Pub Date : 1997-12-17DOI: 10.1109/ICPWC.1997.655494
S. Allen, I. Bezzam, G. Richmond
This paper describes breakthroughs in RF integrated circuits that can drastically reduce the physical size of hand-held communication devices. Product developments in CMOS technology are emphasized so that the cost of the systems using these new ICs is also substantially improved. CMOS technology also offers a common platform to integrate most of the circuitry between the antenna and the audio interface (microphone/speaker). Specific examples are discussed for current and future standards such as GSM, PCS1900, DCS1800, DECT, DCT, and CTII.
{"title":"Cost and size reductions in implementing personal wireless communication transceivers through advances in CMOS RF integrated circuits","authors":"S. Allen, I. Bezzam, G. Richmond","doi":"10.1109/ICPWC.1997.655494","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655494","url":null,"abstract":"This paper describes breakthroughs in RF integrated circuits that can drastically reduce the physical size of hand-held communication devices. Product developments in CMOS technology are emphasized so that the cost of the systems using these new ICs is also substantially improved. CMOS technology also offers a common platform to integrate most of the circuitry between the antenna and the audio interface (microphone/speaker). Specific examples are discussed for current and future standards such as GSM, PCS1900, DCS1800, DECT, DCT, and CTII.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117085710","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655552
B. Cvetkovski, L. Gavrilovska
The deterministic fluid model is used to investigate the behaviour of the mobile along the highway. This paper presents the simulation of a mobile traffic on a one way semi-infinite highway, with multiple entrances and exits, based on a time non-homogeneous model. The system is described with ordinary differential equations, which are solved numerically. The parameters such as calling and noncalling vehicle density, offered traffic load and blocking probability are calculated, assuming different vehicle's velocity patterns. The time and space dynamics of a mobile subscriber highway system is investigated.
{"title":"A simulation of a mobile traffic","authors":"B. Cvetkovski, L. Gavrilovska","doi":"10.1109/ICPWC.1997.655552","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655552","url":null,"abstract":"The deterministic fluid model is used to investigate the behaviour of the mobile along the highway. This paper presents the simulation of a mobile traffic on a one way semi-infinite highway, with multiple entrances and exits, based on a time non-homogeneous model. The system is described with ordinary differential equations, which are solved numerically. The parameters such as calling and noncalling vehicle density, offered traffic load and blocking probability are calculated, assuming different vehicle's velocity patterns. The time and space dynamics of a mobile subscriber highway system is investigated.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124823044","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655481
R. Nilsson, O. Edfors, Magnus Sandell, P. Börjesson
In this paper we analyze two-dimensional (2D) pilot-symbol assisted modulation (PSAM) for wireless orthogonal frequency-division multiplexing (OFDM). 2D-PSAM has been suggested for wireless OFDM by several authors and is included in a preliminary draft of the standard for European digital video broadcast. We generalize the analysis of single-carrier PSAM to the 2D time-frequency lattice of OFDM. We analyze 2D-PSAM for two different channel estimators: one with good performance and high complexity and one suboptimal with low complexity. We verify that a good rule of thumb is to place the pilots at least as twice as close, in time and frequency, as required by the 2D sampling theorem.
{"title":"An analysis of two-dimensional pilot-symbol assisted modulation for OFDM","authors":"R. Nilsson, O. Edfors, Magnus Sandell, P. Börjesson","doi":"10.1109/ICPWC.1997.655481","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655481","url":null,"abstract":"In this paper we analyze two-dimensional (2D) pilot-symbol assisted modulation (PSAM) for wireless orthogonal frequency-division multiplexing (OFDM). 2D-PSAM has been suggested for wireless OFDM by several authors and is included in a preliminary draft of the standard for European digital video broadcast. We generalize the analysis of single-carrier PSAM to the 2D time-frequency lattice of OFDM. We analyze 2D-PSAM for two different channel estimators: one with good performance and high complexity and one suboptimal with low complexity. We verify that a good rule of thumb is to place the pilots at least as twice as close, in time and frequency, as required by the 2D sampling theorem.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127112777","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655567
S.K. Das, S. Sen, P. Agrawal, K. Basu
We propose call degradation and admission strategies based on modeling quality-of-service (QoS) degradation of multirate traffic for third generation multimedia wireless network. The real-time traffic is classified into K classes based on the bandwidth requirements, where a class i call uses i channels. To increase the carried traffic in an overloaded system, some of the ongoing calls release channels that they are using and enter a degraded mode of operation. Two orthogonal QoS parameters called carried traffic and bandwidth degradation are defined, and a cost function describing the total revenue earned by the system from a bandwidth degradation policy is formulated. This cost function model is extended to incorporate a call admission policy, and methods are shown to compute the optimal call admission and degradation policies which maximize the effective revenue earned. Detailed simulation experiments are conducted to validate our proposed model.
{"title":"Modeling QoS degradation in multimedia wireless networks","authors":"S.K. Das, S. Sen, P. Agrawal, K. Basu","doi":"10.1109/ICPWC.1997.655567","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655567","url":null,"abstract":"We propose call degradation and admission strategies based on modeling quality-of-service (QoS) degradation of multirate traffic for third generation multimedia wireless network. The real-time traffic is classified into K classes based on the bandwidth requirements, where a class i call uses i channels. To increase the carried traffic in an overloaded system, some of the ongoing calls release channels that they are using and enter a degraded mode of operation. Two orthogonal QoS parameters called carried traffic and bandwidth degradation are defined, and a cost function describing the total revenue earned by the system from a bandwidth degradation policy is formulated. This cost function model is extended to incorporate a call admission policy, and methods are shown to compute the optimal call admission and degradation policies which maximize the effective revenue earned. Detailed simulation experiments are conducted to validate our proposed model.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"45 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130753008","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655575
Young-Shik Lim, Mi-Hee Kim, Cheol-Hye Cho
This paper describes an approach to software fault detection and recovery in CDMA systems, which is based on the sanity monitoring and auditing techniques. Sanity monitoring is a fault tolerance technique in a distributed system. It detects and recovers from software faults. We discuss how to identify performance classes and fault types for processes, and how to locate and isolate faults. An audit program detects and recovers from data errors in communication systems such as telephone switches. It is adapted to distributed systems. We discuss data error detection and recovery methods for CDMA systems that also use OS primitives.
{"title":"A software fault detection and recovery in CDMA systems","authors":"Young-Shik Lim, Mi-Hee Kim, Cheol-Hye Cho","doi":"10.1109/ICPWC.1997.655575","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655575","url":null,"abstract":"This paper describes an approach to software fault detection and recovery in CDMA systems, which is based on the sanity monitoring and auditing techniques. Sanity monitoring is a fault tolerance technique in a distributed system. It detects and recovers from software faults. We discuss how to identify performance classes and fault types for processes, and how to locate and isolate faults. An audit program detects and recovers from data errors in communication systems such as telephone switches. It is adapted to distributed systems. We discuss data error detection and recovery methods for CDMA systems that also use OS primitives.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127874663","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655525
H. Keller, H. Salzwedel, U. Freund, G. Schorcht
In the next few years, a new generation of mobile satellite systems (MSS) will be available. These systems will use satellites on low Earth orbits (LEO) and on medium Earth orbits (MEO) in order to provide personal communication from (almost) every point on the Earth. A problem of LEO and MEO systems is the time-variant position of the satellites which results from the lower altitude of the satellites. In order to establish intersatellite links (ISLs), it is necessary to know the exact positions of the satellites and to calculate the azimuth and elevation angles of two satellites that are using ISLs. The circular polar satellite constellation is examined for the use of ISLs. It is shown how changes of a special orbit parameter influences the use of ISLs and the probability of visibility. Equations for the azimuth and the elevation angles of two satellites are derived and examinations are presented for an example system, a system that is using ISLs and is based on the circular polar satellite constellation.
{"title":"Examination of the circular polar satellite constellation for the use of intersatellite links","authors":"H. Keller, H. Salzwedel, U. Freund, G. Schorcht","doi":"10.1109/ICPWC.1997.655525","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655525","url":null,"abstract":"In the next few years, a new generation of mobile satellite systems (MSS) will be available. These systems will use satellites on low Earth orbits (LEO) and on medium Earth orbits (MEO) in order to provide personal communication from (almost) every point on the Earth. A problem of LEO and MEO systems is the time-variant position of the satellites which results from the lower altitude of the satellites. In order to establish intersatellite links (ISLs), it is necessary to know the exact positions of the satellites and to calculate the azimuth and elevation angles of two satellites that are using ISLs. The circular polar satellite constellation is examined for the use of ISLs. It is shown how changes of a special orbit parameter influences the use of ISLs and the probability of visibility. Equations for the azimuth and the elevation angles of two satellites are derived and examinations are presented for an example system, a system that is using ISLs and is based on the circular polar satellite constellation.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121601348","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655468
S. Tripathi, A. Kumar
We study a two layer cellular wireless network supporting two mobility classes, and with channel reservation for different types of calls in the two layers. Fast calls are always assigned a channel in the macrolayer; a slow call first attempts to get a channel in the microlayer and, if blocked there, overflows to the macrolayer. Channels are reserved for fast calls in the macrolayer, and for handoff calls in both the layers. Various approximate analyses of an isolated cell are used to iteratively compute the blocking and dropping probabilities, and are compared with simulations. Finally, using a combination of approximate analysis and simulation, we propose a method to design a cellular network with specified grade of service (GoS). Such an approach results in a huge saving of computation time.
{"title":"Performance analysis of microcellisation with channel reservation, for supporting two mobility classes in cellular wireless networks","authors":"S. Tripathi, A. Kumar","doi":"10.1109/ICPWC.1997.655468","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655468","url":null,"abstract":"We study a two layer cellular wireless network supporting two mobility classes, and with channel reservation for different types of calls in the two layers. Fast calls are always assigned a channel in the macrolayer; a slow call first attempts to get a channel in the microlayer and, if blocked there, overflows to the macrolayer. Channels are reserved for fast calls in the macrolayer, and for handoff calls in both the layers. Various approximate analyses of an isolated cell are used to iteratively compute the blocking and dropping probabilities, and are compared with simulations. Finally, using a combination of approximate analysis and simulation, we propose a method to design a cellular network with specified grade of service (GoS). Such an approach results in a huge saving of computation time.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123016774","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655474
C. Casal, A.M. Bravo Santos, V. Bhargava
In this paper the problem of estimating the delay of a new user entering the system is studied. A receiver structure is proposed for the estimation of the transmission delay of the new user, and different structures are used to implement the de-noising algorithms. The detector presented solves the problem of detecting the presence of a new user by making the determination of the difference between the received signal and the expected signal, knowing the previous users. This difference is then used to provide the delay of the new user using a structure based on the performance of the correlation between this difference and a reference signal. This structure will be improved with different de-noising possibilities.
{"title":"Use of wavelet transforms for the delay detection of a new user entering a CDMA communications system","authors":"C. Casal, A.M. Bravo Santos, V. Bhargava","doi":"10.1109/ICPWC.1997.655474","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655474","url":null,"abstract":"In this paper the problem of estimating the delay of a new user entering the system is studied. A receiver structure is proposed for the estimation of the transmission delay of the new user, and different structures are used to implement the de-noising algorithms. The detector presented solves the problem of detecting the presence of a new user by making the determination of the difference between the received signal and the expected signal, knowing the previous users. This difference is then used to provide the delay of the new user using a structure based on the performance of the correlation between this difference and a reference signal. This structure will be improved with different de-noising possibilities.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124900190","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655545
Y. Jeong, J. Chung
The wireless local loop (WLL) is an access system that uses a wireless link to connect subscribers to their local exchange in place of conventional copper cable. We propose a common air interface for a wideband CDMA WLL system. This paper describes the design and implementation of a digital receiver ASIC for the proposed wideband CDMA WLL system. The proposed reverse link transmitter structure is described followed by the design specification of the reverse link receiver. The operation of the implemented reverse link receiver ASIC is verified by the system timing simulation. The total gate number of the receiver ASIC including the code acquisition module, code tracking and data demodulation module, and the Viterbi decoder module is about 150,000. For the purpose of the ASIC implementation, 0.6 /spl mu/m CMOS technology is used. The implemented reverse link receiver ASIC can operate at clock frequencies of up to 65.536 MHz.
{"title":"Reverse link receiver ASIC for wideband CDMA WLL system","authors":"Y. Jeong, J. Chung","doi":"10.1109/ICPWC.1997.655545","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655545","url":null,"abstract":"The wireless local loop (WLL) is an access system that uses a wireless link to connect subscribers to their local exchange in place of conventional copper cable. We propose a common air interface for a wideband CDMA WLL system. This paper describes the design and implementation of a digital receiver ASIC for the proposed wideband CDMA WLL system. The proposed reverse link transmitter structure is described followed by the design specification of the reverse link receiver. The operation of the implemented reverse link receiver ASIC is verified by the system timing simulation. The total gate number of the receiver ASIC including the code acquisition module, code tracking and data demodulation module, and the Viterbi decoder module is about 150,000. For the purpose of the ASIC implementation, 0.6 /spl mu/m CMOS technology is used. The implemented reverse link receiver ASIC can operate at clock frequencies of up to 65.536 MHz.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125173766","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 : 1997-12-17DOI: 10.1109/ICPWC.1997.655480
M. Varanasi, T. Guess
A new bandwidth efficient multiple access (BEMA) scheme for mobile radio is introduced. It offers a higher spectral efficiency than dynamic time division multiple access. This idea must be understood from the viewpoint that BEMA results from optimizing over a class of correlated waveform multiple access (CWMA) strategies that includes TDMA as a special case. At the heart of this new BEMA technique are signal processing algorithms that realize the functions of multiuser equalization and signal design, and which are developed by taking a new and combined approach to those two problems.
{"title":"Bandwidth-efficient multiple-access communications","authors":"M. Varanasi, T. Guess","doi":"10.1109/ICPWC.1997.655480","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655480","url":null,"abstract":"A new bandwidth efficient multiple access (BEMA) scheme for mobile radio is introduced. It offers a higher spectral efficiency than dynamic time division multiple access. This idea must be understood from the viewpoint that BEMA results from optimizing over a class of correlated waveform multiple access (CWMA) strategies that includes TDMA as a special case. At the heart of this new BEMA technique are signal processing algorithms that realize the functions of multiuser equalization and signal design, and which are developed by taking a new and combined approach to those two problems.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122398292","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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