{"title":"Joint channel-data estimation with interference suppression","authors":"S. Diggavi, B. Ng, A. Paulraj","doi":"10.1109/ICC.1998.682898","DOIUrl":"https://doi.org/10.1109/ICC.1998.682898","url":null,"abstract":"This paper describes an adaptive space-time receiver with joint channel and data estimation (JCD) to combat time-varying multipath channels in the presence of undesired co-channel interference (CCI). The receiver uses a colored Gaussian metric in the sequence detection to suppress the CCI. The proposed scheme also uses the knowledge of the transmit filter for improved channel estimation to enhance the performance. We gain insight into the interference suppression scheme through pairwise error-probability analysis. To reduce implementational complexity, a hybrid delayed-decision feedback and JCD scheme is also proposed. The performance is illustrated using numerical results in realistic transmission environments.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115859146","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}
{"title":"Optimization of tap spacings for the tapped delay line decision feedback equaliser","authors":"Inkyu Lee","doi":"10.1109/ICC.1998.682577","DOIUrl":"https://doi.org/10.1109/ICC.1998.682577","url":null,"abstract":"Tap spacings in a tapped delay line equalizer are optimized. We derive a set of nonlinear equations for the optimum tap spacings and tap weights for the decision feedback equalizer. A recursive numerical technique is used to obtain the optimum settings. The nonuniformly spaced tapped delay line equalizer with the optimized tap spacings outperforms the conventional uniformly spaced equalizer with the same number of taps.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"417 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115983496","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}
{"title":"Design and theoretical performance analysis of a hybrid time-hopping/TDMA multiple-access indoor wireless communication system","authors":"K. Kiasaleh","doi":"10.1109/ICC.1998.683095","DOIUrl":"https://doi.org/10.1109/ICC.1998.683095","url":null,"abstract":"A multiple-access (MA) scheme for indoor wireless communications is suggested. The proposed MA scheme takes advantage of time-hopping (TH) within multiple frames of a time-division multiple-access (TDMA) system to provide access to the channel for network subscribers. The assignment codes are those of the {0,1} family codes, previously exploited for fiber-optic code-division multiple-access (FO-CDMA) applications. Upper bounds on the overall symbol error rates for differential phase-shift-keying (DPSK) and frequency-shift-keying (FSK) systems are derived when slow, frequency non-selective Rician fading is present.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"56 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120998227","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}
{"title":"Implementation and performance evaluation of ISAC: integrated services Internet with RSVP over ATM shortcuts","authors":"H. Chow, A. Leon-Garcia","doi":"10.1109/ICC.1998.685203","DOIUrl":"https://doi.org/10.1109/ICC.1998.685203","url":null,"abstract":"This paper proposes an approach to support integrated services Internet with RSVP over ATM shortcuts (ISAC). While similar to other LP switching approaches, our work is different in three major aspects. First, it focuses on supporting the integrated services model whereas other approaches currently support only best effort traffic. Second, our architecture adopts RSVP as the major signaling protocol and eliminates duplication of functionality in the ATM domain. Finally, while heterogeneous multicast has not yet been supported in any other approaches, it is considered in our proposal. Our design strives to achieve three fundamental objectives: (1) ensuring compatibility with existing networking standards, applications and system software, (2) maintaining data path efficiency, and (3) assuring portability for different operating system and switch control protocol. Our proposed architecture has been proven by a prototype implementation. Its operation has been verified by demonstrating a videoconferencing application. Our prototype has also been evaluated by measuring its signaling and control latency as well as the transfer delay of the data path.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121224976","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}
{"title":"M-ary orthogonal modulation for multi-carrier spread-spectrum uplink transmission","authors":"A. Dekorsy, K. Kammeyer","doi":"10.1109/ICC.1998.685163","DOIUrl":"https://doi.org/10.1109/ICC.1998.685163","url":null,"abstract":"We investigate the application of M-ary orthogonal modulation for multi-carrier spread spectrum (MCSS) uplink transmission over a Rayleigh fading indoor channel. Different coherent detection strategies with perfectly known channel coefficients are analyzed. Furthermore, we present a decision-directed estimation receiver to apply channel phase estimation. With decision-directed estimation no redundancy like training data is required to be transmitted. Simulation results show no performance loss for low E~/sub b//N/sub 0/ and only a moderate degradation for high E~/sub b//N/sub 0/ in comparison to ideal phase equalization. Moreover, the results are always contrasted with BPSK performance. Applying M-ary orthogonal modulation is revealed to outperform BPSK with respect to bit error rate and spectral efficiency, even if ideal equalization is considered for BPSK and decision-directed estimation for M-ary orthogonal modulation. The results are generally valid, whereas in this paper, they are based on the European HIPERLAN/2-standardization.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116682720","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}
{"title":"Delay-constrained asymptotically optimal detection using signal-space partitioning","authors":"Younggyun Kim, J. Moon","doi":"10.1109/ICC.1998.685095","DOIUrl":"https://doi.org/10.1109/ICC.1998.685095","url":null,"abstract":"A signal-space detector estimates the channel input symbol based on the location of the finite-length observation signal in a multi-dimensional signal-space. The decision boundary is formed by a set of hyperplanes. The resulting detector structure consists of linear discriminant functions, threshold detectors, and a Boolean logic function. Our goal is to minimize the number of linear discriminant functions (hyperplanes) with the same or negligible performance loss relative to the maximum likelihood sequence detector. Given all possible fixed-length signal sequences, our procedure finds a minimal set of hyperplanes by which every pair of opposite class signals can be separated by distance no less than the prescribed minimum distance. The proposed methods are applied to practical magnetic recording channels.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121591453","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}
{"title":"A study of RCU and switch resource allocation in a wireless ATM access network","authors":"Wai Chen","doi":"10.1109/ICC.1998.685181","DOIUrl":"https://doi.org/10.1109/ICC.1998.685181","url":null,"abstract":"We investigate radio control unit (RCU) and access switch resource allocation in a wireless ATM (asynchronous transfer mode) access network. Since user mobility is an important factor in wireless ATM networks, we propose a framework that allows the examination of user mobility impact on cell-level quality of service (QoS) and resource allocation in conjunction with mobility management functions including handoffs and call-level functions. The proposed analysis may be employed in a network design tool for studying the admission control policy and selecting system parameters to satisfy desired cell-level QoS.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116755146","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}
{"title":"Performance of turbo and trellis coded OFDM for LEO satellite channels in global mobile communications","authors":"W. Fernando, R. Rajatheva","doi":"10.1109/ICC.1998.682885","DOIUrl":"https://doi.org/10.1109/ICC.1998.682885","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) is a robust transmission technique in a Raleigh fading and Rician fading environments. The growing interest in OFDM research motivated us to propose OFDM for satellite communications. In this paper, trellis coded modulation (TCM) and turbo coding are considered with OFDM for a Rician fading channel according to the specifications given by the Iridium system. Bit error rat (BER) performances are analyzed with L and Ka bands. Turbo coded OFDM gives the best performance compared to convolutional coded and trellis coded OFDM systems. Peak to average power ratio (PAPR) can be reduced approximately by 1.6 dB with the help of partial transmit sequence technique.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"25 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125616650","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}
{"title":"CDMA receiver structures for overlay systems employing transmitter filtering","authors":"B. J. Rainbolt, Scott L. Miller","doi":"10.1109/ICC.1998.682878","DOIUrl":"https://doi.org/10.1109/ICC.1998.682878","url":null,"abstract":"In order to take advantage of the unused bandwidth available in sparsely populated narrowband systems, the concept of code-division multiple-access (CDMA) overlay has been examined (Milstein et al., 1992). It was shown in Rainbolt and Miller (1997) that even a CDMA system that is lightly loaded can cause significant degradation to the performance of the narrowband system, perhaps precluding the possibility of overlay. However, by notching the CDMA signal in those frequencies at which a narrowband user is operating, the effect of the CDMA interference on the performance of a narrowband user was shown to be greatly alleviated. This paper examines the effects of notch filtering on the performance of the CDMA system in an overlay scenario, and it is shown that the minimum mean-squared error (MMSE) receiver (Miller 1995; Rapajic and Vucetic 1994; Madhow and Honig 1994; Pateros and Saulnier 1996) can be used successfully, and offers a substantial improvement over the conventional matched-filter receiver. The results of this paper, along with those of Rainbolt and Miller, give strong support to both the feasibility and usefulness of CDMA overlay.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122436900","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}
{"title":"Supporting applications in a mobile multihop radio environment using route diversity. I. Non-real time data","authors":"N. Gogate, S. Panwar","doi":"10.1109/ICC.1998.685120","DOIUrl":"https://doi.org/10.1109/ICC.1998.685120","url":null,"abstract":"This paper motivates the need for the multiple path transport (MPT) of information in a multihop mobile radio network for supporting non-real time applications. Typical applications will need a higher bandwidth/higher reliability connection than that provided by current mobile networks. For supporting these applications a mobile node may need to set up and use multiple paths to the desired destination, either simply because of the lack of raw bandwidth on a single channel or because of its poor error characteristics, which reduces its effective throughput. In the context of this work, the principal reasons for considering such an architecture are providing high bandwidth and a more robust end-to-end connection. We describe a protocol architecture that addresses this need and, with the help of simple simulation models, we show that the delay and throughput performance of multiple path schemes is significantly better than that of a conventional scheme in which one session makes use of one path. For the data applications considered in this work, there is an additional advantage of security because tapping any one path does not give access to the complete information.","PeriodicalId":218354,"journal":{"name":"ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122666690","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}