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.2000.851668
M. Isaka, H. Imai
Hierarchical coding based on adaptive multilevel bit-interleaved channels is discussed. The proposed code construction has advantages in the simplified design, robustness against channel variations and flexibility in matching itself to the associated source encoder. Multilevel coded modulation with multistage decoding, and bit-interleaved coded modulation are special cases of this general framework.
{"title":"Hierarchical coding based on adaptive multilevel bit-interleaved channels","authors":"M. Isaka, H. Imai","doi":"10.1109/VETECS.2000.851668","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851668","url":null,"abstract":"Hierarchical coding based on adaptive multilevel bit-interleaved channels is discussed. The proposed code construction has advantages in the simplified design, robustness against channel variations and flexibility in matching itself to the associated source encoder. Multilevel coded modulation with multistage decoding, and bit-interleaved coded modulation are special cases of this general framework.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"275 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":"115218118","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.2000.851719
B. Olsson
Some investigations of the properties in a scattered field measurement environment have been performed using reference half wave dipoles at 900 MHz. The analysis is based on the assumption that the electromagnetic (EM) field distributions at the antennas could be modelled as uniform in azimuth with vertical Gaussian distributions with zero mean. The results indicate that the scattered field measurement environment, including the method to average over both transmit and receive positions/angles, will give the same measured results as an environment with uniform field distributions in azimuth and Gaussian elevation distribution at both transmit and receive antennas and for both polarizations. The result of the analysis is that the estimated standard deviation of the vertical field distributions (VP and HP) is less than 25 degrees. Also the cross polarization power ratios at the receiver antenna for vertical, horizontal or 60/spl deg/ tilted dipole transmit antennas are estimated to >8 dB, <-8.5 dB and -2 to -3 dB respectively. These results have been partly validated by 3D measurements performed by CPK, Aalborg University. The analysis also includes a phantom that has a mean path gain of about -6.4 dB for a vertical transmit dipole and about -5.8 dB for a horizontal transmit dipole. The cross polarization properties of the phantom seem to be different with the vertical transmit dipole and the horizontal transmit dipole.
{"title":"Simplistic field distribution estimation of a scattered field measurement room","authors":"B. Olsson","doi":"10.1109/VETECS.2000.851719","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851719","url":null,"abstract":"Some investigations of the properties in a scattered field measurement environment have been performed using reference half wave dipoles at 900 MHz. The analysis is based on the assumption that the electromagnetic (EM) field distributions at the antennas could be modelled as uniform in azimuth with vertical Gaussian distributions with zero mean. The results indicate that the scattered field measurement environment, including the method to average over both transmit and receive positions/angles, will give the same measured results as an environment with uniform field distributions in azimuth and Gaussian elevation distribution at both transmit and receive antennas and for both polarizations. The result of the analysis is that the estimated standard deviation of the vertical field distributions (VP and HP) is less than 25 degrees. Also the cross polarization power ratios at the receiver antenna for vertical, horizontal or 60/spl deg/ tilted dipole transmit antennas are estimated to >8 dB, <-8.5 dB and -2 to -3 dB respectively. These results have been partly validated by 3D measurements performed by CPK, Aalborg University. The analysis also includes a phantom that has a mean path gain of about -6.4 dB for a vertical transmit dipole and about -5.8 dB for a horizontal transmit dipole. The cross polarization properties of the phantom seem to be different with the vertical transmit dipole and the horizontal transmit dipole.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"25 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":"115556210","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.2000.851447
X. Huang, C. Tellambura
A multiple access protocol with a co-operative channel (COCH) and a COCH allocation scheme to improve the delay and throughput of a minislot ALOHA reservation protocol is proposed. In it, the request access (RA) message of a mobile terminal (MT) is randomly piggybacked to the base station (BS) through a COCH minislot in the uplink (UL) provided by its assistor MT which is assigned by the BS. The simulation results show that the performance of a two minislot ALOHA reservation protocol is improved by combining itself with a protocol which has one ALOHA RA minislot plus one COCH RA minislot. Under heavy RA traffic load, replacing one ALOHA RA minislot with one COCH RA minislot in a multiple access protocol which has multiple (>3) RA minislots will stabilise the delay-throughput performance of the MRMA protocol even at the normalised throughput of 99%; the average packet delay is nearly at the same level under light throughput. The overhead of one COCH minislot is 1 bit information plus guard time.
{"title":"Minislot reservation MAC protocol with co-operative channel (MRMA/COCH) for wireless packet networks","authors":"X. Huang, C. Tellambura","doi":"10.1109/VETECS.2000.851447","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851447","url":null,"abstract":"A multiple access protocol with a co-operative channel (COCH) and a COCH allocation scheme to improve the delay and throughput of a minislot ALOHA reservation protocol is proposed. In it, the request access (RA) message of a mobile terminal (MT) is randomly piggybacked to the base station (BS) through a COCH minislot in the uplink (UL) provided by its assistor MT which is assigned by the BS. The simulation results show that the performance of a two minislot ALOHA reservation protocol is improved by combining itself with a protocol which has one ALOHA RA minislot plus one COCH RA minislot. Under heavy RA traffic load, replacing one ALOHA RA minislot with one COCH RA minislot in a multiple access protocol which has multiple (>3) RA minislots will stabilise the delay-throughput performance of the MRMA protocol even at the normalised throughput of 99%; the average packet delay is nearly at the same level under light throughput. The overhead of one COCH minislot is 1 bit information plus guard time.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"27 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":"114254875","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}
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