Pub Date : 2015-08-13DOI: 10.1109/EUCNC.2015.7194032
A. Guidotti, V. Icolari, D. Tarchi, A. Vanelli-Coralli, S. Sharma, E. Lagunas, S. Maleki, S. Chatzinotas, J. Grotz, J. Krause, E. Corbel, B. Evans, P. Thompson
The Digital Agenda for Europe (DAE) sets forth ambitious requirements for broadband communications, in which Satellite Communications (SatCom) play a major role. In this context, spectrum sharing techniques offer unprecedented opportunities to increase capacity and reduce costs in order to allow SatCom to meet the DAE objectives. The EU FP7 Project CoRaSat is assessing Cognitive Radio (CR) techniques for Ka-band SatCom scenarios, showing that coexistence between Fixed Satellite Service (FSS) and Broadcasting Satellite System (BSS)/Fixed Service (FS) links would introduce significant benefits in non-exclusive frequency bands. In this paper, spectrum awareness and exploitation techniques are analyzed. Simulation results show that significant improvements can be obtained in both spectrum utilization (up to 2.4 GHz of additional spectrum) and available throughput (up to 600% increase).
{"title":"Spectrum awareness and exploitation for Cognitive Radio Satellite Communications","authors":"A. Guidotti, V. Icolari, D. Tarchi, A. Vanelli-Coralli, S. Sharma, E. Lagunas, S. Maleki, S. Chatzinotas, J. Grotz, J. Krause, E. Corbel, B. Evans, P. Thompson","doi":"10.1109/EUCNC.2015.7194032","DOIUrl":"https://doi.org/10.1109/EUCNC.2015.7194032","url":null,"abstract":"The Digital Agenda for Europe (DAE) sets forth ambitious requirements for broadband communications, in which Satellite Communications (SatCom) play a major role. In this context, spectrum sharing techniques offer unprecedented opportunities to increase capacity and reduce costs in order to allow SatCom to meet the DAE objectives. The EU FP7 Project CoRaSat is assessing Cognitive Radio (CR) techniques for Ka-band SatCom scenarios, showing that coexistence between Fixed Satellite Service (FSS) and Broadcasting Satellite System (BSS)/Fixed Service (FS) links would introduce significant benefits in non-exclusive frequency bands. In this paper, spectrum awareness and exploitation techniques are analyzed. Simulation results show that significant improvements can be obtained in both spectrum utilization (up to 2.4 GHz of additional spectrum) and available throughput (up to 600% increase).","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126079399","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194108
Pål Grønsund, K. Mahmood, G. Millstein, Ariel Noy, Gadi Solomon, A. Sahai
Today operators deploy functions like Deep Packet Inspection, Caches, traffic optimization, NAT and Firewall on the SGi/Gi-LAN for subscribers accessing Internet based content/services. Currently these functions are deployed on dedicated hardware components from different vendors that most often need to be managed separately. This is not cost efficient and gives long lead times for new services. The main contribution of this paper is the implementation of a solution for virtualizing the services on the SGi-LAN using NFV and SDN. The virtualized services include TCP optimization, video optimization and network analytics. In addition, a performance evaluation is presented with focus on key indicators for virtualization. It is shown that virtualizing network functions on servers using NFV adds an overhead of 20-40 μ seconds in latency per hop, but that the impact on the network function performance is negligible. It is also shown that a COTS server can support a single instance of the SDN controller programming 100K OpenFlow transactions/second and that a software switch can implement 100K rules/sec while forwarding traffic at 160 Gbps with 200M rules. To evaluate the scaling feature of NFV it is shown that the time to bring up a new virtual network function was between 90-120 seconds.
{"title":"A solution for SGi-LAN services virtualization using NFV and SDN","authors":"Pål Grønsund, K. Mahmood, G. Millstein, Ariel Noy, Gadi Solomon, A. Sahai","doi":"10.1109/EuCNC.2015.7194108","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194108","url":null,"abstract":"Today operators deploy functions like Deep Packet Inspection, Caches, traffic optimization, NAT and Firewall on the SGi/Gi-LAN for subscribers accessing Internet based content/services. Currently these functions are deployed on dedicated hardware components from different vendors that most often need to be managed separately. This is not cost efficient and gives long lead times for new services. The main contribution of this paper is the implementation of a solution for virtualizing the services on the SGi-LAN using NFV and SDN. The virtualized services include TCP optimization, video optimization and network analytics. In addition, a performance evaluation is presented with focus on key indicators for virtualization. It is shown that virtualizing network functions on servers using NFV adds an overhead of 20-40 μ seconds in latency per hop, but that the impact on the network function performance is negligible. It is also shown that a COTS server can support a single instance of the SDN controller programming 100K OpenFlow transactions/second and that a software switch can implement 100K rules/sec while forwarding traffic at 160 Gbps with 200M rules. To evaluate the scaling feature of NFV it is shown that the time to bring up a new virtual network function was between 90-120 seconds.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130133953","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194066
A. Morgado, Á. Gomes, V. Frascolla, K. Ntougias, C. Papadias, D. Slock, E. Avdic, N. Marchetti, Nathalie Haziza, H. Anouar, Yang Yang, M. Pesavento, F. Khan, T. Ratnarajah
Exploiting additional radio spectrum is key to respond to the unprecedented capacity demands of mobile broadband communication systems in recent years. In fact, most of the frequency bands suitable for mobile communications are already in use by other radio services, and spectrum refarming is usually not possible or constitutes a highly time-consuming procedure. At the same time, several field measurement campaigns have shown that the occupied spectrum below 6GHz is severely underutilized, i.e. there exist “spectrum holes” in the time, frequency, and space dimensions, pointing to the possibility of using spectrum sharing as a mean to better exploit additional spectral resources. Licensed shared access (LSA) is a recent spectrum licensing paradigm that allows licensees to share the licensed spectrum of incumbents without causing harmful interference and ensuring a certain quality-of-service (QoS) for both types of players. The EU-funded project ADEL aims to enhance the current LSA paradigm by introducing 1) dynamic radio resource management (RRM), 2) sensing reasoning, based on database-assisted collaborative sensor networking, and 3) an extension to the LSA architecture that allows a more effective RRM, increasing QoS satisfaction and policy enforcement for all players, finally leading to an overall improved spectrum utilization. The key features of ADEL's enhanced LSA paradigm are outlined throughout the remainder of this paper.
{"title":"Dynamic LSA for 5G networks the ADEL perspective","authors":"A. Morgado, Á. Gomes, V. Frascolla, K. Ntougias, C. Papadias, D. Slock, E. Avdic, N. Marchetti, Nathalie Haziza, H. Anouar, Yang Yang, M. Pesavento, F. Khan, T. Ratnarajah","doi":"10.1109/EuCNC.2015.7194066","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194066","url":null,"abstract":"Exploiting additional radio spectrum is key to respond to the unprecedented capacity demands of mobile broadband communication systems in recent years. In fact, most of the frequency bands suitable for mobile communications are already in use by other radio services, and spectrum refarming is usually not possible or constitutes a highly time-consuming procedure. At the same time, several field measurement campaigns have shown that the occupied spectrum below 6GHz is severely underutilized, i.e. there exist “spectrum holes” in the time, frequency, and space dimensions, pointing to the possibility of using spectrum sharing as a mean to better exploit additional spectral resources. Licensed shared access (LSA) is a recent spectrum licensing paradigm that allows licensees to share the licensed spectrum of incumbents without causing harmful interference and ensuring a certain quality-of-service (QoS) for both types of players. The EU-funded project ADEL aims to enhance the current LSA paradigm by introducing 1) dynamic radio resource management (RRM), 2) sensing reasoning, based on database-assisted collaborative sensor networking, and 3) an extension to the LSA architecture that allows a more effective RRM, increasing QoS satisfaction and policy enforcement for all players, finally leading to an overall improved spectrum utilization. The key features of ADEL's enhanced LSA paradigm are outlined throughout the remainder of this paper.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129028650","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194084
D. Simmons, J. Coon
We consider the problem of allocating power among the nodes of a two-way amplify-and-forward OFDM-based relay network employing physical layer network coding. Because of the large peak-to-average power ratios that occur at the relay of such systems, we deem it important to understand the negative effects that nonlinear transmissions might have at the relay. Thus, we assume that the relay is subject to its own independent transmit power constraint, beyond which nonlinear distortion is introduced. We consider two power allocation problems: 1) the transmit power budget of the communicating nodes is independent of the relay's transmit power, 2) the relay's transmit power is included within the total power budget of the network. For the former, a closed form solution is obtained. For the latter, the problem is shown to be non-convex in its standard form. By applying a substitution, we show that it can be converted into a convex problem. Numerical results are provided to demonstrate the efficacy of our methods. Finally, a discussion is included to give further insight into how our power allocation scheme behaves as a function of the network's asymmetry.
{"title":"Two-way OFDM-based nonlinear amplify-and-forward relaying: Power allocation","authors":"D. Simmons, J. Coon","doi":"10.1109/EuCNC.2015.7194084","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194084","url":null,"abstract":"We consider the problem of allocating power among the nodes of a two-way amplify-and-forward OFDM-based relay network employing physical layer network coding. Because of the large peak-to-average power ratios that occur at the relay of such systems, we deem it important to understand the negative effects that nonlinear transmissions might have at the relay. Thus, we assume that the relay is subject to its own independent transmit power constraint, beyond which nonlinear distortion is introduced. We consider two power allocation problems: 1) the transmit power budget of the communicating nodes is independent of the relay's transmit power, 2) the relay's transmit power is included within the total power budget of the network. For the former, a closed form solution is obtained. For the latter, the problem is shown to be non-convex in its standard form. By applying a substitution, we show that it can be converted into a convex problem. Numerical results are provided to demonstrate the efficacy of our methods. Finally, a discussion is included to give further insight into how our power allocation scheme behaves as a function of the network's asymmetry.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133839011","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194082
Zhanji Wu, Chengxin Jiang
For full-data exchange multi-way relay channels, a novel efficient multi-way relay network coding scheme is proposed. It is based on multi-stage two-way network coding, which is low-complexity and high reliable. For the channel without noise, the throughput per node per channel is increased by 50 % compared to plain routing, and even by 12.5% compared to the binary-signaling network coding scheme. Besides, due to the simple nature of 3-pulse amplitude modulation (3-PAM), it has much lower complexity and much higher reliability compared to the binary-signaling network coding scheme. Both theoretical analysis and computer simulations prove such throughput gain. On the additive white Gaussian noise (AWGN) channel, low density parity check (LDPC) codes are utilized in this scheme to improve the reliability. The simulation results show that the signal-to-noise ratio (SNR) gains to reference scheme increase as the number of the source nodes increases, and the SNR gains of the LDPC-coding scheme are even bigger than the uncoding scheme.
{"title":"A simple and efficient multi-way relay network coding scheme","authors":"Zhanji Wu, Chengxin Jiang","doi":"10.1109/EuCNC.2015.7194082","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194082","url":null,"abstract":"For full-data exchange multi-way relay channels, a novel efficient multi-way relay network coding scheme is proposed. It is based on multi-stage two-way network coding, which is low-complexity and high reliable. For the channel without noise, the throughput per node per channel is increased by 50 % compared to plain routing, and even by 12.5% compared to the binary-signaling network coding scheme. Besides, due to the simple nature of 3-pulse amplitude modulation (3-PAM), it has much lower complexity and much higher reliability compared to the binary-signaling network coding scheme. Both theoretical analysis and computer simulations prove such throughput gain. On the additive white Gaussian noise (AWGN) channel, low density parity check (LDPC) codes are utilized in this scheme to improve the reliability. The simulation results show that the signal-to-noise ratio (SNR) gains to reference scheme increase as the number of the source nodes increases, and the SNR gains of the LDPC-coding scheme are even bigger than the uncoding scheme.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131441094","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194040
M. Molu, A. Burr
Assuming statistical Channel State Information (CSI) available at the relay, the performance of a dual-hop MIMO relay network is studied in this paper. The cumulative density function (cdf) of received SNR at destination is studied and closed-form expressions are derived for the asymptotic cases of fully-correlated and non-correlated scenarios; moreover, the statistical characteristics of the SNR is further studied and an approximate cdf of the SNR is derived for arbitrary correlation. Then, a simple power allocation algorithm is proposed which is called “proportional power allocation”. The algorithm is explained in detail for the case of two antennas and three antennas at the relay. The simulation show excellent agreement between the proposed algorithm and optimal solution that is obtained by exhaustive search.
{"title":"Performance analysis of multi-antenna relay systems with statistical Channel State Information at the relay","authors":"M. Molu, A. Burr","doi":"10.1109/EuCNC.2015.7194040","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194040","url":null,"abstract":"Assuming statistical Channel State Information (CSI) available at the relay, the performance of a dual-hop MIMO relay network is studied in this paper. The cumulative density function (cdf) of received SNR at destination is studied and closed-form expressions are derived for the asymptotic cases of fully-correlated and non-correlated scenarios; moreover, the statistical characteristics of the SNR is further studied and an approximate cdf of the SNR is derived for arbitrary correlation. Then, a simple power allocation algorithm is proposed which is called “proportional power allocation”. The algorithm is explained in detail for the case of two antennas and three antennas at the relay. The simulation show excellent agreement between the proposed algorithm and optimal solution that is obtained by exhaustive search.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120839832","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194031
A. Cirik, K. Rikkinen, Y. Rong, T. Ratnarajah
In this paper, we focus on subcarrier and power allocation for an orthogonal frequency division multiple access (OFDMA) full-duplex (FD) system. A three-step algorithm is proposed to maximize the sum-rate of the system subject to individual rate constraints at the uplink and downlink users, and transmit power constraints at the base station (BS) and uplink users. The steps are: 1) Subcarrier allocation that considers user target rate requirements, 2) residual subcarrier allocation that further increases the sum rate, and 3) power allocation based on iterative water-filling (IWF). Simulation results reveal that the proposed FD scheduling improves the sum-rate over the traditional half-duplex (HD) and round-robin (RR) scheduling significantly under the self-interference cancellation levels that has been recently achieved.
{"title":"A subcarrier and power allocation algorithm for OFDMA full-duplex systems","authors":"A. Cirik, K. Rikkinen, Y. Rong, T. Ratnarajah","doi":"10.1109/EuCNC.2015.7194031","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194031","url":null,"abstract":"In this paper, we focus on subcarrier and power allocation for an orthogonal frequency division multiple access (OFDMA) full-duplex (FD) system. A three-step algorithm is proposed to maximize the sum-rate of the system subject to individual rate constraints at the uplink and downlink users, and transmit power constraints at the base station (BS) and uplink users. The steps are: 1) Subcarrier allocation that considers user target rate requirements, 2) residual subcarrier allocation that further increases the sum rate, and 3) power allocation based on iterative water-filling (IWF). Simulation results reveal that the proposed FD scheduling improves the sum-rate over the traditional half-duplex (HD) and round-robin (RR) scheduling significantly under the self-interference cancellation levels that has been recently achieved.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121075306","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194078
M. Lema, M. García-Lozano, S. Ruiz-Boqué
Carrier Aggregation is an important feature in Long Term Evolution Advanced (LTE-A). It allows operators to provide larger operational bandwidths without the need of having a contiguous, large piece of spectrum. However, an increased bandwidth also needs a larger channel sounding to obtain channel state information (CSI), required for frequency domain scheduling and link adaptation. This constitutes a serious challenge for the uplink since wideband sounding reference signals cannot be transmitted by cell edge (power limited) users and hopped sounding requires a long time to sweep the entire transmission band, thus leading to outdated and less reliable CSI. Also, average interference and its variation in time can seriously jeopardize the CSI at the eNodeB. In this paper, we present an integration of inter cell interference coordination with CSI reporting by reducing the interference variability through controlled allocations. Results show that the entire CSI accuracy can be improved and so does the overall cell performance.
{"title":"Interference coordination method for CSI improvement in LTE uplink with Carrier Aggregation","authors":"M. Lema, M. García-Lozano, S. Ruiz-Boqué","doi":"10.1109/EuCNC.2015.7194078","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194078","url":null,"abstract":"Carrier Aggregation is an important feature in Long Term Evolution Advanced (LTE-A). It allows operators to provide larger operational bandwidths without the need of having a contiguous, large piece of spectrum. However, an increased bandwidth also needs a larger channel sounding to obtain channel state information (CSI), required for frequency domain scheduling and link adaptation. This constitutes a serious challenge for the uplink since wideband sounding reference signals cannot be transmitted by cell edge (power limited) users and hopped sounding requires a long time to sweep the entire transmission band, thus leading to outdated and less reliable CSI. Also, average interference and its variation in time can seriously jeopardize the CSI at the eNodeB. In this paper, we present an integration of inter cell interference coordination with CSI reporting by reducing the interference variability through controlled allocations. Results show that the entire CSI accuracy can be improved and so does the overall cell performance.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123378825","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194089
Mohammed Ridouani, A. Hayar, A. Haqiq
The next-generation 5G networks will integrate two technologies, cognitive radio and cooperative communication, which use radio spectrum opportunistically and efficiently, in addition, they enhance the reliability and the capacity of the system. In this paper, we present a novel power control scheme based on a relaxed constraint at cognitive relay network under both the outage probability limit (OPL) of the primary system and the interference constraint limit (ICL). We show how to transform the optimization problem of the condition on the OPL and the ICL into a condition on the channel, so that the cognitive user observes the channel from cognitive source to primary receiver, and control its transmit power based on the channel condition. We derive the closed-form expressions of the outage probabilities over independent but not necessarily identically distributed Nakagami-m fading channels. By using the theoretical analysis and from the numerical results, firstly, we show that the proposed power control scheme which based on both the OPL and the ICL achieves better performance in underlay spectrum rather than the traditional which based only on the interference constraints. Secondary, we show that the proposed scheme allows lower power consumption at cognitive side while the performance of cognitive relay network is improved and the QoS of primary system is guaranteed in parallel.
{"title":"Relaxed constraint at cognitive relay network under both the outage probability of the primary system and the interference constraint","authors":"Mohammed Ridouani, A. Hayar, A. Haqiq","doi":"10.1109/EuCNC.2015.7194089","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194089","url":null,"abstract":"The next-generation 5G networks will integrate two technologies, cognitive radio and cooperative communication, which use radio spectrum opportunistically and efficiently, in addition, they enhance the reliability and the capacity of the system. In this paper, we present a novel power control scheme based on a relaxed constraint at cognitive relay network under both the outage probability limit (OPL) of the primary system and the interference constraint limit (ICL). We show how to transform the optimization problem of the condition on the OPL and the ICL into a condition on the channel, so that the cognitive user observes the channel from cognitive source to primary receiver, and control its transmit power based on the channel condition. We derive the closed-form expressions of the outage probabilities over independent but not necessarily identically distributed Nakagami-m fading channels. By using the theoretical analysis and from the numerical results, firstly, we show that the proposed power control scheme which based on both the OPL and the ICL achieves better performance in underlay spectrum rather than the traditional which based only on the interference constraints. Secondary, we show that the proposed scheme allows lower power consumption at cognitive side while the performance of cognitive relay network is improved and the QoS of primary system is guaranteed in parallel.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116908007","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 : 2015-08-13DOI: 10.1109/EuCNC.2015.7194036
Youngmin Jeong, Hyundong Shin, M. Win
In this paper, we develop a unifying H-transform analysis for the channel capacity in H-fading and degree-2 irregular H-fading using the new systematic language of transcendental H-functions. By virtue of Mellin and convolution operations involved in the Mellin transform and Mellin convolution of two H-functions, the H-transform for the channel capacity culminate in again H-functions. Using the algebraic asymptotic expansions of the H-transform, we further quantify the high signal-to-noise-ratio (SNR) power offset and the low SNR slope of the capacity in a unified manner.
{"title":"H-transforms for channel capacity","authors":"Youngmin Jeong, Hyundong Shin, M. Win","doi":"10.1109/EuCNC.2015.7194036","DOIUrl":"https://doi.org/10.1109/EuCNC.2015.7194036","url":null,"abstract":"In this paper, we develop a unifying H-transform analysis for the channel capacity in H-fading and degree-2 irregular H-fading using the new systematic language of transcendental H-functions. By virtue of Mellin and convolution operations involved in the Mellin transform and Mellin convolution of two H-functions, the H-transform for the channel capacity culminate in again H-functions. Using the algebraic asymptotic expansions of the H-transform, we further quantify the high signal-to-noise-ratio (SNR) power offset and the low SNR slope of the capacity in a unified manner.","PeriodicalId":310313,"journal":{"name":"2015 European Conference on Networks and Communications (EuCNC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126974895","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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