Pub Date : 2009-04-05DOI: 10.1109/WCNC.2009.4917644
S. Al-Dharrab, M. Uysal
Although there already exists a rich literature on cooperative diversity, current results are mainly restricted to the conventional assumption of additive white Gaussian noise (AWGN). AWGN model realistically represents the thermal noise at the receiver, but ignores the impulsive nature of atmospheric noise, electromagnetic interference, or man-made noise which might be dominant in many practical applications. In this paper, we investigate the performance of cooperative communication over Rayleigh fading channels in the presence of impulsive noise modeled by Middleton Class A noise. Specifically, we consider a multi-relay network with amplify-and-forward relaying. Through the derivations of the pairwise error probability, we quantify the diversity advantages. Based on the minimization of a union bound on the error rate performance, we formulate optimal power allocation schemes and demonstrate significant performance gains over their counterparts with equal power allocation. An extensive Monte Carlo simulation is also presented to illustrate the performance of cooperative schemes in various impulsive environments.
{"title":"Cooperative Diversity over Fading Channels with Impulsive Noise","authors":"S. Al-Dharrab, M. Uysal","doi":"10.1109/WCNC.2009.4917644","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917644","url":null,"abstract":"Although there already exists a rich literature on cooperative diversity, current results are mainly restricted to the conventional assumption of additive white Gaussian noise (AWGN). AWGN model realistically represents the thermal noise at the receiver, but ignores the impulsive nature of atmospheric noise, electromagnetic interference, or man-made noise which might be dominant in many practical applications. In this paper, we investigate the performance of cooperative communication over Rayleigh fading channels in the presence of impulsive noise modeled by Middleton Class A noise. Specifically, we consider a multi-relay network with amplify-and-forward relaying. Through the derivations of the pairwise error probability, we quantify the diversity advantages. Based on the minimization of a union bound on the error rate performance, we formulate optimal power allocation schemes and demonstrate significant performance gains over their counterparts with equal power allocation. An extensive Monte Carlo simulation is also presented to illustrate the performance of cooperative schemes in various impulsive environments.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"270 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115599569","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917783
J. Nishioka, S. Yamano, Katsuhiko Yamada
With the popularity of mobile communication, the importance of backbone network of the mobile networks, i.e. mobile backhaul networks, has increased significantly. With the decreasing size of mobile network system cells, it is considered next-generation mobile backhaul networks will be mesh-based. To reduce the operating expenses, i.e. OPEX, of the network, mobile network carriers are beginning to shift their circuit-switched networks to packet-switched networks. Most mobile backhaul networks are formed with microwave radios. To increase data rate, Adaptive Modulation and Coding (AMC) is used for wireless links. As a result, the data rate of each wireless link changes over time and thus leads to unexpected packet loss or traffic degradation. This paper proposes a routing scheme and methods for estimating the transmission parameters or modes of wireless links to route bandwidth guaranteed flows over mobile backhaul networks. With estimation methods, degradation of existing flows caused by unexpected changes in the data rate of wireless links can be reduced. This paper shows using mode history of link to estimate the link quality can route bandwidth guaranteed flows efficiently by choosing more stable links for the path. We also show that link estimation methods are effective when mode distribution follows normal, uniform and Poisson distributions.
{"title":"Link Estimation Methods for Routing over FWA Mesh Network","authors":"J. Nishioka, S. Yamano, Katsuhiko Yamada","doi":"10.1109/WCNC.2009.4917783","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917783","url":null,"abstract":"With the popularity of mobile communication, the importance of backbone network of the mobile networks, i.e. mobile backhaul networks, has increased significantly. With the decreasing size of mobile network system cells, it is considered next-generation mobile backhaul networks will be mesh-based. To reduce the operating expenses, i.e. OPEX, of the network, mobile network carriers are beginning to shift their circuit-switched networks to packet-switched networks. Most mobile backhaul networks are formed with microwave radios. To increase data rate, Adaptive Modulation and Coding (AMC) is used for wireless links. As a result, the data rate of each wireless link changes over time and thus leads to unexpected packet loss or traffic degradation. This paper proposes a routing scheme and methods for estimating the transmission parameters or modes of wireless links to route bandwidth guaranteed flows over mobile backhaul networks. With estimation methods, degradation of existing flows caused by unexpected changes in the data rate of wireless links can be reduced. This paper shows using mode history of link to estimate the link quality can route bandwidth guaranteed flows efficiently by choosing more stable links for the path. We also show that link estimation methods are effective when mode distribution follows normal, uniform and Poisson distributions.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115839798","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917964
Christian M. Mueller, Lutz Ewe, R. Sigle
Increasing bandwidth demand from mobile Internet applications and the existence of 2G, 3G and soon 4G equipment in operators' networks forces them to implement an efficient resource management over all available radio access technologies. While such a multi-radio management will certainly improve resource utilization and allows reducing local hot spots, it comes at the cost of additional signaling load. In this work, we present an analysis of the signaling requirements of a multiradio management in the fixed part of an operator's network. The signaling load for multi-radio access selection in different system architectures and for different signaling concepts is evaluated, quantified and compared. This analysis permits to conclude on the best-suited implementation strategy for co-located GSM, UMTS and LTE networks.
{"title":"Signaling Analysis for Multi-Radio Management","authors":"Christian M. Mueller, Lutz Ewe, R. Sigle","doi":"10.1109/WCNC.2009.4917964","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917964","url":null,"abstract":"Increasing bandwidth demand from mobile Internet applications and the existence of 2G, 3G and soon 4G equipment in operators' networks forces them to implement an efficient resource management over all available radio access technologies. While such a multi-radio management will certainly improve resource utilization and allows reducing local hot spots, it comes at the cost of additional signaling load. In this work, we present an analysis of the signaling requirements of a multiradio management in the fixed part of an operator's network. The signaling load for multi-radio access selection in different system architectures and for different signaling concepts is evaluated, quantified and compared. This analysis permits to conclude on the best-suited implementation strategy for co-located GSM, UMTS and LTE networks.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"393 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115915397","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917938
R. Kosar, E. Onur, Cem Ersoy
Environmental factors such as unavoidable physical constraints, intentional destruction of the sensors or asymmetric load distribution will lead to formation of holes in the wireless sensor networks. Holes hinder the operational quality of the network, where earlier formations have higher impact. In this paper, we study the sensing hole problem and propose a redeployment method to mitigate it. Image processing algorithms are used for identifying the sensing holes. A portion of the sensors are kept as spare; after identifying the holes, they are redeployed over the holes. The results indicate that the method leads to a considerable increase on the sustainable sensing quality of the network.
{"title":"Redeployment Based Sensing Hole Mitigation in Wireless Sensor Networks","authors":"R. Kosar, E. Onur, Cem Ersoy","doi":"10.1109/WCNC.2009.4917938","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917938","url":null,"abstract":"Environmental factors such as unavoidable physical constraints, intentional destruction of the sensors or asymmetric load distribution will lead to formation of holes in the wireless sensor networks. Holes hinder the operational quality of the network, where earlier formations have higher impact. In this paper, we study the sensing hole problem and propose a redeployment method to mitigate it. Image processing algorithms are used for identifying the sensing holes. A portion of the sensors are kept as spare; after identifying the holes, they are redeployed over the holes. The results indicate that the method leads to a considerable increase on the sustainable sensing quality of the network.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124386421","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917761
Mahmudur Rahman, H. Yanikomeroglu, W. K. Wong
The investigation of co-channel interference mitigation techniques (such as, interference cancellation through receiver processing, interference randomization by frequency hopping, and interference avoidance through resource usage restrictions imposed by frequency and power planning) has become a key focus area in achieving dense spectrum reuse in next generation cellular systems such as 3GPP LTE, LTEadvanced, and WiMAX. In this paper, we propose an interference avoidance scheme for LTE downlink that uses dynamic inter-cell coordination facilitated through X2 interface among neighbouring evolved UTRAN nodeBs (eNBs, i.e., LTE base stations). Proposed scheme is evaluated by extensive simulations and compared with a number of reference schemes available in the literature. It has been observed that the proposed scheme attains superior performance in terms of cell-edge and sector throughput compared to those in the reference schemes.
{"title":"Interference Avoidance with Dynamic Inter-Cell Coordination for Downlink LTE System","authors":"Mahmudur Rahman, H. Yanikomeroglu, W. K. Wong","doi":"10.1109/WCNC.2009.4917761","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917761","url":null,"abstract":"The investigation of co-channel interference mitigation techniques (such as, interference cancellation through receiver processing, interference randomization by frequency hopping, and interference avoidance through resource usage restrictions imposed by frequency and power planning) has become a key focus area in achieving dense spectrum reuse in next generation cellular systems such as 3GPP LTE, LTEadvanced, and WiMAX. In this paper, we propose an interference avoidance scheme for LTE downlink that uses dynamic inter-cell coordination facilitated through X2 interface among neighbouring evolved UTRAN nodeBs (eNBs, i.e., LTE base stations). Proposed scheme is evaluated by extensive simulations and compared with a number of reference schemes available in the literature. It has been observed that the proposed scheme attains superior performance in terms of cell-edge and sector throughput compared to those in the reference schemes.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114419344","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917613
S. Muhaidat, M. Uysal, R. Adve
In this paper, we investigate the performance of a single-relay cooperative scenario where the source, relay, and destination terminals are equipped with multiple transmit/receive antennas. We particularly focus on the so-called blind amplify-and-forward relaying in which the availability of channel state information at the relay terminal is not required. Through the derivation of pairwise error probability, we quantify analytically the impact of multiple antenna deployment assuming various scenarios which involve relay location and power allocation assumptions imposed on the cooperating nodes.
{"title":"Blind Amplify-and-Forward Relaying in Multiple-Antenna Relay Networks","authors":"S. Muhaidat, M. Uysal, R. Adve","doi":"10.1109/WCNC.2009.4917613","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917613","url":null,"abstract":"In this paper, we investigate the performance of a single-relay cooperative scenario where the source, relay, and destination terminals are equipped with multiple transmit/receive antennas. We particularly focus on the so-called blind amplify-and-forward relaying in which the availability of channel state information at the relay terminal is not required. Through the derivation of pairwise error probability, we quantify analytically the impact of multiple antenna deployment assuming various scenarios which involve relay location and power allocation assumptions imposed on the cooperating nodes.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114501684","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917671
Ilker Onat, A. Miri
This paper introduces a new medium access control (MAC) protocol for passive Radio Frequency Identification (RFID) systems. The protocol is designed as an enhancement to framed slotted ALOHA MAC protocols in which tags randomly select a slot number on a given frame size. As shown in this paper, the completely random slot selection in the framed slotted ALOHA systems is not the optimum approach to the slot selection problem. To minimize the collision probability, our protocol, named Distance Based Slot Selection (DiSEL), uses a crosslayer approach for tags to select the most appropriate time slot in a given frame. A tag in DiSEL uses the maximum and minimum received power levels of the reader-tag communications to choose a slot number. A resonant boosting network to increase the received RF power granularity and an efficient rectifier to convert the RF signal into DC introduced for the power level measurements at the tags. We test DiSEL under various tag deployment and density scenarios and show that DiSEL decreases the tag collision probability in both random uniform and evenly spaced dense tag deployments.
{"title":"DiSEL: A Distance Based Slot Selection Protocol for Framed Slotted ALOHA RFID Systems","authors":"Ilker Onat, A. Miri","doi":"10.1109/WCNC.2009.4917671","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917671","url":null,"abstract":"This paper introduces a new medium access control (MAC) protocol for passive Radio Frequency Identification (RFID) systems. The protocol is designed as an enhancement to framed slotted ALOHA MAC protocols in which tags randomly select a slot number on a given frame size. As shown in this paper, the completely random slot selection in the framed slotted ALOHA systems is not the optimum approach to the slot selection problem. To minimize the collision probability, our protocol, named Distance Based Slot Selection (DiSEL), uses a crosslayer approach for tags to select the most appropriate time slot in a given frame. A tag in DiSEL uses the maximum and minimum received power levels of the reader-tag communications to choose a slot number. A resonant boosting network to increase the received RF power granularity and an efficient rectifier to convert the RF signal into DC introduced for the power level measurements at the tags. We test DiSEL under various tag deployment and density scenarios and show that DiSEL decreases the tag collision probability in both random uniform and evenly spaced dense tag deployments.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114798966","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917825
Henning Vetter, V. Ponnampalam
An improvement to lattice-reduction-aided (LRA) vector perturbation precoding for multi-user MIMO downlink is introduced. Closest lattice point approximation by means of lattice reduction techniques can significantly lower the complexity of the closest point search compared to using a sphere encoder, but the performance of the system is also impaired. In this paper, we propose a new technique improving the suboptimal LRA closest-point approximation in a subsequent stage. This stage consists of a low-complexity candidate list generation of also likely approximations, and an evaluation step of this list. We present simulation results showing that our improvement to the LRA closest-point approximation can achieve near-optimum performance.
{"title":"Near-Optimum Vector Perturbation Precoding Using a Candidate List","authors":"Henning Vetter, V. Ponnampalam","doi":"10.1109/WCNC.2009.4917825","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917825","url":null,"abstract":"An improvement to lattice-reduction-aided (LRA) vector perturbation precoding for multi-user MIMO downlink is introduced. Closest lattice point approximation by means of lattice reduction techniques can significantly lower the complexity of the closest point search compared to using a sphere encoder, but the performance of the system is also impaired. In this paper, we propose a new technique improving the suboptimal LRA closest-point approximation in a subsequent stage. This stage consists of a low-complexity candidate list generation of also likely approximations, and an evaluation step of this list. We present simulation results showing that our improvement to the LRA closest-point approximation can achieve near-optimum performance.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114533746","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917513
Jun Wang, Keith Q. T. Zhang
Fully exploiting the phase and magnitude information in received data is crucial to the detection of cognitive radio signals, and this is usually done in the time domain. In fact, the same set of information can also be exploited in the frequency domain in the form of power spectrum. The most appealing one is the multitaper spectrum (MTS) estimator, which enjoys a high estimation accuracy and relatively low computational complexity making it an attractive candidate for use in CR networks. In this paper, we investigate a MTS-based CR detector, aiming to fully understand its capability in exploiting the advantage of MTS. We obtain simple expressions for detection probability and constant false-alarm rate whereby a threshold can be easily determined. Numerical results are presented to verify the theory and to demonstrate the superior performance of the proposed scheme.
{"title":"A Multitaper Spectrum Based Detector for Cognitive Radio","authors":"Jun Wang, Keith Q. T. Zhang","doi":"10.1109/WCNC.2009.4917513","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917513","url":null,"abstract":"Fully exploiting the phase and magnitude information in received data is crucial to the detection of cognitive radio signals, and this is usually done in the time domain. In fact, the same set of information can also be exploited in the frequency domain in the form of power spectrum. The most appealing one is the multitaper spectrum (MTS) estimator, which enjoys a high estimation accuracy and relatively low computational complexity making it an attractive candidate for use in CR networks. In this paper, we investigate a MTS-based CR detector, aiming to fully understand its capability in exploiting the advantage of MTS. We obtain simple expressions for detection probability and constant false-alarm rate whereby a threshold can be easily determined. Numerical results are presented to verify the theory and to demonstrate the superior performance of the proposed scheme.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114697411","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 : 2009-04-05DOI: 10.1109/WCNC.2009.4917723
Il-Gu Lee, Jungbo Son, Sok-Kyu Lee
The characterization for the coverage and performance of RF transceiver is an important step in wireless network design. We present that the enhanced receiver sensitivity utilizing an external LNA and improved transmit power can extend the coverage to meet the achievable performance in the real radio environment.
{"title":"Field Test and Experimental Characterization of 5GHz RF Transceivers for Coverage Extension","authors":"Il-Gu Lee, Jungbo Son, Sok-Kyu Lee","doi":"10.1109/WCNC.2009.4917723","DOIUrl":"https://doi.org/10.1109/WCNC.2009.4917723","url":null,"abstract":"The characterization for the coverage and performance of RF transceiver is an important step in wireless network design. We present that the enhanced receiver sensitivity utilizing an external LNA and improved transmit power can extend the coverage to meet the achievable performance in the real radio environment.","PeriodicalId":186150,"journal":{"name":"2009 IEEE Wireless Communications and Networking Conference","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123598067","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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