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Bareilly, India

Sharma C.,Rohilkhand University | Tomar S.K.,Dehradun Institute of Technology | Gupta A.K.,National Institute of Technology Kurukshetra
WSEAS Transactions on Communications

In this paper we propose the Peak to Average Power ratio reduction (PAPR) in OFDM using adapting coding technique with pre-distortion method to decrease the nonlinear distortion and to improve the power efficiency of the non-linear high power amplifier (HPA). In the proposed method adaptive coding is used for error correction as well as PAPR reduction. The pre-distorter improves the bit error rate performance of the system. Source

Gupta A.,Rohilkhand University | Dubey K.K.,Invertis University
Proceedings of the 2013 3rd IEEE International Advance Computing Conference, IACC 2013

This paper introduces a state of art compressor for DNA sequences that makes use of a replacement method. The replacement method introduces words and a word based compression scheme is used for encoding. The encoder uses frequency distribution for assigning the code of words. The designed statistical compression algorithm is efficient and effective for DNA sequence compression. Experiments show that our algorithm is shown to outperform existing compressors on typical DNA sequence datasets. © 2013 IEEE. Source

Sanjeev,Rohilkhand University | Chakrabarti P.,Indian Institute of Technology BHU Varanasi
Infrared Physics and Technology

The numerical model of a Mid-infrared (MIR) P+-InAs0.48Sb0.22P0.30/n0-InAs0.89Sb0.11/N--InAs0.48Sb0.22P0.30 double heterostructure light emitting diode (DH-LED) has been reported in this paper. The governing equation of the structure has been solved numerically under the condition of high injection using fourth order Runge-Kutta method employing the shooting algorithm. The numerical model takes into account all dominant radiative and non-radiative recombination processes, surface recombination velocity and self-absorption in the active layer of DH-LED. The DH-LED has been simulated for mid-infrared applications by considering modulation bandwidth and its dependence on active layer width, doping concentration, and injected carrier density. The effect of surface recombination velocity on the quantum efficiency, peak light intensity for different values of active layer width and doping concentration has been estimated numerically. The rise time of the structure has been evaluated by considering transient response for a step current of 50 mA. The output power of DH-LED has been computed as a function of bias current and compared/ contrasted with the reported analytical and experimental results. © 2014 Elsevier B.V. All rights reserved. Source

Sanjeev,Rohilkhand University | Chakrabarti P.,Indian Institute of Technology BHU Varanasi
Opto-electronics Review

In this paper, simulation studies on an N+-InAs 0.61Sb0.13P0.26/n0-InAs 0.97Sb0.03/P+-InAs0.61Sb 0.13P0.26 double heterostructure laser diode suitable for use as a source in a free space optical communication system at 3.7 μm at room temperature has been presented. The device structure has been characterized in terms of energy band diagram, electric field profile, and carrier concentration profile using ATLAS simulation tool from Silvaco. The current-voltage characteristics of the structure have been estimated taking into account the degeneracy effect. The results of simulation have been validated by the reported experimental results. © 2014 Versita Warsaw and Springer-Verlag Wien. Source

Singh S.,Central Avian Research Institute | Yadav A.S.,Central Avian Research Institute | Singh S.M.,Rohilkhand University | Bharti P.,Central Avian Research Institute
Food Research International

An investigation was carried out to study the dynamics of Salmonella occurrence in chicken eggs during production at farm level and subsequently in marketing channels (both whole sale and retail markets) in north India and to select an effective antimicrobial agent for the control of Salmonella in poultry birds. A total of 560 chicken eggs comprising 260 from poultry farms and 300 from marketing channels were collected and screened for the presence of Salmonella during the period of April 2006 to July 2007. Twenty seven (4.82%) of the samples tested were found to be positive for Salmonella. Among the chicken eggs from poultry farms and marketing channels, 10 (3.84%) and 17 (5.5%) eggs were positive for Salmonella, respectively. Among the isolates, S. Typhimurium was the predominant serovar. Antibiogram testing revealed multi-drug resistance among Salmonella isolates from chicken eggs collected from poultry farms and marketing channels in north India. All the isolates were resistant to bacitracin, polymyxin-B and colistin, whereas sensitivity was recorded for ciprofloxacin, streptomycin and enrofloxacin. © 2010 Elsevier Ltd. Source

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