Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991790
S. Furrer, D. Dahlhaus
This paper investigates the performance of orthogonal frequency-division multiplexing (OFDM) systems applying linear minimum mean-square-error (LMMSE) based channel estimation for coherent detection. We analyze and discuss the robustness of the estimator's mean-square error (MSE) performance under estimator-to-channel statistics mismatch and derive a closed form expression of the mean bit-error rate (BER) for coherent binary signaling. Different cases of single antenna and diversity reception over Rayleigh and Rician fading multipath channels are considered.
{"title":"Mean bit-error rates for OFDM transmission with robust channel estimation and space diversity reception","authors":"S. Furrer, D. Dahlhaus","doi":"10.1109/IZSBC.2002.991790","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991790","url":null,"abstract":"This paper investigates the performance of orthogonal frequency-division multiplexing (OFDM) systems applying linear minimum mean-square-error (LMMSE) based channel estimation for coherent detection. We analyze and discuss the robustness of the estimator's mean-square error (MSE) performance under estimator-to-channel statistics mismatch and derive a closed form expression of the mean bit-error rate (BER) for coherent binary signaling. Different cases of single antenna and diversity reception over Rayleigh and Rician fading multipath channels are considered.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124430393","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991796
S. Shin, K. Jeong, Kwang-baek Yeom, Chan-koo Kang, J. Ihm, Dongwoo Kim
cdma2000 1X is the first commercialized mobile communication system that enables broadband data communication on the wireless mobile channel. cdma2000 1X provides a high data rate service on the forward link and the maximum total data transmission throughput is 384 kbps. The CDMA system uses the pilot channel for channel estimation and it is known that the coverage is determined by the pilot channel. High pilot power improves the system performance by good channel estimation. Nevertheless, high pilot power can decrease the system capacity because it consumes the forward link transmitted power. This paper reports simulation of the system capacity in the case of TIA/EIA-97-C recommended pilot power ratio and IS-95 operation criteria. From the simulation results, it is demonstrated that IS-95 operation criteria shows better performance than the TIA/EIA-97-C recommended specifications.
{"title":"cdma2000 1X performance comparison with pilot power ratio","authors":"S. Shin, K. Jeong, Kwang-baek Yeom, Chan-koo Kang, J. Ihm, Dongwoo Kim","doi":"10.1109/IZSBC.2002.991796","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991796","url":null,"abstract":"cdma2000 1X is the first commercialized mobile communication system that enables broadband data communication on the wireless mobile channel. cdma2000 1X provides a high data rate service on the forward link and the maximum total data transmission throughput is 384 kbps. The CDMA system uses the pilot channel for channel estimation and it is known that the coverage is determined by the pilot channel. High pilot power improves the system performance by good channel estimation. Nevertheless, high pilot power can decrease the system capacity because it consumes the forward link transmitted power. This paper reports simulation of the system capacity in the case of TIA/EIA-97-C recommended pilot power ratio and IS-95 operation criteria. From the simulation results, it is demonstrated that IS-95 operation criteria shows better performance than the TIA/EIA-97-C recommended specifications.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131066708","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991786
Ping Luo, Yongliang Guan
Space-time coding (STC) is a promising technique to improve the capacity of the wireless communications channel. When STC is used in an unequalized multipath fading channel, it presents an irreducible error floor due to the intersymbol interference (ISI). Optimum receivers for STC in multipath fading channels are proposed in this paper. The decoding complexity of this optimum receiver is analyzed. The upper bound of the pairwise error probability is derived and simulation results are presented. Compare to the STC system in a flat fading channel, the STC system equipped with an optimum receiver can achieve additional coding diversity in a multipath fading channel.
{"title":"Optimum receiver for space-time trellis code in multipath fading channel","authors":"Ping Luo, Yongliang Guan","doi":"10.1109/IZSBC.2002.991786","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991786","url":null,"abstract":"Space-time coding (STC) is a promising technique to improve the capacity of the wireless communications channel. When STC is used in an unequalized multipath fading channel, it presents an irreducible error floor due to the intersymbol interference (ISI). Optimum receivers for STC in multipath fading channels are proposed in this paper. The decoding complexity of this optimum receiver is analyzed. The upper bound of the pairwise error probability is derived and simulation results are presented. Compare to the STC system in a flat fading channel, the STC system equipped with an optimum receiver can achieve additional coding diversity in a multipath fading channel.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131984736","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991742
J. Sterbenz
This paper considers the challenges and opportunities in the provision of active processing in broadband networks. Active networking aims to provide a systematic mechanism to use processing capabilities within network nodes (switches and routers) to allow the dynamic provisioning and composition of advanced services. Many of these services are traditionally offered at the application layer or require changes to the network layer standards. Active networking has the potential for improving performance by providing functionality at the right place and layer, without the need to go up to the application layer. The processing gains achieved by Moore's Law are frequently touted as the motivation for active networking. It is the ratio of processing and memory to bandwidth, however, that governs how much active processing is achievable. Active node architectures should support active processing with a flexible mix of software and programmable hardware based on the granularity of the processing. Significant practical challenges remain before active networking technology will be deployed and adopted. In particular, active networking is a technology awaiting the killer application.
{"title":"Intelligence in future broadband networks: challenges and opportunities in high-speed active networking","authors":"J. Sterbenz","doi":"10.1109/IZSBC.2002.991742","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991742","url":null,"abstract":"This paper considers the challenges and opportunities in the provision of active processing in broadband networks. Active networking aims to provide a systematic mechanism to use processing capabilities within network nodes (switches and routers) to allow the dynamic provisioning and composition of advanced services. Many of these services are traditionally offered at the application layer or require changes to the network layer standards. Active networking has the potential for improving performance by providing functionality at the right place and layer, without the need to go up to the application layer. The processing gains achieved by Moore's Law are frequently touted as the motivation for active networking. It is the ratio of processing and memory to bandwidth, however, that governs how much active processing is achievable. Active node architectures should support active processing with a flexible mix of software and programmable hardware based on the granularity of the processing. Significant practical challenges remain before active networking technology will be deployed and adopted. In particular, active networking is a technology awaiting the killer application.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132907459","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991758
M. Krishna, V. Gadre, U. Desai
We have developed a new approach to model broadband network traffic based on multiplicative multifractal models. We propose a VVGM (variable variance Gaussian multiplier) multiplicative multifractal model for modeling VBR traffic. The results of the detailed statistical and performance analysis on the original and the synthesized traces are presented. The results of the proposed model on comparison with the traditionally used fARIMA and the wavelet based video traffic process are shown to be significantly better.
{"title":"Multiplicative multifractal process based modeling of broadband traffic processes: variable bit rate video traffic","authors":"M. Krishna, V. Gadre, U. Desai","doi":"10.1109/IZSBC.2002.991758","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991758","url":null,"abstract":"We have developed a new approach to model broadband network traffic based on multiplicative multifractal models. We propose a VVGM (variable variance Gaussian multiplier) multiplicative multifractal model for modeling VBR traffic. The results of the detailed statistical and performance analysis on the original and the synthesized traces are presented. The results of the proposed model on comparison with the traditionally used fARIMA and the wavelet based video traffic process are shown to be significantly better.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133339420","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991783
R. Irmer, G. Fettweis
In order to limit interference and increase system capacity in CDMA systems, the transmitted power required to achieve a certain performance should be as low as possible. Usually, receivers are designed to overcome the problems caused by the frequency-selective wireless channel. However, if the channel impulse response (CIR) is a priori known at the transmitter, the signal we want to transmit can be preprocessed. The CIR for the downlink can be estimated in the uplink in time-division duplex (TDD) systems or conveyed in a feedback channel from the receiver to the transmitter. By using multiple transmit antennas in multiple-input single-output (MISO) systems, performance improvement potentials are created. Several MISO concepts using FIR filters both in the transmitter and receiver are compared, their decision variables are given and the SNRs at the receivers are calculated analytically. The MISO generalized selection eigenprecoder is derived which offers the possibility to trade off performance and complexity.
{"title":"MISO concepts for frequency-selective channels","authors":"R. Irmer, G. Fettweis","doi":"10.1109/IZSBC.2002.991783","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991783","url":null,"abstract":"In order to limit interference and increase system capacity in CDMA systems, the transmitted power required to achieve a certain performance should be as low as possible. Usually, receivers are designed to overcome the problems caused by the frequency-selective wireless channel. However, if the channel impulse response (CIR) is a priori known at the transmitter, the signal we want to transmit can be preprocessed. The CIR for the downlink can be estimated in the uplink in time-division duplex (TDD) systems or conveyed in a feedback channel from the receiver to the transmitter. By using multiple transmit antennas in multiple-input single-output (MISO) systems, performance improvement potentials are created. Several MISO concepts using FIR filters both in the transmitter and receiver are compared, their decision variables are given and the SNRs at the receivers are calculated analytically. The MISO generalized selection eigenprecoder is derived which offers the possibility to trade off performance and complexity.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121168520","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991744
J. Thompson, R. Tanner, D. Bevan
This paper discusses wireless systems using antenna arrays at both the transmitter and receiver. Space-time coding exploits the parallelism of the radio channels formed. Theoretical results on signal-to-noise ratio (SNR) degradation due to imperfect pilot-based channel estimation are presented for Rayleigh fading environments. The analysis is also compared with simulation results.
{"title":"Weight error loss for wireless systems with antenna arrays","authors":"J. Thompson, R. Tanner, D. Bevan","doi":"10.1109/IZSBC.2002.991744","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991744","url":null,"abstract":"This paper discusses wireless systems using antenna arrays at both the transmitter and receiver. Space-time coding exploits the parallelism of the radio channels formed. Theoretical results on signal-to-noise ratio (SNR) degradation due to imperfect pilot-based channel estimation are presented for Rayleigh fading environments. The analysis is also compared with simulation results.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125315978","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991795
A. Mawira
A theoretical estimate of the capacity of interference limited mobile ad-hoc networks (MANET), without an interference cancellation scheme, is given. The calculation is carried out using a realistic propagation model, a simplified system model and statistical consideration of mobile distances. An expression for the average carrier-to-interference ratio is then derived. This is subsequently used with the Shannon limit to determine the capacity. Expressions are given for calculating the dependence of throughput on availability and propagation.
{"title":"Estimate of mean C/I and capacity of interference limited mobile ad-hoc networks","authors":"A. Mawira","doi":"10.1109/IZSBC.2002.991795","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991795","url":null,"abstract":"A theoretical estimate of the capacity of interference limited mobile ad-hoc networks (MANET), without an interference cancellation scheme, is given. The calculation is carried out using a realistic propagation model, a simplified system model and statistical consideration of mobile distances. An expression for the average carrier-to-interference ratio is then derived. This is subsequently used with the Shannon limit to determine the capacity. Expressions are given for calculating the dependence of throughput on availability and propagation.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124514437","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991756
C. Amo-Quarm, M. Mezhoudi, K. Ravindran
The autoregressive process has been used by several authors to model MPEG video traffic and attempts to capture the frame correlation as well as the Gaussian shape of the bit rate variation. However, the autoregressive process alone does not capture scene changes. In this paper, we propose an autoregressive model of order P, AR(P) + IAP (interrupted autoregressive process), to capture scene changes. We compare the model performance to that of the actual video trace, as well as the autoregressive process without scene changes.
{"title":"Improved autoregressive model","authors":"C. Amo-Quarm, M. Mezhoudi, K. Ravindran","doi":"10.1109/IZSBC.2002.991756","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991756","url":null,"abstract":"The autoregressive process has been used by several authors to model MPEG video traffic and attempts to capture the frame correlation as well as the Gaussian shape of the bit rate variation. However, the autoregressive process alone does not capture scene changes. In this paper, we propose an autoregressive model of order P, AR(P) + IAP (interrupted autoregressive process), to capture scene changes. We compare the model performance to that of the actual video trace, as well as the autoregressive process without scene changes.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129216084","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}
Pub Date : 2002-08-07DOI: 10.1109/IZSBC.2002.991772
M. Stege, M. Bronzel, Ferhard Fettweis
The capacity of multiple input multiple output (MIMO) communication systems depends on the spatial properties of the MIMO channel. This work shows how in particular partial correlation of channel coefficients affects the capacity of the system. For partially correlated channel coefficients the performance of such systems can be further be enhanced by the use of channel knowledge at the transmitter. Resulting capacity gains are presented for complete and only statistical knowledge of the channel at the transmitter.
{"title":"MIMO-capacities for COST 259 scenarios","authors":"M. Stege, M. Bronzel, Ferhard Fettweis","doi":"10.1109/IZSBC.2002.991772","DOIUrl":"https://doi.org/10.1109/IZSBC.2002.991772","url":null,"abstract":"The capacity of multiple input multiple output (MIMO) communication systems depends on the spatial properties of the MIMO channel. This work shows how in particular partial correlation of channel coefficients affects the capacity of the system. For partially correlated channel coefficients the performance of such systems can be further be enhanced by the use of channel knowledge at the transmitter. Resulting capacity gains are presented for complete and only statistical knowledge of the channel at the transmitter.","PeriodicalId":336991,"journal":{"name":"2002 International Zurich Seminar on Broadband Communications Access - Transmission - Networking (Cat. No.02TH8599)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129407954","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}
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