Prompt Inc

Montréal, Canada

Prompt Inc

Montréal, Canada
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Despins C.,Prompt Inc. | Labeau F.,McGill University | Le Ngoc T.,SRTelecom Inc. | Labelle R.,McGill University | And 9 more authors.
IEEE Communications Magazine | Year: 2011

Green communication systems and, in broader terms, green information and communications technologies have the potential to significantly reduce greenhouse gas emissions worldwide. This article provides an overview of two issues related to achieving the full carbon abatement potential of ICT. First, green communications research challenges are discussed, notably as they pertain to networking issues. Various initiatives regarding green ICT testbeds are presented in the same realm in order to validate the ¿green performance¿ and functionality of such greener cyber-infrastructure. Second, this article offers a description of ongoing international efforts to standardize methodologies that accurately quantify the carbon abatement potential of ICTs, an essential tool to ensure the economic viability of green ICT in the low carbon economy and carbon credit marketplace of the 21st century. © 2011 IEEE.


Salih-Alj Y.,Al Akhawayn University | Despins C.,Prompt Inc. | Affes S.,INRS EMT
IEEE Transactions on Wireless Communications | Year: 2011

This paper presents an Ultra-Wideband (UWB) computationally-efficient fast acquisition system suggested for ranging in indoor, Line-Of-Sight (LOS) environments. The performance of the proposed scheme is evaluated and its implementation issues are discussed. The design complexity leverages field-programmable gate arrays (FPGA) to implement the parallel processing concept. Timing acquisition at high sampling rates of the ultra-short pulses used in UWB communications can be costly and slow for ranging. This is due to the large number of required operations in an intensive software-based signal processing. The proposed UWB scheme in this paper uses an efficient block-processing technique that simplifies hardware implementation with a greatly reduced number of operations and acquisition time, while also offering accurate ranging capabilities over the considered indoor channel at high levels of multiple-user interference (MUI) and Gaussian noise. © 2006 IEEE.


Jha S.C.,University of British Columbia | Rashid M.M.,University of British Columbia | Bhargava V.K.,University of British Columbia | Despins C.,Prompt Inc.
IEEE Wireless Communications | Year: 2011

Since cognitive radio technology can significantly boost spectrum utilization by exploiting radio spectrum unused by licensed users, it is rapidly gaining popularity and inspiring numerous applications. However, many technical issues still need to be addressed for successful deployment of CR networks, especially in the MAC layer. We focus on CR networks that have distributed architecture because they offer ease of deployment, self-organizing capability, and flexibility in design, and are believed to be more practical for future deployments compared to their centralized counterparts. The MAC protocols for distributed CR networks should consider the key features of these networks such as lack of a central unit to coordinate the communication, dynamic topology, requirements to keep interference to primary users minimal, and variation of spectrum availability with time and location. To clarify the relevant research challenges and issues, we provide a detailed study of the critical design issues and an overview of current state-of-the-art MAC protocols proposed for DCRNs. A classification of existing proposals is provided, and their salient features, advantages, and limitations are discussed. We then introduce and study a novel MAC protocol that addresses some of the research issues better than existing solutions. We also highlight important research challenges that could drive future research in this area. © 2011 IEEE.


Punchihewa A.,University of British Columbia | Bhargava V.K.,University of British Columbia | Despins C.,Prompt Inc.
IEEE Transactions on Wireless Communications | Year: 2011

This paper presents a blind parameter estimation algorithm for orthogonal frequency division multiplexing (OFDM) signal affected by a time-dispersive channel, timing offset, carrier frequency offset and additive Gaussian noise. Unlike the previous studies, this paper presents the second-order cyclostationarity of OFDM signal considering the effect of time-dispersive channel. The cyclostationarity properties of received OFDM signal in time-dispersive channel is exploited to estimate the OFDM parameters. These parameters includes OFDM symbol period, useful symbol period, cyclic prefix factor, number of subcarriers and carrier frequency offset. Simulations are performed to investigate the performance of OFDM parameter estimation algorithm in diverse channel conditions. © 2011 IEEE.


Punchihewa A.,University of British Columbia | Bhargava V.K.,University of British Columbia | Despins C.,Prompt Inc.
IEEE Transactions on Wireless Communications | Year: 2011

This paper presents a lower-bound on the ergodic sum capacity of single-input single-output (SISO) opportunistic spectrum sharing multiple access channel (MAC) in Rayleigh fading channels with imperfect channel estimates. Unlike the previous studies, this paper considerers the channel estimation errors for both sets of SISO channels between the secondary user (SU) transmitters and the SU receiver and between the SU transmitters and the primary user receivers. By considering these channel estimation errors, an optimal power allocation policy for each SU transmitter is derived to achieve a lower-bound of the ergodic sum capacity of opportunistic spectrum sharing MAC, subject to a set of SUs transmit power constraints and a set of interference power constraints at each PU receiver. Furthermore, convex optimization techniques are exploited to derive an efficient algorithm to obtain the optimal power allocation for each SU transmitter. Numerical results are presented to illustrate the influences of the channel estimation errors on the ergodic sum capacity. © 2011 IEEE.


Rahman M.M.,University of Québec | Despins C.,University of Québec | Despins C.,Prompt Inc. | Affes S.,University of Quebec at Montréal
IEEE Transactions on Wireless Communications | Year: 2016

Wireless access virtualization is an emerging avenue for research for future 5G networks. For its ability to augment network sharing and its subsequent impact on reducing network setup and operational costs, network virtualization is greatly sought after by telecommunications operators all over the world. This paper classifies virtual wireless access into three possible PHY-MAC models that differ in terms of the degree of segregation of baseband signal processing and radio access units. One of the models uses special purpose hardware while another leverages software defined networking (SDN) and cloud computing technologies for implementing virtual wireless access using general purpose hardware. The proposed models differ in terms of their associated network operational cost as well as in terms of the level of QoS they can provide. A new multi-criteria utility function is hence proposed in order to assess the tradeoffs between network cost & QoS of these models from a PHY-MAC layer perspective. The new utility function provides guidelines for a network designer to choose the optimal virtualization model that best fits an operator's budget constraint as well as the QoS requirement of the intended service. Analytical results show that a novel hybrid model that properly combines both special purpose and SDN & cloud computing technologies maximizes the newly introduced utility function by attaining the best balance between overall network cost and QoS. This occurs in most expected practical cases where precisely, one of the two does not relatively outweigh the other and viceversa. © 2002-2012 IEEE.


The present disclosure relates to a method for intuitively reproducing video contents through data structuring and the apparatus thereof, more specifically, which searches section by section the video contents edited and provided based on section with free search, hash tag, and/or bookmark, produces a new video contents from the searched sections of the video contents, and therefore promotes consumption of the video contents by providing reproduced video contents. The video contents can be edited and played by using a user interface intuitively figuring out the structure of video contents.


The present invention relates to an apparatus of providing a user interface for playing and editing moving pictures (i.e., video) and the method thereof, the user interface being capable of maximizing learning and practice effects by providing an interface which allows inserting of cue-points in the video on the basis of beats in music or periodic signals equivalent thereto and visibly displaying cue-points, recording of ones practice clips while playing the video so as to allow video playback and practice at the same time, and the instantaneous comparison/analysis of the recorded practice clips and reference video.


Trademark
Prompt Incorporated | Date: 2016-01-19

Computer software for the collection, editing, organizing, modifying, book marking, transmission, storage and sharing of data and information.


Trademark
Prompt Incorporated | Date: 2012-08-22

Computer software for the collection, editing, organizing, modifying, book marking, transmission, storage and sharing of data and information.

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