Pub Date : 2018-08-01DOI: 10.1109/ISWCS.2018.8491062
Patrick Agostini, Z. Utkovski, Jens Pilz, S. Stańczak
Massive connectivity for massive machine-type communications (mMTC) is key enabler for many 5G and Intternet-of-Things (IoT) applications. In mMTC scenarios, a large number of low-complexity, low-rate devices transmit sporadically over shared scarce communication resources. Reliability and low-latency with short packet transmissions are major design criteria that require integration of novel network architecture solutions and multiple access methods. This study addresses the challenge of massive connectivity in the context of a Cloud Radio Access Network (C-RAN), characterized by a hierarchical structure in which part of the processing functionalities of the Radio Units (RUs) are migrated to a centralized cloud processor or Central Unit (CU). A major architectural constraint of C-RANs is imposed by capacity-limited fronthaul links connecting the RUs with the CU. In this study, the performance of a transmission scheme for massive connectivity is investigated under this architectural constraint. In particular, a non-coherent, grant-free transmission scheme is proposed where the encoding is performed based on a Gabor frame structure. The fronthaul processing is a particular instance of Detect-and-Forward (DtF), where local detection at the RUs is performed using a one-step thresholding procedure, and the local estimates are then merged at the central processor via the capacity-limited fronthaul links. Numerical results illustrate the potential of the proposed scheme to support massive, reliable random access with short messages.
{"title":"Scalable Massive Random Access in C- RAN with Fronthaul Limitations","authors":"Patrick Agostini, Z. Utkovski, Jens Pilz, S. Stańczak","doi":"10.1109/ISWCS.2018.8491062","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491062","url":null,"abstract":"Massive connectivity for massive machine-type communications (mMTC) is key enabler for many 5G and Intternet-of-Things (IoT) applications. In mMTC scenarios, a large number of low-complexity, low-rate devices transmit sporadically over shared scarce communication resources. Reliability and low-latency with short packet transmissions are major design criteria that require integration of novel network architecture solutions and multiple access methods. This study addresses the challenge of massive connectivity in the context of a Cloud Radio Access Network (C-RAN), characterized by a hierarchical structure in which part of the processing functionalities of the Radio Units (RUs) are migrated to a centralized cloud processor or Central Unit (CU). A major architectural constraint of C-RANs is imposed by capacity-limited fronthaul links connecting the RUs with the CU. In this study, the performance of a transmission scheme for massive connectivity is investigated under this architectural constraint. In particular, a non-coherent, grant-free transmission scheme is proposed where the encoding is performed based on a Gabor frame structure. The fronthaul processing is a particular instance of Detect-and-Forward (DtF), where local detection at the RUs is performed using a one-step thresholding procedure, and the local estimates are then merged at the central processor via the capacity-limited fronthaul links. Numerical results illustrate the potential of the proposed scheme to support massive, reliable random access with short messages.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123714223","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491054
S. Buzzi, C. D’Andrea, C. D'Elia
In the user-centric (UC) cell-free Massive MIMO architecture, a large number of distributed access points (APs) are deployed in a given area, each one serving the mobile stations (MSs) that are received with the largest power. This architecture has been shown to offer some advantages over a co-located massive MIMO architecture, especially in terms of fairness among users. This paper proposes to improve the performance of such a system by using local partial zero-forcing (PZF) precoding on the downlink and successive interference cancellation (SIC) on the uplink. The proposed schemes can be implemented locally, i.e. the channel estimates and the beamformers at the APs are computed and exploited locally, with no need to exchange information with a central processing unit (CPU); moreover the beamformers used at the MSs are channel independent, i.e. no channel estimate is needed at the MS. The numerical results show that the proposed transceiver algorithms provide remarkable performance improvements with respect to competing alternatives.
{"title":"User-Centric Cell-Free Massive MIMO with Interference Cancellation and Local ZF Downlink Precoding","authors":"S. Buzzi, C. D’Andrea, C. D'Elia","doi":"10.1109/ISWCS.2018.8491054","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491054","url":null,"abstract":"In the user-centric (UC) cell-free Massive MIMO architecture, a large number of distributed access points (APs) are deployed in a given area, each one serving the mobile stations (MSs) that are received with the largest power. This architecture has been shown to offer some advantages over a co-located massive MIMO architecture, especially in terms of fairness among users. This paper proposes to improve the performance of such a system by using local partial zero-forcing (PZF) precoding on the downlink and successive interference cancellation (SIC) on the uplink. The proposed schemes can be implemented locally, i.e. the channel estimates and the beamformers at the APs are computed and exploited locally, with no need to exchange information with a central processing unit (CPU); moreover the beamformers used at the MSs are channel independent, i.e. no channel estimate is needed at the MS. The numerical results show that the proposed transceiver algorithms provide remarkable performance improvements with respect to competing alternatives.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122512951","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491248
Jing Guo, Xiangyun Zhou, S. Durrani, H. Yanikomeroglu
In this paper, we study a multiple access monostatic backscatter communication (BackCom) system, where one reader talks to multiple backscatter nodes (BNs). We propose to use nonorthogonal multiple access (NOMA) to improve the efficiency of BackCom system. Specifically, the reader uses the feedback signal during the training phase to separate the multiple BNs into two groups. The reader then randomly pairs the BNs from these two groups to implement NOMA. We propose to set the reflection coefficients for these two groups differently to further distinguish the reflected signal power for the paired BNs. To characterize the network performance, we derive an analytical expression for the success rate which shows the percentage of bits that can be successfully decoded in one time slot. We also present the design guideline of the reflection coefficients for the two groups to maximize the system performance. Our numerical results show that increasing the readers transmit power has little impact on the system performance when the channel condition on the transmission link is less severe. Instead, the proper choice of the reflection coefficients for the two groups of BNs can greatly enhance the BackCom system.
{"title":"Backscatter communications with NOMA (Invited Paper)","authors":"Jing Guo, Xiangyun Zhou, S. Durrani, H. Yanikomeroglu","doi":"10.1109/ISWCS.2018.8491248","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491248","url":null,"abstract":"In this paper, we study a multiple access monostatic backscatter communication (BackCom) system, where one reader talks to multiple backscatter nodes (BNs). We propose to use nonorthogonal multiple access (NOMA) to improve the efficiency of BackCom system. Specifically, the reader uses the feedback signal during the training phase to separate the multiple BNs into two groups. The reader then randomly pairs the BNs from these two groups to implement NOMA. We propose to set the reflection coefficients for these two groups differently to further distinguish the reflected signal power for the paired BNs. To characterize the network performance, we derive an analytical expression for the success rate which shows the percentage of bits that can be successfully decoded in one time slot. We also present the design guideline of the reflection coefficients for the two groups to maximize the system performance. Our numerical results show that increasing the readers transmit power has little impact on the system performance when the channel condition on the transmission link is less severe. Instead, the proper choice of the reflection coefficients for the two groups of BNs can greatly enhance the BackCom system.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125009504","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491243
Daniel A. R. Adauto, R. M. D. Moraes
Some multi-channel medium access control (MAC) protocols have been proposed to provide more efficient communication in ad hoc networks. In addition, each communication channel can be shared simultaneously among several nodes through techniques such as multiple-input multiple-output (MIMO) and frequency division multiple access (FDMA), making the IEEE 802.11 Standard-based technology suitable for multipacket transmission and reception (MPTR). This paper presents a new Hybrid and Adaptive Approach to the Many-to-Many Communication Multi-channel MAC Protocol (H-M2MMAC) based on the Split Phase scheme of the IEEE 802.11 Power Save Mode (PSM). Beyond using the communication phase to transmit data, it enables the transmission of data during the negotiation (or control) phase under high load conditions. The results show that H-M2MMAC has superior throughput performance compared with related multi-channel protocols.
{"title":"A Hybrid Many-to-Many Communication Multi -Channel MAC Protocol for Ad Hoc Networks","authors":"Daniel A. R. Adauto, R. M. D. Moraes","doi":"10.1109/ISWCS.2018.8491243","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491243","url":null,"abstract":"Some multi-channel medium access control (MAC) protocols have been proposed to provide more efficient communication in ad hoc networks. In addition, each communication channel can be shared simultaneously among several nodes through techniques such as multiple-input multiple-output (MIMO) and frequency division multiple access (FDMA), making the IEEE 802.11 Standard-based technology suitable for multipacket transmission and reception (MPTR). This paper presents a new Hybrid and Adaptive Approach to the Many-to-Many Communication Multi-channel MAC Protocol (H-M2MMAC) based on the Split Phase scheme of the IEEE 802.11 Power Save Mode (PSM). Beyond using the communication phase to transmit data, it enables the transmission of data during the negotiation (or control) phase under high load conditions. The results show that H-M2MMAC has superior throughput performance compared with related multi-channel protocols.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127457074","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491077
Ignacio Rodriguez, Mads Lauridsen, Gabriel Vasluianu, Anders N. Poulsen, P. Mogensen
The Wireless Communications Networks Section, from the Department of Electronic Systems at Aalborg University, Denmark, has successfully deployed, in collaboration with a number of Danish local industrial partners and the municipality of Aalborg, a LoRa network in the Gigantium multi-arena center. The initial aim of this network is to serve as an integrated multi-arena indoor environment monitoring wireless system, in contrast to the existing cabled solutions based on bus communication systems for each of the individual arenas. In addition, the network also enables usage monitoring of arenas and meeting rooms. The final setup is comprised of 33 multi-sensor nodes distributed across the multiple arenas, and 4 gateways, which provide macroscopic diversity to the wireless system, ensuring a high level of reliability. The setup is already operational, but still open for optimization. The deployed network will serve as a testbed for research in the wireless, and indoor environment domains.
{"title":"The Gigantium Smart City Living Lab: A Multi-Arena LoRa-based Testbed","authors":"Ignacio Rodriguez, Mads Lauridsen, Gabriel Vasluianu, Anders N. Poulsen, P. Mogensen","doi":"10.1109/ISWCS.2018.8491077","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491077","url":null,"abstract":"The Wireless Communications Networks Section, from the Department of Electronic Systems at Aalborg University, Denmark, has successfully deployed, in collaboration with a number of Danish local industrial partners and the municipality of Aalborg, a LoRa network in the Gigantium multi-arena center. The initial aim of this network is to serve as an integrated multi-arena indoor environment monitoring wireless system, in contrast to the existing cabled solutions based on bus communication systems for each of the individual arenas. In addition, the network also enables usage monitoring of arenas and meeting rooms. The final setup is comprised of 33 multi-sensor nodes distributed across the multiple arenas, and 4 gateways, which provide macroscopic diversity to the wireless system, ensuring a high level of reliability. The setup is already operational, but still open for optimization. The deployed network will serve as a testbed for research in the wireless, and indoor environment domains.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125335319","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491051
Alaa Khreis, P. Ciblat, Francesca Bassi, P. Duhamel
Reliable data transmission within wireless communication systems can be obtained via various means, including (i) Hybrid Automatic Repeat reQuest (HARQ) mechanisms which allow retransmission of incorrectly decoded packets; (ii) Additional nodes, called relays, which may also help the transmission by retransmitting these packets. An efficient combination of both techniques is therefore of great interest. This paper investigates a relay assisted HARQ protocol aiming at maximizing the system throughput. The protocol allows the source to transmit a new message during the same time-slot in which the relay is retransmitting a previous message. By using an efficient interference canceler at the destination, the numerical results show significant throughput gain compared to standard approaches.
{"title":"Throughput-efficient Relay assisted Hybrid ARQ","authors":"Alaa Khreis, P. Ciblat, Francesca Bassi, P. Duhamel","doi":"10.1109/ISWCS.2018.8491051","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491051","url":null,"abstract":"Reliable data transmission within wireless communication systems can be obtained via various means, including (i) Hybrid Automatic Repeat reQuest (HARQ) mechanisms which allow retransmission of incorrectly decoded packets; (ii) Additional nodes, called relays, which may also help the transmission by retransmitting these packets. An efficient combination of both techniques is therefore of great interest. This paper investigates a relay assisted HARQ protocol aiming at maximizing the system throughput. The protocol allows the source to transmit a new message during the same time-slot in which the relay is retransmitting a previous message. By using an efficient interference canceler at the destination, the numerical results show significant throughput gain compared to standard approaches.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125447046","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491195
Ang-Hsun Tsai
In this paper, the three-dimension directional antenna is proposed to be installed on the small-cells to mitigate the two-tier interference of the ultra-dense heterogeneous small-cell network. We investigate the impacts of the three-dimension directional antennas and the resource block (RB) usage ratio on the system capacity and link reliability for the ultra-dense small-cell system in an apartment building. The three-dimension directional antenna can provide the strong signal for users with the high main lobe gain, and mitigate the intra-cell interference among neighboring small-cells with low side lobes. Consequently, the average system throughput can be significantly improved under a link reliability requirement. Simulation results show that our proposed 12-sector directional antenna can improve 229% average system capacity compared to the 3-sector directional antenna under the link reliability requirement. Meanwhile, the omnidirectional antenna cannot afford the reliable service quality for users in the apartment building in the ultra-dense heterogeneous small-cell network.
{"title":"Two-Tier Interference Mitigation with Directional Antennas for Small-Cells in an Apartment Building","authors":"Ang-Hsun Tsai","doi":"10.1109/ISWCS.2018.8491195","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491195","url":null,"abstract":"In this paper, the three-dimension directional antenna is proposed to be installed on the small-cells to mitigate the two-tier interference of the ultra-dense heterogeneous small-cell network. We investigate the impacts of the three-dimension directional antennas and the resource block (RB) usage ratio on the system capacity and link reliability for the ultra-dense small-cell system in an apartment building. The three-dimension directional antenna can provide the strong signal for users with the high main lobe gain, and mitigate the intra-cell interference among neighboring small-cells with low side lobes. Consequently, the average system throughput can be significantly improved under a link reliability requirement. Simulation results show that our proposed 12-sector directional antenna can improve 229% average system capacity compared to the 3-sector directional antenna under the link reliability requirement. Meanwhile, the omnidirectional antenna cannot afford the reliable service quality for users in the apartment building in the ultra-dense heterogeneous small-cell network.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121862647","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491048
Abrlelharnirl Salern, Leila Musavian
Rate-splitting (RS) technique has recently been proposed to provide significant performance benefits in multiple users communication systems. In this paper, we investigate the performance benefits of RS in a multi-pair relay network, in which multiple users communicate with multiple destination users through a multiple antennas decode-and-forward (DF) energy-harvesting (EH) relay node. In the first phase, the users transmit their independent signals to the relay. Part of the received signal power will be harvested at the relay node. In the second phase, the relay uses the harvested energy to decode and forward the received signals to their intended users using RS transmission technique. Based on the amount of the harvested power and the availability of the channel state information (CSI) at the relay node, different RS transmission strategies are investigated. New closed-form analytical expressions for the ergodic spectral efficiency is derived and Monte-Carlo simulations are provided to confirm the derivations. In addition, the impacts of the main system parameters on the proposed strategies are investigated.
{"title":"Rate Splitting in Multi - Pair Energy Harvesting Relaying systems","authors":"Abrlelharnirl Salern, Leila Musavian","doi":"10.1109/ISWCS.2018.8491048","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491048","url":null,"abstract":"Rate-splitting (RS) technique has recently been proposed to provide significant performance benefits in multiple users communication systems. In this paper, we investigate the performance benefits of RS in a multi-pair relay network, in which multiple users communicate with multiple destination users through a multiple antennas decode-and-forward (DF) energy-harvesting (EH) relay node. In the first phase, the users transmit their independent signals to the relay. Part of the received signal power will be harvested at the relay node. In the second phase, the relay uses the harvested energy to decode and forward the received signals to their intended users using RS transmission technique. Based on the amount of the harvested power and the availability of the channel state information (CSI) at the relay node, different RS transmission strategies are investigated. New closed-form analytical expressions for the ergodic spectral efficiency is derived and Monte-Carlo simulations are provided to confirm the derivations. In addition, the impacts of the main system parameters on the proposed strategies are investigated.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114373773","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491068
Xiaoli Ma, Hao Ye, Geoffrey Y. Li
Channel estimation is a critical module to determine the performance of wireless receivers. For some communication systems, the channels are time-varying and without well-justified models, e.g., underwater acoustic channels, high mobility channels, and mm Wave channels. These channels are usually hard to use finite parameters to estimate and track. Channel estimation in these cases may significantly affect the symbol detection performance. In this paper, we develop learning assisted (LA) channel estimation algorithms. We use CNN and DNN based channel estimators to track channel variations. We demonstrate that the estimators can be dynamically updated using pilots through incremental learning. Different from the existing channel estimators, our algorithms combine learning techniques with preamble training symbols and pilots, and thus can track channel variations on-line and fit better for the current cellular systems, vehicular communications, and underwater acoustic systems. Simulation results validate the effectiveness of our algorithms.
{"title":"Learning Assisted Estimation for Time- Varying Channels","authors":"Xiaoli Ma, Hao Ye, Geoffrey Y. Li","doi":"10.1109/ISWCS.2018.8491068","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491068","url":null,"abstract":"Channel estimation is a critical module to determine the performance of wireless receivers. For some communication systems, the channels are time-varying and without well-justified models, e.g., underwater acoustic channels, high mobility channels, and mm Wave channels. These channels are usually hard to use finite parameters to estimate and track. Channel estimation in these cases may significantly affect the symbol detection performance. In this paper, we develop learning assisted (LA) channel estimation algorithms. We use CNN and DNN based channel estimators to track channel variations. We demonstrate that the estimators can be dynamically updated using pilots through incremental learning. Different from the existing channel estimators, our algorithms combine learning techniques with preamble training symbols and pilots, and thus can track channel variations on-line and fit better for the current cellular systems, vehicular communications, and underwater acoustic systems. Simulation results validate the effectiveness of our algorithms.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114619091","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 : 2018-08-01DOI: 10.1109/ISWCS.2018.8491042
Zijian Wang, L. Vandendorpe
An energy efficiency (EE) maximization problem with multiple distributed antennas is considered in this paper. Besides the constraint on the total transmit power and per-antenna transmit power constraints, an additional constraint dealing with total weighted power is introduced. Moreover, a Quality-of-Service (QoS) constraint is introduced. Because the original problem is a fractional convex one, Dinkelbach's algorithm is implemented to reformulate the problem. By investigating the Karush- Kuhn- Tucker (KKT) conditions, the mathematical properties of the globally optimal solution are studied and proved, which provides a deeper understanding of the structure of power allocation among antennas. Numerical results demonstrate the effect of QoS on EE and also the structure of power allocation.
{"title":"Power Allocation for Energy Efficiency Optimization in Distributed Antenna Systems","authors":"Zijian Wang, L. Vandendorpe","doi":"10.1109/ISWCS.2018.8491042","DOIUrl":"https://doi.org/10.1109/ISWCS.2018.8491042","url":null,"abstract":"An energy efficiency (EE) maximization problem with multiple distributed antennas is considered in this paper. Besides the constraint on the total transmit power and per-antenna transmit power constraints, an additional constraint dealing with total weighted power is introduced. Moreover, a Quality-of-Service (QoS) constraint is introduced. Because the original problem is a fractional convex one, Dinkelbach's algorithm is implemented to reformulate the problem. By investigating the Karush- Kuhn- Tucker (KKT) conditions, the mathematical properties of the globally optimal solution are studied and proved, which provides a deeper understanding of the structure of power allocation among antennas. Numerical results demonstrate the effect of QoS on EE and also the structure of power allocation.","PeriodicalId":272951,"journal":{"name":"2018 15th International Symposium on Wireless Communication Systems (ISWCS)","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134504444","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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