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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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An effect of a DS-SSMA system on narrow-band communication systems using frequency region in common and its rejection method DS-SSMA系统对共频域窄带通信系统的影响及其抑制方法
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379532
M. Kominami, S. Ikuta, T. Nakai, H. Kusak
{"title":"An effect of a DS-SSMA system on narrow-band communication systems using frequency region in common and its rejection method","authors":"M. Kominami, S. Ikuta, T. Nakai, H. Kusak","doi":"10.1109/ISSSTA.1994.379532","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379532","url":null,"abstract":"When a DS-SSMA communication system uses in common the frequency region which narrow-band communication systems have used, the interference power falling on the narrow-band systems from the SS system should be considered. We propose a method that rejects the interference signal component on the transmitting side of the SS system and the transmission signals of the narrow-band systems on the receiving side of the SS system. We clarify the relationship between the signal-to-noise power ratio of the SS system with these band rejection filters and the ratio of narrow bandwidth to the chip rate, and show that prediction error filters are useful to the rejection filters.<<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":"116014219","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
DS/CDMA successive interference cancellation DS/CDMA连续干扰消除
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379614
J. M. Holtzman
{"title":"DS/CDMA successive interference cancellation","authors":"J. M. Holtzman","doi":"10.1109/ISSSTA.1994.379614","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379614","url":null,"abstract":"Conventional DS/CDMA detectors operate by enhancing a desired user while suppressing other users, considered as interference (multiple access interference, MAI) or noise. A different viewpoint is to consider other users not as noise but to jointly detect all users' signals (multiuser detection). This has significant potential of increasing capacity and near/far resistance. Optimal multiuser detection is, however, too complex to implement, thus motivating the search for suboptimal algorithms. Our objective is to underline the need for simplicity and to discuss what is a relatively simple form of multiuser detection (at the base station of a cellular system), successive interference cancellation. The cancellation scheme uses only components already present in a conventional detector.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"43 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":"116392984","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: 126
Nonlinear effect of direct-sequence CDMA in optical transmission 直接序列CDMA在光传输中的非线性效应
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379517
W. Huang, M. Nakagawa
{"title":"Nonlinear effect of direct-sequence CDMA in optical transmission","authors":"W. Huang, M. Nakagawa","doi":"10.1109/ISSSTA.1994.379517","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379517","url":null,"abstract":"The intermodulation distortion (IMD) due to laser diode (LD) nonlinearity of an asynchronous direct-sequence code division multiple access (DS/CDMA) system in optical transmission is analyzed. A third-order polynomial without memory is used to present LD nonlinearity. In DS/CDMA systems, only one harmonic of the third-order intermodulation term falls on the signal frequency band and influences the system performance. The average distortion is derived with only the information of auto-correlation functions. The results are useful for CDMA system design and performance analysis. With LD nonlinearity it is necessary to select an optimal modulation index that provides a maximum carrier-to-noise ratio (CIN). The effect of the LD nonlinearity on CDMA and frequency-division multiple access (FDMA) is also compared. The analytical method is applicable to other general nonlinearities in CDMA systems.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"223 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":"115738657","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
4-phase DS-CDMA mobile radio receiver in non-Gaussian environment 非高斯环境下4相DS-CDMA移动无线电接收机
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379547
S. Cacopardi, F. Frescura, G. Reali
{"title":"4-phase DS-CDMA mobile radio receiver in non-Gaussian environment","authors":"S. Cacopardi, F. Frescura, G. Reali","doi":"10.1109/ISSSTA.1994.379547","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379547","url":null,"abstract":"The aim of the paper is to investigate the performance of digital mobile radio communications using the RAKE receiver under impulsive environments. The performances studies are carried out in terms of spectral efficiency and bit error probability. The assumed modulation technique is QPSK. The signature sequences used for spreading the signal are complex valued and characterized by different correlation properties; the possible choices lead to a performance comparison based on the properties of the sequences in order to maximize the number of users per cell.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"35 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":"114457097","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
Consumer communications based on spread spectrum techniques 基于扩频技术的消费者通信
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379607
M. Nakagawa
{"title":"Consumer communications based on spread spectrum techniques","authors":"M. Nakagawa","doi":"10.1109/ISSSTA.1994.379607","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379607","url":null,"abstract":"This paper shows consumer applications of spread spectrum techniques in the following areas: power line communication, data carrier, radio remote control, ISM wireless LAN, vehicle to vehicle communication, and digital TV broadcasting. One of the most difficult problems for a spread spectrum communication system is how to synchronize the receiver to the transmitted signal. The sliding correlator method is the typical and simplest, but needs a long acquisition time for synchronisation. Matched filter and convolver methods need much shorter acquisition time and SAW devices are adapted to them.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"16 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":"134131378","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: 6
Hadamard codewords as orthogonal spreading sequences in synchronous DS CDMA systems for mobile radio channels 用于移动无线电信道的同步DS CDMA系统中的正交扩展序列哈达玛码字
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379534
M. Schnell
{"title":"Hadamard codewords as orthogonal spreading sequences in synchronous DS CDMA systems for mobile radio channels","authors":"M. Schnell","doi":"10.1109/ISSSTA.1994.379534","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379534","url":null,"abstract":"This paper addresses the question if orthogonal spreading sequences, especially Hadamard codewords, can improve the performance of synchronous direct-sequence code-division multiple-access systems applied in a mobile radio environment. For this purpose, the correlation properties of Hadamard codewords are determined and performance simulations are carried out. The results show, that Hadamard codewords have rather poor autocorrelation properties and very inhomogeous crosscorrelation properties ranging from excellent up to very poor depending on which codeword is considered. The performance simulations reveal a behaviour similar to the crosscorrelation properties. Using additional scrambling the autocorrelation properties are improved and the crosscorrelation properties are made more homogenous yielding performance results similar to those obtained for conventional spreading using Gold-codes or preferentially phased Gold-codes.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"65 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":"132079329","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: 17
Performance of a direct-sequence spread-spectrum system with RAKE reception in a multipath fading environment 多径衰落环境下具有RAKE接收的直接序列扩频系统的性能
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379542
D. Goeckel, W. Stark
{"title":"Performance of a direct-sequence spread-spectrum system with RAKE reception in a multipath fading environment","authors":"D. Goeckel, W. Stark","doi":"10.1109/ISSSTA.1994.379542","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379542","url":null,"abstract":"The probability of error is determined for a coherent direct-sequence spread-spectrum system with RAKE reception operating in a specular multipath fading environment. The model that is utilized contains a large number of paths divided into groups across the signalling interval. The RAKE is able to lock onto the direct path (delay 0) and one path from each of a subset of the other groups. Approximations are made to the probability of error using the characteristic function method. The effects of the processing gain of the system and the number of branches in the RAKE receiver on the probability of error are explored. Comparisons are made with the error probability obtained using the standard Gaussian approximation for the interference.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"5 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":"114824491","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
Modulation and coding schemes for TDM/SS packet radio TDM/SS分组无线电的调制和编码方案
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379525
K. Yates, S. U. Zaman
{"title":"Modulation and coding schemes for TDM/SS packet radio","authors":"K. Yates, S. U. Zaman","doi":"10.1109/ISSSTA.1994.379525","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379525","url":null,"abstract":"A novel frequency hopped spread spectrum packet radio communication system suitable for time division multiplexed, high speed indoor office wireless networks is proposed. The hopping is carried out at a logical level on the bit stream rather than physical hopping of the carriers. This on one hand eliminates phase problems associated with differential modulation along hopped carriers in frequency-selective fading channels, and on the other circumvents the need for agile frequency synthesizers. A coding strategy has been developed to provide the best error-rate performance under given channel conditions. System design issues are discussed and an example design is presented.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"6 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":"122083609","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
Error-correcting coding for CDMA systems CDMA系统的纠错编码
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379620
A. Viterbi
{"title":"Error-correcting coding for CDMA systems","authors":"A. Viterbi","doi":"10.1109/ISSSTA.1994.379620","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379620","url":null,"abstract":"The preselected title of this paper highlights the misconception that most engineers, sometimes even communication specialists, still harbor concerning the central role of channel coding in communication system performance. More properly descriptive terms are \"error-preventing\", \"error-protecting\", or the more common \"error control.\" The reason is that in modern communication systems, designed according to the norms of information theory, coding is an integral part of the modulation process and the optimum modulator and demodulator combine the coding and modulation, as well as the decoding and demodulation, processes into one function at both the transmitter and the receiver. This viewpoint has become commonplace for modulation systems which operate in additive Gaussian noise, with relatively high signal-to-noise ratios, at bit rates considerably greater than their transmission bandwidth. For such systems and channels, the evolution and general acceptance of trellis coded modulation (TCM) has demonstrated how modulation and channel coding can be integrated to provide superior performance.<<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":"123912587","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
Self-noise as a factor limiting the dynamic range in impulse response measurements using sliding correlation 自噪声作为限制滑动相关脉冲响应测量动态范围的因素
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379511
J. Talvitie, T. Poutanen
{"title":"Self-noise as a factor limiting the dynamic range in impulse response measurements using sliding correlation","authors":"J. Talvitie, T. Poutanen","doi":"10.1109/ISSSTA.1994.379511","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379511","url":null,"abstract":"A simple analysis leading to expressions for the multiplier output spectrum and the effective probing signal of an impulse response measurement system using sliding correlation is presented. Evaluation of the expressions shows the presence of self-noise at the correlator output and its dependence on the system parameters. The dynamic range of the measurement can be studied using the expressions derived. The incorporation of different correlation filter characteristics in the expressions for the effective probing signal is easily achieved.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"338 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":"122835509","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
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