Zahran Hajji, K. Amis, A. Aïssa-El-Bey, F. Abdelkefi
{"title":"Low-complexity half-sparse decomposition-based detection for massive MIMO transmission","authors":"Zahran Hajji, K. Amis, A. Aïssa-El-Bey, F. Abdelkefi","doi":"10.1109/COMNET.2015.7566636","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566636","url":null,"abstract":"This paper focuses on low-complexity detection for large scale multiple-input multiple-output (MIMO) systems involving tens to hundreds of transmit/receive antennas. Due to the exponential increase of its processing complexity with the data signal dimensions (antenna number, modulation order), a maximum likelihood detection is infeasible in practice. To overcome this drawback, authors in [1] proposed a low-complexity detection based on a sparse decomposition of the information vector. It is proved that this decomposition is mainly adpated to underdetermined systems and leads to a significant reduction on the processing complexity. As an extension to the work investigated in [1], we propose in this paper a new decomposition that makes the computation cost less dependent on the modulation alphabet cardinality, thus reducing theoretically the complexity by 50% for 4-QAM and by 72% for 16-QAM compared to the previous detector in [1], while achieving the same error rate performance.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124852785","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}
Fanny Jardel, J. Boutros, Volkan Dedeoglu, M. Sarkiss, G. R. Othman
{"title":"Spatial coupling for distributed storage and diversity applications","authors":"Fanny Jardel, J. Boutros, Volkan Dedeoglu, M. Sarkiss, G. R. Othman","doi":"10.1109/COMNET.2015.7566624","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566624","url":null,"abstract":"Low-density parity-check codes are considered for erasure channels, mainly Root-LDPC codes that include a special type of checknodes. Spatial coupling is applied on parity bits of a Root-LDPC ensemble designed for a channel with 4 block-erasure states and a maximal design rate of 3/4 attaining double diversity. The advantage of spatial coupling is shown in the erasure plane as an improvement of a threshold boundary, under independent erasures. The spatial coupling maintains the double diversity because it connects parity bits only. The drawback of this partial coupling is a weak saturation of the threshold boundary towards the capacity boundary.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122511239","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}
{"title":"Study of relay energy optimization in a Cooperative ARQ scheme based on Analog Network Coding","authors":"Mariem Ayedi, N. Sellami, M. Siala","doi":"10.1109/COMNET.2015.7566621","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566621","url":null,"abstract":"In this paper, we propose to optimize the distribution of the average relay energy in a Cooperative Automatic Repeat reQuest (C-ARQ) scheme. We consider wireless transmissions over Rayleigh fading channels between two sources nodes, one relay node and one destination node. We propose to use specific relay and destination treatment for different possible cases. When only one received packet is detected erroneous, the relay retransmits it and the detection is based on the Maximum Ratio Combining (MRC). When both received packets are detected erroneous, the relay retransmits the combination of both packets and the Minimum Mean Square Error (MMSE) is used for packets detection. We propose to allocate to the relay different energies according to the number of retransmitted packets and also according to the retransmission number. Thus, we find the optimal relay energy distribution which maximizes the system throughput under constraints on the maximum transmitted energies. To do this, we derive semi-analytical bounds of the throughput and the average relay energy. Numerical results show that the relay energy optimization leads to a significant improvement compared to the fixed allocation relay energy scheme.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114219456","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}
{"title":"Joint Urgency Delay scheduler and adaptive aggregation technique in IEEE 802.11n networks","authors":"Emna Charfi, L. Chaari, L. Kamoun","doi":"10.1109/COMNET.2015.7566637","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566637","url":null,"abstract":"The aggregation technique was defined by IEEE 802.11n, and used later by IEEE 802.11ac. This technique combines numerous packets into a single transmission. Hence, the throughput is improved since the overhead associated with each transmission is reduced. However, the delay is increased in the case of low rate application and large size of aggregated frame. In this paper, we propose new scheduling algorithm based on urgency delay and an adaptive frame aggregation technique to obtain an optimal trade-off between maximizing throughput and minimizing delay. Packets are scheduled based on Urgency Delay (UD) as well as Waiting Delay (WD). Packets having the lowest UD are firstly served to be included in the aggregated frame. Then, the payload size of aggregated frame will be adjusted based on the same metric of the first sub-frame. Simulation results prove that the serving delay and packet loss are widely reduced, and the average throughput is improved.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130151000","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}
{"title":"Downlink scheduling for real time application over LTE-A network: Delay aware scheduling","authors":"Saloua Hendaoui, N. Zangar, S. Tabbane","doi":"10.1109/COMNET.2015.7566615","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566615","url":null,"abstract":"In this paper, we study the LTE-A (Long Term Evolution Advanced) downlink scheduling. Delay aware schedulers are among the popular schedulers presented in the literature. These schedulers are based on fix and exact delay budget. Nevertheless, wireless channels are quickly modified which make fix delays not effective. Several contributions, based on fuzzy logic method, are presented in the literature. Nevertheless, these schedulers have a high cost in term of complexity and computations.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130440898","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}
{"title":"A protocol based on D2D cooperation for FDD massive MIMO communications without instantaneous CSI feedback","authors":"L. Cottatellucci, Samah A. M. Ghanem","doi":"10.1109/COMNET.2015.7566633","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566633","url":null,"abstract":"We propose a novel protocol for fast fading massive MIMO systems in Frequency Division Duplex (FDD) mode and, in general, non-reciprocal channels. Our approach relies on Device-to-Device (D2D) cooperation to avoid instantaneous channel state information (CSI) feedback, unaffordable in practical systems. This protocol assumes that clusters of user terminals (UT) cooperate to create virtual MIMO at a target UT via D2D cooperation. The base station (BS) has statistical knowledge of the downlink channel and it is aware of the cooperation but it is oblivious of the statistics of the D2D links and the transmitter is designed based on the downlink channel statistics solely. The performance of the proposed protocol is analyzed and compared to state-of-art schemes based on instantaneous CSI feedback.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123183414","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}
{"title":"Efficient embedded signaling through DCT precoding matrix for SLM method in OFDM system","authors":"Mouna Sghaier, F. Abdelkefi, M. Siala","doi":"10.1109/COMNET.2015.7566625","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566625","url":null,"abstract":"Orthogonal frequency division multiplexing (OFDM) modulation technique is a promising transmission scheme for high performance broadband wireless communications. However, as a drawback, this scheme suffers from the high peak to average power ratio (PAPR) of the output signals. In order to overcome this issue, several methods requiring the transmission of side information SI bits have been proposed. The transmitted bits must be channel-encoded as they are particularly critical to the error performance of the OFDM system. This fact results in a high increase of the system complexity. Additionally, the wrong estimation of the SI leads to the damage on the total signal recovery and the loss of the entire OFDM sequence. For these reasons, we propose in this paper, a new robust technique based on selected mapping (SLM) scheme. The proposed method is based on a new form of embedded signaling such as the use of the discrete cosinus transform (DCT). Furthermore, we employ an optimized scheme during the estimation process, using the higher order statistics moments. Simulation results are given to illustrate the good performance of our proposed method and support our claim.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"333 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121837147","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}
{"title":"VHO decision using a fuzzy reverse MLP with Reinforcement Learning","authors":"A. B. Zineb, M. Ayadi, S. Tabbane","doi":"10.1109/COMNET.2015.7566641","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566641","url":null,"abstract":"Next generation mobile networks are envisioned to be heterogeneous with an increase in demand towards ubiquitous video applications. As various networks have widely different characteristics, it is difficult to maintain the quality of service (QoS) after executing a handover from one network to another. Moreover, maintaining a good user perception level “quality of experience” (QoE), based on video applications, during the handover needs an intelligent handoff decision mechanism. In this paper, a multi-criteria vertical handover algorithm enhancing the handover performance is proposed. This algorithm is based on a fuzzy neural optimized approach. Fuzzy logic controllers (FLC) takes into account multiple relevant criteria and rules based on prior knowledge of the network. A multi-layer perceptron (MLP) neural network is trained in order to learn the relationship between FLC parameters and QoS/QoE scheme. Then, MLP inversion is performed in order to obtain the optimal parameters of the membership functions starting from QoS/QoE objective values. Performances of proposed algorithm are evaluated and compared to other algorithms without the reverse technique. Results show improvement on network performances.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124862779","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}
{"title":"Precoded filtered multitone with overlapping subcarriers for 5G communication systems","authors":"S. Tomasin, A. Zaidi","doi":"10.1109/COMNET.2015.7566631","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566631","url":null,"abstract":"Filtered multitone (FMT) modulation is a promising candidate for the downlink of 5G communication systems, due to its higher spectral efficiency with respect to solutions currently adopted in 4/4.5G systems. However, design of selective FMT filters is a challenging task and their use can significantly increase implementation complexity. In this paper we propose to relax the filter design constraints by allowing partial inter channel interference (ICI). At the same time we propose to use a Tomlinson-Harashima precoding (THP) precoder to remove ICI at the transmitter, thus allowing for a simple implementation of the mobile terminal. Moreover, a bidirectional THP is considered, where the cascade of two THP structures is adopted along the subcarriers. Numerical results on relevant mobile communication scenario support the effectiveness of the proposed solution.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128035891","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}
{"title":"A hybrid distribution for highly right skewed data","authors":"Nehla Debbabi, M. Kratz, S. E. Asmi","doi":"10.1109/COMNET.2015.7566619","DOIUrl":"https://doi.org/10.1109/COMNET.2015.7566619","url":null,"abstract":"A non-uniform weighted two-components distribution is proposed in the present study for highly right skewed data modeling. We consider a G-GPD model that links a Gaussian distribution to a Generalized Pareto Distribution (GPD) at a junction point, with different weights for each component. It improves a G-GPD model with uniform weights that had been introduced in a preliminary study (see [1]). An iterative algorithm for parameters estimation is then provided, offering an accurate estimation of the Gaussian and GPD parameters, a judicious weighting of the model as well as a reliable position of the junction point, determined successfully in an unsupervised way. The performance of the iterative algorithm and the underlying new distribution, as compared with the existing G-GPD model, is studied on generated data and then on real extracellular neural recordings.","PeriodicalId":314139,"journal":{"name":"2015 5th International Conference on Communications and Networking (COMNET)","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116432608","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}