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

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Equalization for interference cancellation in spread spectrum multiple access systems 扩频多址系统中干扰消除的均衡
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245394
M. Abdulrahman, David Falconer, Asrar U. H. Sheikh
{"title":"Equalization for interference cancellation in spread spectrum multiple access systems","authors":"M. Abdulrahman, David Falconer, Asrar U. H. Sheikh","doi":"10.1109/VETEC.1992.245394","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245394","url":null,"abstract":"The performance of a fractionally spaced decision feedback equalizer (DFE) for spread-spectrum multiple access (SSMA) systems, which does not make explicit use of the interferers' spreading sequences, is evaluated. It is found that the system performance is acceptable even for small spreading gains in a slow-fading multipath environment. Good performance has been achieved without the knowledge of the desired user's spreading sequence. This could lead to less complex receivers and higher capacity of users for SSMA than that of other access techniques.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"9 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":"130890564","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: 70
Digital cellular modem field results 数字蜂窝调制解调器现场结果
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245459
H. L. Kazecki, J. C. Baker
{"title":"Digital cellular modem field results","authors":"H. L. Kazecki, J. C. Baker","doi":"10.1109/VETEC.1992.245459","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245459","url":null,"abstract":"Digital modem field test results applicable to the North American digital cellular system and the Japanese digital cellular system are presented. A modem meeting all specifications of the North American digital cellular system is described. The model is designed to identify channel conditions and to choose the appropriate detector operating with or without an equalizer. Measured bit error rate performance of the modem is presented in Rayleigh-faded and delay spread channels. Statistical data show the amount of time the modem required an equalizer detector during field testing. The speech quality outputs of the equalizer and nonequalizer detectors are compared. Diversity receiver performance in Rayleigh-faded and time-dispersive channels is reported.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"32 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":"130410593","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
Cell planning in Manhattan environments 曼哈顿环境下的细胞规划
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245360
M. Gudmundson
{"title":"Cell planning in Manhattan environments","authors":"M. Gudmundson","doi":"10.1109/VETEC.1992.245360","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245360","url":null,"abstract":"Using microcells is one way to meet the demand for high capacity in future mobile communication systems. In large cities, small cells can be achieved by placing base station antennas at approximately street level, using the surrounding buildings as propagation obstacles. Cell planning strategies for microcells are quite different from the cell planning strategies used for macrocells. However, as shown, the terrain structure allows a more efficient channel reuse. A simple model of a large city consisting of square blocks with streets in between (Manhattan model) is used. Efficient strategies for street microcells are suggested. Results show that for fixed planning in a microcellular system, a very small number of channel groups will suffice to achieve acceptable signal-to-interference ratios.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"18 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":"131689956","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: 64
Development of TDMA cellular base station equipment TDMA蜂窝基站设备的发展
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245331
S. Uebayashi, K. Ohno, T. Nojima
{"title":"Development of TDMA cellular base station equipment","authors":"S. Uebayashi, K. Ohno, T. Nojima","doi":"10.1109/VETEC.1992.245331","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245331","url":null,"abstract":"The system configuration and base station equipment developed to realize a three-channel TDMA cellular system based on the Japanese standard is described. The frequency band is 900 MHz and, the interleave carrier spacing is 25 kHz. The modulation scheme is pi /4-shift QPSK. Developed technologies include extremely low-distortion multicarrier power amplification, modulation/demodulation with diversity reception, and speech processing incorporating VOX control for reducing the power consumption of portable sets. These technologies increase the capacity remarkably, and reduce the size of the base station equipment to one-fifth that of existing analog systems. The cost is also reduced considerably. To ensure high-quality radio transmission performance, a BER of 10/sup -2/ is achieved at a median E/sub b//N/sub 0/ of less than 11 dB in fading environments. This ensures robust speech and nonspeech (facsimile/data) transmissions.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"17 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":"128805820","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
The impact of delay spread on multilevel FM systems in a Rayleigh fading, CCI and AWGN environment 瑞利衰落、CCI和AWGN环境下多电平调频系统延迟扩展的影响
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245340
G.K. Wu, K. Feher
{"title":"The impact of delay spread on multilevel FM systems in a Rayleigh fading, CCI and AWGN environment","authors":"G.K. Wu, K. Feher","doi":"10.1109/VETEC.1992.245340","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245340","url":null,"abstract":"An experimental study of the impact of delay spread on the performance of 4 PAM-FM mobile systems in a Rayleigh fading, cochannel interference (CCI) and additive white Gaussian noise (AWGN) environment is presented. The increase of the modulation index can improve the BER if the reflected signal power is 10 dB less than the direct signal in the two-ray fading model. A strategy which reduces the impact of delay spread even in the worst case situation is proposed. By increasing the roll-off factor of the lowpass filters and by lowering the modulation index, for a BER of 0.01, the delay spread immunity is increased 300% without the need for adaptive equalization. In the delay spread environment, CCI is not significant if it is less than -20 dB. AWGN interference is noticeable only when it is higher than -13 dB.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"25 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":"123299454","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
Performance evaluation of a DECT based wireless PABX 基于DECT的无线PABX性能评价
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245298
D. Musoni, S. Riguzzi, G. Rosina
{"title":"Performance evaluation of a DECT based wireless PABX","authors":"D. Musoni, S. Riguzzi, G. Rosina","doi":"10.1109/VETEC.1992.245298","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245298","url":null,"abstract":"The DECT standard developed to meet the increasing demand for cordless communications faces the necessity to be flexible enough to hold high traffic in small ranges. To avoid frequency planning in such limited areas as offices or airport halls, a radio feature has been developed: dynamic channel selection (DCS). This feature has been investigated to see its effect on capacity in high traffic indoor environment, in the most typical operating conditions.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"59 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":"123398147","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: 12
Measurement system for indoor narrowband radio propagation at 1700 MHz and some results 1700兆赫室内窄带无线电传播测量系统及一些结果
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245318
P. Karlsson, H. Borjeson
{"title":"Measurement system for indoor narrowband radio propagation at 1700 MHz and some results","authors":"P. Karlsson, H. Borjeson","doi":"10.1109/VETEC.1992.245318","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245318","url":null,"abstract":"A system for narrowband propagation measurements at 1700 MHz comprising a portable transmitter and two stationary receivers is presented. With this set-up, simulcast is used, and the receivers sample the same carrier frequency. The measured field-strength values are recorded in a laptop-type PC, together with information from the transmitter including sample number and location. The system allows investigation of propagation losses, shadowing due to body effects and different diversity schemes since the recorded values can be identified and compared owing to the transmitted information. The first results show how the fading statistics change when the person carrying the portable transmitter disturbs the radio path.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"11 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":"122576320","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: 4
Performance analysis of an improved dynamic channel allocation scheme for cellular mobile radio systems 一种改进的蜂窝移动无线电动态信道分配方案的性能分析
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245305
G. Riva
{"title":"Performance analysis of an improved dynamic channel allocation scheme for cellular mobile radio systems","authors":"G. Riva","doi":"10.1109/VETEC.1992.245305","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245305","url":null,"abstract":"The introduction of dynamic channel allocation (DCA) schemes in future microcellular systems needs proper evaluation of their stability behavior. Some parameters are suggested for simplified analysis, and some comments, derived from software simulations in very simple situations, are made. A more realistic and general simulation showed the improvements, in terms of quality parameters and capacity, obtained with the proposed DCA algorithm. This should not be considered an optimal system, but just an indication of a good direction.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"109 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":"122244719","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: 8
Simulated performance of an indoor digital radio system employing adaptive antenna combining in the presence of single and multiple interferers 采用自适应天线组合的室内数字无线电系统在单干扰和多干扰情况下的仿真性能
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245297
S. Hanna, M. El-Tanay, S. Mahmoud
{"title":"Simulated performance of an indoor digital radio system employing adaptive antenna combining in the presence of single and multiple interferers","authors":"S. Hanna, M. El-Tanay, S. Mahmoud","doi":"10.1109/VETEC.1992.245297","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245297","url":null,"abstract":"The impact of the number of cochannel interferers on the simulated performance of an adaptive antenna combiner is studied. Current simulation are conducted for time division multiple access (TDMA) narrowband transmission over Rayleigh fading channels with coherent QPSK signaling at 1.7 GHz. System performance in terms of bit error rate (BER) curves is presented for 1,2,3, and 8 equal-power cochannel interferers and compared to BER curves of no interference and no diversity. The effects of the average signal-to-interference ratio on the number of bit errors per block are presented.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"65 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":"121083099","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: 0
Optimum dynamic channel allocation in certain street microcellular radio systems 某街道微蜂窝无线电系统的最优动态信道分配
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245486
M. Frodigh
{"title":"Optimum dynamic channel allocation in certain street microcellular radio systems","authors":"M. Frodigh","doi":"10.1109/VETEC.1992.245486","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245486","url":null,"abstract":"In existing macrocellular systems, microcells may be used to increase the capacity in areas with large traffic demands. Examples of such areas are roads and streets where the microcells will form one-dimensional structures. Using smaller cells implies that the variations in telephone traffic load will increase. To adapt to these variations, a simple dynamic channel allocation algorithm for one-dimensional cellular systems is proposed. The algorithm is shown to maximize the number of assigned calls and lends itself to distributed implementation.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"7 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":"115223493","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: 16
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