Pub Date : 2000-05-15DOI: 10.1109/VETECS.2000.851437
Á. Schiffer
This paper presents an investigation of the properties of vehicular DC-lines for the purpose of data communication. In doing so, the aim is to model the transfer channel that represents these lines. The basis for this investigation is established by measurements of battery lines in vehicles. First various line segments are regarded without disturbance. In a second step the existing interference is investigated. With particular interest the impulsive noise is regarded. Important is the possibility to calculate its random occurrence by a statistical process called Poisson process. The present results are the basis for further investigations of data communication over DC-lines in cars.
{"title":"Statistical channel and noise modeling of vehicular DC-lines for data communication","authors":"Á. Schiffer","doi":"10.1109/VETECS.2000.851437","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851437","url":null,"abstract":"This paper presents an investigation of the properties of vehicular DC-lines for the purpose of data communication. In doing so, the aim is to model the transfer channel that represents these lines. The basis for this investigation is established by measurements of battery lines in vehicles. First various line segments are regarded without disturbance. In a second step the existing interference is investigated. With particular interest the impulsive noise is regarded. Important is the possibility to calculate its random occurrence by a statistical process called Poisson process. The present results are the basis for further investigations of data communication over DC-lines in cars.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"22 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120905900","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851529
Chen Jun, Sun Rong, W. Xinmei
Optimal threshold sequential decoding algorithms for binary linear block codes which combine the sequential decoding with the threshold decoding are presented. They use the stack algorithm to search through the trellis of the block codes for a path which has the optimal value of the Fano metric function. When a new candidate codeword is found, an optimality check is performed on it by using the Fano-optimal threshold. If checked successfully, the candidate codeword is the most likely (ML) codeword and the search stops. Otherwise the search process continues until either an optimal path is found, which also represents the ML codeword, or the memory buffer of the decoder overflows, in which case the hard decision word is output. Simulation results show that compared with the decoding algorithms available, the proposed decoding algorithms significantly reduce the decoding complexity without losing the decoding performance.
{"title":"Optimal threshold sequential decoding algorithms for linear block codes","authors":"Chen Jun, Sun Rong, W. Xinmei","doi":"10.1109/VETECS.2000.851529","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851529","url":null,"abstract":"Optimal threshold sequential decoding algorithms for binary linear block codes which combine the sequential decoding with the threshold decoding are presented. They use the stack algorithm to search through the trellis of the block codes for a path which has the optimal value of the Fano metric function. When a new candidate codeword is found, an optimality check is performed on it by using the Fano-optimal threshold. If checked successfully, the candidate codeword is the most likely (ML) codeword and the search stops. Otherwise the search process continues until either an optimal path is found, which also represents the ML codeword, or the memory buffer of the decoder overflows, in which case the hard decision word is output. Simulation results show that compared with the decoding algorithms available, the proposed decoding algorithms significantly reduce the decoding complexity without losing the decoding performance.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121153990","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851655
J. Yan, S. Kozono
In wide-band mobile communication systems, the received signal-level variation characteristics are different from those in narrow-band systems. To express the variation from narrow-band to wide-band transmissions, a new propagation parameter was proposed called "equivalent received bandwidth", which is the product of receiver bandwidth 2/spl Delta/f and maximum difference in path lengths /spl Delta/L/sub max/. On the other hand, Nakagami-m (1960) distribution offers a more flexible distribution of received signal-level variations in narrowband mobile channels. Therefore, we have expressed the level variation in narrow and wide band using the Nakagami-m distribution as function of 2/spl Delta/f/spl Delta/L/sub max/, and evaluated the distribution by computer simulation.
{"title":"Study of Nakagami m parameter in mobile wide band channel-case of no line of sight","authors":"J. Yan, S. Kozono","doi":"10.1109/VETECS.2000.851655","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851655","url":null,"abstract":"In wide-band mobile communication systems, the received signal-level variation characteristics are different from those in narrow-band systems. To express the variation from narrow-band to wide-band transmissions, a new propagation parameter was proposed called \"equivalent received bandwidth\", which is the product of receiver bandwidth 2/spl Delta/f and maximum difference in path lengths /spl Delta/L/sub max/. On the other hand, Nakagami-m (1960) distribution offers a more flexible distribution of received signal-level variations in narrowband mobile channels. Therefore, we have expressed the level variation in narrow and wide band using the Nakagami-m distribution as function of 2/spl Delta/f/spl Delta/L/sub max/, and evaluated the distribution by computer simulation.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116538240","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851394
I. Koutsopoulos, P. Constantinou
In a satellite with multiple spot beams, the scenario of one beam covering an urban area and another beam covering a rural area is ordinary. In order to provide reliable service to the maximum number of users, the satellite can adjust power levels at its antennas. We propose a hybrid ray tracing-based model, consisting of deterministic and statistical attributes, to estimate signal quality based on the type of surrounding environment. The problem of providing acceptable power level to the maximum number of users is then formulated as a linear programming problem and its solution can be applied as feedback information via a control channel to the satellite emitter system to adjust power levels at specific antennas.
{"title":"Joint channel estimation and satellite antenna power control in mobile satellite networks using ray tracing","authors":"I. Koutsopoulos, P. Constantinou","doi":"10.1109/VETECS.2000.851394","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851394","url":null,"abstract":"In a satellite with multiple spot beams, the scenario of one beam covering an urban area and another beam covering a rural area is ordinary. In order to provide reliable service to the maximum number of users, the satellite can adjust power levels at its antennas. We propose a hybrid ray tracing-based model, consisting of deterministic and statistical attributes, to estimate signal quality based on the type of surrounding environment. The problem of providing acceptable power level to the maximum number of users is then formulated as a linear programming problem and its solution can be applied as feedback information via a control channel to the satellite emitter system to adjust power levels at specific antennas.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125286156","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851639
M. Moretti, E. Nostrato, S. Piagneri, G. Janssen
The dual-signal receiver is a narrowband multi-user receiver, which allows the reception of two signals simultaneously transmitted over the same channel. To increase the receiver performance in a fading environment, antenna combining is applied and its performance is evaluated. Results obtained for the dual-signal receiver with minimum mean square error combining and null steering combining techniques are compared to both the theoretical optimum represented by joint detection of the two signals and to the results obtained for a conventional receiver with minimum mean square error combining. These comparisons show that the dual-signal receiver is able to achieve the performance of joint detection and outperforms a conventional receiver implemented with multiple antennas.
{"title":"Antenna combining applied to the dual-signal receiver","authors":"M. Moretti, E. Nostrato, S. Piagneri, G. Janssen","doi":"10.1109/VETECS.2000.851639","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851639","url":null,"abstract":"The dual-signal receiver is a narrowband multi-user receiver, which allows the reception of two signals simultaneously transmitted over the same channel. To increase the receiver performance in a fading environment, antenna combining is applied and its performance is evaluated. Results obtained for the dual-signal receiver with minimum mean square error combining and null steering combining techniques are compared to both the theoretical optimum represented by joint detection of the two signals and to the results obtained for a conventional receiver with minimum mean square error combining. These comparisons show that the dual-signal receiver is able to achieve the performance of joint detection and outperforms a conventional receiver implemented with multiple antennas.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122487867","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851558
Gautam Trivedi, B. Jabbari, George
This paper considers the effect of unequal power control in direct sequence CDMA cellular networks in the reverse direction to achieve differentiated quality of service. In particular, power control can be used to maintain the required E/sub b//I/sub 0/ for a given type of traffic to meet the desired service quality. Here, an analytical approach is used to determine the probability of outage when two types of traffic with different quality of service requirements coexist. Results are presented for systems with equal and unequal power control.
{"title":"Performance analysis of a CDMA network with mixed traffic using unequal power control","authors":"Gautam Trivedi, B. Jabbari, George","doi":"10.1109/VETECS.2000.851558","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851558","url":null,"abstract":"This paper considers the effect of unequal power control in direct sequence CDMA cellular networks in the reverse direction to achieve differentiated quality of service. In particular, power control can be used to maintain the required E/sub b//I/sub 0/ for a given type of traffic to meet the desired service quality. Here, an analytical approach is used to determine the probability of outage when two types of traffic with different quality of service requirements coexist. Results are presented for systems with equal and unequal power control.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122877414","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851561
M. Huemer, L. Reindl, A. Springer, R. Weigel
In this paper, we consider the problem of linear equalization of polyphase channels and its implementation in the frequency domain. These channels may result from oversampling the single output of a transmission channel or/and by receiving multiple outputs of an antenna array. From the polyphase representation of the fractionally spaced channels/equalizers we derive a novel low complexity frequency domain implementation structure for optimum infinite-length equalizers. As an example we apply the concept to a high speed wireless indoor communication system. The digital baseband processing requirements are considered and simulation results for typical multipath channel conditions are presented.
{"title":"Frequency domain equalization of linear polyphase channels","authors":"M. Huemer, L. Reindl, A. Springer, R. Weigel","doi":"10.1109/VETECS.2000.851561","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851561","url":null,"abstract":"In this paper, we consider the problem of linear equalization of polyphase channels and its implementation in the frequency domain. These channels may result from oversampling the single output of a transmission channel or/and by receiving multiple outputs of an antenna array. From the polyphase representation of the fractionally spaced channels/equalizers we derive a novel low complexity frequency domain implementation structure for optimum infinite-length equalizers. As an example we apply the concept to a high speed wireless indoor communication system. The digital baseband processing requirements are considered and simulation results for typical multipath channel conditions are presented.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131216377","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851358
K. C. Teh, A. Kot, K.H. Li
This paper presents the performance analysis of a fast frequency-hopped binary frequency-shift-keying (FFH/BFSK) linear-combining receiver in conjunction with a fast Fourier transform (FFT) processor. Under the conditions of partial-band noise jamming (PBNJ) and additive white Gaussian noise (AWGN), the bit-error rate (BER) expressions of the proposed FFT-based linear-combining receiver are derived in terms of the characteristic functions of the decision statistics. The BER expressions, validated by simulation results, are applicable to any arbitrary diversity level. The proposed FFT-based receiver provides an alternative to the conventional matched-filter receiver. The FFT-based receiver is shown to give comparable performance with the corresponding matched-filter receiver. The worst-case PBNJ fraction is shown to be inversely proportional to the signal-to-jamming ratio and the performance of the FFT-based linear-combining receiver is degraded as the diversity level is increased.
{"title":"Error probabilities of an FFT-based FFH/BFSK linear-combining receiver with partial-band noise jamming and AWGN","authors":"K. C. Teh, A. Kot, K.H. Li","doi":"10.1109/VETECS.2000.851358","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851358","url":null,"abstract":"This paper presents the performance analysis of a fast frequency-hopped binary frequency-shift-keying (FFH/BFSK) linear-combining receiver in conjunction with a fast Fourier transform (FFT) processor. Under the conditions of partial-band noise jamming (PBNJ) and additive white Gaussian noise (AWGN), the bit-error rate (BER) expressions of the proposed FFT-based linear-combining receiver are derived in terms of the characteristic functions of the decision statistics. The BER expressions, validated by simulation results, are applicable to any arbitrary diversity level. The proposed FFT-based receiver provides an alternative to the conventional matched-filter receiver. The FFT-based receiver is shown to give comparable performance with the corresponding matched-filter receiver. The worst-case PBNJ fraction is shown to be inversely proportional to the signal-to-jamming ratio and the performance of the FFT-based linear-combining receiver is degraded as the diversity level is increased.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131377451","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851449
Kuan-Hua Chen, Kwang-Cheng Chen
We adapt a general form of multiple access multi-layer collision anticipation/resolution (MULCAR) to describe the existing IEEE 802.11 MAC DCF. We further explore the proper way of tailoring the splitting tree to achieve higher throughput and lower delay, primarily for high rate OFDM transmission wireless LAN at 5 GHz.
我们采用了一种通用形式的多址多层碰撞预测/分辨率(MULCAR)来描述现有的IEEE 802.11 MAC DCF。我们进一步探讨了裁剪分割树的适当方法，以实现更高的吞吐量和更低的延迟，主要针对5 GHz的高速率OFDM传输无线局域网。
{"title":"Enhanced medium access control of IP-based high speed wireless LANs","authors":"Kuan-Hua Chen, Kwang-Cheng Chen","doi":"10.1109/VETECS.2000.851449","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851449","url":null,"abstract":"We adapt a general form of multiple access multi-layer collision anticipation/resolution (MULCAR) to describe the existing IEEE 802.11 MAC DCF. We further explore the proper way of tailoring the splitting tree to achieve higher throughput and lower delay, primarily for high rate OFDM transmission wireless LAN at 5 GHz.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128003437","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 : 2000-05-15DOI: 10.1109/VETECS.2000.851549
Jonghyun Lee, J. Chun, Jongheon Lee, B. Yu
A method of estimating the spatio-temporal channel parameter is proposed. Using a mechanically rotating antenna which has a narrow beam width, we show how to estimate the distribution of the incoming signal in the directions of the angle and delay. With the proposed method, the estimation problem is represented as a deconvolution problem which can be converted as a matrix equation with constraints. We also show the results of the proposed method tested with field data.
{"title":"Angular distribution estimation of the arriving signal using a mechanically steered fixed beam antenna","authors":"Jonghyun Lee, J. Chun, Jongheon Lee, B. Yu","doi":"10.1109/VETECS.2000.851549","DOIUrl":"https://doi.org/10.1109/VETECS.2000.851549","url":null,"abstract":"A method of estimating the spatio-temporal channel parameter is proposed. Using a mechanically rotating antenna which has a narrow beam width, we show how to estimate the distribution of the incoming signal in the directions of the angle and delay. With the proposed method, the estimation problem is represented as a deconvolution problem which can be converted as a matrix equation with constraints. We also show the results of the proposed method tested with field data.","PeriodicalId":318880,"journal":{"name":"VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026)","volume":"58 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132640628","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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