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}
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.1998.733629
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.1998.733711
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.1998.733698
M. Schnell, I. De Broeck
"Interleaved frequency-division multiple-access" (IFDMA) has been introduced which is a new spread-spectrum multiple-access scheme showing several advantages over other multiple-access schemes. In this paper, the application of IFDMA to mobile radio transmission is considered. Especially, the frequency-diversity achievable with IFDMA taking into account the influence of pulse shaping is investigated. As a result, maximum diversity can be achieved with a set of IFDMA parameters which enables maximum-likelihood detection at the receiver. Therefore, maximum-likelihood detection is proposed for IFDMA and investigated using Monte-Carlo simulations. In comparison with multicarrier code-division multiple-access, IFDMA shows an even better performance whereas having additional advantages, such as avoiding large crest factors.
{"title":"Application of IFDMA to mobile radio transmission","authors":"M. Schnell, I. De Broeck","doi":"10.1109/ICUPC.1998.733698","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733698","url":null,"abstract":"\"Interleaved frequency-division multiple-access\" (IFDMA) has been introduced which is a new spread-spectrum multiple-access scheme showing several advantages over other multiple-access schemes. In this paper, the application of IFDMA to mobile radio transmission is considered. Especially, the frequency-diversity achievable with IFDMA taking into account the influence of pulse shaping is investigated. As a result, maximum diversity can be achieved with a set of IFDMA parameters which enables maximum-likelihood detection at the receiver. Therefore, maximum-likelihood detection is proposed for IFDMA and investigated using Monte-Carlo simulations. In comparison with multicarrier code-division multiple-access, IFDMA shows an even better performance whereas having additional advantages, such as avoiding large crest factors.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"201 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":"123028095","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.1998.733638
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.1998.732810
Henry C. B. Chan, V. Leung
An ATM/MAN-based personal communication network (PCN) architecture is presented which combines the broadcast and distributed advantages of metropolitan area networks (MANs) for handling local traffic, and the high speed switching capability of asynchronous transfer mode (ATM) for wide area connectivity. A dynamic bandwidth allocation scheme is employed to integrate different types of traffic over MANs. Simulation results are presented to illustrate the advantages of the integration scheme. We also propose a suffix-dialing method for integrating existing telephone, fax, paging and e-mail services over ATM/MAN-based PCNs using a single personal identity number (PIN).
{"title":"Integrated telephone/fax/paging/e-mail services over ATM/MAN-based personal communication networks","authors":"Henry C. B. Chan, V. Leung","doi":"10.1109/ICUPC.1998.732810","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.732810","url":null,"abstract":"An ATM/MAN-based personal communication network (PCN) architecture is presented which combines the broadcast and distributed advantages of metropolitan area networks (MANs) for handling local traffic, and the high speed switching capability of asynchronous transfer mode (ATM) for wide area connectivity. A dynamic bandwidth allocation scheme is employed to integrate different types of traffic over MANs. Simulation results are presented to illustrate the advantages of the integration scheme. We also propose a suffix-dialing method for integrating existing telephone, fax, paging and e-mail services over ATM/MAN-based PCNs using a single personal identity number (PIN).","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"322 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":"122620666","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.1998.733627
J. Lu, K. B. Letaief, M. Liou, J. Chuang
In this paper, an efficient and reliable transmission system is proposed for multimedia transmission over mobile networks. In particular, multimedia data is represented in terms of its inherent correlation, and the transmission performance is characterized by transmission reliability and efficiency. Consequently, a joint source and channel coding scheme is devised in order to accomplish tradeoffs between transmission efficiency and reliability. Moreover, diversity reception is studied in terms of improved transmission reliability and reduced error protection. Numerical examples with both fixed and variable length coding algorithms are given to demonstrate that the proposed system performs very well under various operation conditions.
{"title":"Multimedia transmission with improved reliability and efficiency for wireless communications","authors":"J. Lu, K. B. Letaief, M. Liou, J. Chuang","doi":"10.1109/ICUPC.1998.733627","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733627","url":null,"abstract":"In this paper, an efficient and reliable transmission system is proposed for multimedia transmission over mobile networks. In particular, multimedia data is represented in terms of its inherent correlation, and the transmission performance is characterized by transmission reliability and efficiency. Consequently, a joint source and channel coding scheme is devised in order to accomplish tradeoffs between transmission efficiency and reliability. Moreover, diversity reception is studied in terms of improved transmission reliability and reduced error protection. Numerical examples with both fixed and variable length coding algorithms are given to demonstrate that the proposed system performs very well under various operation conditions.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"25 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":"125150385","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.1998.733015
D. Shiu, Gérard, J., Foschinit, Michael J. Gamt, Joseph M. Kahn
We investigate the effect of fading correlations in multi-element antenna (MEA) communication systems. The enormous capacity of an MEA system can potentially be reduced by fading correlation. To model the narrowband Rayleigh-fading multipath environment, we propose an abstract model. Using this model, the fading statistics can be determined from the geometrical parameters of the MEA and the multipath environment. This, model allows us to directly observe how the choice of antenna geometry affects capacity. We show that the MEA capacity can be expressed as the sum of the capacities of several subchannels, whose gains are affected by the fading correlation. As the fading correlation becomes higher, the disparity between the gains of these subchannels becomes larger and as a result some of the subchannels do not convey information at any significant rate.
{"title":"Fading correlation and its effect on the capacity of multi-element antenna systems","authors":"D. Shiu, Gérard, J., Foschinit, Michael J. Gamt, Joseph M. Kahn","doi":"10.1109/ICUPC.1998.733015","DOIUrl":"https://doi.org/10.1109/ICUPC.1998.733015","url":null,"abstract":"We investigate the effect of fading correlations in multi-element antenna (MEA) communication systems. The enormous capacity of an MEA system can potentially be reduced by fading correlation. To model the narrowband Rayleigh-fading multipath environment, we propose an abstract model. Using this model, the fading statistics can be determined from the geometrical parameters of the MEA and the multipath environment. This, model allows us to directly observe how the choice of antenna geometry affects capacity. We show that the MEA capacity can be expressed as the sum of the capacities of several subchannels, whose gains are affected by the fading correlation. As the fading correlation becomes higher, the disparity between the gains of these subchannels becomes larger and as a result some of the subchannels do not convey information at any significant rate.","PeriodicalId":341069,"journal":{"name":"ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384)","volume":"5 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":"125556524","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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