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

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Communication architectures for an integrated in-vehicle safety information system 集成车载安全信息系统的通信体系结构
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245245
G. Mayhew, K. Shirkey, P.D. Shloss
{"title":"Communication architectures for an integrated in-vehicle safety information system","authors":"G. Mayhew, K. Shirkey, P.D. Shloss","doi":"10.1109/VETEC.1992.245245","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245245","url":null,"abstract":"The intelligent vehicle highway system (IVHS) applies information technology to improve the effectiveness of the existing road transportation system resulting in increased safety and better traffic management. The in-vehicle safety advisory and warning system (IVSAWS) program is a two-year project to define and demonstrate a vehicular safety information system that provides both hazard alert and distress call capabilities. Warning units provide drivers with advance notification of roadway hazards in order to ameliorate these conditions. Incorporating a transmitter with the receiver in the motorist's vehicles enables IVSAWS units to summon assistance with a distress broadcast. Program aspects include hazard scenario identification, system architecture design, driver interface design, communication system design, and proof-of-concept field testing.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"77 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":"115116165","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
Video coding for very high rate mobile data transmission 视频编码用于非常高速率的移动数据传输
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245427
J. Vaisey, E. Yuen, J. Cavers
{"title":"Video coding for very high rate mobile data transmission","authors":"J. Vaisey, E. Yuen, J. Cavers","doi":"10.1109/VETEC.1992.245427","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245427","url":null,"abstract":"Research on high-capacity mobile communications is approaching modems capable of transmitting 64 kb/s in a 30-kHz channel. This rate has made it possible to conceive of new mobile services, the most ambitious of which is perhaps video. Although data rates of 64 kb/s are thought of as very high in the mobile environment, this is a very low rate for video. Many techniques for implementing video at rates between 64 and 128 kb/s have focused on teleconferencing or videophone over a high-quality channel. The results of the investigation into how to adapt the p*64 video coding standard so that it will be suitable for the coding of QCIF formal (176*144) video sequences for mobile transmission are presented. It is concluded that the codec design presented should be robust enough to allow reasonable quality video transmission over a mobile channel operating at 64 kb/s.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"45 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":"115139989","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
Optimum processing of multilevel CPFSK 多级CPFSK的优化加工
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245481
N. Bolourchi, D. Schilling
{"title":"Optimum processing of multilevel CPFSK","authors":"N. Bolourchi, D. Schilling","doi":"10.1109/VETEC.1992.245481","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245481","url":null,"abstract":"The improved probability of error of a narrowband continuous phase M-ary frequency shift keying (CPMFSK) system of B b/s/Hz (B>2) with a limiter-discriminator-integrator detector when compensating for the effect of the bandlimiting filter using a nonlinear postprocessor following the FM discriminator is determined. This postprocessor uses an adaptive decision scheme to combat the severe intersymbol interference caused by the bandlimiting filter. Error probability results are presented for the receiver, both with and without a postprocessor, as a function of various system parameters for M=2, 4, 8, and 16 symbols to support the superiority of this algorithm.<<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":"123633446","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
A combined CELP/Reed-Solomon codec for mobile radio applications 用于移动无线电应用的组合CELP/Reed-Solomon编解码器
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245443
H. Shi, P. Ho, V. Cuperman
{"title":"A combined CELP/Reed-Solomon codec for mobile radio applications","authors":"H. Shi, P. Ho, V. Cuperman","doi":"10.1109/VETEC.1992.245443","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245443","url":null,"abstract":"The performance of an error-protected speech codec for mobile radio applications is investigated. The speech codec is a 4 kb/s variation of the proposed Federal Standard 1016 CELP. The major difference is the use of a trained codebook (as opposed to a stochastic codebook in the proposed standard). The channel codec on the other hand, consists of a bank of rate-compatible punctured Reed-Solomon (RS) codes. The two subsystems are combined in an optimal fashion, according to the sensitivity of the speech elements. This implies that the most sensitive bits are protected by the most powerful RS codes, while the least sensitive bits are (either uncoded or) protected by the least powerful code. The performance of such a combined codec under different sets of system parameters and channel conditions is studied. In all cases, though, the aggregate rate is fixed at about 6.4 kb/s. The simulation results show that under the condition that there is no interleaving delay, the resulting codec can provide good quality speech at a channel bit error rate as high as 10/sup -2/.<<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":"122556649","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: 5
A 22 K Bd mobile video telephone scheme 22kbd流动视像电话方案
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245429
R. Stedman, R. Steele, H. Gharavi, L. Hanzo
{"title":"A 22 K Bd mobile video telephone scheme","authors":"R. Stedman, R. Steele, H. Gharavi, L. Hanzo","doi":"10.1109/VETEC.1992.245429","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245429","url":null,"abstract":"The complexity, image quality, bandwidth efficiency, and robustness issues of a mobile video telephone scheme for personal communications networks (PCNs) are addressed. The motion-compensated 55 kb/s subband codec using seven nonuniformly spaced active bands with bandspecific scanning and runlength coding achieves image peak signal-to-noise ratios (SNR) of around 38 dB, associated with good communications quality for monochrome common intermediate format images sampled at 10 frames per second. The motion dependent bitrate fluctuations are smoothed out by buffering with adaptive quantizer control feedback. The video bits are then sorted into two sensitivity classes and error protected by a twin-class binary BCH scheme. The separately BCH-encoded more significant bits (MSB) and less significant bits (LSB) are transmitted via separate subchannels of the 16-level quadrature amplitude modulator (16-QAM), having different integrity. The overall signaling rate becomes 22 kBd. No equalizer has to be used yet unimpaired image quality is achieved for channel SNR in excess of 20 dB.<<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":"123940343","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
Outdoor microcell measurements at 1700 MHz 室外微蜂窝测量1700兆赫
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245275
H. Borjeson, C. Bergljung, L. Olsson
{"title":"Outdoor microcell measurements at 1700 MHz","authors":"H. Borjeson, C. Bergljung, L. Olsson","doi":"10.1109/VETEC.1992.245275","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245275","url":null,"abstract":"An attempt is made to determine how different physical parameters affect the magnitude of the slopes and the location of the breakpoint for loss in both line-of-sight (LOS) and in non-line-of-sight (NLOS). A model for NLOS propagation using piecewise exponential functions is also presented. Multiparameter regression with the squared error between calculated and measured loss as minimizing function is performed to give the optimum fit between measured data and model parameters.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"14 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":"129440184","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: 21
Performance of decision feedback equalizers in urban and indoor mobile channels 决策反馈均衡器在城市和室内移动信道中的性能
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245377
Weifeng Huang, Theodore S. Rappaport, M. Feuerstein
{"title":"Performance of decision feedback equalizers in urban and indoor mobile channels","authors":"Weifeng Huang, Theodore S. Rappaport, M. Feuerstein","doi":"10.1109/VETEC.1992.245377","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245377","url":null,"abstract":"An idealized computer simulation of an equalizer using two-ray and measurement-based channel impulse response models is presented. A decision feedback equalizer (DFE) with a recursive least squares (RLS) algorithm is used as the equalization scheme. The results show that adaptive equalization can significantly improve the bit-error-rate (BER) of a mobile system if the channel does not change too rapidly. The simulation shows that in a two-ray Rayleigh fading channel, if the delay of the second ray is too small, then adaptive equalization will degrade the BER performance. The value of the delay at which the adaptive equalizer can improve the BER depends on the normalized Doppler frequency. A mobile channel simulator is used to show how much the equalizer can improve the BER in real-world urban channels. The performance of adaptive equalization for indoor high-data-rate systems is evaluated. An equalization structure for pi /4 DQPSK modulation is developed, and simulation results are presented.<<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":"129555637","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: 7
Error-free Group 3 facsimile terminal for cellular mobile telephone circuit 蜂窝式移动电话电路用无差错第3组传真终端
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245389
M. Kawabe, T. Yoshida, T. Sato, H. Etoh, M. Bessho
{"title":"Error-free Group 3 facsimile terminal for cellular mobile telephone circuit","authors":"M. Kawabe, T. Yoshida, T. Sato, H. Etoh, M. Bessho","doi":"10.1109/VETEC.1992.245389","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245389","url":null,"abstract":"A Group 3 error-free facsimile terminal developed for use in the cellular radio network is described. The terminal uses a CCITT V.27ter modem with eight-phase differential phase-shift keying (DPSK) modulation and an adaptive error control scheme developed for mobile telephone communication. An image data compression uses modified modified READ (MMR). The data transmission speed is 4800 b/s. The terminal can transmit a letter-size document (of the CCITT No. 1 chart) in 25 s.<<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":"128512984","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
The effect of chip waveform on the performance of CDMA systems in multipath, fading, noisy channels 芯片波形对多径、衰落、噪声信道中CDMA系统性能的影响
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245483
R. Anjaria, R. Wyrwas
{"title":"The effect of chip waveform on the performance of CDMA systems in multipath, fading, noisy channels","authors":"R. Anjaria, R. Wyrwas","doi":"10.1109/VETEC.1992.245483","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245483","url":null,"abstract":"The effect of non-ideal chip waveforms on the bit error rate (BER) performance of code division multiple access (CDMA) systems is analyzed. The waveforms considered include sine and raised cosine in addition to the ideal rectangular waveform. The waveforms are assumed to be time-limited to the chip duration and cause no interchip interference. The modulation type is differential phase shift keying (DPSK). The channel is modeled as a discrete set of Rayleigh faded paths, which makes the analysis appropriate for mobile cellular systems as well as indoor wireless communications. The receiver uses a matched filter (for despreading) and is followed by a RAKE type of receiver.<<ETX>>","PeriodicalId":114705,"journal":{"name":"[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology","volume":"23 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":"124529060","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
Voice scrambling for radio, cellular and telephone systems 无线电、蜂窝和电话系统的语音干扰
[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI: 10.1109/VETEC.1992.245266
A. Bateman, J. Marvill, J. Mcgeehan
{"title":"Voice scrambling for radio, cellular and telephone systems","authors":"A. Bateman, J. Marvill, J. Mcgeehan","doi":"10.1109/VETEC.1992.245266","DOIUrl":"https://doi.org/10.1109/VETEC.1992.245266","url":null,"abstract":"An overview of the requirements of a scrambler for use with mobile radio equipment is presented. Details of the implementation of a scrambler are given satisfying these requirements. The scrambler is realized using general-purpose DSP technology giving the benefits of low-cost, high-volume production with the flexibility of customization and enhancement though software configuration.<<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":"129835839","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
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