Pub Date : 1990-05-06DOI: 10.1109/VETEC.1990.110344
G. Mony, B. Toplis, J. Michaelides
The structure and performance of a circuit-switched data transport mechanism that transmits up to 9.6 kb/s asynchronous data over a North American time-division multiple access (TDMA) digital cellular radio channel are described. Options for the radio data link layer protocol are examined. The ARQ protocols examined are derived from the high-level data link control (HDLC) family. The options considered are type-one hybrid ARQ (automatic repeat request) schemes using a HDLC data link layer and Reed-Solomon forward error correction. Asynchronous throughput results obtained using a Rayleigh fading model are presented for different speeds and carrier-to-interference ratios. Simulations indicate that at least 4.8 kb/s throughput is achievable for a 17 dB carrier-to-interference ratio, and performance rapidly approaches the maximum rate of 9.6 kb/s for less interference.<>
{"title":"Performance assessment of data transport alternatives for digital cellular radio","authors":"G. Mony, B. Toplis, J. Michaelides","doi":"10.1109/VETEC.1990.110344","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110344","url":null,"abstract":"The structure and performance of a circuit-switched data transport mechanism that transmits up to 9.6 kb/s asynchronous data over a North American time-division multiple access (TDMA) digital cellular radio channel are described. Options for the radio data link layer protocol are examined. The ARQ protocols examined are derived from the high-level data link control (HDLC) family. The options considered are type-one hybrid ARQ (automatic repeat request) schemes using a HDLC data link layer and Reed-Solomon forward error correction. Asynchronous throughput results obtained using a Rayleigh fading model are presented for different speeds and carrier-to-interference ratios. Simulations indicate that at least 4.8 kb/s throughput is achievable for a 17 dB carrier-to-interference ratio, and performance rapidly approaches the maximum rate of 9.6 kb/s for less interference.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126511145","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110355
T. Takeuchi, M. Sako, S. Yoshida
Multipath delay profile measurements were conducted in a meeting room, an office, and a laboratory at 1.5 GHz with 50 ns time resolution to clarify the feasibility of a high-speed digital wireless communication system in an open-structure office room. Continuous power delay profile measurement revealed large variation of power delay profile in the same room. Measured RMS delay spread and mean excess delay were found to be dependent on the size of the room. Multi-reflection on walls was observed when received by a directional antenna. From these results, a simple propagation model for an indoor radio environment is proposed consisting of multi-wall-reflection waves with free space loss and wall-reflection loss, which describes the spatial variation of RMS delay spread.<>
{"title":"Multipath delay estimation for indoor wireless communication","authors":"T. Takeuchi, M. Sako, S. Yoshida","doi":"10.1109/VETEC.1990.110355","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110355","url":null,"abstract":"Multipath delay profile measurements were conducted in a meeting room, an office, and a laboratory at 1.5 GHz with 50 ns time resolution to clarify the feasibility of a high-speed digital wireless communication system in an open-structure office room. Continuous power delay profile measurement revealed large variation of power delay profile in the same room. Measured RMS delay spread and mean excess delay were found to be dependent on the size of the room. Multi-reflection on walls was observed when received by a directional antenna. From these results, a simple propagation model for an indoor radio environment is proposed consisting of multi-wall-reflection waves with free space loss and wall-reflection loss, which describes the spatial variation of RMS delay spread.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125208479","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110310
Kenji Imamura, K. Watanabe, K. Nagata
The problems involved in the introduction of MCS-12, NTT's second-generation cellular system, are described. These problems primarily lie in achieving the optimum balance between equipment cost and cell size. Existing design models are suitable for single cellular systems. It was proposed that the subscriber capacity model and the system cost model for single cellular systems can be applied to overlaid systems. Using the models, the optimum balance between cell radius and equipment cost can be determined for an overlaid system, so as to achieve the cheapest cost for each subscriber. If cellular systems are to be overlaid, the question of system compatibility cannot be avoided. The effects of the various compatibility schemes are discussed. A case study details the compatibility of NTT's MCS-L2 with the original MCS-L1 analog system.<>
{"title":"A study on system compatibility of land mobile communications systems","authors":"Kenji Imamura, K. Watanabe, K. Nagata","doi":"10.1109/VETEC.1990.110310","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110310","url":null,"abstract":"The problems involved in the introduction of MCS-12, NTT's second-generation cellular system, are described. These problems primarily lie in achieving the optimum balance between equipment cost and cell size. Existing design models are suitable for single cellular systems. It was proposed that the subscriber capacity model and the system cost model for single cellular systems can be applied to overlaid systems. Using the models, the optimum balance between cell radius and equipment cost can be determined for an overlaid system, so as to achieve the cheapest cost for each subscriber. If cellular systems are to be overlaid, the question of system compatibility cannot be avoided. The effects of the various compatibility schemes are discussed. A case study details the compatibility of NTT's MCS-L2 with the original MCS-L1 analog system.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133738449","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110336
N. Nakajima, M. Kuramoto, K. Kinoshita, T. Utano
The design parameters and experimental results for a proposed time-division multiple access (TDMA) digital mobile system are shown. The related network architecture, frame structure, and signaling structure for a digital system are given. The proposed system structure has three-slot TDMA, pi /4 shifted QPSK (quadrature phase shift keying), and 25 kHz carrier spacing. A spectrum-efficient system can be realized by using radio transmission techniques, such as diversity, bidirectional feed control amplifier, and robust CODECs. Field experiments have verified the digital transmission performance of this system. A signaling structure featuring service flexibility, such as ISDN service, is presented.<>
{"title":"A system design for TDMA mobile radios","authors":"N. Nakajima, M. Kuramoto, K. Kinoshita, T. Utano","doi":"10.1109/VETEC.1990.110336","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110336","url":null,"abstract":"The design parameters and experimental results for a proposed time-division multiple access (TDMA) digital mobile system are shown. The related network architecture, frame structure, and signaling structure for a digital system are given. The proposed system structure has three-slot TDMA, pi /4 shifted QPSK (quadrature phase shift keying), and 25 kHz carrier spacing. A spectrum-efficient system can be realized by using radio transmission techniques, such as diversity, bidirectional feed control amplifier, and robust CODECs. Field experiments have verified the digital transmission performance of this system. A signaling structure featuring service flexibility, such as ISDN service, is presented.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131925954","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110331
W.R. Mande
In the future pan-European cellular mobile telephone system of the 'Groupe Speciale Mobile (GSM)' of CEPT, the decision whether a handover shall happen can be based on a set of variables whose values are measured in the system. Some performance measures for handover algorithms are reported, and a simulation tool for the evaluation of a proposed GSM handover algorithm is described. Some results of the evaluation are included. Special attention is given to the time over which the sampled values are averaged. The evaluation is based on a model of a cellular network, where the radio propagation characteristics are assumed to follow a lognormal law with Rayleigh fading. For given routes of mobiles, measurements of the received signal level are obtained by simulation and fed to the handover algorithm.<>
{"title":"Evaluation of a proposed handover algorithm for the GSM cellular system","authors":"W.R. Mande","doi":"10.1109/VETEC.1990.110331","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110331","url":null,"abstract":"In the future pan-European cellular mobile telephone system of the 'Groupe Speciale Mobile (GSM)' of CEPT, the decision whether a handover shall happen can be based on a set of variables whose values are measured in the system. Some performance measures for handover algorithms are reported, and a simulation tool for the evaluation of a proposed GSM handover algorithm is described. Some results of the evaluation are included. Special attention is given to the time over which the sampled values are averaged. The evaluation is based on a model of a cellular network, where the radio propagation characteristics are assumed to follow a lognormal law with Rayleigh fading. For given routes of mobiles, measurements of the received signal level are obtained by simulation and fed to the handover algorithm.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"7 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114031552","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110362
P. Mogensen, B.L. Andersen, B. Madsen, J. Andersen
Measurements of complex impulse responses and transmission of pan-European mobile telephone system GSM timeslots have been carried out in different environments. The short-term variations of the mobile channel have been simulated on computer for comparison. Power, time and phase gradients put demands on the receiver. The variations of these parameters are discussed in theoretical, numerical, and experimental terms. The experimentally obtained values of power gradients are on the order 10 dB between two frames at the 1% level, while the variation from one timeslot to the next is on the order 3 dB at normal speeds of about 50 km/h. Theoretically obtained values show considerably higher variations. The distributions of time-jitter as a function of different environments are also given.<>
{"title":"Short-term variations of the mobile channel and the GSM signal","authors":"P. Mogensen, B.L. Andersen, B. Madsen, J. Andersen","doi":"10.1109/VETEC.1990.110362","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110362","url":null,"abstract":"Measurements of complex impulse responses and transmission of pan-European mobile telephone system GSM timeslots have been carried out in different environments. The short-term variations of the mobile channel have been simulated on computer for comparison. Power, time and phase gradients put demands on the receiver. The variations of these parameters are discussed in theoretical, numerical, and experimental terms. The experimentally obtained values of power gradients are on the order 10 dB between two frames at the 1% level, while the variation from one timeslot to the next is on the order 3 dB at normal speeds of about 50 km/h. Theoretically obtained values show considerably higher variations. The distributions of time-jitter as a function of different environments are also given.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116260081","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110365
S. Sampei, T. Sunaga
A novel type of space diversity with maximal ratio combining for multilevel quadrature amplitude modulation (QAM) in land mobile communications to improve transmission performance is proposed. In order to realize maximal ratio combining space diversity for QAM, a novel type of diversity combining method using a pilot symbol insertion type fading estimator is applied. The proposed diversity combining is carried out at the baseband using digital signal processing, simplifying the diversity receiver hardware. Computer simulation and laboratory experiments confirm that the multilevel QAM using the proposed method is effective for improving the transmission performance of land mobile communications.<>
{"title":"Performance of multi-level QAM with maximal ratio combining space diversity for land mobile radio communications","authors":"S. Sampei, T. Sunaga","doi":"10.1109/VETEC.1990.110365","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110365","url":null,"abstract":"A novel type of space diversity with maximal ratio combining for multilevel quadrature amplitude modulation (QAM) in land mobile communications to improve transmission performance is proposed. In order to realize maximal ratio combining space diversity for QAM, a novel type of diversity combining method using a pilot symbol insertion type fading estimator is applied. The proposed diversity combining is carried out at the baseband using digital signal processing, simplifying the diversity receiver hardware. Computer simulation and laboratory experiments confirm that the multilevel QAM using the proposed method is effective for improving the transmission performance of land mobile communications.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124691765","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110287
J. Rasinger, A. Scholtz, W. Pichler, E. Bonek
A novel internal antenna for hand-held mobile communications is presented. Topics covered include antenna bandwidth, description of the radiation-coupled dual-L antenna, the CAD system for wire-grid modeling, bandwidth, impedance, the shielding case, and the radiation pattern. This radiation-coupled dual-L antenna radiates isotropically, and offers a number of design options for impedance matching. Compared with an inverted-F antenna of equal height, its bandwidth is higher by at least 50%. Numerically calculated results based on a wire-grid model of this antenna agree well with measurement of bandwidth, input impedance, and radiation patterns. A major advantage of this antenna is its enhanced bandwidth without external matching networks in a small occupied volume.<>
{"title":"A new enhanced-bandwidth internal antenna for portable communication systems","authors":"J. Rasinger, A. Scholtz, W. Pichler, E. Bonek","doi":"10.1109/VETEC.1990.110287","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110287","url":null,"abstract":"A novel internal antenna for hand-held mobile communications is presented. Topics covered include antenna bandwidth, description of the radiation-coupled dual-L antenna, the CAD system for wire-grid modeling, bandwidth, impedance, the shielding case, and the radiation pattern. This radiation-coupled dual-L antenna radiates isotropically, and offers a number of design options for impedance matching. Compared with an inverted-F antenna of equal height, its bandwidth is higher by at least 50%. Numerically calculated results based on a wire-grid model of this antenna agree well with measurement of bandwidth, input impedance, and radiation patterns. A major advantage of this antenna is its enhanced bandwidth without external matching networks in a small occupied volume.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125187617","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110329
G. Atkin, R.A. Khalona
Signal sets are considered which give rise to multitone M-ary frequency shift keying (MT-MFSK) modulation, which represents a bandwidth efficient alternative to optimum performance modulation schemes for the AWGN channel (simplex signaling for coherent detection and orthogonal signaling for noncoherent detection). The channel is examined in the power-limited region, and it is shown that MT-MFSK modulation exhibits optimum asymptotic performance with bandwidth efficiency gains of an order of magnitude over the orthogonal MFSK modulation technique for sets of finite size. MT-MFSK is viewed as a class of signal sets derived from combinatorial designs. The main properties and structure of such sets are presented and exploited to derive tight upper bounds for the error probability.<>
{"title":"Bandwidth efficient signal sets with partitioned equicorrelated properties for the AWGN channel","authors":"G. Atkin, R.A. Khalona","doi":"10.1109/VETEC.1990.110329","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110329","url":null,"abstract":"Signal sets are considered which give rise to multitone M-ary frequency shift keying (MT-MFSK) modulation, which represents a bandwidth efficient alternative to optimum performance modulation schemes for the AWGN channel (simplex signaling for coherent detection and orthogonal signaling for noncoherent detection). The channel is examined in the power-limited region, and it is shown that MT-MFSK modulation exhibits optimum asymptotic performance with bandwidth efficiency gains of an order of magnitude over the orthogonal MFSK modulation technique for sets of finite size. MT-MFSK is viewed as a class of signal sets derived from combinatorial designs. The main properties and structure of such sets are presented and exploited to derive tight upper bounds for the error probability.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125569939","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 : 1990-05-06DOI: 10.1109/VETEC.1990.110296
T. Komazaki, K. Gunji
The mobile terminal duplexer consists primarily of transmitting/receiving filters and a branching circuit. The filter consists primarily of a semicoaxial resonator, which is made of material of a high dielectric constant for compact components. A dielectric filter with attenuation pole and a novel branching circuit which have been developed by OKI for compactness and higher performance are introduced. The attenuation pole is implemented by connecting an additional circuit based on a capacitive-coupled bandpass filter. Three circuits are discussed: a circuit comprised of three-resonators with an attenuation pole on each of the lower and higher frequency sides of the passband, exhibiting symmetrical characteristics; a circuit with an attenuation pole only on the higher frequency side of the passband; and a circuit with an attenuation pole only on the lower frequency side of the passband. The filter features compactness (25% smaller, as compared with older models), and small insertion loss.<>
{"title":"Attenuation pole type dielectric filter for duplexer","authors":"T. Komazaki, K. Gunji","doi":"10.1109/VETEC.1990.110296","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110296","url":null,"abstract":"The mobile terminal duplexer consists primarily of transmitting/receiving filters and a branching circuit. The filter consists primarily of a semicoaxial resonator, which is made of material of a high dielectric constant for compact components. A dielectric filter with attenuation pole and a novel branching circuit which have been developed by OKI for compactness and higher performance are introduced. The attenuation pole is implemented by connecting an additional circuit based on a capacitive-coupled bandpass filter. Three circuits are discussed: a circuit comprised of three-resonators with an attenuation pole on each of the lower and higher frequency sides of the passband, exhibiting symmetrical characteristics; a circuit with an attenuation pole only on the higher frequency side of the passband; and a circuit with an attenuation pole only on the lower frequency side of the passband. The filter features compactness (25% smaller, as compared with older models), and small insertion loss.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126161950","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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