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1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)最新文献

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A rate-adaptive coded OFDM (RA-OFDM) spread spectrum system for tactical radio networks 一种用于战术无线电网络的速率自适应编码OFDM (RA-OFDM)扩频系统
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790239
Zhong Ye, G. Saulnier, D. Lee, M. Medley
{"title":"A rate-adaptive coded OFDM (RA-OFDM) spread spectrum system for tactical radio networks","authors":"Zhong Ye, G. Saulnier, D. Lee, M. Medley","doi":"10.1109/CTMC.1999.790239","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790239","url":null,"abstract":"This paper investigates the use of spread spectrum OFDM modulation to provide a variable rate communications link that is tolerant of multipath fading and interference. The system adaptively varies to changing channel conditions in a way that optimizes throughput while maintaining acceptable error rate performance. System performance for a variety of channel conditions including AWGN, static multipath, time-varying frequency selective and frequency non-selective Rayleigh fading shows that a desired BER can be maintained through adjustment of the processing gain. A trade-off analysis between forward error correction (FEC) coding and spreading shows that a coding rate of approximately 1/2 is best, with the remainder of the bandwidth expansion used for spreading. An overall system adaptation strategy in a broad range of channel conditions is presented.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116864251","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
Convergence and stability analysis of the adaptive "Bootstrap" CDMA multi-user detector 自适应“自举”CDMA多用户检测器的收敛性与稳定性分析
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790258
Cheng-Chou Lee, Y. Bar-Ness
{"title":"Convergence and stability analysis of the adaptive \"Bootstrap\" CDMA multi-user detector","authors":"Cheng-Chou Lee, Y. Bar-Ness","doi":"10.1109/CTMC.1999.790258","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790258","url":null,"abstract":"The \"Bootstrap\" algorithm provides an efficient adaptive mult-user detection approach to solve the near-far problem in CDMA communication systems. The weight vectors are controlled by a simple decorrelation scheme which minimizes the correlation between their outputs and the hard limited version of the other outputs, respectively. It has been shown that the \"Bootstrap\" algorithm provides performance similar to that of MMSE with low complexity. In this article, the convergence and stability of the \"Bootstrap\" algorithm is considered. Sufficient conditions for the code cross-correlation and the step size are provided.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123772571","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
On the design of binary serially concatenated convolutional codes 二进制串接卷积码的设计
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790232
S. Benedetto, L. Gaggero, R. Garello, G. Monorsi
{"title":"On the design of binary serially concatenated convolutional codes","authors":"S. Benedetto, L. Gaggero, R. Garello, G. Monorsi","doi":"10.1109/CTMC.1999.790232","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790232","url":null,"abstract":"The serial concatenation of simple binary convolutional codes through an interleaver is a technique that yields, through iterative decoding, performance similar to, and in some cases better than, those of turbo codes (parallel concatenated convolutional codes). The design of serially concatenated codes with short and medium interleavers is considered in this paper; comparisons between union bounds, maximum-likelihood sequence decoding and iterative decoding are presented. An example of code and interleaver optimization is reported. An alternative scheme to current GSM standard channel coding is also analysed.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129095898","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
Selection of the most "efficient" Reed-Solomon code for a specific application using neural networks 为使用神经网络的特定应用程序选择最“有效”的里德-所罗门代码
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790237
H. Benjamin, B. Kamali
{"title":"Selection of the most \"efficient\" Reed-Solomon code for a specific application using neural networks","authors":"H. Benjamin, B. Kamali","doi":"10.1109/CTMC.1999.790237","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790237","url":null,"abstract":"Reed-Solomon (RS) codes have found a widespread applications in digital communications and digital recording systems in the past two decades. The catalog of Reed-Solomon is a rather long one. To select a proper code for a given application, the system designer is compelled to deal with numerous tables, graphs and equations. We introduce a novel application of artificial neural networks (NN) in selecting the most \"efficient\" RS code for a specific design scenario. It is shown that 98.04% of the time the NN makes correct selections.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"15 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114031165","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
Joint phase and timing synchronization algorithms for MSK-type signals msk型信号的相位和时序联合同步算法
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790254
M. Morelli, G. Vitetta
{"title":"Joint phase and timing synchronization algorithms for MSK-type signals","authors":"M. Morelli, G. Vitetta","doi":"10.1109/CTMC.1999.790254","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790254","url":null,"abstract":"Novel non data-aided (NDA) algorithms are proposed for joint estimation of timing and carrier phase in MSK-type modulations. They are based on maximum likelihood methods and have a feedforward structure which is suitable for fully digital implementation. Performance with MSK and Gaussian MSK (GMSK) is assessed by computer simulations and compared with that of other existing estimation schemes.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134398887","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
Adaptive sequence detection using T-algorithm for multipath fading ISI channels 基于t算法的多径ISI信道自适应序列检测
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790250
Heung-no Lee, G. Pottie
{"title":"Adaptive sequence detection using T-algorithm for multipath fading ISI channels","authors":"Heung-no Lee, G. Pottie","doi":"10.1109/CTMC.1999.790250","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790250","url":null,"abstract":"We develop an adaptive, low complexity tree-search receiver using the T-algorithm for multipath fading ISI channels. Unlike previous research on sequence based detection, a symbol spaced channel is not given a a priori, rather the receiver utilizes the feedforward channel estimation to derive the matched filter and the symbol-spaced statistics. Then, to enhance the efficiency of the T-algorithm, the use of a mean-square whitening filter (MS-WF) is proposed. We also propose the use of per-survivor processing which brings a further SNR advantage and reduction of the average computations required by the T-algorithm receiver. A substantial SNR benefit over a correct decision feedback equaliser (DFE) is achieved at a moderate increase in complexity.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117302780","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
Capacity of time-varying channels with channel side information at the sender and receiver 发送端和接收端具有信道侧信息的时变信道的容量
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790229
M. Médard, A. Goldsmith
{"title":"Capacity of time-varying channels with channel side information at the sender and receiver","authors":"M. Médard, A. Goldsmith","doi":"10.1109/CTMC.1999.790229","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790229","url":null,"abstract":"The capacity of time-varying asymptotically block memoryless channels with causal channel side information at the sender and receiver is considered. We present a formal weak coding theorem and its converse. We then show that our coding theorem can be used to obtain the capacity of time-varying ISI channels, which cannot generally be considered using traditional decomposition methods. For perfect instantaneous side information, the form of the input distribution that maximizes capacity is found to be conditional Gaussian. We also consider the capacity of flat fading channels with imperfect channel estimates.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114450554","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
Performance bounds of non-uniform signaling over AWGN channels AWGN信道上非均匀信令的性能界限
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790244
Hongyan Kuai, F. Alajaji, G. Takahara
{"title":"Performance bounds of non-uniform signaling over AWGN channels","authors":"Hongyan Kuai, F. Alajaji, G. Takahara","doi":"10.1109/CTMC.1999.790244","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790244","url":null,"abstract":"We present two bounds (one lower bound and one upper bound) on the probability of a union of a finite number of events. The bounds-which are expressed in terms of only the individual event probabilities and the pairwise event probabilities-are applied to examine the symbol error (P/sub s/) and bit error (P/sub b/) probabilities of an uncoded communication system used in conjunction with M-ary PSK/QAM modulations and maximum a posteriori (MAP) decoding over AWGN channels. It is shown that both bounds provide a good, and often excellent, estimate of the error probabilities over the entire range of the signal-to-noise ratio E/sub b//N/sub 0/. The upper bound on P/sub s/ and the lower bound on P/sub b/ are particularly impressive as they agree with the simulation results even during very severe channel conditions.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128945516","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
Combined blind equalization and turbo decoding 结合盲均衡和turbo解码
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790236
J. Garcia-Frías, J. Villasenor
{"title":"Combined blind equalization and turbo decoding","authors":"J. Garcia-Frías, J. Villasenor","doi":"10.1109/CTMC.1999.790236","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790236","url":null,"abstract":"We describe parallel concatenated codes for communication in the presence of intersymbol interference (ISI). Two iterative decoder structures which combine channel equalization and turbo decoding are presented. The first one combines the trellis representing each one of the constituent encoders with the ISI trellis and performs slightly better that the second structure, which treats the ISI as another constituent decoder. We show that for both methods it is possible to perform the equalization blindly, since the parameters of the channel can be estimated jointly with the combined turbo decoding/equalization algorithm. These methods involve little or no sacrifice in performance relative to the case where the channel taps are known by the receiver.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131966163","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
BER performance of multicarrier DS-CDMA systems over generalized fading channels 广义衰落信道下多载波DS-CDMA系统的误码率性能
1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352) Pub Date : 1999-06-06 DOI: 10.1109/CTMC.1999.790240
M. Simon, Mohamed-Slim Alouini
{"title":"BER performance of multicarrier DS-CDMA systems over generalized fading channels","authors":"M. Simon, Mohamed-Slim Alouini","doi":"10.1109/CTMC.1999.790240","DOIUrl":"https://doi.org/10.1109/CTMC.1999.790240","url":null,"abstract":"We study the performance of a multicarrier DS-CDMA system proposed by Kondo and Milstein (see IEEE Trans. Commun., vol.COM-44, p.238-46, 1996) when the various subbands undergo a generalized type of fading. We consider the average bit-error-rate of such systems in the absence and in the presence of partial band interference, and compare the results with that of a single carrier RAKE system. The final expressions are expressed in a simple form which can be readily computed numerically and offer therefore a useful analytical tool for the accurate performance evaluation of various systems operating in a wide range of fading environments. The mathematical formalism is illustrated by applying the analysis to the performance of a multicarrier DS-CDMA system over Nakagami-m fading. Numerical results confirm that multicarrier systems outperform single carrier ones in the presence of strong interference. Furthermore, the relative difference between the two systems tends to increase as the amount of fading decreases.","PeriodicalId":395433,"journal":{"name":"1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352)","volume":"43 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116503983","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
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