Pub Date : 2003-04-09DOI: 10.1109/ICCT.2003.1209740
Xingqing Cheng, Qiang Wu, Daoben Li
Two semi-blind multi-user receiver's algorithms based on antenna array are proposed. Here we suppose multiple receiver antennas are our targets. Firstly we estimate the known users' data and subtract them form the received signal. Secondly we obtain an orthogonal projection matrix (M) of the unknown users' signal through subspace tracking. Finally by using the matrix M, we transform the detection problem of known users' data into a minimization problem of quadratic convex function and so that we can solve it with conjugate gradient (CG) algorithm. The initial estimation of known users' data also serves as the initial value of CG to speed up convergence. We have simulated the performance of the receivers' algorithm under various conditions and concluded that they are better than other corresponding algorithms.
{"title":"The semi-blind multiuser receiver based on antenna array","authors":"Xingqing Cheng, Qiang Wu, Daoben Li","doi":"10.1109/ICCT.2003.1209740","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209740","url":null,"abstract":"Two semi-blind multi-user receiver's algorithms based on antenna array are proposed. Here we suppose multiple receiver antennas are our targets. Firstly we estimate the known users' data and subtract them form the received signal. Secondly we obtain an orthogonal projection matrix (M) of the unknown users' signal through subspace tracking. Finally by using the matrix M, we transform the detection problem of known users' data into a minimization problem of quadratic convex function and so that we can solve it with conjugate gradient (CG) algorithm. The initial estimation of known users' data also serves as the initial value of CG to speed up convergence. We have simulated the performance of the receivers' algorithm under various conditions and concluded that they are better than other corresponding algorithms.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124841165","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209682
Wang Yafeng, Yang Hongwen
Forward link packet data service scheduling algorithm in mobile communication systems is researched in this paper. After analyzing a few kinds of familiar scheduling algorithms briefly, a novel-scheduling algorithm is proposed. Both the theoretical analysis and the simulation results show that this algorithm takes on several advantages. On the premise of satisfying the fairness criteria, it can increase the system throughput and decrease the average packet delay.
{"title":"Retransmission priority scheduling algorithm for forward link packet data service","authors":"Wang Yafeng, Yang Hongwen","doi":"10.1109/ICCT.2003.1209682","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209682","url":null,"abstract":"Forward link packet data service scheduling algorithm in mobile communication systems is researched in this paper. After analyzing a few kinds of familiar scheduling algorithms briefly, a novel-scheduling algorithm is proposed. Both the theoretical analysis and the simulation results show that this algorithm takes on several advantages. On the premise of satisfying the fairness criteria, it can increase the system throughput and decrease the average packet delay.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125962288","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209690
Huang Hui, Wu Lili, Liao Guisheng
In this paper, the method of detection for the DS-CDMA downlink operating in a frequency selective fading environment is considered. A novel detection method using constant modulus algorithm (CMA) is proposed. With the projection of the equalizer output on the unoccupied spreading codes being zero as a constraint condition, we give an adaptive and a batch linearly constrained CMAs. The proposed method can be used in periodic or aperiodic spreading system and overcomes the shortcoming that the conventional CMA cannot guarantee to converge to a desired user. Simulation results demonstrate that the proposed method offers high detection performance and is capable of combating both channel fading and multiple-access interference.
{"title":"A novel receiver for DS-CDMA downlink","authors":"Huang Hui, Wu Lili, Liao Guisheng","doi":"10.1109/ICCT.2003.1209690","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209690","url":null,"abstract":"In this paper, the method of detection for the DS-CDMA downlink operating in a frequency selective fading environment is considered. A novel detection method using constant modulus algorithm (CMA) is proposed. With the projection of the equalizer output on the unoccupied spreading codes being zero as a constraint condition, we give an adaptive and a batch linearly constrained CMAs. The proposed method can be used in periodic or aperiodic spreading system and overcomes the shortcoming that the conventional CMA cannot guarantee to converge to a desired user. Simulation results demonstrate that the proposed method offers high detection performance and is capable of combating both channel fading and multiple-access interference.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126196016","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209806
J. Takano, N. Tanaka, Y. Takasaki
Upgrading strategies are investigated for application in future super-broadband subscriber loops, where such technologies as super-multi-channel distribution, super-high definition pictures, super large capacity storage and all-optical transport are expected to become available. Gradual upgrading is considered so that future systems can keep compatibility with existing systems. First, time frame and strategies for subscriber loop upgrade are overviewed and assumptions for evolution of broadband multimedia distribution systems are discussed. Next, upgrading strategies for broadband multimedia distribution are overviewed to discuss new schemes for representing broadband video channels. Finally, optimization of upgrading is investigated in terms of rotatable display schemes.
{"title":"Upgradable distribution for broadband networks","authors":"J. Takano, N. Tanaka, Y. Takasaki","doi":"10.1109/ICCT.2003.1209806","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209806","url":null,"abstract":"Upgrading strategies are investigated for application in future super-broadband subscriber loops, where such technologies as super-multi-channel distribution, super-high definition pictures, super large capacity storage and all-optical transport are expected to become available. Gradual upgrading is considered so that future systems can keep compatibility with existing systems. First, time frame and strategies for subscriber loop upgrade are overviewed and assumptions for evolution of broadband multimedia distribution systems are discussed. Next, upgrading strategies for broadband multimedia distribution are overviewed to discuss new schemes for representing broadband video channels. Finally, optimization of upgrading is investigated in terms of rotatable display schemes.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115583159","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209697
Wei-xin Yao, Yang Xiao
In mobile communications, one way to combat both fading and cochannel interference is diversity reception. Thus, we proposed a novel SIR weighting post detection combining diversity scheme. The SIR is estimated and used as the weighting factor to compensate severe cochannel interference. The most distinctive feature of the proposed method is that the weighting factor (SIR) is estimated from both the matched filter output and a simple equation. Computer simulations confirm that the proposed diversity scheme achieves a better performance than the conventional method.
{"title":"A novel SIR weighting combining diversity method for mobile communication system","authors":"Wei-xin Yao, Yang Xiao","doi":"10.1109/ICCT.2003.1209697","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209697","url":null,"abstract":"In mobile communications, one way to combat both fading and cochannel interference is diversity reception. Thus, we proposed a novel SIR weighting post detection combining diversity scheme. The SIR is estimated and used as the weighting factor to compensate severe cochannel interference. The most distinctive feature of the proposed method is that the weighting factor (SIR) is estimated from both the matched filter output and a simple equation. Computer simulations confirm that the proposed diversity scheme achieves a better performance than the conventional method.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116125866","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209744
Teng Yong, Wu Junli, Luo Tao, Yue Guangxin
An OFDM system of concatenating trellis coded modulation with space-time block coding is proposed. The analysis of pairwise error probability (PEP) shows that if TCM is properly designed the maximum diversity order of the system is achieved. Compared with the uncoded OFDM system and STTC OFDM system with the same number of states, proposed system significantly improves the performance.
{"title":"Concatenated space-time block code with trellis coded modulation in OFDM system","authors":"Teng Yong, Wu Junli, Luo Tao, Yue Guangxin","doi":"10.1109/ICCT.2003.1209744","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209744","url":null,"abstract":"An OFDM system of concatenating trellis coded modulation with space-time block coding is proposed. The analysis of pairwise error probability (PEP) shows that if TCM is properly designed the maximum diversity order of the system is achieved. Compared with the uncoded OFDM system and STTC OFDM system with the same number of states, proposed system significantly improves the performance.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122834027","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209680
M. Abolbashari, H. Aghaeinia
In this paper some properties of sequence derived from proposed chaotic dynamic systems, are evaluated and analyzed. First, sequence has been investigated as a sequence with real values. It is followed by evaluating sequence properties when its values have been quantized. It has been demonstrated that these sequences have better performance than gold sequences according to merit factor and W-index criteria.
{"title":"Design and analysis of a new sequence set by using chaotic dynamic systems for spread spectrum communication applications","authors":"M. Abolbashari, H. Aghaeinia","doi":"10.1109/ICCT.2003.1209680","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209680","url":null,"abstract":"In this paper some properties of sequence derived from proposed chaotic dynamic systems, are evaluated and analyzed. First, sequence has been investigated as a sequence with real values. It is followed by evaluating sequence properties when its values have been quantized. It has been demonstrated that these sequences have better performance than gold sequences according to merit factor and W-index criteria.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122486703","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209263
Xue Chen, Meihong Yu, Yang Zhang, YuHong Deng
Ethernet-based PON (EPON) technology is being pushed as the answer for delivering data and other services to both business and residential customers. Dynamic bandwidth assignment (DBA) is necessary for EPONs to provide burst data services effectively. To focus on good fairness of bandwidth assignment, high bandwidth utilization, low cost and feasibility, a novel upstream DBA scheme for the Ethernet PONs is proposed in this paper. Issues of DBA design in EPON systems are investigated. The key performance of novel scheme through simulation is described and the simulation results show the scheme is fair and feasible.
{"title":"A novel upstream dynamic bandwidth assignment scheme for Ethernet PONs","authors":"Xue Chen, Meihong Yu, Yang Zhang, YuHong Deng","doi":"10.1109/ICCT.2003.1209263","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209263","url":null,"abstract":"Ethernet-based PON (EPON) technology is being pushed as the answer for delivering data and other services to both business and residential customers. Dynamic bandwidth assignment (DBA) is necessary for EPONs to provide burst data services effectively. To focus on good fairness of bandwidth assignment, high bandwidth utilization, low cost and feasibility, a novel upstream DBA scheme for the Ethernet PONs is proposed in this paper. Issues of DBA design in EPON systems are investigated. The key performance of novel scheme through simulation is described and the simulation results show the scheme is fair and feasible.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122513208","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209855
Yuhai Yu, Ping Zhang
This paper mainly describes the concept of universal personal telecommunication in mobile network, proposes to add an agent network layer on top of the existing mobile network, applies agent technology to realize UPT service, and presents the basic UPT service features and their realizing schemes by using agent technology.
{"title":"Agent based UPT realization","authors":"Yuhai Yu, Ping Zhang","doi":"10.1109/ICCT.2003.1209855","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209855","url":null,"abstract":"This paper mainly describes the concept of universal personal telecommunication in mobile network, proposes to add an agent network layer on top of the existing mobile network, applies agent technology to realize UPT service, and presents the basic UPT service features and their realizing schemes by using agent technology.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"341 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122850394","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 : 2003-04-09DOI: 10.1109/ICCT.2003.1209908
Wu Jiang, Wu Weiling
In this paper, we investigate robust channel estimation methods for OFDM systems. Three pilot-symbol-aided channel estimation schemes are discussed, i.e., the maximum likelihood estimator (MLE), the estimator based on parametric channel modeling, and the least square (LS) estimation with low-pass interpolation. We analyze the complexities of the estimators and compare the mean square error (MSE) and symbol error rate (SER) over frequency-selective fading channels. It is shown that the low-pass interpolation-based estimation gives the lowest complexity among the three estimators, but its performance is not so good as the other two. The estimator based on parametric channel modeling is simpler than MLE with slightly better performance.
{"title":"A comparative study of robust channel estimators for OFDM systems","authors":"Wu Jiang, Wu Weiling","doi":"10.1109/ICCT.2003.1209908","DOIUrl":"https://doi.org/10.1109/ICCT.2003.1209908","url":null,"abstract":"In this paper, we investigate robust channel estimation methods for OFDM systems. Three pilot-symbol-aided channel estimation schemes are discussed, i.e., the maximum likelihood estimator (MLE), the estimator based on parametric channel modeling, and the least square (LS) estimation with low-pass interpolation. We analyze the complexities of the estimators and compare the mean square error (MSE) and symbol error rate (SER) over frequency-selective fading channels. It is shown that the low-pass interpolation-based estimation gives the lowest complexity among the three estimators, but its performance is not so good as the other two. The estimator based on parametric channel modeling is simpler than MLE with slightly better performance.","PeriodicalId":237858,"journal":{"name":"International Conference on Communication Technology Proceedings, 2003. ICCT 2003.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114504057","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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