Pub Date : 2008-12-30DOI: 10.1109/ISWCS.2008.4726121
A. N. Kim, Eren Gürses
Wireless video sensor networks (WVSNs) bring a new set of design challenges due to their specific application requirements in terms of latency, bit rate, and power consumption. In this paper, we propose an application layer power-congestion-distortion (P-C-D) optimized multi-path transmission scheduling algorithm. The algorithm utilizes existing techniques and protocols on the various layers and is designed to minimize the overall transmission power consumption while maintaining a desired level of quality. Simulation results show that optimal tradeoffs can be made between available multiple routes and transmission opportunities. Heuristic approaches can also be applied with much lower complexity without sacrificing much performance.
{"title":"Power-Congestion-Distortion optimized scheduling in Wireless Video Sensor Networks","authors":"A. N. Kim, Eren Gürses","doi":"10.1109/ISWCS.2008.4726121","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726121","url":null,"abstract":"Wireless video sensor networks (WVSNs) bring a new set of design challenges due to their specific application requirements in terms of latency, bit rate, and power consumption. In this paper, we propose an application layer power-congestion-distortion (P-C-D) optimized multi-path transmission scheduling algorithm. The algorithm utilizes existing techniques and protocols on the various layers and is designed to minimize the overall transmission power consumption while maintaining a desired level of quality. Simulation results show that optimal tradeoffs can be made between available multiple routes and transmission opportunities. Heuristic approaches can also be applied with much lower complexity without sacrificing much performance.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114599872","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726138
Hongzhi Jiao, F. Li
Wireless mesh networks will play an important role in the next-generation wireless communication systems as it can provide wide coverage and scalable broadband Internet access services. However, congestion in such networks may lead to throughput degradation, packet loss and longer transmission delay. Therefore, routing and traffic forwarding schemes which are aware of the congestion status of a wireless network can efficiently improve network performance. In this paper, we propose a new congestion-aware routing scheme which may direct different paths for different services types, according to network congestion status. The goal of this routing scheme is to use traffic load metric for choosing a high throughput path for each mesh client towards the most appropriate Internet gateway so that load balancing is achieved among gateways. Simulations based on ns2 are conducted in order to evaluate the performance of the proposed scheme, considering both UDP and TCP traffic classes. We observe that the proposed scheme outperforms the legacy routing scheme in the simulated scenarios.
{"title":"A service-oriented routing scheme with load balancing in wireless mesh networks","authors":"Hongzhi Jiao, F. Li","doi":"10.1109/ISWCS.2008.4726138","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726138","url":null,"abstract":"Wireless mesh networks will play an important role in the next-generation wireless communication systems as it can provide wide coverage and scalable broadband Internet access services. However, congestion in such networks may lead to throughput degradation, packet loss and longer transmission delay. Therefore, routing and traffic forwarding schemes which are aware of the congestion status of a wireless network can efficiently improve network performance. In this paper, we propose a new congestion-aware routing scheme which may direct different paths for different services types, according to network congestion status. The goal of this routing scheme is to use traffic load metric for choosing a high throughput path for each mesh client towards the most appropriate Internet gateway so that load balancing is achieved among gateways. Simulations based on ns2 are conducted in order to evaluate the performance of the proposed scheme, considering both UDP and TCP traffic classes. We observe that the proposed scheme outperforms the legacy routing scheme in the simulated scenarios.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124445353","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726140
H. Hernández, C. Blum
In wireless ad-hoc networks, where nodes are often equipped with batteries, energy is a scarce resource. Therefore, power consumption of network operations is critical and subject to optimization. One of the fundamental problems in ad-hoc networks is multicasting. In this work we consider the so-called minimum energy multicast (MEM) problem, which can be stated as a combinatorial optimization problem. We develop an ant colony optimization metaheuristic for networks with omni-directional and directional antennas. The results show that our algorithm consistently outperforms existing techniques.
{"title":"Energy-efficient multicasting in wireless ad-hoc networks: An ant colony optimization approach","authors":"H. Hernández, C. Blum","doi":"10.1109/ISWCS.2008.4726140","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726140","url":null,"abstract":"In wireless ad-hoc networks, where nodes are often equipped with batteries, energy is a scarce resource. Therefore, power consumption of network operations is critical and subject to optimization. One of the fundamental problems in ad-hoc networks is multicasting. In this work we consider the so-called minimum energy multicast (MEM) problem, which can be stated as a combinatorial optimization problem. We develop an ant colony optimization metaheuristic for networks with omni-directional and directional antennas. The results show that our algorithm consistently outperforms existing techniques.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123907177","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726116
Y. Kishino, Yasushi Sakurai, Koji Kamei, Y. Yanagisawa, T. Maekawa, T. Okadome
The method proposed here gathers data in high- density wireless sensor networks in real-time. It determines network topology by hierarchical clustering to avoid radio collision, which enables us to gather data with minimum data latency from numerous high-density sensor nodes. The analysis of our proposed tree-based data gathering protocol and real experiments using 39 real sensor nodes show that the proposed data gathering method can reduce data latency by hierarchical clustering.
{"title":"Data gathering in high-density wireless sensor networks using hierarchical clustering","authors":"Y. Kishino, Yasushi Sakurai, Koji Kamei, Y. Yanagisawa, T. Maekawa, T. Okadome","doi":"10.1109/ISWCS.2008.4726116","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726116","url":null,"abstract":"The method proposed here gathers data in high- density wireless sensor networks in real-time. It determines network topology by hierarchical clustering to avoid radio collision, which enables us to gather data with minimum data latency from numerous high-density sensor nodes. The analysis of our proposed tree-based data gathering protocol and real experiments using 39 real sensor nodes show that the proposed data gathering method can reduce data latency by hierarchical clustering.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125324559","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726010
Adrian Kliks, H. Bogucka
In this paper, the peak-to-average power ratio (PAPR) metric and other metrics reflecting nonlinear distortions caused by a nonlinear element are presented. To avoid the drawbacks and ambiguity of some well-known frequently quoted metrics an attempt to reveal the influence of nonlinear elements on the transmitted signal is made, what leads to more reliable assessment of the phenomena of the occurrence of nonlinear distortions more precisely. The accuracy, performance analysis and application of the proposed metrics are discussed with regard to the OFDM signals.
{"title":"New metrics reflecting the nonlinear distortions in OFDM transmission","authors":"Adrian Kliks, H. Bogucka","doi":"10.1109/ISWCS.2008.4726010","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726010","url":null,"abstract":"In this paper, the peak-to-average power ratio (PAPR) metric and other metrics reflecting nonlinear distortions caused by a nonlinear element are presented. To avoid the drawbacks and ambiguity of some well-known frequently quoted metrics an attempt to reveal the influence of nonlinear elements on the transmitted signal is made, what leads to more reliable assessment of the phenomena of the occurrence of nonlinear distortions more precisely. The accuracy, performance analysis and application of the proposed metrics are discussed with regard to the OFDM signals.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"207 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126188145","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726059
Myunghwan Seo, Yonggyu Kim, Joongsoo Ma
Multi-channel MAC protocols are proposed to increase the capacity of wireless network. However, dynamic channel selection mechanism based on channel usage information from one-hop neighbor nodes causes multi-channel hidden node problems in a multi-channel multi-hop wireless network. In this paper, we propose a new approach of channel selection. Nodes snoop data channels during idle times and then select an idle data channel within the carrier sensing range by using both the snooping results and the channel usage information. Our simulation results verify that the proposed channel selection approach can effectively avoid the multi-channel hidden node problem and improve the networkwide performance.
{"title":"A multi-channel MAC protocol with snooping for multi-hop wireless nmetworks","authors":"Myunghwan Seo, Yonggyu Kim, Joongsoo Ma","doi":"10.1109/ISWCS.2008.4726059","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726059","url":null,"abstract":"Multi-channel MAC protocols are proposed to increase the capacity of wireless network. However, dynamic channel selection mechanism based on channel usage information from one-hop neighbor nodes causes multi-channel hidden node problems in a multi-channel multi-hop wireless network. In this paper, we propose a new approach of channel selection. Nodes snoop data channels during idle times and then select an idle data channel within the carrier sensing range by using both the snooping results and the channel usage information. Our simulation results verify that the proposed channel selection approach can effectively avoid the multi-channel hidden node problem and improve the networkwide performance.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129396766","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726057
J. Penttinen
The typical radiating power levels of the DVB-H sites are normally between the values used in mobile and television broadcast networks. It is thus important to take into account accordingly the EMC (Electro Magnetic Compatibility) as well as the human exposure limits in the DVB-H transmission facilities. This paper presents a practical method for estimating the safety limits of human exposure and EMC in different DVB-H installation environments. Furthermore, case studies are presented for the most typical environments.
{"title":"DVB-H radiation aspects","authors":"J. Penttinen","doi":"10.1109/ISWCS.2008.4726057","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726057","url":null,"abstract":"The typical radiating power levels of the DVB-H sites are normally between the values used in mobile and television broadcast networks. It is thus important to take into account accordingly the EMC (Electro Magnetic Compatibility) as well as the human exposure limits in the DVB-H transmission facilities. This paper presents a practical method for estimating the safety limits of human exposure and EMC in different DVB-H installation environments. Furthermore, case studies are presented for the most typical environments.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130935118","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726104
M. Alamgir, M. Faulkner, Jason H. Gao, P. Conder
Cognitive radio (CR) is currently being seen as the future for wireless communications. Fundamental to the operation of a CR is the detection of presence of legacy communication. Energy detector (ED) is a simple and effective signal sensing method. However, the ED requires accurate estimation of the noise power. Any error in the estimation, which is common in practice, affects its performance. In this study we have looked at the detection problem using an antenna array. Under noise only case, the array covariance matrix has reasonably equal eigenvalues. On the other hand when a signal is present, the strongest eigenvalue is dissimilar to the rest. To measure the equality of the eigenvalues we use the sphericity test. We have found that under realistic assumptions about noise uncertainty and signal correlation the array based sphericity method of signal detection can perform better than the ED. Also, unlike the ED the sphericity test does not require any estimation of the noise power.
{"title":"Signal detection for cognitive radio using multiple antennas","authors":"M. Alamgir, M. Faulkner, Jason H. Gao, P. Conder","doi":"10.1109/ISWCS.2008.4726104","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726104","url":null,"abstract":"Cognitive radio (CR) is currently being seen as the future for wireless communications. Fundamental to the operation of a CR is the detection of presence of legacy communication. Energy detector (ED) is a simple and effective signal sensing method. However, the ED requires accurate estimation of the noise power. Any error in the estimation, which is common in practice, affects its performance. In this study we have looked at the detection problem using an antenna array. Under noise only case, the array covariance matrix has reasonably equal eigenvalues. On the other hand when a signal is present, the strongest eigenvalue is dissimilar to the rest. To measure the equality of the eigenvalues we use the sphericity test. We have found that under realistic assumptions about noise uncertainty and signal correlation the array based sphericity method of signal detection can perform better than the ED. Also, unlike the ED the sphericity test does not require any estimation of the noise power.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130165424","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726103
Wei Chen, Qinye Yin, Aigang Feng
In smart antenna downlink systems, the beamforming is severely affected by antenna gain and phase mismatch as well as mutual coupling effects. We propose an eigen-structure based approach to estimate the gain and phase of each antenna sensor and mutual coupling coefficients between antenna sensors. By preprocessing the transmission signal in base station with the estimated parameters, the gain and phase mismatch and mutual coupling effects are compensated. Simulation results with data collected from a smart antenna test bed show that the estimation error is less than 5% and correct beam pattern is obtained.
{"title":"Array calibration for compensating gain/phase mismatch and mutual coupling effects in Smart Antenna Systems","authors":"Wei Chen, Qinye Yin, Aigang Feng","doi":"10.1109/ISWCS.2008.4726103","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726103","url":null,"abstract":"In smart antenna downlink systems, the beamforming is severely affected by antenna gain and phase mismatch as well as mutual coupling effects. We propose an eigen-structure based approach to estimate the gain and phase of each antenna sensor and mutual coupling coefficients between antenna sensors. By preprocessing the transmission signal in base station with the estimated parameters, the gain and phase mismatch and mutual coupling effects are compensated. Simulation results with data collected from a smart antenna test bed show that the estimation error is less than 5% and correct beam pattern is obtained.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122101513","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 : 2008-12-30DOI: 10.1109/ISWCS.2008.4726115
J. Geldmacher, K. Hueske, J. Götze
A block processing approach for decoding of convolutional codes is proposed. The approach is based on the fact that it is possible for Scarce-State-Transition decoding and syndrome decoding to determine the probability of a certain trellis state before the actual decoding happens. This allows the separation of the received sequence into independant blocks with known initial and final states, thus making overlapping or modifications of the encoder or the information stream unnecessary. The proposed scheme offers potentials for both parallelization and reduction of power consumption.
{"title":"Syndrome based block decoding of convolutional codes","authors":"J. Geldmacher, K. Hueske, J. Götze","doi":"10.1109/ISWCS.2008.4726115","DOIUrl":"https://doi.org/10.1109/ISWCS.2008.4726115","url":null,"abstract":"A block processing approach for decoding of convolutional codes is proposed. The approach is based on the fact that it is possible for Scarce-State-Transition decoding and syndrome decoding to determine the probability of a certain trellis state before the actual decoding happens. This allows the separation of the received sequence into independant blocks with known initial and final states, thus making overlapping or modifications of the encoder or the information stream unnecessary. The proposed scheme offers potentials for both parallelization and reduction of power consumption.","PeriodicalId":158650,"journal":{"name":"2008 IEEE International Symposium on Wireless Communication Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126554854","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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