Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)最新文献_第10页

Interference suppression for CDMA overlays of narrowband waveforms CDMA窄带波形叠加的干扰抑制

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379615

L. Milstein, Jiangzhou Wang

引用次数: 17

Performance of cellular SSMA with block coding under fading and multipath conditions 衰落和多径条件下分组编码的蜂窝SSMA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.1994.379581

P. van Rooyen, J. Kunicki, R. Pichna

{"title":"Performance of cellular SSMA with block coding under fading and multipath conditions","authors":"P. van Rooyen, J. Kunicki, R. Pichna","doi":"10.1109/ISSSTA.1994.379581","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379581","url":null,"abstract":"Considers the application of channel coding to cellular DS-SSMA digital radio. The method of moments is used to accurately assess the system error probability. Using this technique, one can also assess the accuracy of assuming that the multiuser interference has a Gaussian distribution, which allows calculations to be analyzed by simpler means. It is verified that the Gaussian assumption is sufficiently accurate under the conditions considered. Cellular system performance is further investigated with voice activity monitoring and cell splitting under AWGN, Rayleigh fading and multipath conditions typical for personal and mobile communications. Block codes of relative low complexity are investigated when Gold sequences of length 255 and 127 are employed for purposes of PN spreading. The average degradation due to interuser interference is determined by employing exact aperiodic correlation parameters as defined by Pursely [1977]. Numerical results indicate that for a given processing gain and number of interfering users, appropriate coding can allow for reliable communication even under multipath fading conditions.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"54 18","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120882621","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

A novel, on-board satellite spread spectrum correlator 一种新型星载扩频相关器

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379563

A. Jenkins, A. M. Street, S. Morley, C. Grovenor, D. Dew-Hughes, D. Edwards

{"title":"A novel, on-board satellite spread spectrum correlator","authors":"A. Jenkins, A. M. Street, S. Morley, C. Grovenor, D. Dew-Hughes, D. Edwards","doi":"10.1109/ISSSTA.1994.379563","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379563","url":null,"abstract":"Currently, there is much research activity in the area of satellite on-board signal processing. This interest stems from the potential to use the space segment as more than just a transponder. On-board processing would improve the overall link budget and allow such features as signal re-routing to be exploited. Typically, most multiple access schemes to the satellite use either time or frequency division techniques. However, spread spectrum multiple access techniques are gaining in popularity and can, in certain instances, provide a viable alternative to the above methods. As with any spread spectrum system, the implementation of the correlator dictates, to an extent, the overall system performance. This paper describes a novel implementation of the correlation function which would be suited to space payloads and in addition considers the various design constraints and benefits. It then reports on the experimental results obtained using a prototype device operating in the C-band region with a spreading code rate of up to 500 Mbit/s. Implementation of the design in high temperature superconducting (HTS) technology is then discussed and results for an HTS delay line fabricated on a 50 mm diameter wafer presented.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"41 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":"121737790","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

Bootstrapped decorrelating algorithm for adaptive interference cancelation in synchronous CDMA communications systems 同步CDMA通信系统中自适应干扰消除的自引导去相关算法

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379603

Y. Bar-Ness, Z. Siveski, D. W. Chen

{"title":"Bootstrapped decorrelating algorithm for adaptive interference cancelation in synchronous CDMA communications systems","authors":"Y. Bar-Ness, Z. Siveski, D. W. Chen","doi":"10.1109/ISSSTA.1994.379603","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379603","url":null,"abstract":"A code division multiple access detector that employs a combination of a correlation detector and a multiuser adaptive interference canceler was previously proposed by the authors. The weights of the canceler are adaptively controlled by the steepest descent algorithm using the minimum power criterion of the canceler outputs. It was shown that such a canceler substantially outperforms the decorrelating detector and has almost the same error probability as a canceler that uses reliable estimates of the received signal energies. In this paper, a different weight control criterion based on minimizing the correlation between the signals at the outputs of the canceler is used, and its performance is compared to that obtained with the minimum power criterion. It is shown that both cancelers have almost the same performance, particularly when SNR is modestly high. Although it is not shown in this paper, we believe that minimizing correlation rather than power outputs is a more suitable criterion when dealing with highly dispersive channels.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"92 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":"124706918","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: 13

Investigations on the time variations of the wide-band radio channel for random receiver movements 随机接收机移动时宽带无线电信道时变研究

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379509

B. Fleury, D. Dahlhaus

引用次数: 17

Standardization in a wireless environment 无线环境中的标准化

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379612

D. Schilling, J. Taylor, J. Garodnick

引用次数: 0

Multi-media integration in CDMA networks CDMA网络中的多媒体集成

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379611

E. Geraniotis, Y. Chang, W.‐B. Yang

{"title":"Multi-media integration in CDMA networks","authors":"E. Geraniotis, Y. Chang, W.‐B. Yang","doi":"10.1109/ISSSTA.1994.379611","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379611","url":null,"abstract":"In the context of deriving schemes for efficient use of the spectrum by multi-media users in direct-sequence code-division multiple-access (DS/CDMA) networks we describe an optimal policy for CDMA code allocation to voice and multi-priority data traffic. We consider CDMA networks with voice traffic and two types of data traffic: high priority data traffic with the same priority as voice traffic that requires real-time delivery and lower priority data traffic that can tolerate delay and thus can be queued. A movable boundary policy in the CDMA code domain is used for the voice and high priority data, whereas a small number of CDMA codes are reserved for the lower priority data which also utilizes any CDMA codes left unused by the other two traffic types. The optimal policy is obtained by minimizing a cost function consisting of the weighted sum of the rejection rates of voice and high priority data traffic subject to performance requirements (bit error rates or BER) on all traffic types. The queueing delay of the lower priority data traffic is also evaluated. A semi-Markov decision process (SMDP) with guaranteed BERs for voice and data traffic is used for formulating the dynamic code assignment problem. A value-iteration algorithm is applied to this SMDP to derive the optimal policy.<<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":"134460975","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

On multiple access interference in a DS/FFH spread spectrum communication system DS/FFH扩频通信系统中的多址干扰研究

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379590

J. Glas

引用次数: 13

Modeling and performance evaluation of different CDMA schemes for terrestrial and satellite communication systems 地面和卫星通信系统中不同CDMA方案的建模与性能评价

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379567

E. D. Re, Romano Fantacci, A. Pazzaglia

引用次数: 1

A channel access protocol for multihop FH-SS packet radio networks 多跳FH-SS分组无线网的信道接入协议

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379589

C. Pomalaza-ráez

引用次数: 0