Pub Date : 1998-10-05DOI: 10.1109/ICUPC.1998.733638
J.J. Gaytan, D. Murioz-Rodriguez
In order to serve traffic hot spots in a CDMA system it is possible to embed a microcell with minimum frequency planning since CDMA allows universal reuse of frequency; nevertheless interference is raised impacting directly on the system capacity. This work presents an analysis of the effects that microcell coverage area and site location have on the net system capacity. The proposed methodology is flexible to cope with different propagation scenarios and desensitization levels at the microcell site. A study for forward and reverse links has been conducted; analysis of BER dependence on microcell area and location is also presented. The maximum capacity achievable by the mixed micro/macro cellular system is obtained, numerical results are presented and discussed.
{"title":"Analysis of capacity gain and BER performance for CDMA systems with desensitized embedded microcells","authors":"J.J. Gaytan, D. Murioz-Rodriguez","doi":"10.1109/ICUPC.1998.733638","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733638","url":null,"abstract":"In order to serve traffic hot spots in a CDMA system it is possible to embed a microcell with minimum frequency planning since CDMA allows universal reuse of frequency; nevertheless interference is raised impacting directly on the system capacity. This work presents an analysis of the effects that microcell coverage area and site location have on the net system capacity. The proposed methodology is flexible to cope with different propagation scenarios and desensitization levels at the microcell site. A study for forward and reverse links has been conducted; analysis of BER dependence on microcell area and location is also presented. The maximum capacity achievable by the mixed micro/macro cellular system is obtained, numerical results are presented and discussed.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122184399","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733629
Huan-Bang Li, H. Wakana, M. Tanaka
Block coded modulation (BCM) and multiple BCM (MBCM) combined with an unconventional signal partition are proposed to produce unequal error protection (UEP). The presented BCM and MBCM have the advantage of allowing Viterbi decoding. By increasing the minimum squared Euclidean distance (MSED) and reducing the nearest-neighbor signal sequences, the bit error rate (BER) for important bits is greatly reduced.
{"title":"Unequal error protection using BCM and MBCM with an unconventional partition","authors":"Huan-Bang Li, H. Wakana, M. Tanaka","doi":"10.1109/ICUPC.1998.733629","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733629","url":null,"abstract":"Block coded modulation (BCM) and multiple BCM (MBCM) combined with an unconventional signal partition are proposed to produce unequal error protection (UEP). The presented BCM and MBCM have the advantage of allowing Viterbi decoding. By increasing the minimum squared Euclidean distance (MSED) and reducing the nearest-neighbor signal sequences, the bit error rate (BER) for important bits is greatly reduced.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115819856","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733029
P. Forster, T. Asté, L. Féty
There has been a great interest recently in multisensors receivers for reducing co-channel interference (CCI) in mobile radio communication systems like GSM. This paper first generalises the efficient multichannel maximum likelihood sequence estimator (MLSE) receiver introduced for stationary circular Gaussian jammers to the more realistic model for GSM of cyclostationary non-circular jammers (modelling CCI) along with additive stationary circular Gaussian noise. Ideal adaptive structures for estimating the filters involved in the MLSE are then compared. Next, a suboptimal implementation of the resulting receiver is proposed: it consists of a spatio-temporal filter for CCI rejection followed by a Viterbi equalizer for ISI processing. Simulations are performed in the GSM context.
{"title":"Multisensors receivers using a filtered reference: application to GSM","authors":"P. Forster, T. Asté, L. Féty","doi":"10.1109/ICUPC.1998.733029","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733029","url":null,"abstract":"There has been a great interest recently in multisensors receivers for reducing co-channel interference (CCI) in mobile radio communication systems like GSM. This paper first generalises the efficient multichannel maximum likelihood sequence estimator (MLSE) receiver introduced for stationary circular Gaussian jammers to the more realistic model for GSM of cyclostationary non-circular jammers (modelling CCI) along with additive stationary circular Gaussian noise. Ideal adaptive structures for estimating the filters involved in the MLSE are then compared. Next, a suboptimal implementation of the resulting receiver is proposed: it consists of a spatio-temporal filter for CCI rejection followed by a Viterbi equalizer for ISI processing. Simulations are performed in the GSM context.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131770030","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733046
F. Nuno, Y. Matsumoto
This paper explores virtual destination (VD)/virtual source (VS)-based available bit rate (ABR) flow control performance, targeting wireless asynchronous transfer mode (WATM) application that can incur long link-delays because of employing radio-medium sharing and/or radio-specific data link control schemes. As this paper reveals, the conventional VD/VS scheme has difficulty in sustaining satisfactory ABR performance, when it is applied to long-delay-causing WATM; it suffers from significant increase in the necessary buffer capacity. To ensure the ABR performance in WATM, this paper proposes a new VD/VS coupling scheme using a feed-forward congestion indication. The proposed scheme controls the allowed cell rate of a source end system in a feed-forward manner by predicting the queue length at the time the WATM-associated-round-trip ahead. Simulation results show that the proposed scheme exhibits excellent ABR performance with a long delay of the divided loop on the radio link side. It is also verified that the proposed scheme is rather robust against uncertainty and/or time-variation regarding the predetermined radio link delay.
{"title":"VD/VS coupling scheme using feed-forward congestion indication for ABR services in wireless ATM","authors":"F. Nuno, Y. Matsumoto","doi":"10.1109/ICUPC.1998.733046","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733046","url":null,"abstract":"This paper explores virtual destination (VD)/virtual source (VS)-based available bit rate (ABR) flow control performance, targeting wireless asynchronous transfer mode (WATM) application that can incur long link-delays because of employing radio-medium sharing and/or radio-specific data link control schemes. As this paper reveals, the conventional VD/VS scheme has difficulty in sustaining satisfactory ABR performance, when it is applied to long-delay-causing WATM; it suffers from significant increase in the necessary buffer capacity. To ensure the ABR performance in WATM, this paper proposes a new VD/VS coupling scheme using a feed-forward congestion indication. The proposed scheme controls the allowed cell rate of a source end system in a feed-forward manner by predicting the queue length at the time the WATM-associated-round-trip ahead. Simulation results show that the proposed scheme exhibits excellent ABR performance with a long delay of the divided loop on the radio link side. It is also verified that the proposed scheme is rather robust against uncertainty and/or time-variation regarding the predetermined radio link delay.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134325392","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.732846
D. Calin
A probabilistic model for evaluating the blocking and forced termination probabilities for voice and data calls in wireless communication networks is presented. Ongoing traffic can access a waiting queue and reserved guard channels for their own use to reduce the forced termination probability. Priority is given to voice handoffs over data handoffs. The objective of this traffic policy is to achieve higher quality of service (QoS) for voice, while maintaining low deterioration for data calls and keeping good utilization of the mobile network. The model can be applied when the mean service times for voice and data are different. The analysis is validated by results obtained from a comprehensive simulation.
{"title":"A probabilistic model for handling voice and data traffic in wireless networks","authors":"D. Calin","doi":"10.1109/ICUPC.1998.732846","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732846","url":null,"abstract":"A probabilistic model for evaluating the blocking and forced termination probabilities for voice and data calls in wireless communication networks is presented. Ongoing traffic can access a waiting queue and reserved guard channels for their own use to reduce the forced termination probability. Priority is given to voice handoffs over data handoffs. The objective of this traffic policy is to achieve higher quality of service (QoS) for voice, while maintaining low deterioration for data calls and keeping good utilization of the mobile network. The model can be applied when the mean service times for voice and data are different. The analysis is validated by results obtained from a comprehensive simulation.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133744634","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733709
M. Vasudevan, S. Faruque
This paper presents a smooth transition scheme for frequency planning when capacity enhancement is envisaged in existing AMPS-TDMA cellular networks. To meet growth requirements, it is often required to adopt reuse schemes with smaller reuse distances, and this in turn results in modification of the existing frequency plan. The proposed frequency transition scheme allows for gradual expansion, smooth transition and also unobtrusive co-existence offering minimal disturbance to the existing network. The plan also allows fractional reduction in cluster size and has the flexibility to adapt to varying traffic growth requirements.
{"title":"A novel frequency transition scheme for capacity enhancement in a cellular radio system","authors":"M. Vasudevan, S. Faruque","doi":"10.1109/ICUPC.1998.733709","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733709","url":null,"abstract":"This paper presents a smooth transition scheme for frequency planning when capacity enhancement is envisaged in existing AMPS-TDMA cellular networks. To meet growth requirements, it is often required to adopt reuse schemes with smaller reuse distances, and this in turn results in modification of the existing frequency plan. The proposed frequency transition scheme allows for gradual expansion, smooth transition and also unobtrusive co-existence offering minimal disturbance to the existing network. The plan also allows fractional reduction in cluster size and has the flexibility to adapt to varying traffic growth requirements.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117131998","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733633
H. Matsue, M. Umehira, T. Murase
The system concept of ATM wireless access is presented, and technical issues on ATM wireless access are clarified. An ATM wireless access prototype based on the concept is developed. This paper describes design and performance of the prototype.
{"title":"Design and performance of ATM wireless access prototype","authors":"H. Matsue, M. Umehira, T. Murase","doi":"10.1109/ICUPC.1998.733633","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733633","url":null,"abstract":"The system concept of ATM wireless access is presented, and technical issues on ATM wireless access are clarified. An ATM wireless access prototype based on the concept is developed. This paper describes design and performance of the prototype.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116000306","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733711
Jean Tourrilhes
This paper presents a scheme to improve the performance of radio MAC protocols in the case of TCP/IP multimedia traffic and small packets. First, the performance problems with small packets and their consequences are analysed. Then the packet frame grouping scheme is presented, which is shown to improve the throughput and reduce the latency over MAC protocols based on CSMA/CA. Finally, the new protocol is simulated in various realistic scenarios to show its impact on different traffic types.
{"title":"Packet frame grouping: improving IP multimedia performance over CSMA/CA","authors":"Jean Tourrilhes","doi":"10.1109/ICUPC.1998.733711","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733711","url":null,"abstract":"This paper presents a scheme to improve the performance of radio MAC protocols in the case of TCP/IP multimedia traffic and small packets. First, the performance problems with small packets and their consequences are analysed. Then the packet frame grouping scheme is presented, which is shown to improve the throughput and reduce the latency over MAC protocols based on CSMA/CA. Finally, the new protocol is simulated in various realistic scenarios to show its impact on different traffic types.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116128808","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.733027
F. Vatalaro, F. Mazzenga, A. Di Rocco
A DECT base station architecture is presented which allows to enlarge the coverage area and/or to improve the transmission quality both in uplink and in downlink, without any impact on the DECT user terminal. In accordance with the proposed architecture the base station received uplink signal is first equalized before decision and is also used to obtain an estimate of the transmission channel. This estimate is subsequently used to precompensate the downlink signal before transmission. The paper illustrates the architecture of the proposed system and its functional behavior. Performance improvement due to equalization, channel estimation and precompensation under severe multipath conditions is shown through computer simulation.
{"title":"A technique to improve DECT transmission quality and coverage","authors":"F. Vatalaro, F. Mazzenga, A. Di Rocco","doi":"10.1109/ICUPC.1998.733027","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733027","url":null,"abstract":"A DECT base station architecture is presented which allows to enlarge the coverage area and/or to improve the transmission quality both in uplink and in downlink, without any impact on the DECT user terminal. In accordance with the proposed architecture the base station received uplink signal is first equalized before decision and is also used to obtain an estimate of the transmission channel. This estimate is subsequently used to precompensate the downlink signal before transmission. The paper illustrates the architecture of the proposed system and its functional behavior. Performance improvement due to equalization, channel estimation and precompensation under severe multipath conditions is shown through computer simulation.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115026777","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 : 1998-10-05DOI: 10.1109/ICUPC.1998.732816
M. Mizoguchi, T. Onizawa, T. Kumagai, H. Takanashi, M. Morikura
This paper proposes a burst synchronization scheme with a short preamble signal for high data rate wireless LAN systems that use orthogonal frequency division multiplexing (OFDM). The proposed scheme, which consists of automatic frequency control (AFC) and symbol timing detection, enables us to shorten the preamble length to 1/4 that of a conventional one. Computer simulation results show that the degradation in required E/sub b//N/sub 0/ due to the synchronization scheme is less than 1 dB in a selective Rayleigh fading channel.
{"title":"A fast burst synchronization scheme for OFDM","authors":"M. Mizoguchi, T. Onizawa, T. Kumagai, H. Takanashi, M. Morikura","doi":"10.1109/ICUPC.1998.732816","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732816","url":null,"abstract":"This paper proposes a burst synchronization scheme with a short preamble signal for high data rate wireless LAN systems that use orthogonal frequency division multiplexing (OFDM). The proposed scheme, which consists of automatic frequency control (AFC) and symbol timing detection, enables us to shorten the preamble length to 1/4 that of a conventional one. Computer simulation results show that the degradation in required E/sub b//N/sub 0/ due to the synchronization scheme is less than 1 dB in a selective Rayleigh fading channel.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115207867","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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