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Minimal complexity design of analytically described trellis codes 最小复杂性设计的分析描述网格代码
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13653
J. M. Turgeon, P. McLane
{"title":"Minimal complexity design of analytically described trellis codes","authors":"J. M. Turgeon, P. McLane","doi":"10.1109/ICC.1988.13653","DOIUrl":"https://doi.org/10.1109/ICC.1988.13653","url":null,"abstract":"G. Ungerboeck (1982) has shown how to specify trellis codes that have some power gain and the same bandwidth as their corresponding uncoded schemes. He realizes his trellis codes by a convolutional encoder followed by a mapping rule. R. Calderbank and J.E. Mazo (1984) have shown how to realize these two operations in a single-step procedure, thus yielding analytically described trellis codes. These ideas are extended to any number of dimensions and to rotationally invariant trellis codes. Design rules that yield minimal complexity for analytically described trellis codes are presented, and these rules generally provide a hand design for trellis codes. A 2-D and 4-D example are used to illustrate the author's approach.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114678749","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
A user's experience validating telecommunications software using symbolic emulation 使用符号仿真验证电信软件的用户体验
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13764
D.E. Mello
{"title":"A user's experience validating telecommunications software using symbolic emulation","authors":"D.E. Mello","doi":"10.1109/ICC.1988.13764","DOIUrl":"https://doi.org/10.1109/ICC.1988.13764","url":null,"abstract":"The Interactive Testing Facility (ITF) a testing system that resides on an IBM mainframe computer system and allows the symbolic execution of GTD-5 EAX telecommunications software without using the prototype environment, is described. ITF's chief purpose is to improve software quality by aiding in the error-detection process. The reason for using it as a quality-control tool, ITF's advantages over other testing methods, and ITF's application in the validation of the automatic message accounting (AMA) software developed for the GTD-5 EAX system are presented.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115752248","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
Interference dynamics considerations in digital radio performance estimation 数字无线电性能估计中的干扰动力学考虑
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13718
A.B. Adenigba, A. Tsolakis
{"title":"Interference dynamics considerations in digital radio performance estimation","authors":"A.B. Adenigba, A. Tsolakis","doi":"10.1109/ICC.1988.13718","DOIUrl":"https://doi.org/10.1109/ICC.1988.13718","url":null,"abstract":"Digital radio performance degradation due to interference is significant in the latest 64 QAM technology and must be considered during the path design of a digital radio facility. A route engineering tool, based on a model that considers radio interference to be time-varying has been developed for designing rugged digital radio paths in a radio interference environment. The long-term statistics of interference dynamics during multipath fading is modeled as a lognormal distribution with a standard deviation dependent on terrain roughness. Analysis of multipath fading data obtained from a distance experiment has shown a linear relationship between the standard deviation of the interference and the fade depth of the desired signal. When this interference dynamics model is used to calculate the expected outage in a 64 QAM digital radio system equipped with space diversity (at a junction station with average terrain roughness, a free space C/l of 60 dB, and a standard deviation of 4 dB), a 200% increase in outage is predicted over the outage predicted by the constant interference model.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116986220","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
Multipath fading effects in a 40 MHz channel 40 MHz信道中的多径衰落效应
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13824
M. D. Caskey, K. W. Moreland
{"title":"Multipath fading effects in a 40 MHz channel","authors":"M. D. Caskey, K. W. Moreland","doi":"10.1109/ICC.1988.13824","DOIUrl":"https://doi.org/10.1109/ICC.1988.13824","url":null,"abstract":"Experimental results are presented for the multipath channel characterization of a 40 MHz wide RF channel in the 4 GHz band. The 40 MHz wide test signal is transmitted over a 52 km hop. The space diversity receiver combines the test signal using a continuous phase maximum power technique. Channel responses are measured on the main antenna, the diversity antenna, and the combined channel. The effects of bandwidth on in-band power-difference are also described.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121021131","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
Decision feedback equalization and carrier recovery in 140 Mbit QAM digital radio systems 140 Mbit QAM数字无线电系统中的决策反馈均衡与载波恢复
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13768
J. Olmos, R. Agustí, F. Casadevall
{"title":"Decision feedback equalization and carrier recovery in 140 Mbit QAM digital radio systems","authors":"J. Olmos, R. Agustí, F. Casadevall","doi":"10.1109/ICC.1988.13768","DOIUrl":"https://doi.org/10.1109/ICC.1988.13768","url":null,"abstract":"The tracking behavior of a decision-feedback equalizer coupled to a carrier recovery loop in the presence of dynamic multipath-fading activity is studied. Minimum-phase/non-minimum-phase-type fading transitions, with notch-depth variation-rates up to 120 dB/s, and fadings sweeping across the signal band at 300 MHz/s, are considered. Free interaction between the two adaptive devices is allowed. Simulated tap gains are compared to those theoretically obtained to justify the observed RMS error increase, which can eventually lead to the system outage. The extra degree of freedom arising in the recovered carrier phase does not seem to disturb the behavior of the coupled system.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127177532","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
Optical protection switches for trunk transmission systems 干线传输系统用光保护开关
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13524
K. Aida, S. Nishi, K. Nakagawa
{"title":"Optical protection switches for trunk transmission systems","authors":"K. Aida, S. Nishi, K. Nakagawa","doi":"10.1109/ICC.1988.13524","DOIUrl":"https://doi.org/10.1109/ICC.1988.13524","url":null,"abstract":"Two different types of optical matrix switches are presented for use as protection switches. One is an optoelectronic matrix switch using Si pin photodiodes. The first switch configuration offers two advantages for large matrix fabrication: high off-state output impedance and no electrical power requirement for establishing the off-state. The other is an optical-wavelength-division matrix switch, using an acoustooptic deflector, which requires minimal hardware for switching and realizes unlimited bandwidth. The switching speed, crosstalk, attainable matrix size, and optical source requirements are evaluated for both switches. Their protection system application schemes are clarified.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127193154","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
High speed onboard digital signal processing and LSI implementation (satellite communications) 高速板载数字信号处理及大规模集成电路实现(卫星通信)
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13615
M. Morikura, K. Enomoto, S. Kato
{"title":"High speed onboard digital signal processing and LSI implementation (satellite communications)","authors":"M. Morikura, K. Enomoto, S. Kato","doi":"10.1109/ICC.1988.13615","DOIUrl":"https://doi.org/10.1109/ICC.1988.13615","url":null,"abstract":"The authors propose the optimum configuration of onboard high speed signal processing employing extremely high speed serial-to-parallel (S/P) converters and high speed unique word detectors followed by low speed digital signal processing circuits for the receive side onboard TDMA equipment. Experimental results show that the GaAs P/S and S/P conversion LSIs operate up to a frequency of 1 GHz range, and the CMOS/SOS unique word detector LSI operates up to a frequency of 200 MHz in a 2-parallel processing mode. As a result, it is clarified that the proposed configuration is optimum for onboard high speed signal processing under present LSI technologies.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127507750","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
A methodology for designing survivable telephone networks 设计可生存电话网络的方法学
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13737
R.E. McGorman
{"title":"A methodology for designing survivable telephone networks","authors":"R.E. McGorman","doi":"10.1109/ICC.1988.13737","DOIUrl":"https://doi.org/10.1109/ICC.1988.13737","url":null,"abstract":"A study is made of the impact of transmission link and switch failures on blocking levels in both long-distance and metropolitan networks. An analytic model is derived to provide an upper bound on the blocking in a failure as a function of the loss of trunking capacity. Extensive simulation studies have been used to validate the model. A process for designing survivable networks is outlined.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125424442","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 of CPM using a discriminator based data detector 基于鉴别器的数据检测器的CPM性能
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13660
M. El-Tanany, S. Mahmoud
{"title":"Performance of CPM using a discriminator based data detector","authors":"M. El-Tanany, S. Mahmoud","doi":"10.1109/ICC.1988.13660","DOIUrl":"https://doi.org/10.1109/ICC.1988.13660","url":null,"abstract":"It is demonstrated that the error rate performance of continuous phase modulation (CPM), when detected using a limiter discriminator followed by a 2-bit integrate-and-dump filter (IDF), is far superior to the performance obtained using a discriminator followed by a 1-bit IDF. The performance obtained at a modulation index h=1/2 is quite comparable to that of the 2-bit differentially coherent detector. A parameterized performance study shows that drastic improvements are achievable by properly selecting the modulation index and simultaneously optimizing the receive filter bandwidth. The investigation also shows that the error performance is sensitive to the type of IF filter response, i.e., the Butterworth response yields superior performance in comparison to the Gaussian filter response.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115052588","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
A vendor-customer relationship to improve product quality 建立供应商-客户关系，提高产品质量
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13679
J.L. Reffett
{"title":"A vendor-customer relationship to improve product quality","authors":"J.L. Reffett","doi":"10.1109/ICC.1988.13679","DOIUrl":"https://doi.org/10.1109/ICC.1988.13679","url":null,"abstract":"The author shows how AT&T shared information on its development process with its customers to gain customer insight. He also describes how AT&T was able to respond to customer process improvement issues. He explains how the development process was reviewed, how the review was merged into AT&T's ongoing improvement process, and how both AT&T and the regional Bell Operating Companies have benefited from this cooperative relationship.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115578825","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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