Pub Date : 1997-12-17DOI: 10.1109/ICPWC.1997.655562
N. R. Prasad
This paper presents the spectrum efficiency of slotted non-persistent ISMA, 1-persistent ISMA and non-persistent ISMA/CD (collision detection). Computational results are presented, indicating the effect of bandwidth used. The results are important for mobile networks and indoor wireless office communications.
{"title":"Spectrum efficiency of non-persistent ISIMA, 1-persistent ISMA and non-persistent ISMA/CD protocols","authors":"N. R. Prasad","doi":"10.1109/ICPWC.1997.655562","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655562","url":null,"abstract":"This paper presents the spectrum efficiency of slotted non-persistent ISMA, 1-persistent ISMA and non-persistent ISMA/CD (collision detection). Computational results are presented, indicating the effect of bandwidth used. The results are important for mobile networks and indoor wireless office communications.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"48 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":"125845278","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.1997.655572
R. Paul, K. Shah
With the advances made in the areas of digital communication, DSP and VLSI, mobile communication services at affordable rates have become a reality. With the shift to digital communications which provide better spectral utilization, several systems providing mobile cellular telecommunications have emerged. Three standards-GSM, IS-136 and IS-95-have come to be the contenders for mobile communication markets worldwide. This paper compares the digital operations of air interfaces of these standards w.r.t. modulation schemes and their spectral efficiency, physical and logical channels, mobile initialization procedures, authentication methods, power control mechanisms, handoff scenarios and capacity evaluations.
{"title":"An objective comparison of second generation cellular systems-GSM, IS-136 and IS-95","authors":"R. Paul, K. Shah","doi":"10.1109/ICPWC.1997.655572","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655572","url":null,"abstract":"With the advances made in the areas of digital communication, DSP and VLSI, mobile communication services at affordable rates have become a reality. With the shift to digital communications which provide better spectral utilization, several systems providing mobile cellular telecommunications have emerged. Three standards-GSM, IS-136 and IS-95-have come to be the contenders for mobile communication markets worldwide. This paper compares the digital operations of air interfaces of these standards w.r.t. modulation schemes and their spectral efficiency, physical and logical channels, mobile initialization procedures, authentication methods, power control mechanisms, handoff scenarios and capacity evaluations.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"14 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":"128492304","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.1997.655508
K. Abe, T. Hattori, A. Ishiwata, H. Koizumi
This paper first presents an outline of a new train radio communication system between trains and ground facilities, forming a multimedia railway information and communication system for train operation and passengers, that we have proposed for aiming high-speed and large-capacity communication such as multi-channel quasi-videos. This paper then studies antennas used for mobile radio station and radio base station. Also, this paper describes performance estimation of this proposed antennas, obtained by computer simulation. Results of estimation show that this proposed antenna system has a high degree of feasibility.
{"title":"A study on antennas for railway millimeter-wave radio communication system","authors":"K. Abe, T. Hattori, A. Ishiwata, H. Koizumi","doi":"10.1109/ICPWC.1997.655508","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655508","url":null,"abstract":"This paper first presents an outline of a new train radio communication system between trains and ground facilities, forming a multimedia railway information and communication system for train operation and passengers, that we have proposed for aiming high-speed and large-capacity communication such as multi-channel quasi-videos. This paper then studies antennas used for mobile radio station and radio base station. Also, this paper describes performance estimation of this proposed antennas, obtained by computer simulation. Results of estimation show that this proposed antenna system has a high degree of feasibility.","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":"130425613","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.1997.655543
T. Mineno, T. Babji
The objective of this article is to bring the benefits of NEC's experience to a number of telecom operators who are on the verge of either planning or implementing wireless local loop (WLL) based telephone access networks. Though the article provides details of NEC's experiences based on NEC's DCTS (digital cordless telephone system) WLL system, the topic described is relevant to any WLL based telephone access networks. This article presents and shares the experiences based on the actual field deployment of time bound WLL based telephone access network deployed by the NEC in various countries. Some of the WLL based networks were contracted by NEC on turnkey basis which provided greater insight into the implementation of WLL systems. A number of challenges and issues have been encountered by the NEC and their partners during the initial phase of implementation of the WLL networks.
{"title":"Issues and challenges of implementing a wireless local loop (WLL) based telephone access network","authors":"T. Mineno, T. Babji","doi":"10.1109/ICPWC.1997.655543","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655543","url":null,"abstract":"The objective of this article is to bring the benefits of NEC's experience to a number of telecom operators who are on the verge of either planning or implementing wireless local loop (WLL) based telephone access networks. Though the article provides details of NEC's experiences based on NEC's DCTS (digital cordless telephone system) WLL system, the topic described is relevant to any WLL based telephone access networks. This article presents and shares the experiences based on the actual field deployment of time bound WLL based telephone access network deployed by the NEC in various countries. Some of the WLL based networks were contracted by NEC on turnkey basis which provided greater insight into the implementation of WLL systems. A number of challenges and issues have been encountered by the NEC and their partners during the initial phase of implementation of the WLL networks.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"98 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":"131764771","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.1997.655501
P. Charriere, J. Brouet, V. Kumar
In a conventional organization of TDMA based cellular networks, the offered traffic is limited by both interference and radio resource management (RRM) issues. To overcome that limitation in very dense capacity areas (hot-spots), an original base station sub-system (BSS) organization with distributed coverage is proposed. In such a system, the base transceiver station (BTS) functionality is split between a central point, the BTS concentrator (BTSC) and several radiating elements (relays). For each communication, a set of relays connected to the same BTSC is assigned for both, synchronous broadcast of the same signal on the downlink, and demodulation of messages transmitted by the mobile station (MS) on the uplink. An optimization of the spectrum efficiency is achieved if one provides radio coverage only where needed, namely, in the vicinity of the MS. This however requires the addition of new RRM algorithm in the BSS as well as means to track the MS trajectory during its communication. This paper focuses on this last issue and several procedures performing best server-relay selection based on uplink signal measurements in an urban Manhattan-like environment are analyzed.
{"title":"Optimum channel selection strategies for mobility management in high traffic TDMA-based networks with distributed coverage","authors":"P. Charriere, J. Brouet, V. Kumar","doi":"10.1109/ICPWC.1997.655501","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655501","url":null,"abstract":"In a conventional organization of TDMA based cellular networks, the offered traffic is limited by both interference and radio resource management (RRM) issues. To overcome that limitation in very dense capacity areas (hot-spots), an original base station sub-system (BSS) organization with distributed coverage is proposed. In such a system, the base transceiver station (BTS) functionality is split between a central point, the BTS concentrator (BTSC) and several radiating elements (relays). For each communication, a set of relays connected to the same BTSC is assigned for both, synchronous broadcast of the same signal on the downlink, and demodulation of messages transmitted by the mobile station (MS) on the uplink. An optimization of the spectrum efficiency is achieved if one provides radio coverage only where needed, namely, in the vicinity of the MS. This however requires the addition of new RRM algorithm in the BSS as well as means to track the MS trajectory during its communication. This paper focuses on this last issue and several procedures performing best server-relay selection based on uplink signal measurements in an urban Manhattan-like environment are analyzed.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"20 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131839256","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.1997.655520
K. Kang, Jehoon Yoo, Yoonju Lee
In order to realize the IMT-2000 system, each functional entity in the IMT-2000 functional model should be mapped into a physical entity. We consider that an IMT-2000 network consists of a radio access system, ATM backbone, and an information handling system. We first discuss physical mapping scenarios for call and radio resource related functional entities. Then we present several possible mapping scenarios for the access network based on the IMT-2000 functional model and discuss the relative merits and disadvantages of all cases. The choice among these scenarios depends on a full consideration of various factors. After we select the most practical and feasible one, we present an IMT-2000 access network architecture restructured using the RACP (radio access control plane) and CCP (core control plane) concepts which conform to the basic IMT-2000 system model addressed by the ITU-R. Based on the architecture we propose, we believe that the IMT-2000 system can be realized with such advantages as cost savings, easy network maintenance and operations, and network evolution with the facility.
{"title":"A network architecture for IMT-2000 switching system","authors":"K. Kang, Jehoon Yoo, Yoonju Lee","doi":"10.1109/ICPWC.1997.655520","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655520","url":null,"abstract":"In order to realize the IMT-2000 system, each functional entity in the IMT-2000 functional model should be mapped into a physical entity. We consider that an IMT-2000 network consists of a radio access system, ATM backbone, and an information handling system. We first discuss physical mapping scenarios for call and radio resource related functional entities. Then we present several possible mapping scenarios for the access network based on the IMT-2000 functional model and discuss the relative merits and disadvantages of all cases. The choice among these scenarios depends on a full consideration of various factors. After we select the most practical and feasible one, we present an IMT-2000 access network architecture restructured using the RACP (radio access control plane) and CCP (core control plane) concepts which conform to the basic IMT-2000 system model addressed by the ITU-R. Based on the architecture we propose, we believe that the IMT-2000 system can be realized with such advantages as cost savings, easy network maintenance and operations, and network evolution with the facility.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"19 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":"133827410","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.1997.655512
S. Won, Whan-woo Kim, Y. Oh, I. Jeong
An analytic model for the algorithm controlling base station's received target signal-to-interference ratio (SIR) to maintain a pre-set frame error rate (FER) is derived. It is shown that the model can be used to find the optimum control step size for various wireless environments. The numerical results based on the analytic model are similar to the simulation results. As the probability of the assumed discrete speed change increases, the average target SIR increases but the optimum control step size decreases.
{"title":"An analytic approach for finding optimum parameter in controlling target SIR in a CDMA system","authors":"S. Won, Whan-woo Kim, Y. Oh, I. Jeong","doi":"10.1109/ICPWC.1997.655512","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655512","url":null,"abstract":"An analytic model for the algorithm controlling base station's received target signal-to-interference ratio (SIR) to maintain a pre-set frame error rate (FER) is derived. It is shown that the model can be used to find the optimum control step size for various wireless environments. The numerical results based on the analytic model are similar to the simulation results. As the probability of the assumed discrete speed change increases, the average target SIR increases but the optimum control step size decreases.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"10 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":"133942314","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.1997.655505
G.S. Hosangadi, C. Baum
Direct sequence spread spectrum (DS/SS) technology has been proven very useful in various mobile communication and global positioning systems. In order to exploit the advantages of a DS/SS signal the receiver must first be to able synchronize the local pseudonoise (PN) code with the received PN code. This is usually done in two steps: acquisition and tracking. First, the acquisition process coarsely aligns the two PN codes to within a fraction of a chip duration. The tracking circuit then takes over and performs fine adjustment until the desired accuracy is achieved. Hybrid acquisition schemes have been shown to provide a useful tradeoff between the low complexity of serial schemes and the high speed of parallel schemes. We compare two hybrid active schemes both using sequential tests at the testing stage. The first scheme uses a test based on the M-ary sequential probability ratio test (MSPRT), while the second scheme uses a test based on the sequential probability ratio test (SPRT) that utilizes M SPRTs operating independently. The latter scheme can be viewed as a form of pipelining. Both coherent and noncoherent acquisition are considered. The system and channel models are presented, and the sequential decision rules and numerical results are given.
{"title":"Pipelined sequential acquisition in a direct sequence spread spectrum communication system","authors":"G.S. Hosangadi, C. Baum","doi":"10.1109/ICPWC.1997.655505","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655505","url":null,"abstract":"Direct sequence spread spectrum (DS/SS) technology has been proven very useful in various mobile communication and global positioning systems. In order to exploit the advantages of a DS/SS signal the receiver must first be to able synchronize the local pseudonoise (PN) code with the received PN code. This is usually done in two steps: acquisition and tracking. First, the acquisition process coarsely aligns the two PN codes to within a fraction of a chip duration. The tracking circuit then takes over and performs fine adjustment until the desired accuracy is achieved. Hybrid acquisition schemes have been shown to provide a useful tradeoff between the low complexity of serial schemes and the high speed of parallel schemes. We compare two hybrid active schemes both using sequential tests at the testing stage. The first scheme uses a test based on the M-ary sequential probability ratio test (MSPRT), while the second scheme uses a test based on the sequential probability ratio test (SPRT) that utilizes M SPRTs operating independently. The latter scheme can be viewed as a form of pipelining. Both coherent and noncoherent acquisition are considered. The system and channel models are presented, and the sequential decision rules and numerical results are given.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"318 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":"134210907","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.1997.655537
N. Oda, H. Harada, I. Sasase, Y. Hase
This paper proposes an adaptive multi-code CDM transmission scheme for the multipath fading environment to achieve high code utilization efficiency. In the proposed system, we apply a new parallel transmission scheme using cyclic codes generated from a modified M-sequence which inserts the guard chips before and after an M-sequence. Moreover with radio channel estimation results obtained from the downlink by this multi-code CDM transmission scheme, the number of guard chips is varied adaptively on the uplink. In a micro cellular system, the performances of the proposed system are evaluated by computer simulation. As a result, it is essential for high quality broadband mobile communications to apply adaptive transmission to the new multi-code CDM transmission system.
{"title":"Performance analysis of a multi-code CDM transmission scheme based on cyclic extended spread code as a extension of 3rd generation CDMA system","authors":"N. Oda, H. Harada, I. Sasase, Y. Hase","doi":"10.1109/ICPWC.1997.655537","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655537","url":null,"abstract":"This paper proposes an adaptive multi-code CDM transmission scheme for the multipath fading environment to achieve high code utilization efficiency. In the proposed system, we apply a new parallel transmission scheme using cyclic codes generated from a modified M-sequence which inserts the guard chips before and after an M-sequence. Moreover with radio channel estimation results obtained from the downlink by this multi-code CDM transmission scheme, the number of guard chips is varied adaptively on the uplink. In a micro cellular system, the performances of the proposed system are evaluated by computer simulation. As a result, it is essential for high quality broadband mobile communications to apply adaptive transmission to the new multi-code CDM transmission system.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"78 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":"131427031","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.1997.655524
A. Doshi
In this paper, the key areas of focus include taking a strategic look at the growing usage of wireless, the application of wireless ATM (WATM) for multimedia, the Mobile IP and wireless data developments due to increased Internet navigation, application of PCS, and the deployment of wireless technology in the Asian region. The trends indicate that the increased flexibility and mobility features of wireless are motivating a large number of carriers to take a serious step towards the deployment of wireless networks. With downward economic trends for wireless devices and services, users are beginning to find it more affordable to consider wireless units. For the geographic and demographic conditions in the Asian region, the applicability of cordless infrastructures are gaining rapid momentum in a very short period. The paper clearly demonstrates that the current competition and developments in technology show that the user requirements will drive the developments in the wireless technology to get a "skyway to the future" over the next decade.
{"title":"Wireless technology-a skyway to the future","authors":"A. Doshi","doi":"10.1109/ICPWC.1997.655524","DOIUrl":"https://doi.org/10.1109/ICPWC.1997.655524","url":null,"abstract":"In this paper, the key areas of focus include taking a strategic look at the growing usage of wireless, the application of wireless ATM (WATM) for multimedia, the Mobile IP and wireless data developments due to increased Internet navigation, application of PCS, and the deployment of wireless technology in the Asian region. The trends indicate that the increased flexibility and mobility features of wireless are motivating a large number of carriers to take a serious step towards the deployment of wireless networks. With downward economic trends for wireless devices and services, users are beginning to find it more affordable to consider wireless units. For the geographic and demographic conditions in the Asian region, the applicability of cordless infrastructures are gaining rapid momentum in a very short period. The paper clearly demonstrates that the current competition and developments in technology show that the user requirements will drive the developments in the wireless technology to get a \"skyway to the future\" over the next decade.","PeriodicalId":166667,"journal":{"name":"1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338)","volume":"15 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":"114996579","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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