The Experts below are selected from a list of 4515441 Experts worldwide ranked by ideXlab platform
John D Matyjas - One of the best experts on this subject based on the ideXlab platform.
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all spectrum cognitive networking through joint distributed Channelization and routing
IEEE Transactions on Wireless Communications, 2013Co-Authors: Lei Ding, Stella N Batalama, Tommaso Melodia, Dimitris A Pados, Kanke Gao, John D MatyjasAbstract:We consider a secondary multi-hop cognitive radio network with decentralized control that operates cognitively to coexist with primary users. We propose a new spread-spectrum management paradigm, in which, unlike mainstream dynamic spectrum access research, digital waveforms are designed to occupy the entire available spectrum, and to adaptively track the interference profile at the receiver to maximize the link capacity while avoiding interference to primary users. In this context, we study the problem of maximizing the network throughput of a multi-hop network through joint routing and spread-spectrum Channelization. We first propose a centralized formulation of the network control problem. We then propose an algorithm that can be seen as a distributed localized approximation of the throughput-maximizing policy. We refer to the proposed jointly-designed routing and code-division Channelization algorithm as ROCH (Routing and cOde-division Channelization). Specifically, power and spreading code are jointly selected to maximize the pre-detection secondary \mathrm{SINR} while providing quality of service guarantees to on-going primary and secondary transmissions, while the routing algorithm dynamically selects relays based on the network traffic dynamics and on the achievable data rates on different secondary links. We study the throughput and delay performance of ROCH through a extensive simulation experiments, which demonstrate the appeal of the proposed framework through significant performance gains compared to baseline solutions.
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cognitive code division Channelization
IEEE Transactions on Wireless Communications, 2011Co-Authors: Kanke Gao, Stella N Batalama, Dimitris A Pados, John D MatyjasAbstract:We consider the problem of simultaneous power and code-channel allocation for a secondary transmitter/receiver pair coexisting with a primary code-division multiple-access (CDMA) system. Our objective is to find the optimum transmitting power and code sequence of the secondary channel that maximize the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear receiver, while at the same time the SINR of all primary channels at the output of their max-SINR receiver is maintained above a certain threshold. This is a non-convex NP-hard optimization problem. We propose a novel feasible suboptimum solution using semidefinite programming. Simulation studies illustrate the theoretical developments.
Jacques Palicot - One of the best experts on this subject based on the ideXlab platform.
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Design Strategy for Clocking and Runtime Parametrization in the Channelization Accelerator of Multistandard Radios
Journal of Signal Processing Systems, 2015Co-Authors: Michael Navin, Christophe Moy, A. P. Vinod, Jacques PalicotAbstract:The Channelization function in the digital front-end is one of the most computationally intensive kernels in the software defined radio baseband. The Channelization tasks of filtering and decimation can be efficiently performed by a multistage decimation filter structure. The individual filter stages within the decimation filter may operate at different clock rates which may be incommensurate. The multiplicity of clock signals required to support multiple standards necessitates that the clock generation circuitry be parameterizable. In addition to the clock rates of the filter stages, some of the filter stages themselves may need to be fully or partially parameterizable. The current work has two major contributions. Firstly we propose an architecture for generating the multiplicity of clock signals required in a each mode of a multistandard Channelization accelerator using a single reference clock. Secondly we propose a mechanism for loading and locally storing the configuration data for the clock generation circuitry as well as the accelerator datapath while switching between standards.
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Design of multistandard Channelization accelerators for software defined radio handsets
IEEE Transactions on Signal Processing, 2011Co-Authors: Navin Michael, Achutavarrier Prasad Vinod, Christophe Moy, Jacques PalicotAbstract:This paper presents a novel multistandard Channelization accelerator design methodology for the digital front-end of a software defined radio (SDR) handset. Dedicated hardware (HW) accelerator cores have a power efficiency which is several orders higher than a software implementation and hence, have been extensively used for accelerating the computationally intensive tasks like Channelization. However, these cores are generally inflexible and optimized for a single standard. The growing need for supporting multiple wireless standards with heterogeneous throughput and mobility requirements in a small form factor mobile handset with a limited silicon area, requires the accelerator cores to be flexible and reusable in addition to being power efficient. The proposed methodology exploits commonalities in the Channelization specifications to hardwire and reuse a significant portion of the accelerator, across multiple standards. The resulting accelerator is area efficient and scalable for supporting an arbitrary number of standards.
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Flexibility and reusability in the digital front-end of cognitive radio terminals
Circuits Systems and Signal Processing, 2011Co-Authors: Navin Michael, Achutavarrier Prasad Vinod, Christophe Moy, Jacques PalicotAbstract:Emerging communication paradigms like the cognitive radio require extremely flexible physical layer functional units that can be parameterized at runtime for supporting multiple modes. Parameterizing the hardware accelerators in the cognitive radio baseband incurs a latency penalty, which is a function of the amount of reconfiguration data required by the accelerators. In an opportunistic spectrum access scenario, the cumulative latency required to reconfigure all the physical layer units when switching to a new channel reduces the useful time available for transmission, leading to a lower system throughput. Against this background, this paper gives an overview of the amount of reconfiguration data required by different candidate accelerator architectures for performing the computationally intensive Channelization function, in the digital front-end of the cognitive radio terminal. The paper also identifies opportunities for reusing hardwired stages of a Channelization accelerator across multiple modes, while minimizing the reconfiguration overhead.[PUBLICATION ABSTRACT]
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Design Paradigm for Standard Agnostic Channelization in Flexible Mobile Radios
2010Co-Authors: Navin Michael, Christophe Moy, A. Prasad Vinod, Jacques PalicotAbstract:The requirement of flexibility and multimode support in emerging communication paradigms has introduced new design challenges for implementing the hardware accelerator cores, which were typically optimized for a single mode of operation. This paper focuses on the computationally intensive Channelization function in a flexible radio. This work introduces a theoretical framework, to systematically identify commonalities and redundancies in the Channelization specification across multiple modes. A novel sample rate conversion ratio factorization strategy is also introduced, that allows a significant portion of the Channelization accelerator to be hardwired and reused across multiple modes of operation.
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A Common Operator Bank to Resolve Scheduling Issue on a Complexity Optimized SDR Terminal
2010Co-Authors: Laurent Alaus, Dominique Noguet, Jacques PalicotAbstract:In the context of Software Defined Radio (SDR), parameterization technique is an interesting approach for the design of multi-standard terminals. It limits the size of the software to a small set of parameters thereby decreasing the radio reconfiguration time. In the proposed research, we refine the Common Operator (CO) technique, which defines a multi standard terminal, based on a limited set of Common Operators. This method enhances the reconfigurability and the scalability of the design but leads to a complex management of data dependencies and scheduling of each operator for its correct execution in the terminal. In this paper, we present a new organization in bank (COB) not only to mitigate the scheduling issue but also to maintain the flexibility and the optimization inhere in the technique. The COB benefits from the property of the CO though limiting the main part of the scheduling. The COB creates a scalable design, limits the scheduling and reduces the number of operators. Applied in the case of LFSR targets to a tri-standard terminal, it lowers the hardware complexity by up to 40%. in emerging communication paradigms has introduced new design challenges for implementing the hardware accelerator cores, which were typically optimized for a single mode of operation. This paper focuses on the computationally intensive Channelization function in a flexible radio. This work introduces a theoretical framework, to systematically identify commonalities and redundancies in the Channelization specification across multiple modes. A novel sample rate conversion ratio factorization strategy is also introduced, that allows a significant portion of the Channelization accelerator to be hardwired and reused across multiple modes of operation.
Dimitris A Pados - One of the best experts on this subject based on the ideXlab platform.
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all spectrum cognitive Channelization around narrowband and wideband primary stations
Global Communications Conference, 2014Co-Authors: George Sklivanitis, Emrecan Demirors, Stella N Batalama, Dimitris A Pados, Adam Gannon, Tommaso MelodiaAbstract:In this paper we design, implement, and experimentally evaluate a wireless software-defined radio platform for cognitive Channelization in the presence of narrowband or wideband primary stations. Cognitive Channelization is achieved by jointly optimizing the transmission power and the waveform channel of the secondary users. The process of joint resource allocation requires no a-priori knowledge of the transmission characteristics of the primary user and maximizes the signal-to- interference-plus-noise ratio (SINR) at the output of the secondary receiver. This is achieved by designing waveforms that span the whole continuum of available/device-accessible spectrum, while satisfying a peak power constraint for the secondary users and an interference temperature (IT) constraint for the primary users. We build a four-node software-defined radio testbed and experimentally demonstrate in an indoor laboratory environment the theoretical concepts of all-spectrum cognitive Channelization in terms of pre-detection SINR and bit- error-rate (BER) at both primary and secondary receivers.
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receiver configuration and testbed development for underwater cognitive Channelization
Asilomar Conference on Signals Systems and Computers, 2014Co-Authors: George Sklivanitis, Emrecan Demirors, Stella N Batalama, Tommaso Melodia, Dimitris A PadosAbstract:We propose a receiver configuration and we develop a software-defined-radio testbed for real-time cognitive underwater multiple-access communications. The proposed receiver is fully reconfigurable and executes (i) all-spectrum cognitive Channelization and (ii) combined synchronization, channel estimation, and demodulation. Online (real-time) experimental field studies using in-house built modems demonstrate our theoretical developments and show that cognitive Channelization is a powerful proposition for underwater communications that leads to significant improvement of spectrum utilization. Even in the absence of interference, due to the noise characteristics of the acoustic channel, cognitive Channelization offers significant performance improvements in terms of receiver pre-detection signal-to-interference-plus-noise-ratio and bit-error-rate.
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all spectrum cognitive networking through joint distributed Channelization and routing
IEEE Transactions on Wireless Communications, 2013Co-Authors: Lei Ding, Stella N Batalama, Tommaso Melodia, Dimitris A Pados, Kanke Gao, John D MatyjasAbstract:We consider a secondary multi-hop cognitive radio network with decentralized control that operates cognitively to coexist with primary users. We propose a new spread-spectrum management paradigm, in which, unlike mainstream dynamic spectrum access research, digital waveforms are designed to occupy the entire available spectrum, and to adaptively track the interference profile at the receiver to maximize the link capacity while avoiding interference to primary users. In this context, we study the problem of maximizing the network throughput of a multi-hop network through joint routing and spread-spectrum Channelization. We first propose a centralized formulation of the network control problem. We then propose an algorithm that can be seen as a distributed localized approximation of the throughput-maximizing policy. We refer to the proposed jointly-designed routing and code-division Channelization algorithm as ROCH (Routing and cOde-division Channelization). Specifically, power and spreading code are jointly selected to maximize the pre-detection secondary \mathrm{SINR} while providing quality of service guarantees to on-going primary and secondary transmissions, while the routing algorithm dynamically selects relays based on the network traffic dynamics and on the achievable data rates on different secondary links. We study the throughput and delay performance of ROCH through a extensive simulation experiments, which demonstrate the appeal of the proposed framework through significant performance gains compared to baseline solutions.
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cognitive code division Channelization
IEEE Transactions on Wireless Communications, 2011Co-Authors: Kanke Gao, Stella N Batalama, Dimitris A Pados, John D MatyjasAbstract:We consider the problem of simultaneous power and code-channel allocation for a secondary transmitter/receiver pair coexisting with a primary code-division multiple-access (CDMA) system. Our objective is to find the optimum transmitting power and code sequence of the secondary channel that maximize the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear receiver, while at the same time the SINR of all primary channels at the output of their max-SINR receiver is maintained above a certain threshold. This is a non-convex NP-hard optimization problem. We propose a novel feasible suboptimum solution using semidefinite programming. Simulation studies illustrate the theoretical developments.
Stella N Batalama - One of the best experts on this subject based on the ideXlab platform.
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all spectrum cognitive Channelization around narrowband and wideband primary stations
Global Communications Conference, 2014Co-Authors: George Sklivanitis, Emrecan Demirors, Stella N Batalama, Dimitris A Pados, Adam Gannon, Tommaso MelodiaAbstract:In this paper we design, implement, and experimentally evaluate a wireless software-defined radio platform for cognitive Channelization in the presence of narrowband or wideband primary stations. Cognitive Channelization is achieved by jointly optimizing the transmission power and the waveform channel of the secondary users. The process of joint resource allocation requires no a-priori knowledge of the transmission characteristics of the primary user and maximizes the signal-to- interference-plus-noise ratio (SINR) at the output of the secondary receiver. This is achieved by designing waveforms that span the whole continuum of available/device-accessible spectrum, while satisfying a peak power constraint for the secondary users and an interference temperature (IT) constraint for the primary users. We build a four-node software-defined radio testbed and experimentally demonstrate in an indoor laboratory environment the theoretical concepts of all-spectrum cognitive Channelization in terms of pre-detection SINR and bit- error-rate (BER) at both primary and secondary receivers.
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receiver configuration and testbed development for underwater cognitive Channelization
Asilomar Conference on Signals Systems and Computers, 2014Co-Authors: George Sklivanitis, Emrecan Demirors, Stella N Batalama, Tommaso Melodia, Dimitris A PadosAbstract:We propose a receiver configuration and we develop a software-defined-radio testbed for real-time cognitive underwater multiple-access communications. The proposed receiver is fully reconfigurable and executes (i) all-spectrum cognitive Channelization and (ii) combined synchronization, channel estimation, and demodulation. Online (real-time) experimental field studies using in-house built modems demonstrate our theoretical developments and show that cognitive Channelization is a powerful proposition for underwater communications that leads to significant improvement of spectrum utilization. Even in the absence of interference, due to the noise characteristics of the acoustic channel, cognitive Channelization offers significant performance improvements in terms of receiver pre-detection signal-to-interference-plus-noise-ratio and bit-error-rate.
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all spectrum cognitive networking through joint distributed Channelization and routing
IEEE Transactions on Wireless Communications, 2013Co-Authors: Lei Ding, Stella N Batalama, Tommaso Melodia, Dimitris A Pados, Kanke Gao, John D MatyjasAbstract:We consider a secondary multi-hop cognitive radio network with decentralized control that operates cognitively to coexist with primary users. We propose a new spread-spectrum management paradigm, in which, unlike mainstream dynamic spectrum access research, digital waveforms are designed to occupy the entire available spectrum, and to adaptively track the interference profile at the receiver to maximize the link capacity while avoiding interference to primary users. In this context, we study the problem of maximizing the network throughput of a multi-hop network through joint routing and spread-spectrum Channelization. We first propose a centralized formulation of the network control problem. We then propose an algorithm that can be seen as a distributed localized approximation of the throughput-maximizing policy. We refer to the proposed jointly-designed routing and code-division Channelization algorithm as ROCH (Routing and cOde-division Channelization). Specifically, power and spreading code are jointly selected to maximize the pre-detection secondary \mathrm{SINR} while providing quality of service guarantees to on-going primary and secondary transmissions, while the routing algorithm dynamically selects relays based on the network traffic dynamics and on the achievable data rates on different secondary links. We study the throughput and delay performance of ROCH through a extensive simulation experiments, which demonstrate the appeal of the proposed framework through significant performance gains compared to baseline solutions.
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cognitive code division Channelization
IEEE Transactions on Wireless Communications, 2011Co-Authors: Kanke Gao, Stella N Batalama, Dimitris A Pados, John D MatyjasAbstract:We consider the problem of simultaneous power and code-channel allocation for a secondary transmitter/receiver pair coexisting with a primary code-division multiple-access (CDMA) system. Our objective is to find the optimum transmitting power and code sequence of the secondary channel that maximize the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear receiver, while at the same time the SINR of all primary channels at the output of their max-SINR receiver is maintained above a certain threshold. This is a non-convex NP-hard optimization problem. We propose a novel feasible suboptimum solution using semidefinite programming. Simulation studies illustrate the theoretical developments.
Tommaso Melodia - One of the best experts on this subject based on the ideXlab platform.
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all spectrum cognitive Channelization around narrowband and wideband primary stations
Global Communications Conference, 2014Co-Authors: George Sklivanitis, Emrecan Demirors, Stella N Batalama, Dimitris A Pados, Adam Gannon, Tommaso MelodiaAbstract:In this paper we design, implement, and experimentally evaluate a wireless software-defined radio platform for cognitive Channelization in the presence of narrowband or wideband primary stations. Cognitive Channelization is achieved by jointly optimizing the transmission power and the waveform channel of the secondary users. The process of joint resource allocation requires no a-priori knowledge of the transmission characteristics of the primary user and maximizes the signal-to- interference-plus-noise ratio (SINR) at the output of the secondary receiver. This is achieved by designing waveforms that span the whole continuum of available/device-accessible spectrum, while satisfying a peak power constraint for the secondary users and an interference temperature (IT) constraint for the primary users. We build a four-node software-defined radio testbed and experimentally demonstrate in an indoor laboratory environment the theoretical concepts of all-spectrum cognitive Channelization in terms of pre-detection SINR and bit- error-rate (BER) at both primary and secondary receivers.
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receiver configuration and testbed development for underwater cognitive Channelization
Asilomar Conference on Signals Systems and Computers, 2014Co-Authors: George Sklivanitis, Emrecan Demirors, Stella N Batalama, Tommaso Melodia, Dimitris A PadosAbstract:We propose a receiver configuration and we develop a software-defined-radio testbed for real-time cognitive underwater multiple-access communications. The proposed receiver is fully reconfigurable and executes (i) all-spectrum cognitive Channelization and (ii) combined synchronization, channel estimation, and demodulation. Online (real-time) experimental field studies using in-house built modems demonstrate our theoretical developments and show that cognitive Channelization is a powerful proposition for underwater communications that leads to significant improvement of spectrum utilization. Even in the absence of interference, due to the noise characteristics of the acoustic channel, cognitive Channelization offers significant performance improvements in terms of receiver pre-detection signal-to-interference-plus-noise-ratio and bit-error-rate.
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all spectrum cognitive networking through joint distributed Channelization and routing
IEEE Transactions on Wireless Communications, 2013Co-Authors: Lei Ding, Stella N Batalama, Tommaso Melodia, Dimitris A Pados, Kanke Gao, John D MatyjasAbstract:We consider a secondary multi-hop cognitive radio network with decentralized control that operates cognitively to coexist with primary users. We propose a new spread-spectrum management paradigm, in which, unlike mainstream dynamic spectrum access research, digital waveforms are designed to occupy the entire available spectrum, and to adaptively track the interference profile at the receiver to maximize the link capacity while avoiding interference to primary users. In this context, we study the problem of maximizing the network throughput of a multi-hop network through joint routing and spread-spectrum Channelization. We first propose a centralized formulation of the network control problem. We then propose an algorithm that can be seen as a distributed localized approximation of the throughput-maximizing policy. We refer to the proposed jointly-designed routing and code-division Channelization algorithm as ROCH (Routing and cOde-division Channelization). Specifically, power and spreading code are jointly selected to maximize the pre-detection secondary \mathrm{SINR} while providing quality of service guarantees to on-going primary and secondary transmissions, while the routing algorithm dynamically selects relays based on the network traffic dynamics and on the achievable data rates on different secondary links. We study the throughput and delay performance of ROCH through a extensive simulation experiments, which demonstrate the appeal of the proposed framework through significant performance gains compared to baseline solutions.