Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851439
T. Nagaosa, T. Hasegawa
This paper proposes a hierarchical vehicle position encoding scheme for inter-vehicle communication networks (IVCN) and describes the way to derive the best performance using the proposed scheme under a specific condition. It is also shown that the proposed scheme can suppress the position error on transmission caused by channel noise which is lower than that of the uniform energy assignment scheme, and where the signal energy is equal to that of the proposed scheme.
{"title":"A hierarchical vehicle position encoding scheme in inter-vehicle communication networks","authors":"T. Nagaosa, T. Hasegawa","doi":"10.1109/VETECS.2000.851439","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851439","url":null,"abstract":"This paper proposes a hierarchical vehicle position encoding scheme for inter-vehicle communication networks (IVCN) and describes the way to derive the best performance using the proposed scheme under a specific condition. It is also shown that the proposed scheme can suppress the position error on transmission caused by channel noise which is lower than that of the uniform energy assignment scheme, and where the signal energy is equal to that of the proposed scheme.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132942239","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851611
S. Park, H.S. Oh, W. Lee, C. Kang
We analyze the performance of uplink dual-rate DS/CDMA system using the pilot/data-combined channel estimation scheme. Our analysis allows for investigating the characteristics of optimal power allocation subject to varying QoS requirements and furthermore, quantifying the corresponding advantage in terms of the system capacity under the pilot/data-combined channel estimation scheme. We demonstrate that, when the different classes of users with varying channel configurations and quality-of-service (QoS) requirements are co-existing, the system capacity can be significantly improved with the pilot/data-combined scheme as compared with that of system using the conventional pilot-based scheme.
{"title":"Performance of pilot/data-combined channel estimation and power allocations for dual-rate DS/CDMA system over mobile radio channels","authors":"S. Park, H.S. Oh, W. Lee, C. Kang","doi":"10.1109/VETECS.2000.851611","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851611","url":null,"abstract":"We analyze the performance of uplink dual-rate DS/CDMA system using the pilot/data-combined channel estimation scheme. Our analysis allows for investigating the characteristics of optimal power allocation subject to varying QoS requirements and furthermore, quantifying the corresponding advantage in terms of the system capacity under the pilot/data-combined channel estimation scheme. We demonstrate that, when the different classes of users with varying channel configurations and quality-of-service (QoS) requirements are co-existing, the system capacity can be significantly improved with the pilot/data-combined scheme as compared with that of system using the conventional pilot-based scheme.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133348511","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851716
Wenzhen Li, C. Law, J. Ong, V. Dubey
The statistical characteristics of rain attenuation in equatorial zone is investigated first. Then in comparison with Loo's (see Proceedings of the IEEE, vol.86, no.7, p.1442-63, 1998) Ka-band weather land mobile satellite (LMS) channel model, a more reasonable LMS channel model incorporated with weather impairments is proposed based on Lutz's (1991) LMS channel model. The PDF of the received signal and BER performance with Loo's and our Ka-band weather LMS channel model is quantified and compared, the effect of weather impairments and rain attenuation on BER performance is also evaluated.
{"title":"Ka-band land mobile satellite channel model: with rain attenuation and other weather impairments in equatorial zone","authors":"Wenzhen Li, C. Law, J. Ong, V. Dubey","doi":"10.1109/VETECS.2000.851716","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851716","url":null,"abstract":"The statistical characteristics of rain attenuation in equatorial zone is investigated first. Then in comparison with Loo's (see Proceedings of the IEEE, vol.86, no.7, p.1442-63, 1998) Ka-band weather land mobile satellite (LMS) channel model, a more reasonable LMS channel model incorporated with weather impairments is proposed based on Lutz's (1991) LMS channel model. The PDF of the received signal and BER performance with Loo's and our Ka-band weather LMS channel model is quantified and compared, the effect of weather impairments and rain attenuation on BER performance is also evaluated.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133507926","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851574
Vladan M. Jovanovic, D. Cuberovic
The IS-95B soft handoff is analyzed, which is likely to be incorporated in all CDMA-based 3G standards. A simple semi-empirical model for evaluation of various handoff strategies is developed. Based on the model, we show that a part of the capacity improvement predicted for 3G systems that is expected to come from a new soft handoff algorithm might not be achievable. This corroborates the conclusion published in Chedda (1999). However, we found that the new algorithm can still significantly improve the utilization of the network resources, and reduce operator costs. Experimental results for several comparative IS-95A vs. IS-95B field tests are presented, which compare favorably with our simulations. As opposed to Chedda, no significant increase in the messaging was observed, nor any problems with either the forward or the reverse link.
{"title":"Theoretical and experimental analysis of the new soft handoff algorithm for CDMA systems","authors":"Vladan M. Jovanovic, D. Cuberovic","doi":"10.1109/VETECS.2000.851574","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851574","url":null,"abstract":"The IS-95B soft handoff is analyzed, which is likely to be incorporated in all CDMA-based 3G standards. A simple semi-empirical model for evaluation of various handoff strategies is developed. Based on the model, we show that a part of the capacity improvement predicted for 3G systems that is expected to come from a new soft handoff algorithm might not be achievable. This corroborates the conclusion published in Chedda (1999). However, we found that the new algorithm can still significantly improve the utilization of the network resources, and reduce operator costs. Experimental results for several comparative IS-95A vs. IS-95B field tests are presented, which compare favorably with our simulations. As opposed to Chedda, no significant increase in the messaging was observed, nor any problems with either the forward or the reverse link.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134572202","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851310
M. Haardt, A. Klein, S. Oestreich, M. Purat, V. Sommer, T. Ulrich
The third generation mobile radio system UTRA that has been specified in the Third Generation Partnership Project (3GPP) consists of an FDD and a TDD mode. This paper presents the physical layer of the UTRA TDD mode, which is based on TD-CDMA. Important system features are explained in detail. The physical layer is responsible for the transmission of transport blocks over the air interface. This includes forward error correction, multiplexing of different transport channels on the same physical resources, rate matching, modulation, spreading and RF processing.
{"title":"The physical layer of UTRA TDD","authors":"M. Haardt, A. Klein, S. Oestreich, M. Purat, V. Sommer, T. Ulrich","doi":"10.1109/VETECS.2000.851310","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851310","url":null,"abstract":"The third generation mobile radio system UTRA that has been specified in the Third Generation Partnership Project (3GPP) consists of an FDD and a TDD mode. This paper presents the physical layer of the UTRA TDD mode, which is based on TD-CDMA. Important system features are explained in detail. The physical layer is responsible for the transmission of transport blocks over the air interface. This includes forward error correction, multiplexing of different transport channels on the same physical resources, rate matching, modulation, spreading and RF processing.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133067935","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851593
A. Jalali, R. Padovani, R. Pankaj
Forward link data throughput performance of a high data rate wireless access system is presented. On the forward link of the proposed system data is transmitted to different access terminals (AT) in a TDM fashion. The rate transmitted to each AT is variable and depends on each AT's measured SINR. ATs send to the access points (AP) the index of the highest data rate which can be received reliably. A scheduler at the AP determines the next terminal to be served based on the reported data rate requests from the terminals and the amount of data that has already been transmitted to each terminal. A cell layout of 19 3-sector and 6-sector hexagonal cells is considered. The throughput of the forward link of the embedded sector is simulated for stationary terminals.
{"title":"Data throughput of CDMA-HDR a high efficiency-high data rate personal communication wireless system","authors":"A. Jalali, R. Padovani, R. Pankaj","doi":"10.1109/VETECS.2000.851593","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851593","url":null,"abstract":"Forward link data throughput performance of a high data rate wireless access system is presented. On the forward link of the proposed system data is transmitted to different access terminals (AT) in a TDM fashion. The rate transmitted to each AT is variable and depends on each AT's measured SINR. ATs send to the access points (AP) the index of the highest data rate which can be received reliably. A scheduler at the AP determines the next terminal to be served based on the reported data rate requests from the terminals and the amount of data that has already been transmitted to each terminal. A cell layout of 19 3-sector and 6-sector hexagonal cells is considered. The throughput of the forward link of the embedded sector is simulated for stationary terminals.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133142392","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851317
T. Hindelang, M. Kaindl, Joachim Hagenauerl, Max Schmautz, Wen Xu
A variable channel coding scheme for adaptive multirate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM, the basic concept of variable channel coding can be adopted to other digital radio systems like UMTS. The AMR concept allows almost wire-line speech quality even for poor channel conditions by dynamically splitting the gross bit rate between source (speech) and channel coding according to the channel quality.
{"title":"Improved channel coding and estimation for adaptive multirate (AMR) speech transmission","authors":"T. Hindelang, M. Kaindl, Joachim Hagenauerl, Max Schmautz, Wen Xu","doi":"10.1109/VETECS.2000.851317","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851317","url":null,"abstract":"A variable channel coding scheme for adaptive multirate (AMR) speech transmission over mobile radio channels is proposed. Although it was developed for the GSM, the basic concept of variable channel coding can be adopted to other digital radio systems like UMTS. The AMR concept allows almost wire-line speech quality even for poor channel conditions by dynamically splitting the gross bit rate between source (speech) and channel coding according to the channel quality.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"458 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134063904","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851563
S. Aldosari, S. Alshebeili, A. Al-Sanie
Combined linear-Viterbi equalization (CLVE) is a technique that employs a linear pre-filter in conjunction with the Viterbi algorithm (VA) to mitigate the effects of intersymbol interference. The aim of the linear pre-filter is to shape the original channel impulse response to some shorter desired impulse response (DIR) in order to reduce the complexity of the VA. In this paper, we present a new MSE based approach for optimizing CLVEs. This approach takes advantage of the modifications to the VA which are suitable for channels having coarsely located coefficients. Specifically, the new approach has the flexibility in choosing the positions and optimizing the values of nonzero coefficients of DIR. As a result, it includes the conventional MSE-based approaches as a special case. Simulation results have been presented to illustrate the performance of proposed method.
{"title":"A new MSE approach for combined linear-Viterbi equalizers","authors":"S. Aldosari, S. Alshebeili, A. Al-Sanie","doi":"10.1109/VETECS.2000.851563","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851563","url":null,"abstract":"Combined linear-Viterbi equalization (CLVE) is a technique that employs a linear pre-filter in conjunction with the Viterbi algorithm (VA) to mitigate the effects of intersymbol interference. The aim of the linear pre-filter is to shape the original channel impulse response to some shorter desired impulse response (DIR) in order to reduce the complexity of the VA. In this paper, we present a new MSE based approach for optimizing CLVEs. This approach takes advantage of the modifications to the VA which are suitable for channels having coarsely located coefficients. Specifically, the new approach has the flexibility in choosing the positions and optimizing the values of nonzero coefficients of DIR. As a result, it includes the conventional MSE-based approaches as a special case. Simulation results have been presented to illustrate the performance of proposed method.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124894320","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851707
R. Anand, C. Podilchuk, H. Lou
Advances in mobile computing, combined with the increasing demand for multimedia services on mobile terminals have generated much interest in error-resilient video transmission over wireless networks. Much of the work on video transmission has focused on either dealing with packet losses due to congestion found in IP wireline networks or bit errors and packet losses due to the fading channel environment of a wireless network. Many of the applications for multimedia services will involve video transmission over a wired-to-wireless link and an important research topic is error-resilient video which can adapt to the different conditions found in a wired and wireless environment. The current solutions in transmission of multimedia across different networks include some type of transcoder where the source is partially or fully decoded and re-encoded to suit the network conditions. Here we introduce a flexible progressive source/channel coding framework for video which can adapt to the different conditions imposed by wired and wireless channels at the bitstream level, avoiding the often computationally complex step of transcoding between networks that could deteriorate decoded video quality. The framework also allows for graceful degradation of video quality when the network conditions are poor due to congestion or deep fades.
{"title":"Progressive video transmission over a wired-to-wireless network","authors":"R. Anand, C. Podilchuk, H. Lou","doi":"10.1109/VETECS.2000.851707","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851707","url":null,"abstract":"Advances in mobile computing, combined with the increasing demand for multimedia services on mobile terminals have generated much interest in error-resilient video transmission over wireless networks. Much of the work on video transmission has focused on either dealing with packet losses due to congestion found in IP wireline networks or bit errors and packet losses due to the fading channel environment of a wireless network. Many of the applications for multimedia services will involve video transmission over a wired-to-wireless link and an important research topic is error-resilient video which can adapt to the different conditions found in a wired and wireless environment. The current solutions in transmission of multimedia across different networks include some type of transcoder where the source is partially or fully decoded and re-encoded to suit the network conditions. Here we introduce a flexible progressive source/channel coding framework for video which can adapt to the different conditions imposed by wired and wireless channels at the bitstream level, avoiding the often computationally complex step of transcoding between networks that could deteriorate decoded video quality. The framework also allows for graceful degradation of video quality when the network conditions are poor due to congestion or deep fades.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134192780","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}
Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851308
B. Steiner
The application of transmit antenna diversity (TxAD) to the TDD mode of UMTS is considered. After comparing TxAD with coherent receiver antenna diversity (CRAD) which is used in the uplink of all major digital mobile radio systems, the advantages and drawbacks of TxAD are discussed. Furthermore, simulation results for non-adaptive TxAD techniques are presented. The SNR (signal to noise ratio) gain achievable by the application of TxAD ranges from 0.5 dB to 2.7 dB, depending on the propagation environment as well as the TxAD technique applied.
{"title":"Performance aspects of transmit antenna diversity (TxAD) techniques for UTRA-TDD","authors":"B. Steiner","doi":"10.1109/VETECS.2000.851308","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851308","url":null,"abstract":"The application of transmit antenna diversity (TxAD) to the TDD mode of UMTS is considered. After comparing TxAD with coherent receiver antenna diversity (CRAD) which is used in the uplink of all major digital mobile radio systems, the advantages and drawbacks of TxAD are discussed. Furthermore, simulation results for non-adaptive TxAD techniques are presented. The SNR (signal to noise ratio) gain achievable by the application of TxAD ranges from 0.5 dB to 2.7 dB, depending on the propagation environment as well as the TxAD technique applied.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131723893","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：