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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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Rapid acquisition schemes for CDMA systems in a multipath delay and fading environment 多径延迟和衰落环境下CDMA系统的快速采集方案
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379516
H. Lan, C. Burkley
{"title":"Rapid acquisition schemes for CDMA systems in a multipath delay and fading environment","authors":"H. Lan, C. Burkley","doi":"10.1109/ISSSTA.1994.379516","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379516","url":null,"abstract":"The speed of acquisition is one of the major factors that limits the performance of CDMA receivers. The search rate of direct sequence acquisition schemes can be significantly increased by replacing the multiply and integrate operation with a passive correlation device such as a matched filter (MF). The problems of acquisition using the matched filter have attracted considerable interest. Many results were derived assuming a single user in a fading and multipath delay mobile environment or multi-users in the additive white Gaussian noise channel. In the present paper a numerical method and computer simulation have been developed to simulate the acquisition. The acquisition performance using a matched filter with different numbers of parallel processors is investigated in the multipath delay and fading channel for a CDMA system. The results show that the acquisition performance is significantly degraded in this channel, even when large values of correlation length, which require fewer parallel processors, are used, The performance of a proposed new channel filter placed before the correlator is examined using a Monte Carlo method. Comparison or results of the performance of the correlator using the matched filter with different numbers of parallel processors, with and without the proposed channel filter, shows that the normalized mean acquisition time can be reduced by a factor of 10 when the new channel filter is used.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"104 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":"114255726","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 of the forward link of a CDMA cellular network CDMA蜂窝网络前向链路的性能
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379592
V. DaSilva, E. Sousa, Vladan M. Jovanovic
{"title":"Performance of the forward link of a CDMA cellular network","authors":"V. DaSilva, E. Sousa, Vladan M. Jovanovic","doi":"10.1109/ISSSTA.1994.379592","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379592","url":null,"abstract":"In this paper we study the performance of a point-to-multipoint CDMA communication system operating in an environment with multipath propagation. Rake receivers are used by the mobile terminals to receive the multipath signals. Analytical expressions for signal-to-noise ratios (SNR) are derived for both orthogonal and non-orthogonal spreading sequences. Analytical results are obtained assuming signal paths have amplitudes that are Rayleigh distributed. Also, multipath delay profile measurements, made in the Toronto area, are used to study how the SNR varies in urban and suburban environments.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"76 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":"122598920","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
Use of spread spectrum technique for automotive multiplexing systems 扩频技术在汽车多路复用系统中的应用
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379575
F. Nouvel, G. El Zein, J. Citerne
{"title":"Use of spread spectrum technique for automotive multiplexing systems","authors":"F. Nouvel, G. El Zein, J. Citerne","doi":"10.1109/ISSSTA.1994.379575","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379575","url":null,"abstract":"This paper proposes a multiple access communication network for automobile electronics using the spread spectrum (SS) code division multiple access technique (CDMA) over electrical power lines. Basic principles and advantages to set up the system in a vehicle are presented. Design of this communication system is given, taking in account the variety of interferers and hostile channel properties, such as time-variant attenuation.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"32 2 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":"132301157","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 analysis of mobile positioning using existing CDMA network 基于现有CDMA网络的移动定位性能分析
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379597
E. Hepsaydir, W. Yates
{"title":"Performance analysis of mobile positioning using existing CDMA network","authors":"E. Hepsaydir, W. Yates","doi":"10.1109/ISSSTA.1994.379597","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379597","url":null,"abstract":"Using spread spectrum signals transmitted from each cell in the CDMA network it is possible to estimate a mobile's location. This location information may be used for directing users to a required destination. Possible uses are emergency calls and fleet management. The performance of a mobile positioning application using the CDMA (code division multiple access) network is investigated through the use of simulation. A CDMA network was first proposed by QUALCOMM and performance tests have been successful. As an additional feature, mobile positioning can be applied to the network at no major hardware cost.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"32 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":"134310009","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
Carrier frequency offset-spread spectrum multiple access (CFO-SSMA) method 载波频偏-扩频多址(CFO-SSMA)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.1994.379571
M. Sumiya, H. Shinonaga
{"title":"Carrier frequency offset-spread spectrum multiple access (CFO-SSMA) method","authors":"M. Sumiya, H. Shinonaga","doi":"10.1109/ISSSTA.1994.379571","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379571","url":null,"abstract":"A novel spread spectrum multiple access method employing only a single PN code is proposed. This new method, named \"CFO-SSMA (carrier frequency offset-spread spectrum multiple access)\", utilizes a single PN code commonly assigned to all users with different carrier frequencies. The amount of the frequency offset between carriers is determined by the information rate, which is very small as compared with the bandwidth of the spread spectrum signal. CFO-SSMA employs a receiver using a surface acoustic wave (SAW) matched filter, which has an advantage of rapid signal acquisition over the conventional receiver, but has a disadvantage of difficulty to change the PN code pattern. CFO-SSMA defeats this disadvantage, because there is no need to change the matched filer in accordance with the channel to be recovered. The concept and basic performance of CFO-SSMA is discussed in this paper. The optimum bandwidth of the receive filter as well as the BER performance of CFO-SSMA are also shown.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"75 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":"130350232","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
Auto- and crosscorrelation properties for extended m-sequences and related sequences 扩展m序列和相关序列的自相关和互相关性质
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379554
U. Fiebig
{"title":"Auto- and crosscorrelation properties for extended m-sequences and related sequences","authors":"U. Fiebig","doi":"10.1109/ISSSTA.1994.379554","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379554","url":null,"abstract":"Sequences from the well-known linear PN-sequence families like m-sequences or Gold-codes all have periods 2/sup n/-1, n integer. These sequences provide good auto- and/or crosscorrelation properties whereas-in some cases-they do not fit system clock requirements in that their period is not equal to 2/sup n/ but smaller by one. Thus, it might be advantageous to increase the period of the above mentioned sequences by one yielding extended sequences with period 2/sup n/. In the article extended m-sequences and sequences obtained from extended m-sequences are investigated and compared to m-sequences and Gold-codes. The even auto- and crosscorrelation functions are evaluated.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"30 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":"124806192","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: 15
Bearing estimation techniques for improved reception of spread spectrum signals 改进扩频信号接收的方位估计技术
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379526
J. Thompson, B. Mulgrew, P. Grant
{"title":"Bearing estimation techniques for improved reception of spread spectrum signals","authors":"J. Thompson, B. Mulgrew, P. Grant","doi":"10.1109/ISSSTA.1994.379526","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379526","url":null,"abstract":"The novel use of bearing estimation techniques to determine the direction of arrival of direct sequence spread spectrum signals is described. Firstly, the basic ideas behind bearing estimation are discussed and it is shown how these may be best applied to a spread spectrum receiver array. Then, some simple algorithms are compared and it is shown that the multiple signal classification algorithm (MUSIC) provides good angular resolution for a fixed computational overhead. One major shortcoming of the MUSIC algorithm is that it fails in the presence of coherent spread spectrum multipath returns. Spatial smoothing algorithms are shown to be a solution to this problem and the behaviour of such techniques is discussed.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"115 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":"116456281","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
Countermeasure against SSMA near-far problem using unknown sequence estimator 基于未知序列估计的SSMA近远问题对策
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379602
M. Okubo, M. Nakagawa
{"title":"Countermeasure against SSMA near-far problem using unknown sequence estimator","authors":"M. Okubo, M. Nakagawa","doi":"10.1109/ISSSTA.1994.379602","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379602","url":null,"abstract":"Near-far problem is one of the big problems in direct sequence spread spectrum communications. Conventionally as the countermeasures against near-far problem such methods as transmission power control and crosscorrelation cancellation have been proposed. However, these are not adapted to consumer communications without base stations or concentrated systems. Therefore, we propose an interference cancellation system considering the consumer communications. It can be realized by the estimation of unknown spread sequences of strong interfering signals, making a replica of the interfering signal by using the estimated sequence, and the subtraction of the replica from the received signal.<<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":"126684654","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 new class of polyphase spreading codes for digital pulse compression radar systems 数字脉冲压缩雷达系统中一类新的多相扩频码
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379556
T. Felhauer
{"title":"A new class of polyphase spreading codes for digital pulse compression radar systems","authors":"T. Felhauer","doi":"10.1109/ISSSTA.1994.379556","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379556","url":null,"abstract":"In this paper an algorithm for generating the new class of P(n, k) polyphase codes is presented. The P(n, k) codes are particularly attractive in system employing digital signal processing because when using these codes the favorable correlation properties of typical analogue NLFM signals can be most efficiently combined with the advantages offered by digital signal processing. The significant advantages of the investigated P(n, k) codes over conventional polyphase codes are lower autocorrelation sidelobes and an increased tolerance of Doppler shifts and precompression bandwidths limitations. The primary disadvantage of the P(n, k) codes is a slight loss in range resolution. Results of extensive simulations discussed in this paper show that P(n, k) codes are favorable alternatives to conventional polyphase codes and therefore strongly increase the variety of candidate signals for high resolution wideband channel estimation, for example, encountered in pulse compression radars.<<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":"131029178","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
Frequency and time division duplex techniques for CDMA cellular radio CDMA蜂窝无线电的频率和时分双工技术
Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379572
G.J.R. Povey
{"title":"Frequency and time division duplex techniques for CDMA cellular radio","authors":"G.J.R. Povey","doi":"10.1109/ISSSTA.1994.379572","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379572","url":null,"abstract":"A time division duplex (TDD) technique for use in code division multiple access (CDMA) cellular radio systems is investigated and compared with the performance results for frequency division duplex (FDD) CDMA systems. The TDD base station measures the impulse response of the channel (on the uplink) and uses a matched filter to the channel. It then pre-matches the signal it wishes to transmit on the downlink since its impulse response is identical. This eliminates any channel matched filter operations in the mobile unit and so reduces its complexity, although the base station complexity is increased slightly. Results indicate that FDD techniques provide a higher cell capacity than the equivalent TDD techniques. The advantage of a reduction in mobile station complexity, by using TDD, is offset by the poor error rate and cell capacity performances found for high speed mobile operation.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"23 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":"133333342","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
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