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[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology最新文献

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Propagation measurements in an indoor radio environment at 2.4 GHz, 4.75 GHz and 11.5 GHz 2.4 GHz、4.75 GHz和11.5 GHz室内无线电环境下的传播测量
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245320
Gerard J. M. Janssen, Ramjee Prasad
{"title":"Propagation measurements in an indoor radio environment at 2.4 GHz, 4.75 GHz and 11.5 GHz","authors":"Gerard J. M. Janssen, Ramjee Prasad","doi":"10.1109/VETEC.1992.245320","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245320","url":null,"abstract":"Propagation measurements were performed in an indoor radio environment at 2.4 GHz, 4.75 GHz, and 11.5 GHz using a coherent measurement system consisting of an HP synthesized sweeper and a network analyzer. The three frequencies are compared by evaluating the RMS time delay spread and path loss characteristics. Such frequency comparisons in an indoor radio environment are reported.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133949444","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}
引用次数: 77
Bit error rate performance of a direct-sequence spread-spectrum multiple-access cellular system in urban multipath mobile radio environments 城市多径移动无线电环境下直接序列扩频多址蜂窝系统的误码率性能
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245397
A. Fapojuwo, A. Shen
{"title":"Bit error rate performance of a direct-sequence spread-spectrum multiple-access cellular system in urban multipath mobile radio environments","authors":"A. Fapojuwo, A. Shen","doi":"10.1109/VETEC.1992.245397","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245397","url":null,"abstract":"The results of a comprehensive study of the bit error rate performance of a direct-sequence spread-spectrum multiple-access (DS-SSMA) cellular system with differential phase shift keying modulation in realistic urban and suburban multipath mobile radio propagation channels are presented. Sample simulation results show that multipath combining is more effective in an urban than in a suburban environment. The results show that the bit error rate can be reduced by up to an order of magnitude if a multipath combining receiver is used instead of a single-path receiver.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128918506","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}
引用次数: 1
Time-slot transfer in TDMA portable radio systems 时分多址便携式无线电系统中的时隙传输
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245334
R. C. Bernhardt, Bellcore
{"title":"Time-slot transfer in TDMA portable radio systems","authors":"R. C. Bernhardt, Bellcore","doi":"10.1109/VETEC.1992.245334","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245334","url":null,"abstract":"Measurement-based methods for the reassignment of a call to a time-slot with less cochannel interference on a time-division multiple access (TDMA) radio link are described and evaluated using discrete-event simulation. Portable radio access, transfer triggering, and time-slot selection are simulated using an integrated radio and traffic model. It was found that link quality can be maintained with a low transfer rate, even under heavy traffic load. Performance was robust with respect to trigger measurement error. Hysteresis reduced the transfer rate without noticeably affecting quality.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134613513","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}
引用次数: 1
A multilevel differential modem for narrowband fading channels 用于窄带衰落信道的多电平差分调制解调器
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245461
R. Castle, Joe McGeehan
{"title":"A multilevel differential modem for narrowband fading channels","authors":"R. Castle, Joe McGeehan","doi":"10.1109/VETEC.1992.245461","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245461","url":null,"abstract":"The authors analyze the design and performance of a differential receiver, including simulated results for operation in an existing PMR scenario in the UK. Practical considerations for the construction of such a modem are also included.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"62 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131879448","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}
引用次数: 17
Performance analysis of a CDMA cellular system CDMA蜂窝系统的性能分析
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245401
Q. Bi
{"title":"Performance analysis of a CDMA cellular system","authors":"Q. Bi","doi":"10.1109/VETEC.1992.245401","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245401","url":null,"abstract":"When operated in the asynchronous mode, code-division multiple access (CDMA) allows the remote users to transmit at any arbitrary time instant, therefore simplifying the design of the remote terminals. The cost of this flexibility is paid by the tolerance of the interferences from other users in the same cell. A CDMA cellular system that utilizes the M-ary signaling technique to reduce the effects of the interferences is presented. The performance of this system is investigated in terms of the bit error rate achievable by the system.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121947191","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}
引用次数: 30
Group 3 facsimile transmission over digital satellite land mobile networks 通过数字卫星陆地移动网络进行的第3组传真传输
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245431
S. Dimolitsas, J. Rieser, R. Ragland, E. Davis
{"title":"Group 3 facsimile transmission over digital satellite land mobile networks","authors":"S. Dimolitsas, J. Rieser, R. Ragland, E. Davis","doi":"10.1109/VETEC.1992.245431","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245431","url":null,"abstract":"The main characteristics of a real-time bandwidth reduction approach are described whereby facsimile signals are demodulated and their associated protocols are converted by a facsimile interface unit (FIU) to a format suitable for transmission over Inmarsat-M digital satellite channels. The Inmarsat-M system is designed to serve land mobile customers, however, it is also readily used for maritime communications. The FIU concept was developed to allow off-the-shelf facsimile terminals to be interconnected via the PSTN through Inmarsat's satellite networks and to permit the provision of enhanced user services by converting Group 3 facsimile protocols to broadcast operation. In addition, the FIU concept is designed to compensate for the longer access and transport link delays encountered in mobile satellite systems, and to permit facsimile call recovery procedures to be successfully concatenated with satellite channel error detection and recovery mechanisms.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124767319","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}
引用次数: 3
TDMA and CDMA in a fiber-optic environment 光纤环境中的时分多址和码分多址
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245472
V. O'Byrne
{"title":"TDMA and CDMA in a fiber-optic environment","authors":"V. O'Byrne","doi":"10.1109/VETEC.1992.245472","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245472","url":null,"abstract":"Some of the technical issues and scenarios involved in using digital cellular over the cable television (CATV) network are addressed, and it is shown that direct-sequence code-division multiple access (DS-CDMA) requires relatively inexpensive lasers, costing less than one quarter the price of those required for time-division multiple access (TDMA) and the present analog cellular systems. It also requires less system engineering when used over the CATV fiber-optic plant, thus reducing the overall system complexity.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129569781","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}
引用次数: 6
An investigation of RAKE receiver operation in an urban environment for various spreading bandwidth allocations 城市环境下不同扩频带宽分配的RAKE接收机运行研究
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245345
S. Allpress, Mark A. Beach, G. Martin, C. M. Simmonds
{"title":"An investigation of RAKE receiver operation in an urban environment for various spreading bandwidth allocations","authors":"S. Allpress, Mark A. Beach, G. Martin, C. M. Simmonds","doi":"10.1109/VETEC.1992.245345","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245345","url":null,"abstract":"The renewed interest in the application of the spread-spectrum techniques such as CDMA to cellular mobile radio systems, in both the US, and within Europe through the RACE II and UK DTI/SERC LINK programs continues to gather momentum. To this end, an analytical performance model has been developed in order to provide a greater insight into the operation of this technique, in particular the sensitivity of the bandwidth efficiency of the network to the form of diversity signal processing used in the mobile transceiver. This theme is continued with an investigation of the wideband channel characteristics of an urban service area. Results are presented relating the statistics of the RAKE receiver branches to the spreading bandwidth used.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129025889","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}
引用次数: 15
Binary and multilevel offset QAM, spectrum efficient modulation schemes for personal communications 二进制和多电平偏移QAM，个人通信的频谱高效调制方案
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245386
E. Malkamaki
{"title":"Binary and multilevel offset QAM, spectrum efficient modulation schemes for personal communications","authors":"E. Malkamaki","doi":"10.1109/VETEC.1992.245386","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245386","url":null,"abstract":"In personal communications, especially in small cells, high capacity is needed. The modulation scheme utilized must be spectrally efficient. The performance of linear binary and quaternary offset QAM schemes is simulated in indoor cellular environment. The performance and the spectrum efficiency is compared with GMSK, a constant envelope modulation scheme. Binary offset QAM is shown to be 10-35% more spectrum efficient. A comparison is made with conventional 4 QAM. Binary offset QAM is shown to be more robust against power amplifier nonlinearities. The spectrum efficiencies of binary and quaternary offset QAM schemes are compared. Offset QAM schemes are shown to be good candidates for the third-generation mobile radio system.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132429538","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}
引用次数: 15
BER performance of CMA adaptive array for a GMSK/TDMA system-a description of measurements in central Tokyo GMSK/TDMA系统CMA自适应阵列的误码率性能——东京中心测量描述
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245255
T. Ohgane, H. Sasaoka, N. Matsuzawa, T. Shimura
{"title":"BER performance of CMA adaptive array for a GMSK/TDMA system-a description of measurements in central Tokyo","authors":"T. Ohgane, H. Sasaoka, N. Matsuzawa, T. Shimura","doi":"10.1109/VETEC.1992.245255","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245255","url":null,"abstract":"The bit-error-rate (BER) performance of a constant modulus algorithm adaptive array for a Gaussian-filtered minimum shift keying/time division multiple access (GMSK/TDMA) system is described. The measurement was carried out in central and suburban Tokyo. The system uses a modulation data rate of 256 kb/s. In order to reduce the effect of multipath fading, an adaptive array of four antenna elements is implemented using a digital beam forming concept. The improvement in input power, compared with that of a single antenna system, reaches 16 dB in suburban Tokyo and 19 to 23 dB in central Tokyo at a BER of 1.0*10/sup -2/. Moreover, in central Tokyo, the irreducible error seen in the single antenna system is removed by the adaptive array.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132265283","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}
引用次数: 1
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