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Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)最新文献

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Comparison of very low rate coding methods for CDMA radio communications system CDMA无线电通信系统中极低速率编码方法的比较
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379580
K. Rikkinen
{"title":"Comparison of very low rate coding methods for CDMA radio communications system","authors":"K. Rikkinen","doi":"10.1109/ISSSTA.1994.379580","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379580","url":null,"abstract":"The paper considers coherent transmission of very low rate coded signals in DS-CDMA radio communications system. The coding methods discussed are orthogonal convolutional coding and biorthogonal convolutional coding. For these codes, bit error rate (BER) bounds are determined in a white Gaussian noise channel environment. The performance of these schemes in a Rayleigh fading channel are discussed with simulation results. It is found that for the same code rate, biorthogonal convolutional coding gives a much better BER performance than the other scheme with slightly added complexity in the decoder.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129980809","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
Spatial and temporal filtering for co-channel interference in CDMA CDMA中同信道干扰的时空滤波
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379616
R. Kohno
{"title":"Spatial and temporal filtering for co-channel interference in CDMA","authors":"R. Kohno","doi":"10.1109/ISSSTA.1994.379616","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379616","url":null,"abstract":"This paper provides a review of the challenges and opportunities that arise for improving the user capacity of spread spectrum multiple access (SSMA) or code division multiple access (CDMA) based on spread spectrum techniques. Co-channel interference (CCI) in CDMA is the most dominant factor in the limitation of user capacity, while the capacities of FDMA and TDMA capacities are primarily bandwidth limited. From an information theoretical viewpoint, however, an optimum multi-user receiver for CDMA can be derived by utilizing CCI as redundant information distributed among multiple accessing users. In practical channels such as personal, indoor, mobile radio communication channels, more feasible receivers are required to combat the multipath fading that causes estimation errors of the channel characteristics due to time variance. An overview of several CCI cancellation schemes for sub-optimum but practical multi-user receivers for CDMA is provided by classifying them in the temporal domain, the spatial domain, or in both domains.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133937998","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: 27
Adaptive multiuser detection 自适应多用户检测
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379617
Sergio Verdú
{"title":"Adaptive multiuser detection","authors":"Sergio Verdú","doi":"10.1109/ISSSTA.1994.379617","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379617","url":null,"abstract":"An important thrust in research in multiuser detection is the design of adaptive detectors, which self-tune the detector parameters from the observation of the received waveform. The literature on this subject is surveyed in this tutorial paper. It contains background material used throughout the paper on the multiaccess channel model, optimum multiuser detection and the decorrelating detector. It deals with the MMSE linear multiuser detector and its adaptive implementations, and gives an overview of adaptive tentative-decision based detectors such as those that use successive cancellation and decision-feedback. Blind multiuser detection is discussed, and in particular, it presents a multiuser detector which is optimally near-far resistant and requires no more knowledge than the conventional single-user detector. Multiuser detection using learning neural networks is also examined.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134262892","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: 197
Cascaded combination of cancelling co-channel interference and decoding of error-correcting codes for CDMA 消除同信道干扰与码分多址纠错码译码的级联组合
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379601
A. Saifuddin, R. Kohno, H. Imai
{"title":"Cascaded combination of cancelling co-channel interference and decoding of error-correcting codes for CDMA","authors":"A. Saifuddin, R. Kohno, H. Imai","doi":"10.1109/ISSSTA.1994.379601","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379601","url":null,"abstract":"In this paper, we propose and analyze a direct sequence spread spectrum multiaccess (DS/CDMA) receiver that employs an integrated filtering and decoding technique for cancellation of cochannel interference (CCI) in cascaded form. We consider channels that experience multipath returns which is one of the factors responsible for signal degradation in mobile communication systems. The idea behind the integrated filtering is that CCI can be more reliably estimated by exploiting coding. We investigate the BER performance of the proposed scheme by theoretical analysis. Both numerical and simulation results exhibit the significant improvement that can be attained by the proposed scheme compared to the conventional scheme.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133494138","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
Application of digital signal processing in spread spectrum systems 数字信号处理在扩频系统中的应用
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379606
E. Palo
{"title":"Application of digital signal processing in spread spectrum systems","authors":"E. Palo","doi":"10.1109/ISSSTA.1994.379606","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379606","url":null,"abstract":"Spread spectrum techniques have been used for many years, primarily by the military. Practical applications in the civil community are have recently stirred a significant new interest in spread spectrum communications. Continuing advances in digital technology are making it feasible to implement key spread spectrum functions in small and affordable packages. Signal processing architectures, suitable for VLSI designs, to accomplish interference suppression and signal/channel-matched filtering have been developed. Prototype devices have been implemented and demonstrated.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114839315","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
The evolution of spread-spectrum multiple-access communications 扩频多址通信的发展
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379623
R. Scholtz
{"title":"The evolution of spread-spectrum multiple-access communications","authors":"R. Scholtz","doi":"10.1109/ISSSTA.1994.379623","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379623","url":null,"abstract":"This paper contains a brief history of electrical communications, emphasizing the emergence of multiple-access and spread-spectrum techniques. Events that led to the commercialization of spread-spectrum signalling are described.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128305457","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: 28
The effect of multipath fading on the radiometric detection of frequency hopped signals 多径衰落对跳频信号辐射检测的影响
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379586
S. MacMullan
{"title":"The effect of multipath fading on the radiometric detection of frequency hopped signals","authors":"S. MacMullan","doi":"10.1109/ISSSTA.1994.379586","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379586","url":null,"abstract":"The effect of fading due to multipath is seldom accounted for in the assessment of the vulnerability of frequency hopped communications systems to radiometric intercept threats. However, the results derived in the paper illustrate that fading due to multipath could significantly improve the ability of a radiometer to detect frequency hopped signals transmitted at sea.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132969797","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
Performance comparison of number- and coherent-state optical CDMA in lossy direct-detection photon channels 有损直接探测光子信道中数态与相干态光CDMA的性能比较
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379520
H. Shalaby
{"title":"Performance comparison of number- and coherent-state optical CDMA in lossy direct-detection photon channels","authors":"H. Shalaby","doi":"10.1109/ISSSTA.1994.379520","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379520","url":null,"abstract":"The performance of optical code-division multiple-access (CDMA) communication systems utilizing number-state light field is evaluated. Lossy direct detection optical channels are assumed. Both on-off keying (OOK) and pulse-position modulation (PPM) schemes are investigated. For OOK, the exact bit error rate is evaluated taking into account the effect of both multiple-user interference and transmission loss. Upper and lower bounds on the bit error probability for PPM-CDMA systems are derived under the above considerations. The effect of both background and thermal noise is neglected in the analysis. A comparison between the performance of the number- and coherent-state OOK/PPM-CDMA networks is also presented. The results demonstrate that the number-state system requires less than half the energy consumed by the coherent-state one in order to attain the same performance.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123468529","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 effects of transmitter filtering on the performance of direct sequence spread spectrum multiple access systems 发射机滤波对直接序列扩频多址系统性能的影响
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379521
T. Ikegami, M. Pursley
{"title":"The effects of transmitter filtering on the performance of direct sequence spread spectrum multiple access systems","authors":"T. Ikegami, M. Pursley","doi":"10.1109/ISSSTA.1994.379521","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379521","url":null,"abstract":"The effects of filtering in transmitters on the bit error performance of a binary asynchronous direct sequence spread spectrum communication system are examined in a multiple access environment. Computer simulations are carried out to evaluate the effects of non-linear phase Chebyshev and Butterworth filters and linear phase Bessel, Gauss and Nyquist roll-off filters. The performance degradation of the system is compared and discussed in terms of the BT product of the filter or the transmitted spectrum.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122013818","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
On cross-ambiguity properties of Welch-Costas arrays when applied in SS/FH multiuser radar and sonar systems SS/FH多用户雷达和声纳系统中Welch-Costas阵列交叉模糊特性研究
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379537
S. Maric, I. Seskar, E. Titlebaum
{"title":"On cross-ambiguity properties of Welch-Costas arrays when applied in SS/FH multiuser radar and sonar systems","authors":"S. Maric, I. Seskar, E. Titlebaum","doi":"10.1109/ISSSTA.1994.379537","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379537","url":null,"abstract":"We discuss cross-ambiguity properties of a specific family of Costas (1984) arrays called Welch-Costas (W-C) arrays. These properties are of interest in multiuser radar and sonar systems. Especially since Costas arrays are known to posses ideal auto-ambiguity functions. The theory of W-C arrays is reviewed. It is then proved that only pairs of W-C arrays can have at most two hits in their cross-ambiguity function (best possible case). The maximum number of hits in the cross-ambiguity functions of a family of W-C arrays is shown to be a function of the number of W-C arrays in the family. The upper bound on the number of hits in the cross-ambiguity functions for a family of W-C arrays is also derived. Specific examples of how reducing the number of W-C arrays improves the cross-ambiguity properties are given for various types of prime numbers.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125061561","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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