Now showing items 247-266 of 1822

    • Code design for multiple-antenna systems 

      Memarzadeh, Mahsa (2001)
      We propose a systematic method for the design of space-time codes for AWGN slowly and fast Rayleigh fading channels. This can be accomplished by adopting a concatenated space-time code structure, where an orthogonal transmit ...
    • Code design for the relay channel 

      Chakrabarti, Arnab (2007)
      The design of wireless communication networks is based on the premise that networks are collections of reliable point-to-point links between communicating nodes. Such a communication model, although simple, is inefficient ...
    • Code Transformations to Improve Memory Parallelism 

      Pai, Vijay S.; Adve, Sarita V. (2000-05-20)
      Current microprocessors incorporate techniques to exploit instruction-level parallelism (ILP). However, previous work has shown that these ILP techniques are less effective in removing memory stall time than CPU time, ...
    • Code Transformations to Improve Memory Parallelism 

      Pai, Vijay S.; Adve, Sarita V. (1999-11-20)
      None
    • Coding for Phase Change Memory Performance Optimization 

      Mirhoseini, Azalia (2012-09-05)
      Over the past several decades, memory technologies have exploited continual scaling of CMOS to drastically improve performance and cost. Unfortunately, charge-based memories become unreliable beyond 20 nm feature sizes. ...
    • Coding Theoretic Approach to Image Segmentation 

      Ndili, Unoma (2001-05-20)
      Using a coding theoretic approach, we achieve unsupervised image segmentation by implementing Rissanen's concept of Minimum Description Length for estimating piecewise homogeneous regions in images. MDL offers a mathematical ...
    • Coding Theoretic Approach to Image Segmentation 

      Ndili, Unoma; Nowak, Robert David; Figueiredo, Mario (2001-10-20)
      In this paper, using a coding theoretic approach, we implement Rissanen's concept of minimum description length (MDL) for segmenting an image into piecewise homogeneous regions. Our image model is a Gaussian random field ...
    • Coding-spreading tradeoff for lattice codes 

      Khoshnevis, Ahmad (2001)
      A fixed bandwidth expansion can be achieved either by coding or spreading, while each have different effect on the resultant signal space. Coding increases both Shannon and Fourier bandwidth whereas spreading only increases ...
    • Coding-Spreading Tradeoff for Lattice Codes 

      Khoshnevis, Ahmad (2001-04-20)
      A fixed bandwidth expansion can be achieved either by coding or spreading, while each have different effect on the resultant signal space. Coding increases both Shannon and Fourier bandwidth whereas spreading only increases ...
    • Coherent Fano resonances in a plasmonic nanocluster enhance optical four-wave mixing 

      Zhang, Yu; Wen, Fangfang; Zhen, Yu-Rong; Nordlander, Peter; Halas, Naomi J. (2013)
      Plasmonic nanoclusters, an ordered assembly of coupled metallic nanoparticles, support unique spectral features known as Fano resonances due to the coupling between their subradiant and superradiant plasmon modes. Within ...
    • Coherent Image Processing using Quaternion Wavelets 

      Chan, Wai Lam; Choi, Hyeokho; Baraniuk, Richard G. (2005-08-01)
      We develop a quaternion wavelet transform (QWT) as a new multiscale analysis tool for geometric image features. The QWT is a near shift-invariant, tight frame representation whose coefficients sport a magnitude and three ...
    • Coherent Multiscale Image Processing using Quaternion Wavelets 

      Chan, Wai Lam; Choi, Hyeokho; Baraniuk, Richard G. (2006-10-01)
      The quaternion wavelet transform (QWT) is a new multiscale analysis tool for geometric image features. The QWT is a near shift-invariant tight frame representation whose coefficients sport a magnitude and three phases: ...
    • Coherent multiscale image processing using quaternion wavelets 

      Chan, Wai Lam (2006)
      This thesis develops a quaternion wavelet transform (QWT) as a new multiscale analysis tool for geometric image features. The QWT is a near shift-invariant tight frame representation whose coefficients sport a magnitude ...
    • Collective antenna effects in the terahertz and infrared response of highly aligned carbon nanotube arrays 

      Ren, L.; Zhang, Q.; Pint, C.L.; Wójcik, A.K.; Bunney, M. Jr; Arikawa, T.; Kawayama, I.; Tonouchi, M.; Hauge, R.H.; Belyanin, A.A.; Kono, J. (2013)
      We study macroscopically aligned single-wall carbon nanotube arrays with uniform lengths via polarization-dependent terahertz and infrared transmission spectroscopy. Polarization anisotropy is extreme at frequencies less ...
    • Communication Processors 

      Rajagopal, Sridhar; Cavallaro, Joseph R. (2005-07-01)
      Communication processors are processors with specific optimizations to support communication sys-tems. Communication processors exist in a wide variety of forms and can be categorized based on the communication system, ...
    • Community Driven Digital Signal Processing Laboratories in Connexions 

      Baraniuk, Richard G.; Choi, Hyeokho; Jones, Douglas L.; Potter, Lee (2004-06-01)
      The conventional textbook is largely inadequate for digital signal processing (DSP) laboratory education due to inherent factors such as a small and fragmented market and rapid hardware obsolescence. Freely available ...
    • Compact all-fiber quartz-enhanced photoacoustic spectroscopy sensor with a 30.72 kHz quartz tuning fork and spatially resolved trace gas detection 

      Ma, Yufei; He, Ying; Yu, Xin; Zhang, Jingbo; Sun, Rui; Tittel, Frank K. (2016)
      An ultra compact all-fiber quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor using quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was demonstrated. Such a sensor architecture has the advantages ...
    • Compact CH4 sensor system based on a continuous-wave, low power consumption, room temperature interband cascade laser 

      Dong, Lei; Li, Chunguang; Sanchez, Nancy P.; Gluszek, Aleksander K.; Griffin, Robert J.; Tittel, Frank K. (2016)
      A tunable diode laser absorption spectroscopy-based methane sensor, employing a dense-pattern multi-pass gas cell and a 3.3 μm, CW, DFB, room temperature interband cascade laser (ICL), is reported. The optical integration ...
    • Compact Hardware Accelerator for Functional Verification and Rapid Prototyping of 4G Wireless Communication Systems 

      Guo, Yuanbin; McCain, Dennis (2004-11-01)
      In this paper, we propose an FPGA-based hardware accelerator platform with Xilinx Virtex-II V3000 in a compact PCMCIA form factor. By partitioning the complex algorithms in the 4G simulator to the hardware accelerator, ...
    • A compact mid-infrared dual-gas CH4/C2H6 sensor using a single interband cascade laser and custom electronics 

      Ye, Weilin; Zheng, Chuantao; Tittel, Frank K.; Sanchez, Nancy P.; Gluszek, Aleksander K.; Hudzikowski, Arkadiusz J.; Lou, Minhan; Dong, Lei; Griffin, Robert J. (2017)
      A compact mid-infrared (MIR) dual-gas sensor system was demonstrated for simultaneous detection of methane (CH4) and ethane (C2H6) using a single continuous-wave (CW) interband cascade laser (ICL) based on tunable laser ...