Now showing items 1-16 of 16

  • Delay and Rate Constrained Transmission Policies over Wireless Channels 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2001-11-20)
    In this paper, we study delay and rate-constrained transmission of bursty traffic over wireless channels. We characterize the minimum power requirements via bounds for both single user and multiuser downlink problems, using ...
  • Delay bounded packet scheduling of bursty traffic over wireless channels 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-01-01)
    In this paper, we study minimal power transmission of bursty sources over wireless channels with constraints on mean queuing delay. The power minimizing schedulers adapt power and rate of transmission based on the queue ...
  • Dual Problems in Power Control 

    Sabharwal, Ashutosh; Rajan, Dinesh; Aazhang, Behnaam (2001-10-20)
    In this paper, we study power control to minimize packet loss for delay-bounded transmission of bursty sources over Gaussian channels and transmission of constant rate sources over time-varying block fading channels. In ...
  • Impact of Multiple Access on Uplink scheduling 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2001-09-20)
    In this paper, we consider uplink scheduling for bursty traffic. We characterize the achievable rate region for Gaussian multiple access in terms of minimum required powers, with a constraint on average transmission delay ...
  • New Estimation Techniques for a class of chaotic signals 

    Rajan, Dinesh; Aazhang, Behnaam (2000-06-20)
    We propose a new technique for estimation of chaotic signals in the presence of additive noise. The new method uses statistical measures to restrict the space over which the signals are received. The proposed technique ...
  • New Spread Spectrum Techniques for Multiple Antenna Transmit Diversity 

    Rajan, Dinesh; Erkip, Elza; Aazhang, Behnaam (1999-12-20)
    We propose a new scheme for multiple antenna transmission in the context of spread spectrum signaling. The new scheme consists of using shifted Gold sequences to modulate independent information on the multiple atennas. ...
  • Outage behaviour with delay and CSIT 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-06-01)
    In this paper, we demonstrate that the packet outage probability for fading channels can be significantly reduced by exploiting queuing delay and transmitter channel information. Queuing delay gain is conceptually similar ...
  • Power efficient broadcast scheduling with delay deadlines 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-10-01)
    In this paper, we present a framework for the design of minimal power schedulers that satisfy average packet delay bounds for multiple users in a Gaussian wireless broadcast channel. We completely characterize the achievable ...
  • Power efficient transmission policies for multimedia traffic over wireless channels 

    Rajan, Dinesh (2002-04-20)
    The current and future wireless systems need to support a multitude of services with a wide range of data rates and reliability requirements. The limited battery resource at a mobile terminal coupled with the hostile ...
  • Power efficient transmission policies for multimedia traffic over wireless channels 

    Rajan, Dinesh (2002)
    The current and future wireless systems need to support a multitude of services with a wide range of data rates and reliability requirements. The limited battery resource at a mobile terminal coupled with the hostile ...
  • Soft weighted STTD for W-CDMA 

    Hottinen, Ari; Wichman, Risto; Rajan, Dinesh (1999-09-20)
    The transmit diversity concept adopted for teh FDD mode of the third generation WCDMA system in 3G standardization has an open-loop and a closed-loop mode. The open-loop mode applies a space-time block for two transmit ...
  • Spreading and Power Allocation for Multiple Antenna Transmission using Decorrelating receivers 

    Rajan, Dinesh; Erkip, Elza; Aazhang, Behnaam (2003-05-20)
    We propose a new scheme for multiple antenna transmission in the context of spread spectrum signaling. The new scheme consists of using shifted Gold sequences to modulate independent information on the multiple antennas. ...
  • Spreading and Power Control for Multiple Antenna Transmit Diversity 

    Rajan, Dinesh (1999-04-20)
    This thesis proposes a new transmission scheme for multiple antenna transmission at the base station of a wireless cellular system. We develop our new scheme in a wideband CDMA framework using multiple phases of Gold codes ...
  • Spreading and power control for multiple antenna transmit diversity 

    Rajan, Dinesh (1999)
    This thesis proposes a new transmission scheme for multiple antenna transmission at the base station of a wireless cellular system. We develop our new scheme in a wideband CDMA framework using multiple phases of Gold codes ...
  • Transmission Policies For Bursty Traffic Sources on Wireless Channels 

    Rajan, Dinesh; Sabharwal, Ashutosh; Aazhang, Behnaam (2001-03-20)
    In this paper, we present near-optimal transmission policies for bursty traffic sources on noisy wireless channels. We propose to minimize the packet outage probability subject to average power and average delay constraints ...
  • Transmit Diversity for CDMA-2000 

    Rajan, Dinesh; Gray, Steven D. (1999-09-20)
    Transmit diversity offers an advantage in the forward link of the cdma2000 system by balancing the spectrum efficiency in the uplink and downlink. Three schemes for performing transmit diversity are examined in this paper ...