Recent advances in embedded systems and mobile technologies are paving the way for the next revolution in computing, Ubiquitous Computing, the future towards which all the current technological developments are heading. Ubiquitous computing has potential applications in several sectors such as healthcare, business processes, disaster mitigation and management, farm land irrigation, and empowering the common man to improve the quality of life. Wireless communication modules and sensors are major building blocks of ubiquitous computing paradigm. As the field of communication networks continues to evolve, a very interesting and challenging area of Wireless Sensor Networks (WSN) is rapidly coming of age. Wireless sensor networks are attractive means to monitor environmental conditions and to bridge the gap between the physical and the digital world. Wireless Sensor Networks are highly distributed networks of small, lightweight wireless nodes deployed in large numbers in-situ to monitor the environment or a system. The nodes cooperate and collaborate on their data, which leads to accurate sensing of events in the environment.
{"title":"Wireless sensor node variants and their application domains","authors":"R. Rao, Haribabu, D. Selvakumar","doi":"10.1145/2185216.2185350","DOIUrl":"https://doi.org/10.1145/2185216.2185350","url":null,"abstract":"Recent advances in embedded systems and mobile technologies are paving the way for the next revolution in computing, Ubiquitous Computing, the future towards which all the current technological developments are heading. Ubiquitous computing has potential applications in several sectors such as healthcare, business processes, disaster mitigation and management, farm land irrigation, and empowering the common man to improve the quality of life. Wireless communication modules and sensors are major building blocks of ubiquitous computing paradigm. As the field of communication networks continues to evolve, a very interesting and challenging area of Wireless Sensor Networks (WSN) is rapidly coming of age. Wireless sensor networks are attractive means to monitor environmental conditions and to bridge the gap between the physical and the digital world. Wireless Sensor Networks are highly distributed networks of small, lightweight wireless nodes deployed in large numbers in-situ to monitor the environment or a system. The nodes cooperate and collaborate on their data, which leads to accurate sensing of events in the environment.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120946349","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}
A Wireless Sensor Network (WSN) is an emerging technology for a wide range of potential applications, including the environmental monitoring, medical, and target tracking systems. A WSN comprises a set of sensor nodes deployed in an area of interest. Sensor nodes are normally located in a dense and ad hoc manner, communicating each other in a multi-hop fashion in order to collect, process, and relay data. Most of WSNs are built on wireless, battery-powered sensor nodes. In such networks, it is hard to recharge or replace the energy-depleted nodes due to the desolate or harsh environment of the target area. Therefore, the efficient use of limited energy is a primary concern in designing protocols and usage strategies for WSNs. In this work an emergency scenario is considered and a WSN is used to monitoring the emergency area. To limit the power consumption, the WSN is activated only when the emergency occurs. Moreover an integrated protocol for routing and localization is developed to reduce communication, which is the most power-consuming operation in WSNs.
{"title":"A simultaneous routing and localization algorithm for wireless sensor networks in emergency scenario","authors":"S. Panzieri, F. Pascucci, L. Sciavicco","doi":"10.1145/2185216.2185285","DOIUrl":"https://doi.org/10.1145/2185216.2185285","url":null,"abstract":"A Wireless Sensor Network (WSN) is an emerging technology for a wide range of potential applications, including the environmental monitoring, medical, and target tracking systems. A WSN comprises a set of sensor nodes deployed in an area of interest. Sensor nodes are normally located in a dense and ad hoc manner, communicating each other in a multi-hop fashion in order to collect, process, and relay data. Most of WSNs are built on wireless, battery-powered sensor nodes. In such networks, it is hard to recharge or replace the energy-depleted nodes due to the desolate or harsh environment of the target area. Therefore, the efficient use of limited energy is a primary concern in designing protocols and usage strategies for WSNs. In this work an emergency scenario is considered and a WSN is used to monitoring the emergency area. To limit the power consumption, the WSN is activated only when the emergency occurs. Moreover an integrated protocol for routing and localization is developed to reduce communication, which is the most power-consuming operation in WSNs.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114062643","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}
WiMAX at 4.9GHz has been identified by the ITU as important in achieving harmonised spectrum for advanced public protection and disaster relief. The band is currently used for this purpose in the US for disaster relief. The most recent WiMAX standard (802.16e) supports broadband applications to mobile terminals and laptops. In particular, WiMAX technology is one of the most energy efficient systems among pre-4G systems and it is capable to provide a Broadband Wireless Access in metropolitan areas. In this paper, adaptive modulation technique is proposed with the aim of improving performances in Non Line-of-Sight communications, typical of urban environments. Through these techniques it is possible to switch the order of the modulation to better match the channel conditions even in the disaster situation, obtaining comforting results in terms of probability of error and throughput. The system has been modeled with a finite state structure in which every state consists in a possible scheme of transmission (i.e. a specific modulation and the switch among different states happens when multiple thresholds on channel attenuation are reached. The adaptation is realized at the physical level of the transmission for a WiMAX OFDMA structure. Additive White Gaussian Noise (AWGN) model is used with Rayleigh fading to resemble the real world scenario. The proposed technique is suitable for different kind of traffic to meet different QoS requirements. The Intent of this paper is to provide better performance by maintaining the block error rate under a limit and it achieves improved throughput even with less average bits per symbol in WiMAX system.
{"title":"A novel adaptive modulation scheme for WIMAX OFDM system to improve QoS","authors":"Mrs. M. G. Sumithra, M. Sarumathi","doi":"10.1145/2185216.2185344","DOIUrl":"https://doi.org/10.1145/2185216.2185344","url":null,"abstract":"WiMAX at 4.9GHz has been identified by the ITU as important in achieving harmonised spectrum for advanced public protection and disaster relief. The band is currently used for this purpose in the US for disaster relief. The most recent WiMAX standard (802.16e) supports broadband applications to mobile terminals and laptops. In particular, WiMAX technology is one of the most energy efficient systems among pre-4G systems and it is capable to provide a Broadband Wireless Access in metropolitan areas. In this paper, adaptive modulation technique is proposed with the aim of improving performances in Non Line-of-Sight communications, typical of urban environments. Through these techniques it is possible to switch the order of the modulation to better match the channel conditions even in the disaster situation, obtaining comforting results in terms of probability of error and throughput. The system has been modeled with a finite state structure in which every state consists in a possible scheme of transmission (i.e. a specific modulation and the switch among different states happens when multiple thresholds on channel attenuation are reached. The adaptation is realized at the physical level of the transmission for a WiMAX OFDMA structure. Additive White Gaussian Noise (AWGN) model is used with Rayleigh fading to resemble the real world scenario. The proposed technique is suitable for different kind of traffic to meet different QoS requirements. The Intent of this paper is to provide better performance by maintaining the block error rate under a limit and it achieves improved throughput even with less average bits per symbol in WiMAX system.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116942409","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}
Chinmoy Mukherjee, K. Gupta, R. Nallusamy, S. Kalra
Wireless technologies are evolving in rapid pace and becoming cheaper - this can be used to facilitate providing primary healthcare services in rural India. We have built a decision support system which can provide first level assessment of a patient by taking all the symptoms as well as vital parameters like heart rate, blood pressure, etc. It can also provide some basic treatment suggestions like Oral Rehydration Salts (ORS) for diarrhea, etc. The patient details as well as assessment can be uploaded to a server, which can be assessed by a doctor to provide actual treatment. The patient details can also be used for analytical purpose for drafting plans for future by Government agencies. The system also works as personal assistant for ASHA (Accredited Social Health Activist) health workers to assist them to do their job efficiently. This system mainly has three components: Mobile Client, Server and Database. Mobile clients are used to collect data from patients and provide first level assessment. Server component will process the data for the purpose of analysis and Authorized Doctors can retrieve patient details, ask few more questions to the patient via ASHA worker and can provide treatments over SMS or email. Database system will be used to archive data for analysis purposes.
{"title":"A system to provide primary healthcare services to rural India more efficiently and transparently","authors":"Chinmoy Mukherjee, K. Gupta, R. Nallusamy, S. Kalra","doi":"10.1145/2185216.2185317","DOIUrl":"https://doi.org/10.1145/2185216.2185317","url":null,"abstract":"Wireless technologies are evolving in rapid pace and becoming cheaper - this can be used to facilitate providing primary healthcare services in rural India. We have built a decision support system which can provide first level assessment of a patient by taking all the symptoms as well as vital parameters like heart rate, blood pressure, etc. It can also provide some basic treatment suggestions like Oral Rehydration Salts (ORS) for diarrhea, etc. The patient details as well as assessment can be uploaded to a server, which can be assessed by a doctor to provide actual treatment. The patient details can also be used for analytical purpose for drafting plans for future by Government agencies. The system also works as personal assistant for ASHA (Accredited Social Health Activist) health workers to assist them to do their job efficiently. This system mainly has three components: Mobile Client, Server and Database. Mobile clients are used to collect data from patients and provide first level assessment. Server component will process the data for the purpose of analysis and Authorized Doctors can retrieve patient details, ask few more questions to the patient via ASHA worker and can provide treatments over SMS or email. Database system will be used to archive data for analysis purposes.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124629724","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}
Self-Organization properties of the nodes in wireless network play an important role in achieving network wide characteristics. In harsh conditions where network connectivity is less, increasing connectivity with faster data transmission is clearly an area of research. Connectivity of the nodes is dependent on many factors like, energy, position, mobility and environmental changes. Modeling an algorithm that can increase the connectivity despite above mentioned factors is a challenge that we have tried to investigate. Faster data transmissions can be achieved by reducing average path length from source to destination. In real networks, however, increasing connectivity and reducing average path length is a hard task. One way to reduce average path lengths is by the use of Small World phenomenon. Thus here in this work we try to investigate how Small World phenomenon can help us in our goal of achieving higher connectivity and reduced average path length. Our model results show that using Small World connectivity can also be increased with the reduction in the average path length.
{"title":"Design issues in self-organizing wireless sensor networks","authors":"M. Becker","doi":"10.1145/2185216.2185259","DOIUrl":"https://doi.org/10.1145/2185216.2185259","url":null,"abstract":"Self-Organization properties of the nodes in wireless network play an important role in achieving network wide characteristics. In harsh conditions where network connectivity is less, increasing connectivity with faster data transmission is clearly an area of research. Connectivity of the nodes is dependent on many factors like, energy, position, mobility and environmental changes. Modeling an algorithm that can increase the connectivity despite above mentioned factors is a challenge that we have tried to investigate. Faster data transmissions can be achieved by reducing average path length from source to destination. In real networks, however, increasing connectivity and reducing average path length is a hard task. One way to reduce average path lengths is by the use of Small World phenomenon. Thus here in this work we try to investigate how Small World phenomenon can help us in our goal of achieving higher connectivity and reduced average path length. Our model results show that using Small World connectivity can also be increased with the reduction in the average path length.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124173836","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}
In this work, we present and investigate the performance of novel classification schemes for spectrum sensing in cooperative multiple-input multiple-output (MIMO) wireless cognitive radio (CR) networks. In this context, we consider several optimal classification schemes such as support vector classifiers (SVC), logistic regression (LR) and quadratic discrimination (QD) for primary user detection. It is demonstrated that these classification techniques have a significantly reduced complexity of implementation in practical CR applications compared to conventional likelihood based detection schemes as they do not require knowledge of the channel state information and noise power. Further, in the presence of disruptive malicious users, the proposed classifiers have a significantly lower detection error compared to conventional detection schemes. Also, we propose a novel QD classifier for blind MIMO spectrum sensing scenarios. The detection performance of the proposed classifiers is compared with existing schemes in co-operative CR scenarios. It is demonstrated through simulation of several scenarios including the presence of malicious users, Doppler shift, and carrier frequency offset that the proposed classifiers offer a robust and significantly superior alternative to existing schemes for co-operative MIMO CR spectrum sensing.
{"title":"Optimal classifier based spectrum sensing in cognitive radio wireless systems","authors":"Siddharth Sharma, A. Jagannatham","doi":"10.1145/2185216.2185265","DOIUrl":"https://doi.org/10.1145/2185216.2185265","url":null,"abstract":"In this work, we present and investigate the performance of novel classification schemes for spectrum sensing in cooperative multiple-input multiple-output (MIMO) wireless cognitive radio (CR) networks. In this context, we consider several optimal classification schemes such as support vector classifiers (SVC), logistic regression (LR) and quadratic discrimination (QD) for primary user detection. It is demonstrated that these classification techniques have a significantly reduced complexity of implementation in practical CR applications compared to conventional likelihood based detection schemes as they do not require knowledge of the channel state information and noise power. Further, in the presence of disruptive malicious users, the proposed classifiers have a significantly lower detection error compared to conventional detection schemes. Also, we propose a novel QD classifier for blind MIMO spectrum sensing scenarios. The detection performance of the proposed classifiers is compared with existing schemes in co-operative CR scenarios. It is demonstrated through simulation of several scenarios including the presence of malicious users, Doppler shift, and carrier frequency offset that the proposed classifiers offer a robust and significantly superior alternative to existing schemes for co-operative MIMO CR spectrum sensing.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131865631","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}
Ad hoc networks are wireless, infrastructureless, multi-hop and dynamic networks, established by a collection of mobile nodes which provide envisioned applications and features to the modern communication technologies and services. Multicast is a type of routing scheme, which transmit datagram's to a set of desirable destinations identified by a single address which can efficiently support a variety of applications and services. Most of existing multicast routing protocols in MANETs consider only one source in a multicast group and become extended to multi-source multicasting. In this paper, we proposed a cluster-based multicast routing protocol with the use of genetic algorithm to provide efficient multicasting for ad hoc networks in multicast environment. The simulation composed with 200 mobile nodes with both single active multicast cluster and multiple active multicast clusters. This proposed cluster-based routing preserve forwarding efficiency as well as robustness due to this cluster structure and maintenance. Moreover, to prove the proposed approach performance which has compared with ODMRP routing protocol for delivery ratio, control overhead and forwarding efficiency in the different multicast effects such as increasing number of sources and receivers in the network.
{"title":"A cluster based multi-source multicast routing protocol using genetic algorithm for mobile ad hoc networks","authors":"R. Selvam, Palanisamy Velliyan","doi":"10.1145/2185216.2185321","DOIUrl":"https://doi.org/10.1145/2185216.2185321","url":null,"abstract":"Ad hoc networks are wireless, infrastructureless, multi-hop and dynamic networks, established by a collection of mobile nodes which provide envisioned applications and features to the modern communication technologies and services. Multicast is a type of routing scheme, which transmit datagram's to a set of desirable destinations identified by a single address which can efficiently support a variety of applications and services. Most of existing multicast routing protocols in MANETs consider only one source in a multicast group and become extended to multi-source multicasting. In this paper, we proposed a cluster-based multicast routing protocol with the use of genetic algorithm to provide efficient multicasting for ad hoc networks in multicast environment. The simulation composed with 200 mobile nodes with both single active multicast cluster and multiple active multicast clusters. This proposed cluster-based routing preserve forwarding efficiency as well as robustness due to this cluster structure and maintenance. Moreover, to prove the proposed approach performance which has compared with ODMRP routing protocol for delivery ratio, control overhead and forwarding efficiency in the different multicast effects such as increasing number of sources and receivers in the network.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134285341","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. Muthuramalingam, M. Vasanthakumar, C. M. Balaji
Mobile Ad Hoc Networks (MANET) is a collection of several wireless hosts, which form a network, without any infrastructure requirements. These are temporary networks, which cease to exist when no longer needed. In MANETs any node can act as a router, to provide connectivity to other nodes, within its transmission range. Several nodes in a Mobile Ad Hoc Network get connected via Shortest Paths to ensure minimal cost of transmission. In the process of computing the shortest path, certain critical points called articulation points are formed. Articulation points are those, when removed from the network, detaches a sub tree of nodes from the parent network, thereby disrupting the network connection. Therefore, if the node at the articulation point fails, other nodes, dependant on that node, are removed from the network. We propose an efficient method to identify and avoid formation of such articulation points, during the formation of an Ad Hoc Network. Our algorithm helps in finding alternate paths for connection, and hence improves the reliability and longevity of the network.
{"title":"A new weight based self-organizing approach to clustering in mobile ad hoc networks","authors":"S. Muthuramalingam, M. Vasanthakumar, C. M. Balaji","doi":"10.1145/2185216.2185340","DOIUrl":"https://doi.org/10.1145/2185216.2185340","url":null,"abstract":"Mobile Ad Hoc Networks (MANET) is a collection of several wireless hosts, which form a network, without any infrastructure requirements. These are temporary networks, which cease to exist when no longer needed. In MANETs any node can act as a router, to provide connectivity to other nodes, within its transmission range. Several nodes in a Mobile Ad Hoc Network get connected via Shortest Paths to ensure minimal cost of transmission. In the process of computing the shortest path, certain critical points called articulation points are formed. Articulation points are those, when removed from the network, detaches a sub tree of nodes from the parent network, thereby disrupting the network connection. Therefore, if the node at the articulation point fails, other nodes, dependant on that node, are removed from the network. We propose an efficient method to identify and avoid formation of such articulation points, during the formation of an Ad Hoc Network. Our algorithm helps in finding alternate paths for connection, and hence improves the reliability and longevity of the network.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"404 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131425767","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}
In this lecture the proposal that cognitive radios consult with a supporting network infrastructure to enable coexistence in the signal strength domain is examined. The network server would either grant or reject transmission requests by estimating, from the cognitive radio's geo-location, the likely impact its transmission would have on incumbents and other cognitive radio devices. This decision must be based on an accurate real-time radio environment map (REM) [1] which is kept up to date by readings from cognitive radios, sensors and dynamic radio propagation prediction. By this means the imperative of coexistence in the signal strength domain of cognitive radio technology can be satisfied. It is also shown that this approach also offers a means with which to detect physical-layer attacks. It is explained that Integral Equation-based propagation prediction algorithms are appropriate candidates for the dynamic propagation engine necessary for the purposes outlined above given their 'automatic' nature and that they can give results arbitrarily close to the exact numerical solution. The humanitarian relevance of cognitive radio is that where operated as infrastructureless networks they will provide telecommunications services to deprived areas and could prove vital in disaster recovery. Where there is network support cognitive radios will become cheaper as a result.
{"title":"Integral equation methods for power control in cognitive radio","authors":"E. Nuallain","doi":"10.1145/2185216.2185264","DOIUrl":"https://doi.org/10.1145/2185216.2185264","url":null,"abstract":"In this lecture the proposal that cognitive radios consult with a supporting network infrastructure to enable coexistence in the signal strength domain is examined. The network server would either grant or reject transmission requests by estimating, from the cognitive radio's geo-location, the likely impact its transmission would have on incumbents and other cognitive radio devices. This decision must be based on an accurate real-time radio environment map (REM) [1] which is kept up to date by readings from cognitive radios, sensors and dynamic radio propagation prediction. By this means the imperative of coexistence in the signal strength domain of cognitive radio technology can be satisfied. It is also shown that this approach also offers a means with which to detect physical-layer attacks.\u0000 It is explained that Integral Equation-based propagation prediction algorithms are appropriate candidates for the dynamic propagation engine necessary for the purposes outlined above given their 'automatic' nature and that they can give results arbitrarily close to the exact numerical solution.\u0000 The humanitarian relevance of cognitive radio is that where operated as infrastructureless networks they will provide telecommunications services to deprived areas and could prove vital in disaster recovery. Where there is network support cognitive radios will become cheaper as a result.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123172551","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}
Selected mapping (SLM) is an attractive, non-distortion technique to reduce the PAPR of OFDM signal. The conventional SLM method requires the transmission of side information i.e. the index of the selected signal (with lowest PAPR) with each OFDM symbol. This leads to reduction in data rate loss. In this paper we have proposed two new phase sequence sets (i) modified binary chaotic sequence and (ii) modified Hadamard sequence for SLM-OFDM system based on quaternary modulation and suggested a new mapping scheme called "Rectangular Mapping" to map the Quaternary data to 8-PSK constellation by using two phase factors {1, j} to eliminate the requirement of SI. The proposed method provides good PAPR reduction in comparison to existing SLM schemes and provides consistent SER performance as SI is not required.
{"title":"Two new phase sequence sets for PAPR reduction in SLM-OFDM systems without side information","authors":"A. Goel, P. G. Poddar, M. Agrawal","doi":"10.1145/2185216.2185238","DOIUrl":"https://doi.org/10.1145/2185216.2185238","url":null,"abstract":"Selected mapping (SLM) is an attractive, non-distortion technique to reduce the PAPR of OFDM signal. The conventional SLM method requires the transmission of side information i.e. the index of the selected signal (with lowest PAPR) with each OFDM symbol. This leads to reduction in data rate loss. In this paper we have proposed two new phase sequence sets (i) modified binary chaotic sequence and (ii) modified Hadamard sequence for SLM-OFDM system based on quaternary modulation and suggested a new mapping scheme called \"Rectangular Mapping\" to map the Quaternary data to 8-PSK constellation by using two phase factors {1, j} to eliminate the requirement of SI. The proposed method provides good PAPR reduction in comparison to existing SLM schemes and provides consistent SER performance as SI is not required.","PeriodicalId":180836,"journal":{"name":"International Conference on Wireless Technologies for Humanitarian Relief","volume":"304 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115932640","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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