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A new generation of high-power cellular repeaters 新一代高功率蜂窝中继器
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110290
R. J. Jakubowski
{"title":"A new generation of high-power cellular repeaters","authors":"R. J. Jakubowski","doi":"10.1109/VETEC.1990.110290","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110290","url":null,"abstract":"The design concepts and applications of an EIA type-IV cellular repeater being offered by the Antenna Specialists Company are described. As large metropolitan systems mature, customers expect coverage further and further out into the suburbs. Rural systems under development, on the other hand, may project only enough subscribers to justify a single cell site. Both of these systems would benefit from a booster that would significantly extend coverage, but cost only a fraction of the amount of a conventional cell site. The Extend-A-Cell IV high power repeater system has been designed with these applications in mind. The high-power, frequency-translating cellular repeater is designed to significantly extend the coverage range of a cell site. This repeater is frequency-agile and translating, completely remote controlled, and unlike earlier boosters that required donor-cell sectorization requires no system modifications.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"64 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":"126389432","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: 2
Local mean signal variability in rural areas at 900 MHz 900兆赫时农村地区的本地平均信号变异性
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110392
S. Mockford, A. Turkmani, J. D. Parsons
{"title":"Local mean signal variability in rural areas at 900 MHz","authors":"S. Mockford, A. Turkmani, J. D. Parsons","doi":"10.1109/VETEC.1990.110392","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110392","url":null,"abstract":"Analysis of mobile radio propagation results from surveys made in rural areas of England have shown that over different distances, the local mean of the signal envelope is well described by a lognormal distribution. This analysis has provided a knowledge of the standard deviation of the lognormal distribution, sigma /sub L/, as a function of the size of area under consideration. It has also shown categorically that sigma /sub L/ is independent of path length. Large amounts of data were collected along several survey routes, so that the parameters of a local mean fading simulator could be determined. The power spectral density of the local mean signal measured along rural routes is estimated. The relative spectral density of the local mean signal variations is found to be always less than -10 dB for frequencies greater than f/sub D//360.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"s3-50 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":"130238653","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: 35
Variable packet ALOHA networks 可变分组ALOHA网络
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110348
J. Mccartin, T. Ha
{"title":"Variable packet ALOHA networks","authors":"J. Mccartin, T. Ha","doi":"10.1109/VETEC.1990.110348","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110348","url":null,"abstract":"An analysis of the throughput for two variable-packet ALOHA network models is presented. Variable-packet ALOHA does not require (1) padded bits to fill up a packet to its specified length (which may significantly reduce the throughput of fixed-packet ALOHA), or (2) bit stuffing and destuffing logics (which increase equipment cost in fixed-packet ALOHA). The first model uses random two power levels to induce receiver capture. The second model considers the near/far effect between users and the base station in a local or mobile radio networkl. Analytical results that indicate a significant increase in throughput for both models are presented.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"33 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":"124988726","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
Backoff improvement of an 800-MHz GaAs FET amplifier for a QPSK transmitter using an adaptive nonlinear distortion canceller 采用自适应非线性失真消除器改进QPSK发射机800-MHz GaAs FET放大器的退退
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110381
M. Minowa, M. Onoda, E. Fukuda, Y. Daido
{"title":"Backoff improvement of an 800-MHz GaAs FET amplifier for a QPSK transmitter using an adaptive nonlinear distortion canceller","authors":"M. Minowa, M. Onoda, E. Fukuda, Y. Daido","doi":"10.1109/VETEC.1990.110381","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110381","url":null,"abstract":"The use of a nonlinear distortion canceller (NLDC) with a Cartesian feedback loop to improve the output backoff of an 800 MHz GaAs FET power amplifier when a quadrature phase shift keying (QPSK) signal with a rolloff factor of 0.5 is applied is described. This amplifier module uses three GaAs FETs. The amplifier's saturated power is 31 dBm, and its maximum power-added efficiency is 50%. Excellent operation of the NLDC was confirmed within a backoff range of more than 4 dB. Within this range, the out-of-band emission was kept 55 dB below the center frequency level. Since the peak output power coincides with the saturation power at a 4 dB backoff, the NLDC improves the backoff to the theoretical limit.<<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":"131483163","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: 22
Data compression of voiceband modem signals 话音带调制解调器信号的数据压缩
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110341
D. Lin, S. D. Kurtz, B. McCarthy
{"title":"Data compression of voiceband modem signals","authors":"D. Lin, S. D. Kurtz, B. McCarthy","doi":"10.1109/VETEC.1990.110341","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110341","url":null,"abstract":"The development of an integrated data-compression system for speech and voiceband modem signals is described. The integrated source coder performs a quadrature decomposition of a bauded signal prior to quantization. A detection algorithm is used to determine the presence and the carrier frequency of the bauded signal. The coder is currently implemented with a TMS 32020 digital signal processor in a basic exchange radio system to provide wireless digital access for rural subscribers. Performance of the integrated source coder was evaluated in the lab and in a field trial. Using a radio link in the lab, the coder support the following data communication standards: 300 b/s Bell 103, CCITT V.21; 1200 b/s Bell 212A, CCITT V.22; 2400 b/s CCITT V.22 bis; and 2400 b/s CCITT V.24 ter. Tests were also conducted for the transmission of facsimiles between a dozen of the popular low-priced telecopiers. The reproduction quality of the system for various types of documents and drawings were near transparent.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"11 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":"126551385","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
Design features of a premises cordless telephone system 室内无绳电话系统的设计特点
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110317
M. Kawano, T. Iwahashi, K. Mitsui, Y. Ozu
{"title":"Design features of a premises cordless telephone system","authors":"M. Kawano, T. Iwahashi, K. Mitsui, Y. Ozu","doi":"10.1109/VETEC.1990.110317","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110317","url":null,"abstract":"The premises cordless telephone (PCT) system provides a full function access to PSTN (public switched telephone network) subscriber lines via an existing PBX (private branch exchange) and/or a single controller or a network of controllers. The system enhances corporate communications by giving callers direct dial-through access to executives on the move and engineers and technicians working out of reach of wired telephones. The system offers similar benefits for offices, hotels, hospitals, building maintenance services, department stores, shopping malls, trade fairs, etc. Base stations configure the microcell structures with location registration and handoff features which will enable system planners to tailor the system economically to the diverse needs of traffic density and to eliminate the shadowing effects of building structures, walls, etc. The system features are described, including uses of the dynamic frequency assignment and flexible base station arrangement (irregularly located) within a microcell (or picocell) structure to ensure user-friendly operations, full extension of system flexibility, and significant increase in the traffic capacity within a highly dense traffic area.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"5 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":"127818555","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 digital Rayleigh fade compensation technique for coherent IJF-OQPSK systems 相干IJF-OQPSK系统的数字瑞利衰落补偿技术
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110412
J. Yang, K. Feher
{"title":"A digital Rayleigh fade compensation technique for coherent IJF-OQPSK systems","authors":"J. Yang, K. Feher","doi":"10.1109/VETEC.1990.110412","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110412","url":null,"abstract":"A digital pilot-symbol-aided Rayleigh fade compensation technique for coherent intersymbol interference-jitter-free offset quadrature phase shift keying (IJF-OQPSK) is proposed. Instead of a fixed valued pilot symbol sequence, a scrambled pilot symbol sequence is transmitted to measure, and therefore to compensate for, the Rayleigh fading channel. The bit error rate (BER) performance of this system is investigated in fast Rayleigh fading, additive white Gaussian noise (AWGN), and cochannel interference (CCI) environments by using computer simulation. The simulated results show that a 2.5 dB improvement is achieved over the differentially detected pi /4-DQPSK at a BER of 10/sup -3/. Unlike the differentially detected pi /4-DQPSK, the system does not have an error floor or residual bit error, provided that the frame length N is not longer than the upper limit of frame length, N/sub max/. Another significant advantage is that the proposed IJF-OQPSK modulated signal is shown to suffer less spectral spreading than pi /4-QPSK signaling over a nonlinearly amplified channel.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"6 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":"127825972","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: 10
Noncoherent block demodulation of PSK PSK的非相干块解调
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110356
H. Leib, S. Pasupathy
{"title":"Noncoherent block demodulation of PSK","authors":"H. Leib, S. Pasupathy","doi":"10.1109/VETEC.1990.110356","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110356","url":null,"abstract":"Noncoherent demodulation of phase shift keying (PSK) over a multisymbol observation interval is considered. It is shown that by performing noncoherent demodulation over an increased observation interval, the performance approaches that of coherent PSK. This block demodulation technique of PSK is a natural generalization of differentially coherent detection, and yields improved signal-to-noise ratio (SNR) performance. Some structural properties of this demodulation technique are explored, and its performance is analyzed by using the union-bound.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"42 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":"127989929","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: 22
Reliable multicast over the mobile packet radio channel 在移动分组无线电信道上可靠的多播
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110349
Y. Yamauchi
{"title":"Reliable multicast over the mobile packet radio channel","authors":"Y. Yamauchi","doi":"10.1109/VETEC.1990.110349","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110349","url":null,"abstract":"Point-to-multipoint (multicast) packet radio data transmission protocols over the erroneous vehicular communication environment are studied. In order to improve the reliability of the transmission, the ARQ (automatic repeat request) scheme is introduced onto the multicast packet data transmission, and several retransmission methods are compared. In the usual point-to-point ARQ schemes, response from the listener is either ACK or NAK. Thus, the listener responds with a reply frame regardless of whether the I-frame from the talker was received successfully. but in some cases, one of the ACK and the NAK responses is not necessary because the other has the opposite meaning. The approach is based on this point of view. The NAK is chosen for the response to the I-frame, so that if the I-frame is received successfully, then the listener issues no response to it. The method is called NAK only ARQ. The NAK only ARQ scheme has superior throughput characteristics in spite of its simplicity. Simulated performance comparisons are presented.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"29 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":"127484254","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
Experimental digital cellular system for microcellular handoff 微蜂窝切换实验数字蜂窝系统
40th IEEE Conference on Vehicular Technology Pub Date : 1990-05-06 DOI: 10.1109/VETEC.1990.110316
T. Kanai, M. Taketsugu, S. Kondo
{"title":"Experimental digital cellular system for microcellular handoff","authors":"T. Kanai, M. Taketsugu, S. Kondo","doi":"10.1109/VETEC.1990.110316","DOIUrl":"https://doi.org/10.1109/VETEC.1990.110316","url":null,"abstract":"An experimental digital cellular system composed of a private branch exchange (PBX)-based MSC (mobile switching center), three base stations, two mobile stations, and a radio channel simulator, is developed. The system uses a mobile originated handoff process; i.e. a mobile station requests a handoff to the MSC based on signal strength from surrounding base stations. All control channels are multiplexed on the same carrier so that mobile stations can monitor signal strength quickly. Experimental results show that a handoff decision can be made within a second, even under slow fading (such as walking speed), which agrees with the theoretical calculation very well. It is shown that the whole handoff procedure works reliably under a typical microcell propagation condition.<<ETX>>","PeriodicalId":366352,"journal":{"name":"40th IEEE Conference on Vehicular Technology","volume":"67 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":"133649226","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: 11
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