{"title":"The application of SWIPT to a cooperative full duplex network","authors":"Zhuo Chen, P. Xu, Z. Ding, Xuchu Dai","doi":"10.1109/ISWCS.2015.7454378","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454378","url":null,"abstract":"This paper considers a cooperative simultaneous wireless information and power transfer (SWIPT) network with a source-destination pair and two full-duplex (FD) relays, where the two relays are powered by radio frequency signals from the source and forward the source messages to the destination. The amply-and-forward (AF) relaying protocol is studied. Specifically, we characterize the performance of the AF relaying protocol, and the outage probability is analyzed with a close-form expression. In addition, to avoid a zero diversity gain, a dynamic hybrid relaying scheme that switches between full-duplex and half-duplex relaying is applied to the FD relaying scenario. The impact of the hybrid relaying scheme is characterized via the analysis of the outage probability. An exact expression of the outage probability is provided, and its approximation is also analyzed. Such an approximation is shown to be accurate at high signal-to-noise ratio (SNR).","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"186 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128353899","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":"RIMAP: Receiver-initiated MAC protocol with Adaptive Polling Discipline","authors":"Fadhil Firyaguna, Marcelo M. Carvalho","doi":"10.1109/ISWCS.2015.7454458","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454458","url":null,"abstract":"This work introduces the Receiver-Initiated MAC with Adaptive Polling Discipline (RIMAP), a unicast MAC protocol that dynamically selects a polling discipline according to channel contention and link quality homogeneity to all neighbors. For that, two polling disciplines are considered: one that prioritizes nodes according to the likelihood of successful handshake (LSH), and another that targets throughput fairness among nodes, the proportional fair (PF) discipline. The adaptive behavior is controlled by two switching parameters that can be tuned to trade fairness with throughput-delay performance. To control its polling rate, RIMAP uses a reversed version of the binary exponential backoff (BEB) algorithm of the IEEE 802.11 DCF. Additionally, it implements a frame reordering technique that relax the need for data frames to reach the head of the queue in order to be transmitted, and a Nothing-To-Send (NTS) control frame to speed up polling rounds. RIMAP performance is evaluated with discrete-event simulations under topologies with hidden terminals, concurrent transmissions, and saturated traffic. Also, its performance is compared with the same BEB-based MAC protocol under fixed polling disciplines (LSH or PF only), as well as with the IEEE 802.11 DCF MAC, a representative of sender-initiated paradigms.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127217732","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":"On the effect of channel estimation errors in SC-FDE systems using widely linear iterative equalization","authors":"B. Chang, C. Rocha, L. Resende, D. L. Ruyet","doi":"10.1109/ISWCS.2015.7454400","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454400","url":null,"abstract":"In this paper the effect of channel estimation errors in single carrier systems using frequency domain widely linear iterative equalization is investigated. It was found out that when compared to their strictly linear versions their error performance is more robust with respect to these errors. They do not have the high error floor present in the error performance of strictly linear systems that do not take into account the channel estimation error into account; even when this error is considered their performance is slightly better.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125368153","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":"Opportunistic relay and jammer cooperation techniques for physical-layer security in buffer-aided relay networks","authors":"Xiaotao Lu, R. D. Lamare","doi":"10.1109/ISWCS.2015.7454437","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454437","url":null,"abstract":"In this paper, we investigate opportunistic relay and jammer cooperation schemes in multiple-input multiple-output (MIMO) buffer-aided relay networks. The network consists of one source, an arbitrary number of relay nodes, legitimate users and eavesdroppers, with the constraints of physical layer security. We propose an algorithm to select a set of relay nodes to enhance the legitimate users' transmission and another set of relay nodes to perform jamming of the eavesdroppers. With Inter-Relay interference (IRI) taken into account, interference cancellation can be implemented to assist the transmission of the legitimate users. Secondly, IRI can also be used to further increase the level of harm of the jamming signal to the eavesdroppers. By exploiting the fact that the jamming signal can be stored at the relay nodes, we also propose a hybrid algorithm to set a signal-to-interference and noise ratio (SINR) threshold at the node to determine the type of signal stored at the relay node. With this separation, the signals with high SINR are delivered to the users as conventional relay systems and the low SINR performance signals are stored as potential jamming signals. Simulation results show that the proposed techniques obtain a significant improvement in secrecy rate over previously reported algorithms.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122332499","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 unifying analysis of error exponents for MIMO channels with application to multiple-scattering","authors":"G. Alfano, C. Chiasserini, A. Nordio, Siyuan Zhou","doi":"10.1109/ISWCS.2015.7454355","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454355","url":null,"abstract":"Expressions for Gallager's Random Coding Error Exponent (RCEE) and the corresponding Expurgated Error Exponent (EEE) are derived in a unifying framework, as functions only of the squared singular values of the channel matrix. The results encompass spatially Kronecker-correlated Rayleigh channels (whose error exponents expressions are already present in the literature), line of sight MIMO systems, multiple-scattering channels, multi-hop amplify and forward MIMO channels with non-noisy relays and noisy destination. As an instance of application of our framework, we consider a multiple-scattering Rayleigh MIMO channels, with an arbitrary but finite number of scattering stages and channel state information (CSI) available at the receiver only. In this scenario, we evaluate closed-form expressions for both RCEE and EEE in terms of Meijer's G functions.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117025890","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":"MISO TX-power minimization under imperfect instantaneous CSIT","authors":"Samip Malla, G. Abreu","doi":"10.1109/ISWCS.2015.7454414","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454414","url":null,"abstract":"The signal to interference and noise ratio (SINR)-constrained transmit (TX)-power minimization problem, incorporating perfect and instantaneous channel state information at the transmitter (CSIT), culminates in higher overhead and extensive backhauling, likewise average CSIT suffers from quality fluctuations. Also, methods relying on the statistical SINR constraints require several algebraic steps in converting those constraints to deterministic convex equivalents. This process not only loosens the constraint of the problem, but also significantly subtracts the potential performance. In contrary to above mentioned procedures, we account for imperfect instantaneous CSIT and propose a simple solution based on Perron-Frobenius (PF) theorem and uplink-downlink duality to address the problem in a multi-user multiple input single output (MISO) system under prescribed outage. We derive accurate models for the distribution of true SINR experienced by the receivers subject to imperfect CSIT and conditioned on constraint-matching SINR estimates. Simulation results demonstrate the significant performance gain achieved by the proposed solution when compared with the state of the art.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124625277","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":"Reduced-complexity lattice spherical decoding","authors":"Asma Mejri, G. R. Othman","doi":"10.1109/ISWCS.2015.7454434","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454434","url":null,"abstract":"Lattice sequential decoders based on a spherical search region, such as the Sphere Decoder and the SB-Stack decoder, implement a tree-search strategy to find the ML solution while visiting only the lattice points that belong to a sphere of a predefined radius. Their computational complexity depends then critically on the choice of the initial sphere radius. We propose in this work novel initial sphere radius selection methods for spherical-region based sequential lattice decoders and show through simulations the complexity reduction allowed by such methods when the Sphere Decoder is used while maintaining ML performance.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121361687","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":"Uplink pilot and data power control for single cell massive MIMO systems with MRC","authors":"Hei Victor Cheng, Emil Björnson, E. Larsson","doi":"10.1109/ISWCS.2015.7454371","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454371","url":null,"abstract":"This paper considers the jointly optimal pilot and data power allocation in single cell uplink massive MIMO systems. A closed form solution for the optimal length of the training interval is derived. Using the spectral efficiency (SE) as performance metric and setting a total energy budget per coherence interval the power control is formulated as optimization problems for two different objective functions: the minimum SE among the users and the sum SE. The optimal power control policy is found for the case of maximizing the minimum SE by converting it to a geometric program (GP). Since maximizing the sum SE is an NP-hard problem, an efficient algorithm is developed for finding KKT (local maximum) points. Simulation results show the advantage of optimizing the power control over both pilot and data power, as compared to heuristic power control policies.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114339261","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}
Samira Homayouni, Cise Midoglu, P. Svoboda, M. Rupp
{"title":"Empirical KPIs for interfered WLAN","authors":"Samira Homayouni, Cise Midoglu, P. Svoboda, M. Rupp","doi":"10.1109/ISWCS.2015.7454416","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454416","url":null,"abstract":"The demand for fast, reliable and cost effective data transmission in home environments is ever increasing. Every new WLAN standard offers a higher data rate and better performance, at the cost of being more prone to interference. Interference mitigation techniques are not fully addressed in standard and leave room for improvement. Cross-technology interferers in ISM bands, such as microwave oven and video streaming, have a significant effect on the performance of these networks. In this paper, we investigate the impact of these interferers on 802.11n networks in a crowded 2.4 GHz band. We propose a repeatable test setup for conducting measurements with real-world interference sources. In order to allow for a comparison between WLAN devices, we propose a KPI-based performance assessment which is beneficial to evaluate the device under test.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114540043","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":"Proactive wireless caching at mobile user devices for energy efficiency","authors":"A. Gungor, Deniz Gündüz","doi":"10.1109/ISWCS.2015.7454325","DOIUrl":"https://doi.org/10.1109/ISWCS.2015.7454325","url":null,"abstract":"Proactive content caching at user terminals is studied from an energy efficiency perspective. Assuming that the variable-rate demands of a user can be predicted accurately over a certain time period, the optimal transmission strategy that minimizes the total energy consumption is characterized. The reduction in the energy consumption is obtained both by increasing the total transmission time of a request, and by downloading it at better channel conditions, rather than downloading it at the time of use. Both gains are possible thanks to the limited cache memory at the user device, in which the pre-downloaded content is stored until it is requested by the application layer, such as a video player. We formulate the optimal proactive transmission strategy as the solution of a convex optimization problem, and evaluate the minimum total energy requirement numerically. We also provide a backward water-filling interpretation for the optimal caching strategy.","PeriodicalId":383105,"journal":{"name":"2015 International Symposium on Wireless Communication Systems (ISWCS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125455674","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}