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Proceedings of GLOBECOM 1995 Mini最新文献

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Systematic trellis-coded modulation with asymmetric constellations 不对称星座的系统栅格编码调制
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502922
G. Stuber, E. Katz
{"title":"Systematic trellis-coded modulation with asymmetric constellations","authors":"G. Stuber, E. Katz","doi":"10.1109/CTMC.1995.502922","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502922","url":null,"abstract":"A novel approach to trellis-coded modulation on fading ISI channels is presented. This approach, named systematic trellis-coded modulation (STCM), is suitable for erasure-free reception with sequential decoding in systems that do not use ARQ. The code design principles for STCM are described, along with a systematic detection algorithm, and the structure of a dual-mode receiver for STCM with sequential and systematic detection. Good STCM codes are obtained through computer searches that use both symmetric and asymmetric signal constellations.","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":"129629353","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
A single-chip solution for digital demodulation and forward error correction of DBS signals DBS信号的数字解调和前向纠错的单片解决方案
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502940
S. Raghavan
{"title":"A single-chip solution for digital demodulation and forward error correction of DBS signals","authors":"S. Raghavan","doi":"10.1109/CTMC.1995.502940","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502940","url":null,"abstract":"We present a low-cost single VLSI chip solution for the reception of digitally transmitted compressed video signals. This chip is an integral part of the direct TV direct broadcast satellite (DBS) receiver, and it implements digital demodulation of baseband QPSK signals, and forward error correction using the combination of a Viterbi decoder and a Reed-Solomon decoder. Innovative digital signal processing algorithms were implemented to obtain excellent performance (<0.5 dB from theory) at a low cost.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"160 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":"131106876","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
Frame error rates for convolutional codes on fading channels and the concept of effective E/sub b//N/sub 0/ 衰落信道下卷积码的帧误码率及有效E/sub / b//N/sub 0/的概念
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502926
Sanjiv Nanda, K. Rege
{"title":"Frame error rates for convolutional codes on fading channels and the concept of effective E/sub b//N/sub 0/","authors":"Sanjiv Nanda, K. Rege","doi":"10.1109/CTMC.1995.502926","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502926","url":null,"abstract":"We consider the estimation of Viterbi decoder performance for convolutional codes with interleaving over fading channels subject to practical power control algorithms. Given a received vector of (time-varying) E/sub b//N/sub 0/ values for a frame, we compute the error probability and effective E/sub b//N/sub 0/ for that frame, where the latter is defined as the E/sub b//N/sub 0/ on an AWGN channel that results in the same frame error rate. We validate our analysis using the R=1/3 convolutional code and interleaver used on the IS-95 CDMA reverse channel.","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":"124504515","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: 75
Design and characterisation of partial response decision feedback equaliser 部分响应决策反馈均衡器的设计与表征
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502952
P. H. Seah, M. Gurcan
{"title":"Design and characterisation of partial response decision feedback equaliser","authors":"P. H. Seah, M. Gurcan","doi":"10.1109/CTMC.1995.502952","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502952","url":null,"abstract":"The partial response decision feedback equaliser (DFE) solution is derived by applying Wiener filter theory and the principle of orthogonality to obtain novel expressions for the optimum filter tap weights and the minimum mean square error (MSE). The effective filter lengths for the DFE are determined. The theoretical derivations are verified by simulations. The characteristics of optimum MSE behaviour under varying DFE parameters (channel filter, modulation filter, FFF length, detection delay, FBF length and channel noise) for different modulation signals are studied using simulations and some guidelines for effective DFE design are proposed.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"16 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":"126603923","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
Vector quantization over a CDMA channel using soft multiuser decoding 矢量量化在CDMA信道上使用软多用户解码
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502943
M. Skoglund, T. Ottosson
{"title":"Vector quantization over a CDMA channel using soft multiuser decoding","authors":"M. Skoglund, T. Ottosson","doi":"10.1109/CTMC.1995.502943","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502943","url":null,"abstract":"The optimal soft decoder for vector quantization over a CDMA channel is presented. It utilizes a-priori source information and channel characteristics to combat channel noise and multiuser interference. Versions of the optimal decoder with lower complexity are also considered. Simulations demonstrate that the soft decoder outperforms the scheme that uses ML-detection plus table look-up VQ decoding.","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":"122037057","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
A decentralised channel control method for grouped ALOHA systems and drift analysis 分组ALOHA系统的分散信道控制方法及漂移分析
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502931
Q. Cuo, M. K. Gurean
{"title":"A decentralised channel control method for grouped ALOHA systems and drift analysis","authors":"Q. Cuo, M. K. Gurean","doi":"10.1109/CTMC.1995.502931","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502931","url":null,"abstract":"The paper considers a recursive method for each individual user to decide the re-transmission probability to improve channel utilisation for a grouped slotted ALOHA system in the delayed first transmission (DFT) mode. In this system all the users are divided into two groups according to the signal power. The paper assumes that the total channel traffic can be formulated as a Poisson stream and each user has a counter to update an estimate of the number of backlogged users in each group according to a quadruple feedback information provided about the information received during the current slot by the base station. This information is immediately available to each user in both groups. It is shown that the optimal channel utilisation which maximises the total channel throughput can be obtained if each individual user re-transmits packets with the probability identified by this paper. A heuristic analysis for the chain drift is presented to examine the system control parameter. The simulation results show that the proposed system provides improved throughput.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"10 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":"125480044","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
Pilot symbol initiated optimal decoder for the land mobile fading channel 导频符号启动陆地移动衰落信道的最优解码器
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502929
J. Han, C. Georghiades
{"title":"Pilot symbol initiated optimal decoder for the land mobile fading channel","authors":"J. Han, C. Georghiades","doi":"10.1109/CTMC.1995.502929","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502929","url":null,"abstract":"We investigate the use of the expectation-maximization (EM) algorithm for estimating sequences of two-dimensional constellation signals transmitted over Gaussian fading channels with diversity reception. The algorithm performs coherent decoding with the use of pilot symbols. It is shown that the performance of the algorithm approaches that of the optimal maximum-likelihood (ML) receiver with linearly increasing complexity as a function of the sequence length. The uncoded performance as well as the coded performance are simulated, and compared with that of other algorithms.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"36 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":"126879458","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
Extended MLSE receiver for the frequency-flat, fast fading channel and linear modulations 扩展MLSE接收机的频率平坦，快速衰落信道和线性调制
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502951
Brian Hart, D. Taylor
{"title":"Extended MLSE receiver for the frequency-flat, fast fading channel and linear modulations","authors":"Brian Hart, D. Taylor","doi":"10.1109/CTMC.1995.502951","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502951","url":null,"abstract":"This paper develops an MLSE receiver for the frequency-flat, fast fading channel corrupted by additive Gaussian noise, when linear modulations (M-ASK, M-PSK, M-QAM) are employed. The paper extends Ungerboeck's derivation of the extended MLSE receiver for the purely frequency-selective channel to the time-selective channel. Although the new receiver's structure and metric assume ideal channel state information (CSI), the receiver can be used wherever high-quality CSI is available. The receiver is maximum likelihood for a variety of channels, including Rician, Rayleigh, log-normal and AWGN channels. Bounds on the receiver's BER are deduced for ideal CSI and fast Rayleigh fading. The paper offers insight into matched filtering and receiver processing for the fast fading channel. The new receiver can seamlessly tolerate square-root Nyquist pulses without a fading-induced ISI error floor.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"34 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":"123948826","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
Optimal versus PSP-based sequence detection for Rayleigh fading channels 瑞利衰落信道的最优与基于psp的序列检测
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502934
P. Castoldi, R. Raheli
{"title":"Optimal versus PSP-based sequence detection for Rayleigh fading channels","authors":"P. Castoldi, R. Raheli","doi":"10.1109/CTMC.1995.502934","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502934","url":null,"abstract":"We investigate maximum likelihood sequence estimation (MLSE) of data sequences transmitted over time-varying frequency-selective Rayleigh fading channels. We present the optimal receiver designed to exploit perfect channel state information (CSI) at the beginning of the data sequence and the optimal receiver which does not use this information. For any given data sequence length a performance range for optimal detection can be identified: this range is lower bounded by the optimal receiver with perfect CSI and upper bounded by that without CSI. For increasing data sequence lengths, this range becomes narrower, since the performance of the two optimal receivers tends to converge to a common level. As a consequence, the performance of the optimal detector can be inferred and compared to that of practical receivers based on per-survivor processing (PSP).","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"2 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":"128148269","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
Generalized Erlang-B formula for mobile and wireless radio channels 移动和无线无线电信道的广义Erlang-B公式
Proceedings of GLOBECOM 1995 Mini Pub Date : 1995-11-13 DOI: 10.1109/CTMC.1995.502928
D. Huo
{"title":"Generalized Erlang-B formula for mobile and wireless radio channels","authors":"D. Huo","doi":"10.1109/CTMC.1995.502928","DOIUrl":"https://doi.org/10.1109/CTMC.1995.502928","url":null,"abstract":"Radio channels in mobile and wireless communication systems are affected adversely by fading and interference. This has the consequence of a reduced channel availability and, hence, a degraded quality of service. From the system point of view, this leads to an increase in traffic that the system has to cope with. The present paper addresses this problem by introducing the term \"virtual traffic\" into the queueing model for the radio channels. By this means the quality of a nondeterministic channel, such as those of mobile and wireless communications, is taken into account. The result leads to a generalization of the Erlang-B formula for channels with nondeterministic quality and, as such, can be used for network design in mobile and wireless communications.","PeriodicalId":278133,"journal":{"name":"Proceedings of GLOBECOM 1995 Mini","volume":"397 2 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":"133509713","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: 10
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