Pub Date : 2014-10-23DOI: 10.1109/ISWCS.2014.6933464
D. L. Ruyet, R. Zakaria, Berna Özbek
This paper studies the impact of imperfect channel state information (CSI) due to limited feedback link on the performance of multi-user MIMO system using filter bank based multicarrier (FBMC) modulation. The system is composed of a transmitter performing Zero Forcing (ZF) precoding and single antenna receivers applying decoding techniques. Simulation-based results show that except when the number of users is less than the number of transmit antennas, the BER performance and capacity of FBMC and OFDM modulation are the same. These results are theoretically justified due to the distribution of the interfering terms. As in OFDM, depending on the number of interferers, for a given BER performance target, the required number of feedback bits per channel vector can be rather high. FBMC becomes attractive not only because it relaxes the synchronization with respect to OFDM, but also because it achieves the same performance results as OFDM for multiuser MIMO precoding even in the case of imperfect CSI at the transmitter.
{"title":"On precoding MIMO-FBMC with imperfect channel state information at the transmitter","authors":"D. L. Ruyet, R. Zakaria, Berna Özbek","doi":"10.1109/ISWCS.2014.6933464","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933464","url":null,"abstract":"This paper studies the impact of imperfect channel state information (CSI) due to limited feedback link on the performance of multi-user MIMO system using filter bank based multicarrier (FBMC) modulation. The system is composed of a transmitter performing Zero Forcing (ZF) precoding and single antenna receivers applying decoding techniques. Simulation-based results show that except when the number of users is less than the number of transmit antennas, the BER performance and capacity of FBMC and OFDM modulation are the same. These results are theoretically justified due to the distribution of the interfering terms. As in OFDM, depending on the number of interferers, for a given BER performance target, the required number of feedback bits per channel vector can be rather high. FBMC becomes attractive not only because it relaxes the synchronization with respect to OFDM, but also because it achieves the same performance results as OFDM for multiuser MIMO precoding even in the case of imperfect CSI at the transmitter.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121454713","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933363
G. Alfano, A. Zappone, Eduard Axel Jorswieck, G. Montorsi
The mutual information of a MIMO wireless channel, impaired by memoryless phase-noise, is characterized. Both a Line-of-Sight (LOS) MIMO link and a downlink channel with multiple-antenna base station (BS) are studied. For both cases, closed-form approximations of the mutual information in the low-SNR regime are derived. Next, leveraging the obtained approximations, power control policies for achievable rate maximization are designed by means of majorization theory and alternating maximization.
{"title":"Mutual information of phase-noise impaired wireless networks","authors":"G. Alfano, A. Zappone, Eduard Axel Jorswieck, G. Montorsi","doi":"10.1109/ISWCS.2014.6933363","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933363","url":null,"abstract":"The mutual information of a MIMO wireless channel, impaired by memoryless phase-noise, is characterized. Both a Line-of-Sight (LOS) MIMO link and a downlink channel with multiple-antenna base station (BS) are studied. For both cases, closed-form approximations of the mutual information in the low-SNR regime are derived. Next, leveraging the obtained approximations, power control policies for achievable rate maximization are designed by means of majorization theory and alternating maximization.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121002386","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933447
Pedro Suárez-Casal, J. Rodríguez-Piñeiro, J. García-Naya, L. Castedo
Modern wireless communication systems, such as WiMAX, rely on Orthogonal Frequency Division Multiplexing, a very robust modulation against frequency-selectivity, but very sensitive to time-selectivity, which is a typical feature in mobility scenarios. In this work, experimental measurements in real scenarios are carried out by employing WiMAX signals including the standard-compliant pilot signals. Highly time-varying conditions are induced by enlarging the symbol period by time interpolation in the digital domain. In addition, the performance of Inter-Carrier Interference cancellation techniques, which take advantage of the WiMAX pilot structure, are tested to evaluate their behaviour under highly time-varying conditions.
{"title":"Experimental assessment of WiMAX transmissions under highly time-varying channels","authors":"Pedro Suárez-Casal, J. Rodríguez-Piñeiro, J. García-Naya, L. Castedo","doi":"10.1109/ISWCS.2014.6933447","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933447","url":null,"abstract":"Modern wireless communication systems, such as WiMAX, rely on Orthogonal Frequency Division Multiplexing, a very robust modulation against frequency-selectivity, but very sensitive to time-selectivity, which is a typical feature in mobility scenarios. In this work, experimental measurements in real scenarios are carried out by employing WiMAX signals including the standard-compliant pilot signals. Highly time-varying conditions are induced by enlarging the symbol period by time interpolation in the digital domain. In addition, the performance of Inter-Carrier Interference cancellation techniques, which take advantage of the WiMAX pilot structure, are tested to evaluate their behaviour under highly time-varying conditions.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115402635","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933315
M. A. Ertürk, L. Vollero, M. Aydin, O. C. Turna, M. Bernaschi
Access Point (AP) selection in WiFi hotspots is driven by stations and it is based on the measured strongest RSSI (Received Signal Strength Indicator) level: any station connects to the AP that provides the higher physical data rate. Although simple and effective in low crowded scenarios with low-medium traffic load, this strategy performs inefficiently when the number of mobile users is high and their distribution among APs is unbalanced, i.e. when network congestion becomes an issue. Load Balancing (LB) solutions aim at solving this problem by enforcing the connection of stations to the AP having either the smallest number of associated stations or the lowest traffic load. However, LB solutions do not account for traffic priorities or, when they consider them, they do not deal with the joint configuration of QoS (Quality of Service) and LB parameters. In this study we present a framework for modeling, analyzing and designing QoS-aware LB solutions. The proposed framework assumes that stations implement the Enhanced Distributed Channel Access (EDCA) mechanism of the IEEE 802.11e standard. Moreover, in order to make the framework concrete, we assume that the QoS goal is the weighted fair allocation of wireless resources. However, the framework is not restricted to this goal and can be easily extended in order to deal with a different cost function. The proposed framework is validated through simulations in a typical indoor LB scenario. The results show that the model is effective in capturing network performance and in designing LB solutions that account for traffic priorities and the configuration of QoS parameters.
WiFi热点中的接入点(AP)选择由站点驱动，它基于测量到的最强RSSI(接收信号强度指标)水平:任何站点连接到提供更高物理数据速率的AP。虽然该策略在低拥挤、中低流量负载的场景下简单有效，但当移动用户数量大且在ap之间分布不均衡时，即网络拥塞问题出现时，该策略的效率低下。负载平衡(LB)解决方案旨在通过强制将站点连接到具有最小关联站点数量或最低流量负载的AP来解决此问题。但是，负载均衡解决方案没有考虑流量优先级，或者在考虑流量优先级时，没有处理QoS (Quality of Service)和负载均衡参数的联合配置。在本研究中，我们提出了一个建模、分析和设计qos感知LB解决方案的框架。提出的框架假设站实现IEEE 802.11e标准的增强型分布式信道接入(EDCA)机制。此外，为了使框架具体化，我们假设QoS目标是无线资源的加权公平分配。然而，该框架并不局限于此目标，并且可以很容易地扩展以处理不同的成本函数。通过典型室内LB场景的模拟验证了所提出的框架。结果表明，该模型在捕获网络性能和设计考虑流量优先级和QoS参数配置的LB解决方案方面是有效的。
{"title":"A framework for modeling and implementing QoS-aware load balancing solutions in WiFi hotspots","authors":"M. A. Ertürk, L. Vollero, M. Aydin, O. C. Turna, M. Bernaschi","doi":"10.1109/ISWCS.2014.6933315","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933315","url":null,"abstract":"Access Point (AP) selection in WiFi hotspots is driven by stations and it is based on the measured strongest RSSI (Received Signal Strength Indicator) level: any station connects to the AP that provides the higher physical data rate. Although simple and effective in low crowded scenarios with low-medium traffic load, this strategy performs inefficiently when the number of mobile users is high and their distribution among APs is unbalanced, i.e. when network congestion becomes an issue. Load Balancing (LB) solutions aim at solving this problem by enforcing the connection of stations to the AP having either the smallest number of associated stations or the lowest traffic load. However, LB solutions do not account for traffic priorities or, when they consider them, they do not deal with the joint configuration of QoS (Quality of Service) and LB parameters. In this study we present a framework for modeling, analyzing and designing QoS-aware LB solutions. The proposed framework assumes that stations implement the Enhanced Distributed Channel Access (EDCA) mechanism of the IEEE 802.11e standard. Moreover, in order to make the framework concrete, we assume that the QoS goal is the weighted fair allocation of wireless resources. However, the framework is not restricted to this goal and can be easily extended in order to deal with a different cost function. The proposed framework is validated through simulations in a typical indoor LB scenario. The results show that the model is effective in capturing network performance and in designing LB solutions that account for traffic priorities and the configuration of QoS parameters.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130741612","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933343
Qing Bai, A. Mezghani, M. Ivrlac, J. Nossek
The energy efficiency of a multi-antenna receiver is influenced by the configuration of the antenna array it employs, e.g. with more receive antennas, larger capacity can be obtained while power dissipation is expected to increase. When compact uniform linear arrays are considered, the distance between adjacent antennas becomes a critical parameter due to its close relation to both spatial correlation and antenna mutual coupling, which are the major effects introduced by compact antenna arrays. In this paper, we formulate the optimization of energy efficiency with respect to both the antenna spacing and the number of antennas, and perform extensive numerical experiments to evaluate the gain that can be achieved by applying the optimization results. Moreover, we demonstrate the effects of various system parameters on the optimal antenna spacing, including mean angle of arrival, angle spread, average channel gain, and antenna loss factor, and propose also a simple approximation method to greatly reduce the complexity in finding the optimal spacing.
{"title":"Optimizing the energy efficiency of SIMO receivers with compact uniform linear arrays","authors":"Qing Bai, A. Mezghani, M. Ivrlac, J. Nossek","doi":"10.1109/ISWCS.2014.6933343","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933343","url":null,"abstract":"The energy efficiency of a multi-antenna receiver is influenced by the configuration of the antenna array it employs, e.g. with more receive antennas, larger capacity can be obtained while power dissipation is expected to increase. When compact uniform linear arrays are considered, the distance between adjacent antennas becomes a critical parameter due to its close relation to both spatial correlation and antenna mutual coupling, which are the major effects introduced by compact antenna arrays. In this paper, we formulate the optimization of energy efficiency with respect to both the antenna spacing and the number of antennas, and perform extensive numerical experiments to evaluate the gain that can be achieved by applying the optimization results. Moreover, we demonstrate the effects of various system parameters on the optimal antenna spacing, including mean angle of arrival, angle spread, average channel gain, and antenna loss factor, and propose also a simple approximation method to greatly reduce the complexity in finding the optimal spacing.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131284239","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933446
M. Renfors, J. Yli-Kaakinen
This contribution addresses the channel equalization for MIMO systems utilizing filter bank based multicarrier (FBMC) transmission. The proposed frequency-domain MIMO equalizer is integrated with the subcarrier processing of the fast-convolution filter bank (FC-FB) structure. The performance of the proposed scheme is evaluated for both the static user and the user with high mobility in highly frequency-selective propagation scenarios. It is shown that integrating the equalization functions with the FC-FB processing leads to a highly efficient overall implementation.
{"title":"Fast-convolution implementation of linear equalization based multiantenna detection schemes","authors":"M. Renfors, J. Yli-Kaakinen","doi":"10.1109/ISWCS.2014.6933446","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933446","url":null,"abstract":"This contribution addresses the channel equalization for MIMO systems utilizing filter bank based multicarrier (FBMC) transmission. The proposed frequency-domain MIMO equalizer is integrated with the subcarrier processing of the fast-convolution filter bank (FC-FB) structure. The performance of the proposed scheme is evaluated for both the static user and the user with high mobility in highly frequency-selective propagation scenarios. It is shown that integrating the equalization functions with the FC-FB processing leads to a highly efficient overall implementation.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114227466","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933414
L. Goratti, G. Steri, K. Gomez, G. Baldini
Device-to-Device (D2D) communication is an important feature for many kinds of mobile networks and in particular for the UMTS Long Term Evolution Advanced (LTE-A) cellular technology, where an underlay network can be created between User Equipments (UEs) without the support of an evolved Node B (eNB). The possibility to allow direct links between UEs plays an important role when the commercial LTE infrastructure is subject to failures or becomes unavailable after a disaster. Project ABSOLUTE, in scenarios for public safety, proposes raising in the sky a balloon with attached a 4G eNB (AeNB) to restore temporarily connectivity. In all cases in which UEs are out-of-coverage of the AeNB like in indoors, D2D becomes crucial. In this work, we propose to establish direct links employing a communication protocol that relies on the transmission of beacon frames sent in broadcast mode by selected UEs. We delve security aspects of this D2D protocol suitable for Public Safety (PS) users with out-of-coverage UEs based on sharing encryption keys. We pursue a network connectivity analysis of the secure protocol whereby we are able to show the existence of tradeoff points between connectivity and the increased overhead added by security for different values of the system parameters.
{"title":"Connectivity and security in a D2D communication protocol for public safety applications","authors":"L. Goratti, G. Steri, K. Gomez, G. Baldini","doi":"10.1109/ISWCS.2014.6933414","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933414","url":null,"abstract":"Device-to-Device (D2D) communication is an important feature for many kinds of mobile networks and in particular for the UMTS Long Term Evolution Advanced (LTE-A) cellular technology, where an underlay network can be created between User Equipments (UEs) without the support of an evolved Node B (eNB). The possibility to allow direct links between UEs plays an important role when the commercial LTE infrastructure is subject to failures or becomes unavailable after a disaster. Project ABSOLUTE, in scenarios for public safety, proposes raising in the sky a balloon with attached a 4G eNB (AeNB) to restore temporarily connectivity. In all cases in which UEs are out-of-coverage of the AeNB like in indoors, D2D becomes crucial. In this work, we propose to establish direct links employing a communication protocol that relies on the transmission of beacon frames sent in broadcast mode by selected UEs. We delve security aspects of this D2D protocol suitable for Public Safety (PS) users with out-of-coverage UEs based on sharing encryption keys. We pursue a network connectivity analysis of the secure protocol whereby we are able to show the existence of tradeoff points between connectivity and the increased overhead added by security for different values of the system parameters.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114988814","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933323
Biling Zhang, Jung-Lang Yu, Jian-Wei Lai
The subspace channel estimation technique is investigated for MIMO-OFDM systems with space-time block codes (STBC). The noise subspace computed from the correlation matrix of received signals requires a large number of symbols to converge. Using the block cyclic property of the channel matrix, we propose the cyclic repetition method (CRM) to generate many times of equivalent symbols for each OFDM symbol. With these equivalent symbols, the subspace channel estimation can perform very well within a few OFDM symbols. Computer simulations demonstrate the proposed CRM-based channel estimation has better performance than the conventional ones.
{"title":"A fast subspace channel estimation for STBC-based MIMO-OFDM systems","authors":"Biling Zhang, Jung-Lang Yu, Jian-Wei Lai","doi":"10.1109/ISWCS.2014.6933323","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933323","url":null,"abstract":"The subspace channel estimation technique is investigated for MIMO-OFDM systems with space-time block codes (STBC). The noise subspace computed from the correlation matrix of received signals requires a large number of symbols to converge. Using the block cyclic property of the channel matrix, we propose the cyclic repetition method (CRM) to generate many times of equivalent symbols for each OFDM symbol. With these equivalent symbols, the subspace channel estimation can perform very well within a few OFDM symbols. Computer simulations demonstrate the proposed CRM-based channel estimation has better performance than the conventional ones.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124702906","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933337
Christoph Frenzel, Simon Lohmuller, L. Schmelz
The instrumentation of Self-Organising Network (SON) Functions in such way that they contribute to the operational objectives defined by a wireless network operator is a complex task. In order to enable automation of this configuration, we previously described the concept of a SON Objective Manager (SOM) which determines the best configuration based on conditional, ranked objectives and SON Function models describing the Key Performance Indicators (KPIs) optimised by some configuration. However, the simplicity of the models and the complexity of the design-time inference may limit the applicability of the initial concept. In this paper, we present an extended and enhanced run-time SOM with more expressive input models, namely, context-dependent, weighted operator objectives allowing a better trade-off and SON Function models defining the possible values of KPIs for some configuration. These improvements together allow for a broader application of the concept.
{"title":"SON management based on weighted objectives and combined SON Function models","authors":"Christoph Frenzel, Simon Lohmuller, L. Schmelz","doi":"10.1109/ISWCS.2014.6933337","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933337","url":null,"abstract":"The instrumentation of Self-Organising Network (SON) Functions in such way that they contribute to the operational objectives defined by a wireless network operator is a complex task. In order to enable automation of this configuration, we previously described the concept of a SON Objective Manager (SOM) which determines the best configuration based on conditional, ranked objectives and SON Function models describing the Key Performance Indicators (KPIs) optimised by some configuration. However, the simplicity of the models and the complexity of the design-time inference may limit the applicability of the initial concept. In this paper, we present an extended and enhanced run-time SOM with more expressive input models, namely, context-dependent, weighted operator objectives allowing a better trade-off and SON Function models defining the possible values of KPIs for some configuration. These improvements together allow for a broader application of the concept.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124810790","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 : 2014-10-23DOI: 10.1109/ISWCS.2014.6933370
Juwendo Denis, M. Pischella, D. L. Ruyet
This paper focuses on the resource allocation within an asynchronous ad hoc network that utilizes two different modulation techniques: orthogonal frequency-division multiplexing (OFDM) and filter bank based multicarrier (FBMC). More specifically, we investigate the problem of downlink sum rate maximization. The NP-hard formulation is first decomposed into two subproblems in order to decrease the computational complexity of the sum rate optimization problem. We propose a heuristic subcarrier allocation scheme followed by a centralized power allocation algorithm that iteratively solves the convex formulation obtained from a conservative approximation. Simulation analyses are provided to further validate the efficiency of our proposed algorithm and highlight the advantages, in terms of both convergence speed and spectral efficiency, of using FBMC over OFDM.
{"title":"A conservative approach to sum rate maximization in asynchronous ad hoc networks using multi-carrier modulation schemes","authors":"Juwendo Denis, M. Pischella, D. L. Ruyet","doi":"10.1109/ISWCS.2014.6933370","DOIUrl":"https://doi.org/10.1109/ISWCS.2014.6933370","url":null,"abstract":"This paper focuses on the resource allocation within an asynchronous ad hoc network that utilizes two different modulation techniques: orthogonal frequency-division multiplexing (OFDM) and filter bank based multicarrier (FBMC). More specifically, we investigate the problem of downlink sum rate maximization. The NP-hard formulation is first decomposed into two subproblems in order to decrease the computational complexity of the sum rate optimization problem. We propose a heuristic subcarrier allocation scheme followed by a centralized power allocation algorithm that iteratively solves the convex formulation obtained from a conservative approximation. Simulation analyses are provided to further validate the efficiency of our proposed algorithm and highlight the advantages, in terms of both convergence speed and spectral efficiency, of using FBMC over OFDM.","PeriodicalId":431852,"journal":{"name":"2014 11th International Symposium on Wireless Communications Systems (ISWCS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123637322","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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