12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)最新文献

{"title":"A pipeline implementation of linear multiuser detector for asynchronous CDMA systems","authors":"Yueheng Li, Haifeng Wang, Ming Chen, Shixin Cheng","doi":"10.1109/PIMRC.2001.965420","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965420","url":null,"abstract":"The Gauss-Seidel iterative algorithm for linear asynchronous decorrelation or minimum mean square error (MMSE) multiuser detector can be viewed as a kind of linear soft decision feedback multiuser detection. Based on this idea, a linear decorrelating or MMSE detector can be implemented by using a much simpler pipeline structure compared with the conventional scheme of computing the inverse of the corresponding correlation matrix. Through this pipeline structure, a lot of computations can be reduced.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122351710","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":"Effect of service modeling on medium access control performance","authors":"S. Thilakawardana, R. Tafazolli","doi":"10.1109/PIMRC.2001.965462","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965462","url":null,"abstract":"Due to the tractability in analytical methods exponential burst distributions are more common in service modeling literature. However, previous traffic measurements findings argue heavy tailed distributions such as Pareto represents burst sizes in WWW browsing and Cauchy distributed burst sizes in e-mail sessions. The effect of long range dependence (LRD) introduced by these heavy tailed distributions results in self similarity in the aggregate traffic. The impact of self similarity is significant in the area of queue delay performance characteristics. This work addresses the issues of service modeling in medium access control (MAC) performance compared to traditional exponential session distributions against the above mentioned distributions in WWW browsing and e-mail sessions applied to an example GPRS MAC system. The results conclude high delay in Cauchy e-mail connection sizes and Pareto WWW burst sessions compared to exponential connections/bursts. Also, once looking in to the matter it can be seen that this delay is mainly due to the congestion caused by different types of bursts/connection distributions. Therefore the bursty traffic such as WWW browsing which demonstrates self similarity at the aggregate level influence the MAC protocol performance greater than in traditional traffic models.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126477738","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":"Reduction of signaling on cellular systems with mobile agents: the POP3 application","authors":"L. Perato, K. A. Agha","doi":"10.1109/PIMRC.2001.965398","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965398","url":null,"abstract":"Current cellular systems suffer already from signaling that uses the air interface resource. For example, in GSM systems, half of the available resources is dedicated for common and dedicated signaling. For future generations, systems will propose more services with QoS requirements. This increases the quantity of control information on the radio interface. In this paper, we propose a mobile agent based framework in order to reduce the number of signaling requests between the terminal and its base station. A POP3 application was used to illustrate the performance of the framework.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126620046","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":"An efficient method for high-rate data transmission using residue number system based DS-CDMA","authors":"A. Madhukumar, F. Chin","doi":"10.1109/PIMRC.2001.965450","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965450","url":null,"abstract":"This paper presents an advanced architecture for a residue number system (RNS) based CDMA system for high-rate data transmission by combining RNS representation, PSK/QAM modulation and orthogonal modulation. The proposed system uses a lesser spreading factor than RNS based CDMA and the performance is comparable. The modified system is simulated extensively for different channel conditions and found that it can be used for faster data transmission without affecting the system performance.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121039083","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":"Near far self resistant CDMA wireless network","authors":"S. Glisic, Z. Nikolic, N. Milosevic, Fan Wang","doi":"10.1109/PIMRC.2001.965454","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965454","url":null,"abstract":"We introduce a new concept of multiple access called /spl tau/-CDMA. The abbreviation stands for code division multiple access with delay (or) modulation and hopping. The concept is based on a modification of direct sequence spread spectrum (DSSS) system where transmitted waveform includes multiple amplitude and delay replicas of DSSS signal. In general notation amM/spl tau/-DSDH is used for the DS signal that includes m delayed (/spl tau/) replicas of different amplitudes (a), sent in a limited delay window of M chip intervals. The position of the delay window is hopped (delay hopping-DH) in the range of the code length N. This provides resistance to near far effect without the need for complex multiuser detectors. The variable impacts of the near far effect, for different positions of the delay window and fading, are simultaneously reduced by interleaving. If the signal energy is split to m>1 separate components, making it more vulnerable to noise and fading, the overall flow of useful information will be still increased. The results demonstrate that under the large range of the signal, channel and interference parameters this system offers better performance. This system combines the good characteristics of DSSS and FHSS systems. The near far effect is mitigated without need for complicated multiuser detectors and at the same time the simplicity of the DSSS system is preserved. There is no need for a frequency synthesizer. The coherency for coherent RAKE reception is maintained in a much simpler way than in the FH system. Higher suppression of the multipath component is achieved than in a standard DSSS system. For the above signal formats this paper offers a number of receiver configurations ranging from very simple to more complex ones providing better and better performance. The application is energy aware software radio where a configuration control algorithm would chose the simplest configuration in order to provide the required QoS for the given environment with the minimum processing power resulting in minimum energy consumption.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121175163","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":"Base station transceiver trends for 3G and beyond wireless systems","authors":"D. Efstathiou","doi":"10.1109/PIMRC.2001.965443","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965443","url":null,"abstract":"The general trend of wireless wideband transceivers points to continuing reduction of radio frequency processing at the expense of increased digital signal processing making the move towards software defined radio (SDR). The SDR concept enables the necessary flexibility for existing and next generation wireless systems. The development of cost efficient data converters and digital IF signal processors is called upon to play a crucial role in the concept of software radio transceivers. This paper presents a view and a solution for flexible software radio base station architectures for major digital wireless standards.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131614238","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":"On multicriteria optimization of cellular networks","authors":"K. Lieska, E. Laitinen","doi":"10.1109/PIMRC.2001.965390","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965390","url":null,"abstract":"In this paper we propose a new method in order to replace the traditional network planning procedure. The new method is based on optimization of multicriteria, binomial objective function. The constraints of the objective function are formulated using a penalty method and genetic algorithms are used for solving the optimization problem. Numerical examples are presented in order to demonstrate the proper operation of the proposed method. An application to solve network planning problems in urban areas is presented.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132927013","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":"Iterative multiuser detection and decoding for coded CDMA in frequency-selective fading channels","authors":"H. Farmanbar, M. Nasiri-Kenari","doi":"10.1109/PIMRC.2001.965382","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965382","url":null,"abstract":"A receiver structure, which his linear computational complexity with the number of users, is proposed for decoding multiuser information data in a convolutionally coded asynchronous DS-CDMA system in multipath fading channels. The proposed receiver architecture consists of a multiuser likelihood calculator followed by a bank of soft-input soft-output (SISO) channel decoders. Information is fed back from SISO channel decoders to multiuser likelihood calculator, and the processing proceeds in an iterative fashion analogous to the decoding of turbo codes. A simplification to the above receiver structure is given also. Simulation results demonstrate that, for both receiver structures, at high signal-to-noise ratios (SNR), both multiple-access interference (MAI) and intersymbol interference (ISI) are efficiently suppressed, and single-user performance is approached. Furthermore, the proposed iterative receivers are near-far resistant.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133739050","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":"An antenna solution for MIMO channels: the switched parasitic antenna","authors":"M. Wennström, T. Svantesson","doi":"10.1109/PIMRC.2001.965412","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965412","url":null,"abstract":"We investigate the switched parasitic antenna (SPA), which is a novel technique for electronically directing the radiation pattern in a MIMO system. The correlation between the received signal modes is shown to be sufficiently low to yield a diversity gain. The capacity limit using the SPA is investigated for different SPA configurations and it is found that the capacity is comparable with an array antenna configuration in certain situations. Finally, a space time block coding scheme is used to evaluate the bit error rate of a MIMO-SPA system. It is found that the SPA requires a 5 dB higher SNR than an antenna array solution to achieve a BER=10/sup -2/. However, the array antenna requires a radio transceiver for every antenna, as opposed to the SPA which uses only one transceiver.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134513339","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":"Balancing public and private in fourth generation","authors":"J. Pereira","doi":"10.1109/PIMRC.2001.965333","DOIUrl":"https://doi.org/10.1109/PIMRC.2001.965333","url":null,"abstract":"In spite of timid steps towards accommodating some type of private (in fact, corporate) usage, current and past mobile generations - from first (1G) to third (3G) - are focused on public use. However, as 3G networks are (to be) deployed on top of existing second generation (2G) networks, with IP becoming ever more pervasive, and with the advent of reconfigurable radio, the opportunity is there, looking forward towards fourth generation (4G), to really start focusing on private, unlicensed use at par with the envisioned use of 4G systems as an extension of existing public systems. Indeed, our perspective of 4G is not one of only higher data rates and a public service focus (that was from the start the perspective for 3G-Phase 2, what some call IMT-2010). What is at stake is a different concept of service, more than yet another technology revolution, and this constitutes a bigger challenge: the focus is now squarely on the user, not on operators/service providers. That said, some aspects of 4G, namely the integration of heterogeneous networks, will provide operators, already in the short term, with essential tools to manage their increasingly complex networks and provide seamless, efficient access to information, ie, to remain competitive.","PeriodicalId":318292,"journal":{"name":"12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598)","volume":"91 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114035427","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}