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Proceedings of GLOBECOM 1995 Mini最新文献

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Accurate techniques to evaluate CDMA bit error rates in multipath channels with imperfect power control 功率控制不完善的CDMA多径信道误码率的精确评估技术
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502927
J. Liberti, T. Rappaport
{"title":"Accurate techniques to evaluate CDMA bit error rates in multipath channels with imperfect power control","authors":"J. Liberti, T. Rappaport","doi":"10.1109/CTMC.1995.502927","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502927","url":null,"abstract":"In this paper, a simplified expression for the improved Gaussian approximation (SEIGA) is presented for accurately evaluating direct sequence code division multiple access (DS-CDMA) bit error rates in multipath channels and systems with imperfect power control. Previous techniques for evaluating bit error rate performance of these systems can lead to overly optimistic results under a variety of conditions, particularly when directional or adaptive antennas are used at the base station. In this paper, we demonstrate the accuracy of these new techniques for evaluating bit error rates in both narrowband and wideband multipath channels and illustrate these techniques by providing a system example in which adaptive antennas are applied to CDMA cellular radio systems.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"357 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133319570","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: 22
Proposal of a novel signal separation principle based on DFT with extended frame Fourier analysis 基于扩展帧傅里叶分析的DFT信号分离原理的提出
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502942
N. Kuroyanagi, Lili Guo, N. Suehiro
{"title":"Proposal of a novel signal separation principle based on DFT with extended frame Fourier analysis","authors":"N. Kuroyanagi, Lili Guo, N. Suehiro","doi":"10.1109/CTMC.1995.502942","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502942","url":null,"abstract":"An analytical principle for a time limited signal is made by introducing the extended frame concept into DFT (discrete Fourier transform). Waveform analysis more accurate than DFT is achieved by calculating correlation between the input frame signal with an extended frame and the element frequency components corresponding to the extended frame length. It is shown that this method contributes to enhancing functions such as precise filtering, signal separation, or noise suppression. The improvement of signal to noise ratio for FSK/PSK data transmission is estimated, compared to the performance with conventional matched filter detection.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125959503","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
Internetworking using interframe source correlation 使用帧间源相关的互连网络
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502937
Ernest L. WalkerzyDepartment
{"title":"Internetworking using interframe source correlation","authors":"Ernest L. WalkerzyDepartment","doi":"10.1109/CTMC.1995.502937","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502937","url":null,"abstract":"A new packet forwarding scheme for (LAN) internetworking devices is proposed to take advantage of temporal locality in the network traffic. This scheme exploits the correlated nature of frame arrivals and makes forwarding decisions based on the time gap between arriving and departing frames. A theoretical model is developed for expressing the temporal locality in the network traffic. A queueing network model is developed for a medium access control (MAC) layer bridge implementation of the proposed scheme. A performance comparison is made between the proposed and conventional schemes using average throughput and average transfer delay as overall performance measures. Poisson arrivals are used to establish a lower bound on the performance improvement between the two schemes. The theoretical and simulation model results are in agreement over the region of operational interest.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129962299","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 effect of mobile speed on the forward link of the DS-CDMA cellular system 移动速度对DS-CDMA蜂窝系统前向链路的影响
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502949
V. Weerackody
{"title":"The effect of mobile speed on the forward link of the DS-CDMA cellular system","authors":"V. Weerackody","doi":"10.1109/CTMC.1995.502949","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502949","url":null,"abstract":"A direct-sequences code division multiple access system has been accepted as a digital cellular standard (IS-95) in North America. This digital cellular standard employs a powerful rate 1/2, constraint length 9, convolutional code in its forward link. It is well-known that in a Rayleigh fading channel the performance of a channel code depends very heavily on the interleaving depth and the relative variations of the channel characteristics. In slow fading channels, since the input symbols to the channel decoder are highly correlated, the bit-error-rate at the output of the channel decoder may be unacceptably high. Interleavers of large dimensions can reduce the correlation of the input signal to the channel decoder at the expense of an intolerable delay. In this paper we examine the performance of the IS-95 system, at the mobile receiver, for different channel fade rates.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123962380","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
Tight bounds on the bit error probabilities of MDPSK over the nonselective Rician fading channel 非选择性衰落信道上MDPSK误码概率的紧界
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502932
P. Kam, C. Zhong
{"title":"Tight bounds on the bit error probabilities of MDPSK over the nonselective Rician fading channel","authors":"P. Kam, C. Zhong","doi":"10.1109/CTMC.1995.502932","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502932","url":null,"abstract":"The bit error probabilities of BDPSK and QDPSK over the Gaussian channel with nonselective Rician fading are studied using the bounds obtained by Kam (see IEEE Trans. Commun., vol.COM-42, no.12, p.3119, 1994). These bounds are shown to coincide with the exact error probability results in the former binary case, and to provide very accurate estimates of the bit error probability in the latter quadriphase case, especially in the limit of high SNR and in the limit of small K- factor. The bounds provide a simple analytical handle by which one can study the behavior of the error probability as a function of various quantities such as the Doppler spectrum, the Doppler bandwidth and the K-factor. New results are obtained, in particular, for the irreducible error rate floor and the SNR at which this error floor sets in. The results are useful to the design of the new generations of digital mobile radio communication systems.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129762297","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 reduced-complexity formulation for DS-SSMA performance evaluation via the characteristic function method 一种基于特征函数法的DS-SSMA性能评估简化公式
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502956
D. Liu, C. Despins
{"title":"A reduced-complexity formulation for DS-SSMA performance evaluation via the characteristic function method","authors":"D. Liu, C. Despins","doi":"10.1109/CTMC.1995.502956","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502956","url":null,"abstract":"A significant body of literature has been devoted to the evaluation of error probabilities for direct sequence spread spectrum multiple access (DS-SSMA) systems. This paper presents a reduced-complexity formulation for such a performance evaluation via the characteristic function method which is a powerful tool for accurate evaluation of DS-SSMA performance and does not require a large number of moments of the decision statistic. In the previous version of this technique, the characteristic function of the multiple access interference (MAI) component of the decision statistic (for a correlation receiver) was expressed in terms of a double integral over the distributions of phase and delay. The new formulation generates a more compact expression for the characteristic function of the MAI, eliminates the need for numerical integration over the phase distribution (thus improving the accuracy) and yields a computational complexity reduction proportional to the product of the spreading gain and the number of terms required to integrate over the phase distribution. This renders the characteristic function method more attractive for application to future wideband CDMA systems and by extension, to more complex transceiver structures and time-varying channels.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127280351","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
Construction of uniform error property codes for generalized decoding 通用译码中统一错误属性码的构造
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502923
D. Raphaeli
{"title":"Construction of uniform error property codes for generalized decoding","authors":"D. Raphaeli","doi":"10.1109/CTMC.1995.502923","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502923","url":null,"abstract":"We consider the general problem of the uniform error property (UEP) for multidimensional coded modulation, transmitted over the AWGN or flat fading channel and received by a generalized decoder. The symbols are restricted to have constant energy. The generalized decoder is a very broad range model for the decoders and receivers which are used in current and proposed communication systems. It operates by maximizing an arbitrary likelihood function the arguments of which are the front-end correlator outputs. The coherent decoder for the AWGN is only a special case. A group code structure which guarantees the UEP is obtained by extending the theory of geometrically uniform codes to the generalized decoder. A discussion on the particular case of noncoherent decoding is presented. It is found that the correlation-based decoder error probability is a function of a pseudo-distance.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133643704","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
Blind real-time low-complexity receivers for DS-CDMA mobile users 用于DS-CDMA移动用户的盲实时低复杂度接收机
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502944
S. Batalama, D. Pados
{"title":"Blind real-time low-complexity receivers for DS-CDMA mobile users","authors":"S. Batalama, D. Pados","doi":"10.1109/CTMC.1995.502944","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502944","url":null,"abstract":"A new blind linear-filter receiver is proposed for the detection of DS-CDMA users in unknown multi-user interference and additive white Gaussian noise. The proposed receiver is motivated by the Wiener reconstruction-filter theory and it is a minimum-variance-distortionless-response-type filter that maximizes the output signal-to-interference-plus-noise-ratio. The receiver is randomized with input driven realizations and parametrized with respect to only a single scalar parameter. The batch solution for the single scalar tuning parameter is simple and requires no matrix inversion, while adaptive alternatives are fast, low-complexity, strongly consistent stochastic approximation recursions on R.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"8 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114117810","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
Time-domain equalization for multicarrier communication 多载波通信的时域均衡
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502953
Mark Van Blade, M. Moeneclaey
{"title":"Time-domain equalization for multicarrier communication","authors":"Mark Van Blade, M. Moeneclaey","doi":"10.1109/CTMC.1995.502953","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502953","url":null,"abstract":"Multicarrier communication, without time-domain equalizer (TEQ), over a channel whose impulse response duration is of the same order as the inverse carrier spacing, requires a long guard interval yielding a considerable loss in both power and bandwidth efficiency. A smaller guard interval (yielding a smaller loss) can be allowed when using at the receiver a TEQ that shortens the impulse response of the cascade of channel plus TEQ. In this contribution the impulse response of a FIR TEQ is determined according to a MMSE criterion, resulting in an eigenvalue problem. Numerical performance results as a function of TEQ complexity are presented, assuming both upstream and downstream asymmetric digital subscriber line (ADSL) communication over twisted pair cable.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122865671","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: 46
A wide-band impulse-noise survey on subscriber lines and inter-office trunks - Modeling and simulation 用户线路和局间中继的宽带脉冲噪声调查。建模和仿真
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502936
W. Henkel, T. Kessler, H. Chung
{"title":"A wide-band impulse-noise survey on subscriber lines and inter-office trunks - Modeling and simulation","authors":"W. Henkel, T. Kessler, H. Chung","doi":"10.1109/CTMC.1995.502936","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502936","url":null,"abstract":"Alternatives of a simulation model for impulse noise on subscriber lines are proposed and their statistical properties are outlined. Several pseudo-noise generators are combined with spectral shaping operations to approximate the desired statistics of the non-stationary disturbance. Although the considerations are based on the special statistical properties of impulse noise, the applied methods may as well be applicable to other modeling purposes. Especially, a proposal that allows to generate samples that fulfill the required amplitude statistics and bring forth a prescribed power density spectrum may be suitable elsewhere, too.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130074967","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
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