Chao He, Yang Liu, G. Arrobo, T. Ketterl, R. Gitlin
{"title":"In vivo wireless communications and networking","authors":"Chao He, Yang Liu, G. Arrobo, T. Ketterl, R. Gitlin","doi":"10.1109/ITA.2015.7308982","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308982","url":null,"abstract":"In vivo wireless communications and networking of biomedical devices has the potential of being a critical component in advancing health care delivery. Such systems offer the promise of improving the effectiveness of sophisticated cyber-physical biomedical systems. This paper provides an overview of our research on characterizing the in vivo wireless channel and contrasting this channel with the familiar cellular and WLAN channels. Characterization of the in vivo channel is still in its infancy, but the importance of obtaining accurate channel models is essential to the design of efficient communication systems and network protocols to support advanced biomedical applications. We describe our initial research on signal processing matched to the in vivo channel including MIMO in vivo and Cooperative Network Coding [CNC] systems. MIMO in vivo 2×2 systems demonstrate substantial performance improvement relative to SISO arrangements that significantly depends on antenna location. MIMO makes it possible to achieve the target data rate of 100 Mbps, with maximum SAR [Specific Absorption Rate] levels met. Furthermore, it is found that, to satisfy the maximum allowed SAR, a larger bandwidth may, but not necessarily, increase the system capacity. Also, we discuss the ability of Cooperative Network Coding [CNC] to increase the reliability (especially for real-time applications), provide transparent self-healing, and enhance the expected number of correctly received and decoded packets at the WBAN destination, while transmitting at low power. Because of the real-time nature of many of these medical applications and the fact that many sensors can only transmit, error detection and retransmission (i.e., ARQ) is not a preferred option. CNC requires about 3.5 dB less energy per bit than extant WBAN systems that do not use cooperation or network coding.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133017365","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":"Quantum teleportation over hyper entangled states","authors":"Ankur Raina, S. G. Srinivasa","doi":"10.1109/ITA.2015.7308996","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308996","url":null,"abstract":"Teleportation is a well known protocol to transfer one qubit between users sharing a Bell pair. By treating teleportation as a transfer of qubits between end users sharing a virtual quantum channel, we derive the maximum coherent information of this virtual quantum channel under noisy classical channel existing between the end users. We also study various communication scenarios using hyper entangled states and quantify the advantages over a single degree of freedom.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121816499","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":"Coded caching under arbitrary popularity distributions","authors":"Jinbei Zhang, Xiaojun Lin, Xinbing Wang","doi":"10.1109/ITA.2015.7308972","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308972","url":null,"abstract":"Caching plays an important role in reducing the backbone traffic when serving high-volume multimedia content. Recently, a new class of coded caching schemes have received significant interest because they can exploit coded multi-cast opportunities to further reduce backbone traffic. Without considering file popularity, prior works have characterized the fundamental performance limits of coded caching through a deterministic worst-case analysis. However, when heterogeneous file popularity is taken into account, there remain open questions regarding the fundamental limits of coded caching performance. In this work, for an arbitrary popularity distribution, we first derive a new information-theoretical lower bound on the expected transmission rate of any coded caching schemes. We then show that a simple coded-caching scheme attains an expected transmission rate that is at most a constant factor away from the lower bound (except a small additive term). Unlike other existing studies, the constant factor that we derived is independent of the popularity distribution.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131010578","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":"Neural mass spatio-temporal modeling from high-density electrode array recordings","authors":"A. Fletcher, J. Viventi, S. Rangan","doi":"10.1109/ITA.2015.7309007","DOIUrl":"https://doi.org/10.1109/ITA.2015.7309007","url":null,"abstract":"Neural mass models provide an attractive framework for modeling complex behavior in cortical circuits. The models are based on describing the dynamics of large neural populations through the space and time evolution of a small number of key aggregate statistical quantities. Fitting these models to electrode array recordings can provide insight into connectivity and structure of neural circuits as well as the response of these circuits to stimuli. However, neural mass models are fundamentally nonlinear dynamical systems with large numbers of hidden states, and validating the models on actual recordings and estimating the key parameters remains challenging. This work proposes a novel method for systematically identifying neural mass models that is particularly well-suited for high-density micro-electrocorticographic (μECoG) data. The methodology requires minimal assumptions on the model, and can automatically uncover the underlying components in the neural populations We discuss possible applications to in vivo recordings from feline visual cortex using a recently-developed, high-density 360 contact flexible electrode array with 500 μm inter-electrode spacing.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"295 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133103876","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":"Spatially-coupled low-density parity check codes: Zigzag-window decoding and code-family design considerations","authors":"S. Abu-Surra, Eran Pisek, R. Taori","doi":"10.1109/ITA.2015.7309001","DOIUrl":"https://doi.org/10.1109/ITA.2015.7309001","url":null,"abstract":"Spatially-coupled low-density parity-check (SC-LDPC) codes are new capacity-achieving codes, which combine the advantages of both convolutional-turbo codes and LDPC block codes. SC-LDPC codes can provide scalable code-length, high granularity, convolutional-gain, low-complexity decoding, and high parallel processing. To overcome the limitations of the current SC-LDPC decoders which have essentially hindered the widespread adoption of SC-LDPC, we propose a new decoder which we call the Zigzag Decoder, that essentially leverages the convolutional-gain of the sliding window decoder. We show that the zigzag-window decoder reduces the average number of iterations and improves the performance relative to the conventional sliding-window decoder. Furthermore, for facilitating the use of SC-LDPC codes in practice, we have explored how to generate SC-LDPC code families and compare the performance and complexity between shortening-based and puncturing-based SC-LDPC code families supporting different code rates.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124769352","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":"Compressive sensing based pilot reduction technique for massive MIMO systems","authors":"J. Choi, B. Shim","doi":"10.1109/ITA.2015.7308974","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308974","url":null,"abstract":"Massive multi-input multi-output (MIMO) technique deploys a number of transmit antennas in base-station (BS) to support large number of users and high data throughput. Since BS needs to acquire channel state information from all transmit antennas, substantial amount of downlink pilot signals is required. In this paper, we suggest a new downlink pilot allocation strategy, inspired by the compressed sensing principle, that reduces the density of the pilot significantly. Key observation in the proposed approach is that the sparse structure of the channel impulse response (CIR) tends to change slower than the OFDM symbol rate. Through computer simulations, we show that the proposed scheme outperforms the conventional compressed sensing methods, achieving the performance bound provided by the Oracle-based Kalman smoother.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126431562","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":"Offline Voice Activity Detector using speech supergaussianity","authors":"I. Tashev","doi":"10.1109/ITA.2015.7308991","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308991","url":null,"abstract":"Voice Activity Detectors (VAD) play important role in audio processing algorithms. Most of the algorithms are designed to be causal, i.e. to work in real time using only current and past audio samples. Off-line processing, when we have access to the entire voice utterance, allows using different type of approaches for increased precision. In this paper we propose an algorithm for off-line VAD based on the different probability density functions (PDFs) of the speech and noise. While a Gaussian distribution is a very good model for noise, the speech PDF is peakier. The proposed VAD algorithm works in frequency domain and estimates the speech signal presence probability for each frequency bin in each audio frame, the speech presence probability for each frame and also provides a binary decision per bin and frame. Provides improved precision compared to the streaming real-time VAD algorithms.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124341676","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":"Synchronization of phase-coupled oscillators with plastic coupling strength","authors":"Andrey Gushchin, Enrique Mallada, A. Tang","doi":"10.1109/ITA.2015.7309003","DOIUrl":"https://doi.org/10.1109/ITA.2015.7309003","url":null,"abstract":"In this article we study synchronization of systems of homogeneous phase-coupled oscillators with plastic coupling strengths and arbitrary underlying topology. The dynamics of a coupling strength between two oscillators is governed by the phase difference between these oscillators. We show that such systems are gradient and always achieve frequency synchronization. Moreover, for these systems we provide sufficient stability and instability conditions that are based on results from algebraic graph theory. For a special case when underlying topology is a tree, we formulate a criterion of stability for equilibria. Several examples are used to demonstrate variety of equilibria the system has, and to illustrate differences in behavior of systems with constant and plastic coupling strengths.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123906576","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":"Linear degrees of freedom of two-user MIMO broadcast channels with reconfigurable antennas in the absence of CSIT","authors":"Minho Yang, Sang-Woon Jeon, Dong Ku Kim","doi":"10.1109/ITA.2015.7308987","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308987","url":null,"abstract":"The degrees of freedom (DoF) of the two-user multiple-input and multiple-output (MIMO) broadcast channel (BC) without channel state information at the transmitter (CSIT) is studied, in which each receiver is equipped with reconfigurable antennas capable of choosing a subset of receiving modes from several preset modes. Under a general setting of arbitrary number of transmit antennas, receiving modes, and preset modes, the linear sum DoF is completely characterized by developing an optimal blind interference alignment scheme and obtaining a matching upper bound available for any linear coding strategy.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125393175","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":"Heat-aware transmission strategies","authors":"M. Levorato, N. Venkatasubramanian, N. Dutt","doi":"10.1109/ITA.2015.7308981","DOIUrl":"https://doi.org/10.1109/ITA.2015.7308981","url":null,"abstract":"A novel framework for the optimization of the transmission/interference strategy of secondary users in cognitive networks is proposed. The framework models the dynamics of the transmission protocols implemented by the wireless terminals, as well as the dynamics of important characteristics of the transmission circuitry such as on-board heat generation and temperature. By generating interference to the primary user's receiver, and cooperating with primary user's packet delivery, the secondary user biases the statistics of the primary user's packet service. As the activation of the transmission circuitry generates heat, the activity of the secondary user impacts the temporal evolution of the primary user's internal temperature. The framework, based Markov Decision Process theory, enables the optimization of the transmission strategy of the secondary user under constraints on the primary user's average throughput. Numerical results show that the activity of the secondary user is beneficial to the hardware state even when the secondary user only aims at maximizing its achieved throughput.","PeriodicalId":150850,"journal":{"name":"2015 Information Theory and Applications Workshop (ITA)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126774062","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}