Pub Date : 1997-09-01DOI: 10.1109/PIMRC.1997.630951
D. Calin, D. Zeghlache
An analytical model for a nonpreemptive priority queueing system incorporating voice and data users in cellular mobile networks is presented. Upon arrival, handoff requests are inserted in a head of line (HOL) queue with finite capacity if no idle channels are available and the queue is not full. Priority is given to voice handoffs over data handoffs to avoid forced termination for voice users. This is achieved under a given time delay constraint for data users. A number of channels can be reserved for handover exclusive use. New attempts which find channels occupied are cleared from the system. For this priority policy we conduct a steady state queueing analysis when the mean service times of voice and data are different. Performance results show blocking and forced termination probabilities for both types of calls, waiting time for voice calls in the handoff area and delay experienced by data calls.
{"title":"Performance and handoff analysis of an integrated voice-data cellular system","authors":"D. Calin, D. Zeghlache","doi":"10.1109/PIMRC.1997.630951","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.630951","url":null,"abstract":"An analytical model for a nonpreemptive priority queueing system incorporating voice and data users in cellular mobile networks is presented. Upon arrival, handoff requests are inserted in a head of line (HOL) queue with finite capacity if no idle channels are available and the queue is not full. Priority is given to voice handoffs over data handoffs to avoid forced termination for voice users. This is achieved under a given time delay constraint for data users. A number of channels can be reserved for handover exclusive use. New attempts which find channels occupied are cleared from the system. For this priority policy we conduct a steady state queueing analysis when the mean service times of voice and data are different. Performance results show blocking and forced termination probabilities for both types of calls, waiting time for voice calls in the handoff area and delay experienced by data calls.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132711067","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.627020
Ya-Ku Sun, Kwang-Cheng Chen, Dsun-Chie Twu
A general multi-layer collision avoidance/resolution (MULCAR) protocol for multiple access in packet switching networks is proposed. Such a scheme possesses great flexibility and can be widely applied in wireless or even wire-based networks, by adequate tailoring of the layers and adjustment of the parameters accordingly. It is originated from the savvy of a classification of historical multi-access protocols by the tree-expansion point of view, which includes collision anticipation tree expansion (CATE) and collision resolution tree expansion (CRTE). Therefore, MULCAR basically possesses the competence of exploring the insight of general multiple access problem.
{"title":"Generalized tree multiple access protocols in packet switching networks","authors":"Ya-Ku Sun, Kwang-Cheng Chen, Dsun-Chie Twu","doi":"10.1109/PIMRC.1997.627020","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627020","url":null,"abstract":"A general multi-layer collision avoidance/resolution (MULCAR) protocol for multiple access in packet switching networks is proposed. Such a scheme possesses great flexibility and can be widely applied in wireless or even wire-based networks, by adequate tailoring of the layers and adjustment of the parameters accordingly. It is originated from the savvy of a classification of historical multi-access protocols by the tree-expansion point of view, which includes collision anticipation tree expansion (CATE) and collision resolution tree expansion (CRTE). Therefore, MULCAR basically possesses the competence of exploring the insight of general multiple access problem.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115193106","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.627021
T. Kobayashi, I. Sasase
For local wireless communications, the packet reservation multiple access (PRMA) protocol, which combines random access with time division access, has been proposed and analyzed. The study results shows that the performance of PRMA is degraded in the heavy load condition because of the contention mechanism of random access. We propose the use of an adaptive array antenna with the PRMA protocol to improve the performance. In the proposed model, the adaptive array can acquire a packet by pointing the peak antenna pattern toward that packet even when a collision occurs. We evaluate the throughput performance by a theoretical analysis. We also evaluate the throughput and the packet dropping probability by computer simulation. It is shown that the proposed model attains a higher throughput and lower packet dropping probability than the conventional PRMA.
{"title":"Performance analysis of packet reservation multiple access with an adaptive array","authors":"T. Kobayashi, I. Sasase","doi":"10.1109/PIMRC.1997.627021","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627021","url":null,"abstract":"For local wireless communications, the packet reservation multiple access (PRMA) protocol, which combines random access with time division access, has been proposed and analyzed. The study results shows that the performance of PRMA is degraded in the heavy load condition because of the contention mechanism of random access. We propose the use of an adaptive array antenna with the PRMA protocol to improve the performance. In the proposed model, the adaptive array can acquire a packet by pointing the peak antenna pattern toward that packet even when a collision occurs. We evaluate the throughput performance by a theoretical analysis. We also evaluate the throughput and the packet dropping probability by computer simulation. It is shown that the proposed model attains a higher throughput and lower packet dropping probability than the conventional PRMA.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115636202","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.627032
Yuichi Tanaka, M. Nakagawa
In indoor optical channels, intersymbol interference (ISI) due to the multipath propagation prevents high data rate transmission. A new optical multi-wavelength PPM (pulse position modulation) has been investigated for improving the quality of transmission. In this strategy, parallel transmission is accomplished which lowers the data rate per channel and thus reduces the effect of ISI. Furthermore, this strategy also implements a parallel coding technique in the predetermined parallel branches. This parallel coding corrects errors without changing the system data rate. The simulation results show that a combination of these methods can achieve high quality transmission without reduction of the total data rate.
{"title":"Optical multi-wavelength PPM for high data rate transmission on indoor channels","authors":"Yuichi Tanaka, M. Nakagawa","doi":"10.1109/PIMRC.1997.627032","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627032","url":null,"abstract":"In indoor optical channels, intersymbol interference (ISI) due to the multipath propagation prevents high data rate transmission. A new optical multi-wavelength PPM (pulse position modulation) has been investigated for improving the quality of transmission. In this strategy, parallel transmission is accomplished which lowers the data rate per channel and thus reduces the effect of ISI. Furthermore, this strategy also implements a parallel coding technique in the predetermined parallel branches. This parallel coding corrects errors without changing the system data rate. The simulation results show that a combination of these methods can achieve high quality transmission without reduction of the total data rate.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124181711","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.627003
H. Habuchi, T. Takebayashi, T. Hasegawa
In this paper, a frame synchronization method using the differential detector and racing counters is proposed. Moreover, the synchronization performance of the proposed system is discussed. In particular, the lose lock time, the recovery time and the BER performance considering the synchronizing performance are analyzed. In consequence, the BER performance considering the synchronization performance can approach the lower bound of the spread spectrum constrained spreading code (SS-CSC) system by tuning the number of the stages in the racing counters.
{"title":"A synchronization system with differential detector for the SS-CSC system","authors":"H. Habuchi, T. Takebayashi, T. Hasegawa","doi":"10.1109/PIMRC.1997.627003","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.627003","url":null,"abstract":"In this paper, a frame synchronization method using the differential detector and racing counters is proposed. Moreover, the synchronization performance of the proposed system is discussed. In particular, the lose lock time, the recovery time and the BER performance considering the synchronizing performance are analyzed. In consequence, the BER performance considering the synchronization performance can approach the lower bound of the spread spectrum constrained spreading code (SS-CSC) system by tuning the number of the stages in the racing counters.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124511952","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.624392
C. Tellambura
An analytic technique is presented for computing the performance of trellis coded q-ary PSK in Rayleigh fading. A contour-integral expression for the pairwise error probability (PEP) is used to define a transfer function, enabling the union bound to be evaluated exactly for the ideal CSI (channel state information) case and imperfect-CSI case. The case of TCM in Nakagami fading and dual diversity reception is also analysed.
{"title":"The performance of trellis coded q-ary PSK in Rayleigh fading and Nakagami fading with dual diversity reception","authors":"C. Tellambura","doi":"10.1109/PIMRC.1997.624392","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624392","url":null,"abstract":"An analytic technique is presented for computing the performance of trellis coded q-ary PSK in Rayleigh fading. A contour-integral expression for the pairwise error probability (PEP) is used to define a transfer function, enabling the union bound to be evaluated exactly for the ideal CSI (channel state information) case and imperfect-CSI case. The case of TCM in Nakagami fading and dual diversity reception is also analysed.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114854719","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.624387
M. Wolf, K. Iversen
For high speed and low-power wireless ATM-terminals with low mobility a system approach using direct-beam infrared (IR) links is proposed. We show that cell sizes, data-rates and power budgets comparable to mm-wave radio systems are possible. We suggest a technique to estimate direction-of-arrival which can be combined favourably with the proposed media access scheme. Calculations for the required optical power assuming a throughput of 500 Mb/s are presented.
{"title":"Wireless access to ATM-networks based on direct-beam infrared links","authors":"M. Wolf, K. Iversen","doi":"10.1109/PIMRC.1997.624387","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624387","url":null,"abstract":"For high speed and low-power wireless ATM-terminals with low mobility a system approach using direct-beam infrared (IR) links is proposed. We show that cell sizes, data-rates and power budgets comparable to mm-wave radio systems are possible. We suggest a technique to estimate direction-of-arrival which can be combined favourably with the proposed media access scheme. Calculations for the required optical power assuming a throughput of 500 Mb/s are presented.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123590201","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.631077
M. Latva-aho, M. Juntti
Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant receivers in direct-sequence code-division multiple-access (DS-CDMA) systems. The standard version of the LMMSE detector depends on the channel coefficients of all users and cannot be used in frequency-selective fading channels due to fast changes of channel phases which demands for continuous detector updating. In this paper, a modified criterion for deriving LMMSE receivers in fading channels is used, which effectively converts the pathological Rayleigh fading channel to an equivalent fixed AWGN channel from the detector point of view. Thus, the detector is independent from the user's complex channel coefficients. Adaptive versions of the modified LMMSE receiver require estimation of channel delays and complex coefficients. An adaptive least mean squares (LMS) algorithm for DS-CDMA downlink receivers utilizing a pilot channel for channel estimation is presented as an example of a practical implementation of the scheme. The numerical results show that the modified criterion can be applied in downlink receivers in fading channels and the adaptive version converges close to the optimal LMMSE solution.
{"title":"Modified adaptive LMMSE receiver for DS-CDMA systems in fading channels","authors":"M. Latva-aho, M. Juntti","doi":"10.1109/PIMRC.1997.631077","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.631077","url":null,"abstract":"Linear minimum mean squared error (LMMSE) criterion can be used to obtain near-far resistant receivers in direct-sequence code-division multiple-access (DS-CDMA) systems. The standard version of the LMMSE detector depends on the channel coefficients of all users and cannot be used in frequency-selective fading channels due to fast changes of channel phases which demands for continuous detector updating. In this paper, a modified criterion for deriving LMMSE receivers in fading channels is used, which effectively converts the pathological Rayleigh fading channel to an equivalent fixed AWGN channel from the detector point of view. Thus, the detector is independent from the user's complex channel coefficients. Adaptive versions of the modified LMMSE receiver require estimation of channel delays and complex coefficients. An adaptive least mean squares (LMS) algorithm for DS-CDMA downlink receivers utilizing a pilot channel for channel estimation is presented as an example of a practical implementation of the scheme. The numerical results show that the modified criterion can be applied in downlink receivers in fading channels and the adaptive version converges close to the optimal LMMSE solution.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"609 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121980258","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.624360
Fredrik Ovesjö, E. Dahlman, Tero Ojanperä, A. Toskala, A. Klein
An evaluation of several multiple access schemes against UMTS criteria has been carried out within the European FRAMES project. Based on this comprehensive evaluation, a harmonised multiple access platform termed FRAMES multiple access (FMA) has been designed consisting of two modes: a wideband TDMA mode with and without spreading (FMA 1), and a wideband CDMA mode (FMA 2). This paper describes the FMA 2 radio access system proposal. The FMA 1 proposal is described in Ovesjo (1997).
{"title":"FRAMES multiple access mode 2-wideband CDMA","authors":"Fredrik Ovesjö, E. Dahlman, Tero Ojanperä, A. Toskala, A. Klein","doi":"10.1109/PIMRC.1997.624360","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624360","url":null,"abstract":"An evaluation of several multiple access schemes against UMTS criteria has been carried out within the European FRAMES project. Based on this comprehensive evaluation, a harmonised multiple access platform termed FRAMES multiple access (FMA) has been designed consisting of two modes: a wideband TDMA mode with and without spreading (FMA 1), and a wideband CDMA mode (FMA 2). This paper describes the FMA 2 radio access system proposal. The FMA 1 proposal is described in Ovesjo (1997).","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122108234","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 : 1997-09-01DOI: 10.1109/PIMRC.1997.624369
U. Martin, I. Gaspard
A standard-compatible upgrade of IS95-CDMA base station (BS) transceivers by smart antennas can at least double the cellular radio capacity at the cost of a moderately increased transceiver complexity. This is demonstrated for the adoption of a beam diversity concept. At the sectorized BS, uniform linear antenna arrays are employed. An intelligent adaptive receiver antenna is implemented based on the DFT beamspace transform and angular-temporal RAKE combining. Downlink transmission utilizes beam selection. In Monte-Carlo-based performance assessments a special point of emphasis is put on the real-world-like modeling of the directional radio propagation phenomena. Small and large area channel models for densely built-up urban macro-cells are used which were determined from the results of a spatio-temporally sensitive sounding campaign at 1.9 GHz. Thus, the analysis results are valid for the important application case of larger urban cells operated in the PCS and IMT-2000 bands.
{"title":"Capacity enhancement of narrowband CDMA by intelligent antennas","authors":"U. Martin, I. Gaspard","doi":"10.1109/PIMRC.1997.624369","DOIUrl":"https://doi.org/10.1109/PIMRC.1997.624369","url":null,"abstract":"A standard-compatible upgrade of IS95-CDMA base station (BS) transceivers by smart antennas can at least double the cellular radio capacity at the cost of a moderately increased transceiver complexity. This is demonstrated for the adoption of a beam diversity concept. At the sectorized BS, uniform linear antenna arrays are employed. An intelligent adaptive receiver antenna is implemented based on the DFT beamspace transform and angular-temporal RAKE combining. Downlink transmission utilizes beam selection. In Monte-Carlo-based performance assessments a special point of emphasis is put on the real-world-like modeling of the directional radio propagation phenomena. Small and large area channel models for densely built-up urban macro-cells are used which were determined from the results of a spatio-temporally sensitive sounding campaign at 1.9 GHz. Thus, the analysis results are valid for the important application case of larger urban cells operated in the PCS and IMT-2000 bands.","PeriodicalId":362340,"journal":{"name":"Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128476856","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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