Now showing items 443-462 of 1250

    • Half-Duplex Estimate-and-Forward Relaying: Bounds and Code Design 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-07-01)
      We propose a coding scheme for half-duplex estimate-and-forward relaying. Our first contribution is to present an achievable rate for the estimate-and-forward protocol. We also derive the achievable rate for the special ...
    • Half-Duplex Estimate-and-Forward Relaying:Bounds and Code Design 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-01-01)
      We propose a coding scheme for half-duplex estimate-and-forward relaying. Our first contribution is to present an achievable rate for the estimate-and-forward protocol. We also derive the achievable rate for the special ...
    • Handset Algorithms & Architectures for Blind Channel Estimation & Detection 

      Livingston, Frank (2000-05-20)
      Multiple access is an important consideration in the design and implementation of wireless communications systems. Code division multiple access (CDMA) is one method for providing multiple access in a wireless system. In ...
    • Handset Detector Architectures for DS-CDMA Wireless Systems 

      Livingston, Frank; Chandrasekhar, Vikram; Vaya, Mani; Cavallaro, Joseph R. (2002-05-20)
      This paper investigates detector architectures for wireless handsets employing DS-CDMA. The code-matched filter (MF) and minimum output energy (MOE) detectors are analyzed with respect to fixed-point arithmetic behavior. ...
    • Hardware design issues for a mobile unit for next generation CDMA systems 

      Das, Suman; Sengupta, Chaitali; Cavallaro, Joseph R. (1998-07-20)
      This paper addresses hardware design issues of a mobile receiver for future generation direct sequence CDMA wireless communication systems. In the design of a mobile unit, fixed-point hardware is an attractive alternative ...
    • A Hardware Testbed for the Implementation and Evaluation of MIMO Algorithms 

      Murphy, Patrick; Lou, Feifei; Frantz, Patrick (2003-10-20)
      As the demand for higher performance wireless communications continues to grow, novel algorithms have been developed which provide increased performance and efficiency. One such class of algorithms involves the use of ...
    • Hardware/Software Co-design Methodology and DSP/FPGA Partitioning: A Case Study for Meeting Real-Time Processing Deadlines in 3.5G Mobile Receivers 

      Brogioli, Michael; Radosavljevic, Predrag; Cavallaro, Joseph R. (2006-08-01)
      This paper presents a DSP/FPGA hardware/software partitioning methodology for signal processing workloads. The example workload is the channel equalization and user-detection in HSDPA wireless standard for 3.5G mobile ...
    • Hermitian Optimization and Scalable VLSI Architecture for Circulant Approximated MIMO Equalizer in CDMA Downlink 

      Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R. (2005-09-01)
      In this paper, we propose a parallel and pipelined VLSI architecture for a circulant approximated equalizer for the MIMOCDMA systems. The FFT-based tap solver reduces the Direct-Matrix-Inverse of the size (NF x NF) to the ...
    • Hidden Markov Models for Wavelet-based Signal Processing 

      Crouse, Matthew; Baraniuk, Richard G.; Nowak, Robert David (1996-11-01)
      Current wavelet-based statistical signal and image processing techniques such as shrinkage and filtering treat the wavelet coefficients as though they were statistically independent. This assumption is unrealistic; considering ...
    • Hidden Markov Tree Modeling of Complex Wavelet Transforms 

      Choi, Hyeokho; Romberg, Justin; Baraniuk, Richard G.; Kingsbury, Nicholas G. (2000-06-01)
      Multiresolution signal and image models such as the hidden Markov tree aim to capture the statistical structure of smooth and singular (edgy) regions. Unfortunately, models based on the orthogonal wavelet transform suffer ...
    • Hidden Markov Tree Models for Complex Wavelet Transforms 

      Romberg, Justin; Choi, Hyeokho; Baraniuk, Richard G.; Kingsbury, Nicholas G. (2002-05-01)
      Multiresolution models such as the hidden Markov tree (HMT) aim to capture the statistical structure of signals and images by leveraging two key wavelet transform properties: wavelet coefficients representing smooth/singular ...
    • A Hierarchical and Multiscale Analysis of E-Business Workloads 

      Menascé, Daniel; Almeida, Virgilio; Riedi, Rudolf H. (2002-01-15)
      Understanding the nature and characteristics of E-business workloads is a crucial step to improve the quality of service offered to customers in electronic business environments. Using a multi-layer hierarchical model, ...
    • A Hierarchical Wavelet-Based Framework for Pattern Analysis and Synthesis 

      Scott, Clayton (2000-04-20)
      Despite their success in other areas of statsitical signal processing, current wavelet-based image models are inadequate for modeling patterns in images, due to the presence of unknown transformations inherent in most ...
    • Hierarchical Wavelet-Based Image Model for Pattern Analysis and Synthesis 

      Scott, Clayton; Nowak, Robert David (2000-07-20)
      Despite their success in other areas of statistical signal processing, current wavelet-based image models are inadequate for modeling patterns in images, due to the presence of unknown transformations (e.g., translation, ...
    • High Chromaticity Aluminum Plasmonic Pixels for Active Liquid Crystal Displays 

      Olson, Jana; Manjavacas, Alejandro; Basu, Tiyash; Huang, Da; Schlather, Andrea E.; Zheng, Bob; Halas, Naomi; Nordlander, Peter; Link, Stephan (2016)
      Chromatic devices such as flat panel displays could, in principle, be substantially improved by incorporating aluminum plasmonic nanostructures instead of conventional chromophores that are susceptible to photobleaching. ...
    • High efficiency carbon nanotube thread antennas 

      Bengio, E. Amram; Senic, Damir; Taylor, Lauren W.; Tsentalovich, Dmitri E.; Chen, Peiyu; Holloway, Christopher L.; Babakhani, Aydin; Long, Christian J.; Novotny, David R.; Booth, James C.; Orloff, Nathan D.; Pasquali, Matteo (2017)
      Although previous research has explored the underlying theory of high-frequency behavior of carbon nanotubes (CNTs) and CNT bundles for antennas, there is a gap in the literature for direct experimental measurements of ...
    • High ionic strength narrows the population of sites participating in protein ion-exchange adsorption: A single-molecule study 

      Kisley, Lydia; Chen, Jixin; Mansur, Andrea P.; Dominguez-Medina, Sergio; Kulla, Eliona; Kang, Marci; Shuang, Bo; Kourentzi, Katerina; Poongavanam, Mohan-Vivekanandan; Dhamane, Sagar; Willson, Richard C.; Landes, Christy F. (2014)
      The retention and elution of proteins in ion-exchange chromatography is routinely controlled by adjusting the mobile phase salt concentration. It has repeatedly been observed, as judged from adsorption isotherms, that the ...
    • A High Throughput Configurable SDR Detector for Multi-user MIMO Wireless Systems 

      Amiri, Kiarash; Cavallaro, Joseph R.; Dick, Chris; Rao, Raghu Mysore (2011-02-01)
      Spatial division multiplexing (SDM) in MIMO technology significantly increases the spectral efficiency, and hence capacity, of a wireless communication system: it is a core component of the next generation wireless systems, ...
    • A High Throughput Configurable SDR Detector for Multi-user MIMO Wireless Systems 

      Amiri, Kiarash; Cavallaro, Joseph R.; Dick, Chris; Rao, Raghu Mysore (2009-04-08)
      Spatial division multiplexing (SDM) in MIMO technology significantly increases the spectral efficiency, and hence capacity, of a wireless communication system: it is a core component of the next generation wireless ...
    • High Throughput VLSI Architecture for Soft-Output MIMO Detection Based on A Greedy Graph Algorithm 

      Sun, Yang; Cavallaro, Joseph R. (2009-05-10)
      Maximum-likelihood (ML) decoding is a very computational- intensive task for multiple-input multiple-output (MIMO) wireless channel detection. This paper presents a new graph based algorithm to achieve near ML performance ...