Vinayak Tripathi

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—Incremental redundancy, or Hybrid type-II ARQ (HARQ), algorithms use a combination of forward error correction and retransmissions to guarantee reliable packet data communications. In this work, we propose a HARQ algorithm that exploits received packet reliability to improve system performance. Specifically, the receiver uses the average magnitude of the(More)
—The problem of initial acquisition of the channel parameters of a wideband CDMA signal received in a multipath fading environment with multiaccess interference is considered. Since the signal is wideband, the fading is frequency selective and the parameters of interest are the (complex) gains and delays in the corresponding tapped delay line model for the(More)
—An adaptive iterative (turbo) decision-feedback equalizer (DFE) for channels with intersymbol interference (ISI) is presented. The filters are computed directly from the soft decisions and received data to minimize a least-squares (LS) cost function. Numerical results show that this method gives a substantial improvement in performance relative to a turbo(More)
BACKGROUND Many workers have reported halotolerant bacteria from saline conditions capable of protease production. However, antibiotic resistance and heavy metal tolerance pattern of such organisms is not documented very well. Similarly, only a few researchers have reported the pattern of pH change of fermentation medium during the course of protease(More)
We develop a dynamic, general equilibrium model to understand how multinationals a¤ect host countries through knowledge di¤usion. Workers learn from their managers and knowledge di¤usion takes place through worker mobility. We identify two forces that determine wages: the labour demand e¤ect and the learning e¤ect. The former tends to raise wages while the(More)
BACKGROUND Production of alkaline protease from various bacterial strains using statistical methods is customary now-a-days. The present work is first attempt for the production optimization of a solvent stable thermoalkaline protease by a psychrotrophic Pseudomonas putida isolate using conventional, response surface methods, and fermentor level(More)
In the first chapter, we consider the problem of first-best implementation in dynamic, interdependent-value environments where agents have quasi-linear preferences and private types are correlated. Our first candidate solution (I.M.) relies on methods typically seen in games with imperfect monitoring. We derive conditions under which this approach gives the(More)
BACKGROUND Proteases play an important role in virulence of many human, plant and insect pathogens. The proteinaceous protease inhibitors of plant origin have been reported widely from many plant species. The inhibitors may potentially be used for multiple therapeutic applications in viral, bacterial, fungal diseases and physiological disorders. In(More)
We develop a dynamic, general equilibrium model to understand how multinationals affect host countries through knowledge diffusion. Workers learn from their managers and knowledge diffusion takes place through worker mobility. We identify two forces that determine wages: the labor demand effect and the learning effect. The former tends to raise wages while(More)