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Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)最新文献

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CLR performance improvement of CBR traffic in wireless ATM access networks 无线ATM接入网中CBR业务的CLR性能改进
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798600
L. Cheol, Lee Byung Seub
{"title":"CLR performance improvement of CBR traffic in wireless ATM access networks","authors":"L. Cheol, Lee Byung Seub","doi":"10.1109/VETECF.1999.798600","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798600","url":null,"abstract":"In this paper the cell loss ratio (CLR) performance of constant bit rate (CBR) traffic on wireless asynchronous transfer mode (ATM) access network which consists of an access node and a wireless channel is evaluated. It is focused on the impact of the bit error characteristics of a wireless link on wireless ATM access networks. A possible error control architecture is suggested to improve the CLR performance degradation caused by channel bit errors. The recommended error control scheme for CBR traffic is the concatenated forward error correction (FEC) scheme to make the physical layer as SONET-like as possible. It is confirmed that CLR performance of the network with the recommended scheme is superior to those of access networks with conventional schemes.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"82 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131873982","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
Outage probability for GPRS over GSM voice services GPRS在GSM语音服务上的中断概率
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798447
Shaoji Ni, Yong Liang, S. Haggman
{"title":"Outage probability for GPRS over GSM voice services","authors":"Shaoji Ni, Yong Liang, S. Haggman","doi":"10.1109/VETECF.1999.798447","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798447","url":null,"abstract":"The General Packet Radio Service (GPRS) is designed for transmitting packet data and supposed to take its radio resource from the pool of channels unused by GSM voice services. Obviously, the introduction of GPRS affects on the voice services. In this paper, the outage probability of non-frequency hopping and frequency hopping systems with different frequency reuse factor has been calculated in order to investigate those effects. The number of unused voice channels allocated to GPRS depends on the difference between the outage level of the existing GSM network and the maximum acceptable level. For both non-frequency hopping and frequency hopping systems, GPRS affects the QoS of voice services of the network with small reuse factor are higher than that of the network with large reuse factor. GPRS will reduce the cell service area, but the reduction percentage of the cell service area for the system with a small reuse factor is higher than that for the system with a large reuse factor.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115728334","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
Balance-fed L-type loop antenna system for handset 用于手机的平衡馈电l型环形天线系统
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801482
H. Morishita, H. Furuuchi, K. Fujimoto
{"title":"Balance-fed L-type loop antenna system for handset","authors":"H. Morishita, H. Furuuchi, K. Fujimoto","doi":"10.1109/VETECF.1999.801482","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801482","url":null,"abstract":"This paper presents (1) a discussion of the design concept of an antenna for a handset and (2) an analysis of a newly proposed L-type loop antenna system, which has a balanced structure and is fed with a balanced line and has a feature producing two polarization components. The balanced structure is constituted to reduce the effect of the currents in the handset unit. In order to confirm the effectiveness of using the balance-fed loop antenna, the current distribution for both the balanced and unbalanced antenna systems are analyzed theoretically and experimentally. Remarkable reduction in the current distribution on the ground plane in the handset for the case of the balance-fed antennas system is shown. There are two advantages in using the L-type element. One is observed in the handset in its talk position and the other is the mitigation of multipath fading. The performance of L-type loop antenna and its significance are discussed.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116073407","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
WCDMA uplink modulation scheme evolution and transmitter implementation WCDMA上行调制方案演进与发射机实现
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798460
H. Lilja, H. Mattila
{"title":"WCDMA uplink modulation scheme evolution and transmitter implementation","authors":"H. Lilja, H. Mattila","doi":"10.1109/VETECF.1999.798460","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798460","url":null,"abstract":"The evolution of a WCDMA uplink modulation scheme is presented. Modulation schemes are analyzed from the power amplifier implementation point of view by comparing the RF envelopes of various modulation schemes. The power amplifier linearity requirements of different modulation schemes are compared using a measured class AB power amplifier. One of the challenges in WCDMA is the implementation of the transmitter for a WCDMA terminal supporting both speech and high-speed data. This paper proposes a transmitter architecture for optimizing the current consumption of the WCDMA terminal in both modes.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116218288","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
Initial frequency acquisition in W-CDMA W-CDMA中的初始频率采集
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798588
Y. Wang, T. Ottosson
{"title":"Initial frequency acquisition in W-CDMA","authors":"Y. Wang, T. Ottosson","doi":"10.1109/VETECF.1999.798588","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798588","url":null,"abstract":"In this paper, methods of estimating the initial frequency error are proposed and evaluated for a mobile station (MS) operated in a wideband code division multiple access (W-CDMA) system. It is assumed that the initial frequency error of a MS can be as large as /spl plusmn/20 kHz due to the inaccuracy of the crystal oscillator. The proposed methods are based on the fast Fourier transform (FFT) technique with quadratic interpolation in the frequency domain to improve the accuracy of frequency estimation. It is found that the proposed FFT based algorithms achieve much better performance when compared to a differential phase detection approach.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114995085","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
Statistics of the minimum coupling loss in UMTS/IMT-2000 reference scenarios UMTS/IMT-2000参考场景中最小耦合损耗统计
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798473
P. Seidenberg, M. Althoff, E. Schulz, G. Herbster, M. Kottkamp
{"title":"Statistics of the minimum coupling loss in UMTS/IMT-2000 reference scenarios","authors":"P. Seidenberg, M. Althoff, E. Schulz, G. Herbster, M. Kottkamp","doi":"10.1109/VETECF.1999.798473","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798473","url":null,"abstract":"The minimum coupling loss (MCL) is an important parameter when designing the characteristics of a new mobile communications system. A method for evaluation of the MCL in the UMTS/IMT-2000 reference scenarios specified by the ETSI is presented. Furthermore some results are given for respective maximum subscriber densities in terms of maximum spectral efficiency for the speech service.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121759996","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
Interference suppression in CDMA downlink through adaptive channel equalization 基于自适应信道均衡的CDMA下行干扰抑制
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798476
M. Heikkila, P. Komulainen, J. Lilleberg
{"title":"Interference suppression in CDMA downlink through adaptive channel equalization","authors":"M. Heikkila, P. Komulainen, J. Lilleberg","doi":"10.1109/VETECF.1999.798476","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798476","url":null,"abstract":"In the synchronous CDMA downlink using orthogonal spreading codes, the multiple access interference (MAI) is essentially caused by the multipath channel. This is why the MAI can be suppressed by channel equalization. In this paper we present a receiver algorithm which performs adaptive channel equalization by estimating the transmitted chip sequence. The adaptation uses Griffiths' algorithm and converges to the LMMSE solution. The receiver is applicable in systems using long code scrambling such as in the 3/sup rd/ generation wideband CDMA proposals, and it is shown to offer significant performance gains when compared to conventional RAKE receivers.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121992110","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: 59
Mobile videotelephony for deaf people: the effect of video quality on the use of text telephony 聋人移动可视电话:视频质量对文字电话使用的影响
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798602
H. Kamphuis, H. Frowein, E. Rikken, J. Spoor
{"title":"Mobile videotelephony for deaf people: the effect of video quality on the use of text telephony","authors":"H. Kamphuis, H. Frowein, E. Rikken, J. Spoor","doi":"10.1109/VETECF.1999.798602","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798602","url":null,"abstract":"This paper reports on a usability study from the perspective of deaf persons of a prototype videotelephony service implemented on a mobile network. The service offered combined video- and text communication. The objective of the experiment was to determine the minimal bandwidth requirements for deaf sign language users and to measure the effect of variable video picture quality on the use of the text telephone. The results of this study indicate that deaf persons who use sign language as their main communication mode are highly adaptable and prefer to use signs even if the video image quality is poor. At the same time, deaf persons expressed a preference for having a text messaging facility available in combination with videotelephony. It was found that the use of the text messages increased with deteriorating video picture quality. A bandwidth of 128 kbps was considered highly useable. Even at 64 kbps some users could communicate through sign language.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123882937","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
Field performance of AMPS/TDMA manual frequency re-allocation AMPS/TDMA手动频率重分配的现场性能
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801720
J. Lin, Y. Şahin, J.J. Shi
{"title":"Field performance of AMPS/TDMA manual frequency re-allocation","authors":"J. Lin, Y. Şahin, J.J. Shi","doi":"10.1109/VETECF.1999.801720","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801720","url":null,"abstract":"Radio resource management becomes more and more challenging as the demand for network capacity increases. This paper describes a local frequency optimization method called manual frequency re-allocation (FRA) to minimize interference level by allocating less disturbed frequencies to individual cells. This paper reports performance results of FRA field trials conducted in three live AMPS/TDMA cellular networks using different optimization approaches.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125099194","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
Performance evaluation of a bandwidth management scheme for a DECT wireless local area network DECT无线局域网带宽管理方案的性能评价
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798632
N. Georgantas, S.K. Papadoukakis, A. Liveris, E. Sykas
{"title":"Performance evaluation of a bandwidth management scheme for a DECT wireless local area network","authors":"N. Georgantas, S.K. Papadoukakis, A. Liveris, E. Sykas","doi":"10.1109/VETECF.1999.798632","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798632","url":null,"abstract":"Increasing commercial interest for wireless LAN has boosted relative research effort during the last few years. The IEEE and ETSI have proposed wireless LAN standards which utilize technological advances to provide high bandwidth. However, the investigation of the capabilities of applied wireless technologies to provide LAN services are of both technical and economical interest. This paper proposes a generic architecture and set of functions for DECT access to an Ethernet LAN and elaborates a dynamic bandwidth management scheme for the DECT air interface to ensure optimum resource utilisation. The access scheme performance is evaluated with an analytic traffic model which is utilized to calculate parameters such as the average delay and the average number of packets in system queues and with extensive system simulation.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125114690","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
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