Pub Date : 2000-12-17DOI: 10.1109/ICPWC.2000.905809
J.B. Reddy, L. Deneire, L. Van der Perre, B. Gyselinckx, M. Engels
Dedicated short range communication (DSRC) applications need flexible and robust air interface technology to support high data rate services. OFDM is a good candidate for DSRC applications in harsh mobile environments, with time and frequency-selective channels. This doubly spread channel renders channel estimation, needed for the equalizer when using coherent detection, a challenging problem. We focus on the the channel estimation methods for coherent detection of QAM signals. Two adaptive algorithms, NLMS and RLS are considered for the rotating pilot (RP) scheme and the repeated reference (RR) scheme to track the channel variations. Further maximum likelihood (ML) deterministic channel estimation is applied jointly with the above methods to get optimal channel estimation. The combination of NLMS and ML is best suited for an OFDM-DSRC modem with rather low complexity and a performance loss of only 1 dB with respect to a perfect channel knowledge situation.
{"title":"On equalization for OFDM-dedicated short range communication (DSRC) modem","authors":"J.B. Reddy, L. Deneire, L. Van der Perre, B. Gyselinckx, M. Engels","doi":"10.1109/ICPWC.2000.905809","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905809","url":null,"abstract":"Dedicated short range communication (DSRC) applications need flexible and robust air interface technology to support high data rate services. OFDM is a good candidate for DSRC applications in harsh mobile environments, with time and frequency-selective channels. This doubly spread channel renders channel estimation, needed for the equalizer when using coherent detection, a challenging problem. We focus on the the channel estimation methods for coherent detection of QAM signals. Two adaptive algorithms, NLMS and RLS are considered for the rotating pilot (RP) scheme and the repeated reference (RR) scheme to track the channel variations. Further maximum likelihood (ML) deterministic channel estimation is applied jointly with the above methods to get optimal channel estimation. The combination of NLMS and ML is best suited for an OFDM-DSRC modem with rather low complexity and a performance loss of only 1 dB with respect to a perfect channel knowledge situation.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131153330","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905922
F. Sestini
The objective of this paper is to summarise the most advanced projects currently funded under the IST (information society technologies) programme of the European Commission, in the domain of mobile and personal communications and satellite systems. The research priorities for the next years related to wireless communications are then explained with reference to the projects already approved in each specific area.
{"title":"European R&D beyond third generation mobile communication systems","authors":"F. Sestini","doi":"10.1109/ICPWC.2000.905922","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905922","url":null,"abstract":"The objective of this paper is to summarise the most advanced projects currently funded under the IST (information society technologies) programme of the European Commission, in the domain of mobile and personal communications and satellite systems. The research priorities for the next years related to wireless communications are then explained with reference to the projects already approved in each specific area.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115374818","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905804
T. Janevski, B. Spasenovski
The Internet should allow introduction of multimedia in cellular networks, which are voice-oriented. The mobility of the users and different traffic types are introducing quality of service support in wireless IP environments. The features of IP, under the conditions in cellular networks and additional classification of the traffic, is the key element. QoS in packet networks is considered by admission control at the start of a call and QoS mechanisms for QoS support during its lifetime. Here we have made analyses considering the admission of different flows in the wireless part.
{"title":"QoS analyses of multimedia traffic in heterogeneous wireless IP networks","authors":"T. Janevski, B. Spasenovski","doi":"10.1109/ICPWC.2000.905804","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905804","url":null,"abstract":"The Internet should allow introduction of multimedia in cellular networks, which are voice-oriented. The mobility of the users and different traffic types are introducing quality of service support in wireless IP environments. The features of IP, under the conditions in cellular networks and additional classification of the traffic, is the key element. QoS in packet networks is considered by admission control at the start of a call and QoS mechanisms for QoS support during its lifetime. Here we have made analyses considering the admission of different flows in the wireless part.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124249423","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905807
Haifeng Wang, Z. Bu, J. Lilleberg
This paper develops an improved generalized multistage multiuser detector that uses the partial interference cancellation approach developed by Divsalar. The detector that is proposed for uplink code-division multiple access systems uses the generalized multistage detector to produce the estimates of the received data. The regenerated multiuser interference is then weighted proportionally to the reliabilities and subtracted. The performance of the matched filter, the conventional multistage multiuser detector, the partial parallel interference cancellation detector and the proposed new detector are evaluated in Rayleigh fading channels. Finally, bit error rate results are presented versus signal-to-noise ratio. It shows that considerable improvement can be achieved by the proposed scheme in heavily loaded systems.
{"title":"Improved generalized multistage multiuser detector with partial parallel interference cancellation for uplink CDMA systems","authors":"Haifeng Wang, Z. Bu, J. Lilleberg","doi":"10.1109/ICPWC.2000.905807","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905807","url":null,"abstract":"This paper develops an improved generalized multistage multiuser detector that uses the partial interference cancellation approach developed by Divsalar. The detector that is proposed for uplink code-division multiple access systems uses the generalized multistage detector to produce the estimates of the received data. The regenerated multiuser interference is then weighted proportionally to the reliabilities and subtracted. The performance of the matched filter, the conventional multistage multiuser detector, the partial parallel interference cancellation detector and the proposed new detector are evaluated in Rayleigh fading channels. Finally, bit error rate results are presented versus signal-to-noise ratio. It shows that considerable improvement can be achieved by the proposed scheme in heavily loaded systems.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"419 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120869695","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905861
V. Garg, M. Garg
This paper highlights the key requirements of IMT-2000. The main characteristic of the proposed 3G solution is to satisfy the IMT-2000 requirements. A layered structure based on the Open System Interconnection (OSI) model is discussed to provide multimedia services. The functions of a flexible and efficient MAC/RLC (medium access control/radio link control) sublayer are identified. The paper is concluded by presenting the proposed implementations of the MAC/RLC sublayer in the 3G UMTS system. The MAC protocol has to resolve contention between mobiles accessing the same physical resources and also has to manage the packet access procedure. Since 3G systems will offer services to mobiles having varying QoS requirements, the MAC will need to be capable of managing the access demands of different users and different service classes. This can be achieved by using reservation and priority schemes. Delay sensitive services can use a capacity reservation scheme to guarantee quality of service. Priority schemes can be used to prioritize the requests from different services.
{"title":"Role of MAC/RLC in achieving higher data rates and QoS in third generation (3G) UMTS system","authors":"V. Garg, M. Garg","doi":"10.1109/ICPWC.2000.905861","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905861","url":null,"abstract":"This paper highlights the key requirements of IMT-2000. The main characteristic of the proposed 3G solution is to satisfy the IMT-2000 requirements. A layered structure based on the Open System Interconnection (OSI) model is discussed to provide multimedia services. The functions of a flexible and efficient MAC/RLC (medium access control/radio link control) sublayer are identified. The paper is concluded by presenting the proposed implementations of the MAC/RLC sublayer in the 3G UMTS system. The MAC protocol has to resolve contention between mobiles accessing the same physical resources and also has to manage the packet access procedure. Since 3G systems will offer services to mobiles having varying QoS requirements, the MAC will need to be capable of managing the access demands of different users and different service classes. This can be achieved by using reservation and priority schemes. Delay sensitive services can use a capacity reservation scheme to guarantee quality of service. Priority schemes can be used to prioritize the requests from different services.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116248085","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905925
D. Vergados, A. Liveris, C. Anagnostopoulos, C. Lykou, G. Stassinopoulos
This paper presents an extensive overview of the anticipated role of DECT technology in 3G systems. DECT (digital enhanced cordless telecommunications) is a flexible digital radio access standard for cordless communications in residential, corporate and public environments. DECT caters for voice and data traffic, and contains many forward-looking technical features that allow DECT-based cordless systems to play a central role in important new communications developments such as multimedia access, and interworking with other fixed and wireless services such as ISDN and GSM. This overview is based on most recent standardization work in ETSI and other institutions.
{"title":"New generation features for GSM systems: an overview of DECT technology in 3G mobile communication systems","authors":"D. Vergados, A. Liveris, C. Anagnostopoulos, C. Lykou, G. Stassinopoulos","doi":"10.1109/ICPWC.2000.905925","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905925","url":null,"abstract":"This paper presents an extensive overview of the anticipated role of DECT technology in 3G systems. DECT (digital enhanced cordless telecommunications) is a flexible digital radio access standard for cordless communications in residential, corporate and public environments. DECT caters for voice and data traffic, and contains many forward-looking technical features that allow DECT-based cordless systems to play a central role in important new communications developments such as multimedia access, and interworking with other fixed and wireless services such as ISDN and GSM. This overview is based on most recent standardization work in ETSI and other institutions.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116598683","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905842
K. Soyjaudah, M. Hosany
A technique for combining Huffman code, row and column array (RAC) codes and phase/frequency modulation in order to reduce redundancy, provide error protection and simultaneously to optimise channel bandwidth is presented. It is shown that this scheme provides a reduction in overall complexity as compared to that employing a demodulator followed by a trellis decoder of RAC code and a Huffman decoder. The trellis of the combined codes employing BFSK/MPSK modulation are designed and implemented and their error performances are compared with those employing coded as well as uncoded MPSK modulation. The proposed block coded modulation (BCM) scheme is suitable for both data transmission and information storage.
{"title":"Combined Huffman code, row and column array code and phase/frequency modulation","authors":"K. Soyjaudah, M. Hosany","doi":"10.1109/ICPWC.2000.905842","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905842","url":null,"abstract":"A technique for combining Huffman code, row and column array (RAC) codes and phase/frequency modulation in order to reduce redundancy, provide error protection and simultaneously to optimise channel bandwidth is presented. It is shown that this scheme provides a reduction in overall complexity as compared to that employing a demodulator followed by a trellis decoder of RAC code and a Huffman decoder. The trellis of the combined codes employing BFSK/MPSK modulation are designed and implemented and their error performances are compared with those employing coded as well as uncoded MPSK modulation. The proposed block coded modulation (BCM) scheme is suitable for both data transmission and information storage.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128838966","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905775
A. Karnik, A. Kumar
Bluetooth is an emerging, short range, indoor wireless network technology, based on FH-CDMA/TDD, which allows a collection of devices to form small overlapping networks, called piconets, in an ad hoc fashion. It is likely that the Bluetooth specification may be adopted in the IEEE 802.15 Wireless Personal Area Network standard. In this paper, we present an analysis of the Bluetooth physical layer. We consider a single room office environment (LOS propagation), with a number of piconets distributed in it, In the present work we have focussed only on the interference between piconets. Assuming a uniform distribution of Bluetooth devices in the room, we provide an analysis of the outage probability as a function of the number of overlapping piconets. We then characterise the temporal correlation in the outage process. This leads to an approximation for the mean outage duration. Combining the outage probability with the mean outage duration, we provide a 2-state Markov model for the Bluetooth channel.
{"title":"Performance analysis of the Bluetooth physical layer","authors":"A. Karnik, A. Kumar","doi":"10.1109/ICPWC.2000.905775","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905775","url":null,"abstract":"Bluetooth is an emerging, short range, indoor wireless network technology, based on FH-CDMA/TDD, which allows a collection of devices to form small overlapping networks, called piconets, in an ad hoc fashion. It is likely that the Bluetooth specification may be adopted in the IEEE 802.15 Wireless Personal Area Network standard. In this paper, we present an analysis of the Bluetooth physical layer. We consider a single room office environment (LOS propagation), with a number of piconets distributed in it, In the present work we have focussed only on the interference between piconets. Assuming a uniform distribution of Bluetooth devices in the room, we provide an analysis of the outage probability as a function of the number of overlapping piconets. We then characterise the temporal correlation in the outage process. This leads to an approximation for the mean outage duration. Combining the outage probability with the mean outage duration, we provide a 2-state Markov model for the Bluetooth channel.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126454994","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905771
P. Marichamy, S. Chakrabarti, S. Maskara
For handoff in wireless ATM networks, calls are required to be rerouted because ATM is based on connection oriented services. Many rerouting schemes have been reported in the literature. In order to evaluate their performance, some issues are to be identified and accordingly some parameters need to be defined. In this paper we have considered several performance issues and based on these, we have evaluated the performance of five rerouting schemes. Results of our investigation are reported and discussed in this paper.
{"title":"Performance issues in rerouting for handoff in wireless ATM","authors":"P. Marichamy, S. Chakrabarti, S. Maskara","doi":"10.1109/ICPWC.2000.905771","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905771","url":null,"abstract":"For handoff in wireless ATM networks, calls are required to be rerouted because ATM is based on connection oriented services. Many rerouting schemes have been reported in the literature. In order to evaluate their performance, some issues are to be identified and accordingly some parameters need to be defined. In this paper we have considered several performance issues and based on these, we have evaluated the performance of five rerouting schemes. Results of our investigation are reported and discussed in this paper.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"abs/2306.06920 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125405572","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 : 2000-12-17DOI: 10.1109/ICPWC.2000.905903
S. Gollamudi, Yih-Fang Huang
Nonlinear MMSE multiuser detection has been shown in earlier works to be equivalent to minimum probability of error multiuser detection for systems using binary or M-ary orthogonal signaling. An iterative approximation to nonlinear MMSE multiuser detection, proposed earlier for single-antenna systems, is applied in this paper to CDMA systems with random spreading and multiple receive antennas. The proposed receiver iterates between a bank of nonlinear MMSE beamformers and an interference canceler. The computational complexity of the proposed receiver, including that of the proposed adaptive array response estimation algorithm, is quadratic in the number of antennas, and linear in the number of users and the number of stages of cancellation. Simulation results demonstrate that substantial capacity improvements can be obtained using this receiver with just a single stage of cancellation, compared to receivers that use linear MMSE beamformers and no interference cancellation, and those using interference cancellation but no beamforming.
{"title":"Optimally combined nonlinear MMSE beamforming and interference cancellation for CDMA communications","authors":"S. Gollamudi, Yih-Fang Huang","doi":"10.1109/ICPWC.2000.905903","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905903","url":null,"abstract":"Nonlinear MMSE multiuser detection has been shown in earlier works to be equivalent to minimum probability of error multiuser detection for systems using binary or M-ary orthogonal signaling. An iterative approximation to nonlinear MMSE multiuser detection, proposed earlier for single-antenna systems, is applied in this paper to CDMA systems with random spreading and multiple receive antennas. The proposed receiver iterates between a bank of nonlinear MMSE beamformers and an interference canceler. The computational complexity of the proposed receiver, including that of the proposed adaptive array response estimation algorithm, is quadratic in the number of antennas, and linear in the number of users and the number of stages of cancellation. Simulation results demonstrate that substantial capacity improvements can be obtained using this receiver with just a single stage of cancellation, compared to receivers that use linear MMSE beamformers and no interference cancellation, and those using interference cancellation but no beamforming.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117173414","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：