N. Sagias, G. Karagiannidis, D. A. Zogas, P. Mathiopoulos, G. Tombras, F. Pavlidou
{"title":"Second order statistics and channel spectral efficiency for selection diversity receivers in Weibull fading","authors":"N. Sagias, G. Karagiannidis, D. A. Zogas, P. Mathiopoulos, G. Tombras, F. Pavlidou","doi":"10.1109/PIMRC.2004.1368376","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368376","url":null,"abstract":"Motivated by the suitability of the Weibull distribution to model multipath fading channels, the second order statistics and the spectral efficiency (SE) of L-branch SC receivers are studied. Deriving a novel closed-form expression for the probability density function (pdf) of the SC output SNR, the average level crossing rate (LCR), the average fade duration (AFD) and the Shannon's average SE, at the output of the SC, are derived in closed-forms. Our results are sufficiently general to handle arbitrary fading parameter and dissimilar branch powers.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125755015","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":"Fairness measures for best effort traffic in wireless networks","authors":"K. Norlund, T. Ottosson, A. Brunström","doi":"10.1109/PIMRC.2004.1368861","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368861","url":null,"abstract":"This paper proposes that fairness in wireless networks should be measured using one of the following new measures: the deterministic unfairness bound called the wireless absolute fairness bound (WAFB) or the statistical unfairness bound called the 99-percentile wireless absolute fairness bound (WAFB/sub 99/). Compared with previous fairness definitions, the new fairness measures are better suited for measuring fairness of scheduling disciplines that exploit multiuser diversity. A new scheduling discipline called opportunistic proportional fair scheduling is defined. Numerical results show that the new scheduling discipline has slightly higher throughput and slightly better fairness than proportional fair scheduling.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124685277","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":"Impact of indoor traffic on W-CDMA capacity","authors":"J. Pérez-Romero, O. Sallent, R. Agustí","doi":"10.1109/PIMRC.2004.1368843","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368843","url":null,"abstract":"The role of indoor traffic in 3G mobile communication networks will be even more important than in 2G since many of the expected multimedia high bit rate services will be originated inside buildings. In case of W-CDMA based 3G networks, the importance will be even higher because of the power based management in the radio interface. In this context, This work presents a model to assess the impact of indoor traffic over uplink cell capacity in different scenarios. As a result, it provides enough information to the network operator to decide how important is in every scenario to make the transition from outdoor macrocells to micro and picocells.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124746530","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":"Impact of the users' distribution on the IEEE 802.11a MAC protocol fairness and performance","authors":"Jean-Christophe Dunat, L. Elicegui, C. Bonnet","doi":"10.1109/PIMRC.2004.1370888","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1370888","url":null,"abstract":"The IEEE 802.11a technology is rapidly being deployed offering many advantages to users. However, the MAC protocol suffers problems, due to such as hidden nodes and capture effects, leading to degraded performance. The article investigates the impact of the users' distribution (uniform and micro-cluster) on the protocol fairness and performance.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128487958","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-demand QoS multicast routing and reservation protocol for MANETs","authors":"J. M. Ng, C. Low, Hui Seong. Teo","doi":"10.1109/PIMRC.2004.1368771","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368771","url":null,"abstract":"We proposed a routing and resource reservation protocol that support both unicasting and multicasting for mobile ad hoc network (MANET). Unlike the wired network where the network topology is rather static, the topology of a MANET changes regularly depending on the mobility of the network nodes. Hence, integrating the resource reservation protocol into an on-demand routing protocol would be an efficient means to search for a path with the required bandwidth. Resources are temporarily reserved on the feasible paths during the path searching, and are committed only when the path is selected. Two reservation styles are supported which allow the sharing of resources by multiple data sources if needed.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128633020","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":"Transmitter and receiver designs for the MIMO fading broadcast channel","authors":"R. Doostnejad, Teng Joon Lim, E. Sousa","doi":"10.1109/PIMRC.2004.1373878","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1373878","url":null,"abstract":"We study the downlink of a MIMO multi-user system when no information about the channel is assumed at the transmitter. Instead of applying direct-sequence code-division multiple access (DS-CDMA) over the codewords of conventional space-time coding (STC) schemes, a modulation technique that can be seen as two-dimensional space-time spreading (2D-STSC) is described. It is based on well-known Walsh codes, provides full transmit diversity and high spectral efficiency, and produces groups of users that are orthogonal to each other. This last point translates into simplified detection strategies without loss of performance. The main detector structure of interest is a two-stage interference canceller which employs serial interference cancellation (SIC) in the first stage. We will demonstrate that in conjunction with an unequal power allocation scheme, this receiver is able to provide full diversity and suffers from only a small performance loss compared to the full-complexity maximum likelihood receiver. The proposed scheme compares favorably with related ones in terms of spectral efficiency, bit error probability, and complexity at the receiver.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127511140","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":"Spectrum pricing for excess bandwidth in radio networks","authors":"F. Capar, F. Jondral","doi":"10.1109/PIMRC.2004.1368762","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368762","url":null,"abstract":"Radio networks are designed to guarantee quality of service (QoS). This QoS guarantee is offered for customers with time varying load characteristics. Since the peak to average load of a network is usually very high the network utilizes the maximum capacity only for a fraction of time. Radio spectrum is a scarce resource and radio network providers pay huge amounts of money for licenses. For this reason applications with high QoS requirements are usually very expensive. For a better subscriber satisfaction the price for QoS should be as low as possible. From an economic perspective (X. R. et al., 2002), (U. Savagoankar et al.) the excess bandwidth could be disposed of in a secondary market. This would mean additional profit and by lowering the price for primary users the user satisfaction will increase. Surely there will be an optimum pricing strategy to maximize the profit. As a matter of fact, the QoS which can be offered in the secondary market is lower than the QoS which is offered in the primary market. In This work we will model a network which offers high QoS services to primary users and low QoS services for secondary users. The primary user applications are not queued whereas the secondary user applications are queued. Our focus is on a spectrum band at a dedicated frequency which is shared using a TDMA access scheme. We will model the traffic as Poisson arrival processes. Since the achievable QoS depends on the queue state of the network a state dependent pricing scheme for services in the secondary market will be applied. An acceptance function will characterize the behavior of the users in the secondary market.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128942553","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}
S. Tsumura, Mikko Vehkaperä, Zexian Li, D. Tujkovic, M. Juntti, S. Hara
{"title":"Performance evaluation of turbo and space-time turbo coded MC-CDMA downlink in multi-cell environment","authors":"S. Tsumura, Mikko Vehkaperä, Zexian Li, D. Tujkovic, M. Juntti, S. Hara","doi":"10.1109/PIMRC.2004.1368731","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368731","url":null,"abstract":"We evaluate the performance of single- and multi-antenna multi-carrier code division multiple access (MC-CDMA) downlink (base station to mobile terminal) systems in multi-cell environments. We first propose a minimum mean square error (MMSE) filter for a single input single output (SISO) MC-CDMA downlink system. Then, we apply it to a SIMO (single input multiple output) system with a conventional turbo coding. Furthermore, we compare the performance of SISO (1 /spl times/ 1) and SIMO (1 /spl times/ 2) MC-CDMA systems with that of a multiple input multiple output (MIMO) (2 /spl times/ 2) system employing space-time turbo coded modulation (STTuCM) in a multi-cell environment with 7 cells by computer simulation. Based on the computer simulation results, it is found that the considered MIMO system can achieve twofold capacity with the same transmission power in the multi-cell environment.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128952292","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":"Dynamic and efficient tuning of IEEE 802.11 for multimedia applications","authors":"F. Filali","doi":"10.1109/PIMRC.2004.1373831","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1373831","url":null,"abstract":"In order to exploit the properties of multimedia applications in IEEE 802.11-based wireless networks in more appropriate ways, we interest in the dynamic and efficient tuning of the MAC protocol by taking into account the inherent characteristics of this kind of applications. We focus on the try limit parameter used at the 802.11 MAC layer to limit the number of retransmissions of a data frame by a source until the reception of a link-level acknowledgment from the destination. Based on analytical preliminaries, we determine the optimal value of this parameter in order to achieve an expected average end-to-end delay or a maximum packet loss rate. Moreover, an approximated value of the try limit parameter optimizing both QoS criteria (delay and packet loss rate) could also be obtained. Furthermore, these values are approximated dynamically using a simple algorithm that is easily implementable in 802.11 protocol.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129164391","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 sequential algorithm for optimal base stations location in a mobile radio network","authors":"R. Chávez-Santiago, V. Lyandres","doi":"10.1109/PIMRC.2004.1368849","DOIUrl":"https://doi.org/10.1109/PIMRC.2004.1368849","url":null,"abstract":"In this article we propose an algorithm for the optimal location of base stations in a mobile radio network. This task is a very complex combinatorial problem since many constraints and requirements must be satisfied. The proposed algorithm locates base stations in a traffic adapted manner, which means that base stations are concentrated inside traffic hotspots and are sparsely distributed in zones with lower traffic demand. It also assigns to all base stations practically the same traffic load, which enhances the efficiency of the network and eases the frequency assignment process.","PeriodicalId":201962,"journal":{"name":"2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131038458","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}