, we show how, with coherent reception, pseudo-orthogonal transmission of information can be employed to enhance the data rates with no cost in bandwidth.","PeriodicalId":413036,"journal":{"name":"2001 IEEE Emerging Technologies Symposium on BroadBand Communications for the Internet Era. Symposium Digest (Cat. No.01EX508)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125808369","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
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