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IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond最新文献

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A slotted ALOHA with multiple common receivers over AWGN Rayleigh-fading channels 在AWGN瑞利衰落信道上具有多个公共接收器的开槽ALOHA
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64006
K. Sakakibara, M. Serizawa
{"title":"A slotted ALOHA with multiple common receivers over AWGN Rayleigh-fading channels","authors":"K. Sakakibara, M. Serizawa","doi":"10.1109/GLOCOM.1989.64006","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64006","url":null,"abstract":"The capture probability for an inbound radio channel in a radio LAN (local area network) is formulated in a closed form by taking into account both AWGN (additive white Gaussian noise) and Rayleigh fading. The received power ratio between a packet signal with minimum received power and an interference signal is considered as a criterion for the capture effect. It is revealed that, though the maximum overall throughput for a slotted ALOHA over Rayleigh fading channels is very vulnerable to AWGN for a single common-receiver case, pluralizing common receivers dramatically improves the overall throughput. Surprisingly, it has also been found that, even if the signal-to-noise ratio is as bad as 2.5 (dB), the instability of a slotted ALOHA over Rayleigh-fading channels is still much less serious than that over channels without capture. This means that the capture effect overwhelms AWGN regarding stability.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"472 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124394626","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
A high performance diversity selection technique for TDMA portable radio communications 一种用于时分多址便携式无线电通信的高性能分集选择技术
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64174
J. Chuang, N. Sollenberger
{"title":"A high performance diversity selection technique for TDMA portable radio communications","authors":"J. Chuang, N. Sollenberger","doi":"10.1109/GLOCOM.1989.64174","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64174","url":null,"abstract":"The authors describe and show performance results for a diversity-selection technique in a frequency-selective fading portable radio channel. Diversity selection is performed by using a quality measure obtained from the demodulation process. This technique is compared to diversity selection based on power and diversity selection after channel decoding. It is found that this diversity selection technique is more effective in mitigating selective fading than a conventional technique based on power and that it performs almost as well as diversity selection after channel decoding. This diversity selection technique can be implemented at the portable handset by using only one receiver if the base station transmits in at least one time slot in addition to the communication slot. Thus, its use does not significantly increase the portable's hardware complexity. Simulations and experiments have confirmed that two-branch diversity using the proposed method can provide reliable speech communications using TDMA (time division multiple access) for a portable radio channel with RMS spread of 555 ns or less and a transmission rate of 450 kb/s.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114671464","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: 14
A facility for near end crosstalk measurements on ISDN subscriber loops ISDN用户环路上近端串扰测量设备
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64214
A. Fung, L. Lee, D. Falconer
{"title":"A facility for near end crosstalk measurements on ISDN subscriber loops","authors":"A. Fung, L. Lee, D. Falconer","doi":"10.1109/GLOCOM.1989.64214","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64214","url":null,"abstract":"A facility for making near-end crosstalk measurements on multipair cable is described. This facility yields pair-to-pair frequency- and time-domain responses, useful for characterizing crosstalk in digital loop transmission. Through measurements with multiple synchronous ISDN (integrated services digital network) loop transmitters, it also allows measurement and characterization of cyclostationary crosstalk variation. Preliminary results clearly show this cyclostationary characteristic.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125224131","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
Placing repeaters in multi-hop packet radio networks 在多跳分组无线网络中放置中继器
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64062
A. Kakaes, R. Boorstyn
{"title":"Placing repeaters in multi-hop packet radio networks","authors":"A. Kakaes, R. Boorstyn","doi":"10.1109/GLOCOM.1989.64062","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64062","url":null,"abstract":"One of the main factors that limit the throughput in multihop packet radio networks is the large number of hops over which some pairs of nodes must communicate. The authors present a heuristic algorithm to sequentially place an arbitrary number of repeaters with the objective of maximizing the throughput of the resulting networks. The heuristic attempts to reduce the average number of hops that packets must be transmitted over, without increasing interference at the nodes. Even if the average number of hops is not reduced significantly, it creates a number of other paths (of the same length), and thus congestion is avoided. Results are presented for one particular protocol, code division multiple access with noise threshold theta . The authors also present instances for which the heuristic fails, with an explanation of why it fails.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116687595","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
Multi-symbol detection of M-DPSK M-DPSK的多符号检测
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64232
Stephen G. Wilson, James Freebersyser, Christopher Marshall
{"title":"Multi-symbol detection of M-DPSK","authors":"Stephen G. Wilson, James Freebersyser, Christopher Marshall","doi":"10.1109/GLOCOM.1989.64232","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64232","url":null,"abstract":"The authors discuss optimal and suboptimal detection methods for improving the error performance when M-ary DPSK (differential phase shift keying) modulation is employed. All procedures use a block of N+1 measurements to produce N data decisions. The motivation is to lessen the energy penalty associated with classical DPSK detection and to approach the performance of fully-coherent detection, but without complicated feedback phase-tracking circuitry and the associated phase-acquisition time. The authors formulate optimal (block) detection under the assumption of unknown carrier phase. Performance analysis and simulation show significant improvement with increasing blocklength, but complexity increases exponentially in blocklength. Suboptimal methods are then proposed which have far less complexity, but retain the improvement over standard DPSK. The primary applications of the present work are in fast-acquisition TDMA (time-division multiple-access) systems with PSK modulation and in frequency-hopping systems using DPSK.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116912564","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: 83
Probability of error analysis of digital partial response continuous phase modulation with two bit differential detection and offset receiver diversity in fast Rayleigh fading 快速瑞利衰落条件下具有二位差分检测和偏置接收机分集的数字部分响应连续相位调制的误差概率分析
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63949
S. Elnoubi
{"title":"Probability of error analysis of digital partial response continuous phase modulation with two bit differential detection and offset receiver diversity in fast Rayleigh fading","authors":"S. Elnoubi","doi":"10.1109/GLOCOM.1989.63949","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63949","url":null,"abstract":"The performance of constant envelope digital partial response continuous phase modulation (PRCPM) with two-bit differential detection and offset receiver diversity is theoretically analyzed in fast Rayleigh fading AWGN (additive white Gaussian noise) channels. A simple closed-form expression for the probability of error is derived and evaluated for cases of practical interest to researchers and designers of land mobile radio systems. It is shown that the dynamic BER performance is considerably improved using the offset diversity scheme. Thus, many new PRCPM signals having compact power spectra can be used in future mobile radio systems.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"156-157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117179653","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
Network architecture for satellite aided ISDN network: one approach for satellite-terrestrial integrated network 卫星辅助ISDN网络体系结构:星地一体化网络的一种途径
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64181
T. Masamura, Y. Shikata
{"title":"Network architecture for satellite aided ISDN network: one approach for satellite-terrestrial integrated network","authors":"T. Masamura, Y. Shikata","doi":"10.1109/GLOCOM.1989.64181","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64181","url":null,"abstract":"The authors describe a method of integrating nonhierarchical satellite communication systems into hierarchical ISDN networks (integrated services digital networks). The configurations of a satellite-terrestrial integrated network are classified into four basic forms. A new application of subscriber/transit integrated communication networks that combines the basic forms is proposed. With a new concept called virtual transit switching these networks can realize farthest-end routing without modifying the existing call control scheme for terrestrial networks. An ISDN-oriented, satellite dedicated network based on this concept is also proposed. It is confirmed by network cost evaluation that a satellite-terrestrial integrated network is more desirable than independent terrestrial or satellite communication networks.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127316915","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
Viceo compression for manned space missions 载人航天任务的视频压缩
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63976
R. Viola, L. Chiariglione, R. Russo
{"title":"Viceo compression for manned space missions","authors":"R. Viola, L. Chiariglione, R. Russo","doi":"10.1109/GLOCOM.1989.63976","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63976","url":null,"abstract":"A complete design solution for transmitting video compressed images from orbiting spacecraft is presented. The design drives were maximum flexibility and minimization of equipment weight, power, and dimensions. The video multiplexing system is designed to maintain asynchronous access to the link while preserving an internally synchronous structure. Reed-Solomon codes are used to obtain a practically error-free system with low overhead. Coder and decoder are able to work asynchronously. The selected coding algorithm is DCT based and allows a variable bit rate from 64 to 2048 kbit/s and also transmission of fixed images with full resolution. The presented design results show that only by developing ad hoc VLSI chips can the severe constraints for mass and power consumption of the flight hardware be met.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127489626","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 hybrid data compression scheme using quaternary decomposition and selective multistage vector quantization 采用四元分解和选择性多阶段矢量量化的混合数据压缩方案
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64268
L. Thede, S. Kwatra
{"title":"A hybrid data compression scheme using quaternary decomposition and selective multistage vector quantization","authors":"L. Thede, S. Kwatra","doi":"10.1109/GLOCOM.1989.64268","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64268","url":null,"abstract":"The hybrid coding method investigated uses classified vector quantization (VQ) based upon the quaternary decomposition of image blocks into 32*32, 16*16, 8*8, or 4*4 subblocks before using the DCT (discrete cosine transform) to encode the blocks. The coefficients of the DCTs are then zonal-sampled and vector quantized. The codebooks for the VQ are optimized by both the traditional Linde-Buzo-Gray (1980) method and by a simulated annealing (SA) algorithm. In addition a method of selective multistage VQ (SMVQ) is investigated in which only those vectors not matched well enough by a codebook vector are allowed a second stage of VQ. These methods produce excellent results at bit rates of 0.8586 b/pixel. for non-SMVQ methods and 0.994 b/pixel for SMQV methods for 512*512 color images.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124903871","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
New distortion measure in regular pulse excitation speech coding 规则脉冲激励语音编码中新的失真测量方法
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64156
S. Kang, T. Fischer
{"title":"New distortion measure in regular pulse excitation speech coding","authors":"S. Kang, T. Fischer","doi":"10.1109/GLOCOM.1989.64156","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64156","url":null,"abstract":"The authors introduce a new distortion measure for determining the amplitudes of the regular pulse sequence used in regular-pulse excitation speech coding. The method combines the adaptive predictive distortion criterion with the distortion measure used in the typical regular-pulse excitation system and reduces the degradation due to pulse amplitude quantization. Experimental results show that the proposed distortion measure provides increases of about 0.7 to 1 dB in segmental signal-to-noise ratio, a better reproduction of the original spectrogram, and perceptually good speech quality at medium bit rates (of about 16 kb/s).<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"46 45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125383208","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
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