Now showing items 1-16 of 16

  • Channel Estimation for Multirate DS-CDMA Systems 

    Sabharwal, Ashutosh; Mitra, Urbashi; Bhashyam, Srikrishna (2000-11-20)
    The problem of channel estimation for multiple data rate Direct-Sequence Code-Division Multiple-Acess (DS-CDMA) systems is addressed. The derived algorithms are suitable for both variable chipping rate and/or variable ...
  • Edge Localized Image Sharpening via Reassignment with Application to Computed Tomography 

    Dorney, Timothy D.; Bhashyam, Srikrishna; Doran, Andrew; Choi, Hyeokho; Flandrin, Patrick; Baraniuk, Richard G. (2000-07-01)
    Traditional filtering methods operate on the entire signal or image. In some applications, however, errors are concentrated in specific regions or features. A prime example is images generated using computed tomography. ...
  • Efficient VLSI Architectures for Baseband Signal Processing for Wireless Base-Station Receivers 

    Rajagopal, Sridhar; Bhashyam, Srikrishna; Cavallaro, Joseph R.; Aazhang, Behnaam (2000-07-20)
    A real-time VLSI architecture is designed for multiuser channel estimation, one of the core base-band processing operations in wireless base-station receivers. Future wireless basestation receivers will need to use ...
  • Efficient VLSI architectures for multiuser channel estimation in wireless base-station receivers 

    Rajagopal, Sridhar; Bhashyam, Srikrishna; Cavallaro, Joseph R.; Aazhang, Behnaam (Kluwer Academic Pubishers, 2002-06-20)
    This paper presents a reduced-complexity, fixed-point algorithm and efficient real-time VLSI architectures for multiuser channel estimation, one of the core baseband processing operations in wireless base-station receivers ...
  • Feedback gain in Multiple Antenna Systems 

    Bhashyam, Srikrishna; Sabharwal, Ashutosh; Aazhang, Behnaam (2002-05-20)
    Multiple antenna transmission and reception have been shown to significantly increase the achievable data rates of wireless systems. However, most of the existing analysis assumes perfect or no channel information at the ...
  • Multiuser Channel Estimation and Tracking for Long Code CDMA Systems 

    Bhashyam, Srikrishna; Aazhang, Behnaam (2002-01-15)
    Channel estimation techniques for code-division multiple access (CDMA) systems need to combat multiple access interference (MAI) effectively. Most existing estimation techniques are designed for CDMA systems with short ...
  • Multiuser Channel Estimation for Long Code CDMA Systems 

    Bhashyam, Srikrishna; Aazhang, Behnaam (2000-09-20)
    Channel estimation techniques for code-division multiple access (CDMA) systems need to combat multiple access interference (MAI) effectively. Most existing estimation techniques are designed for CDMA systems with short ...
  • Partially Blind Multiuser Detection 

    Das, Suman; Bhashyam, Srikrishna; Cavallaro, Joseph R.; Aazhang, Behnaam (1999-03-20)
    Multiple access interference (MAI) is a significant limiting factor in the performance of direct sequence code division multiple access (DS-CDMA) systems. Various multiuser detection techniques have been developed to combat ...
  • Partially Blind Multiuser Receivers for CDMA Systems 

    Das, Suman; Bhashyam, Srikrishna; Cavallaro, Joseph R.; Aazhang, Behnaam (1999-12-20)
    Multiple access interference (MAI) significantly limits the performance of code-division multiple access (CDMA) systems. Existing multiuser receivers combat MAI using the knowledge of either all (conventional) or none ...
  • Performance of Iterative Multiuser Decoding and Channel Estimation in WCDMA Systems 

    Bhashyam, Srikrishna; Hottinen, Ari (2000-05-20)
    This paper studies the performance of iterative multiuser decoding, interference cancellation, and channel estimation techniques applicable to third generation WCDMA systems. The concept uses <i>a posteriori</i> probabilities ...
  • Real-Time Algorithms and Architectures for Multiuser Channel Estimation and Detection in Wireless Base-Station Receivers 

    Rajagopal, Sridhar; Bhashyam, Srikrishna; Cavallaro, Joseph R.; Aazhang, Behnaam (IEEE, 2002-07-20)
    This paper presents alogrithms and architecture designs that can meet real-time requirements of multiuser channel estimation and detection in future wireless base-station receivers. Sophisticated algorithms proposed to ...
  • Signal and Information Processing for Wireless Communication Systems 

    Bhashyam, Srikrishna (2001-04-20)
    Next generation wireless communication systems need to support access to multimedia data available on the internet. This universal wireless access to multimedia data requires data rates and quality of service that are ...
  • Signal and information processing for wireless communication systems 

    Bhashyam, Srikrishna (2001)
    Next generation wireless communication systems need to support access to multimedia data available on the internet. This universal wireless access to multimedia data requires data rates and quality of service that are ...
  • Time-Selective Signaling and Reception for Communication over Multipath Fading Channels 

    Bhashyam, Srikrishna; Sayeed, Akbar M.; Aazhang, Behnaam (2000-01-20)
    The mobile wireless channel affords inherent diversity to combat the effects of fading. Existing code division multiple access (CDMA) systems, by virtue of spread-spectrum signaling and RAKE reception, exploit only part ...
  • Time-Selective Signaling and Reception for Communication over Multipath Fading Channels 

    Bhashyam, Srikrishna (1998-04-20)
    The mobile wireless channel offers inherent diversity by virtue of multipath and Doppler shifts. Multipath diversity is exploited via spread-spectrum signaling employed in code division multiple access (CDMA) systems. ...
  • Time-selective signaling and reception for communication over multipath fading channels 

    Bhashyam, Srikrishna (1998)
    The mobile wireless channel offers inherent diversity by virtue of multipath and Doppler shifts. Multipath diversity is exploited via spread-spectrum signaling employed in code division multiple access (CDMA) systems. ...