Papers by Kosalendra Eethamakula
Analytical Study on Infra Red Radiation for Optical Wireless Communication for Inter-Chip Optics
The utilization of infrared radiation as a mechanism for fast, short-extend remote advanced commu... more The utilization of infrared radiation as a mechanism for fast, short-extend remote advanced communication is talked about. At present accessible infrared connections and neighborhood are portrayed. Points of interest and disadvantages of the infrared medium are contrasted with those of radio and microwave media. Submerged remote communications can be brought out through acoustic, radio recurrence (RF), and optical waves. Contrasted with its transmission capacity restricted acoustic and RF partners, submerged optical remote communications (UOWCs) can bolster higher information rates at low inertness levels. Be that as it may, extreme amphibian channel conditions (e.g., ingestion, scattering, disturbance, and so on.) present incredible challenges for UOWCs and altogether lessen the feasible communication ranges, which require efficient networking and confinement arrangements. The exhibition of these techniques within the sight of multipath distortion is measured. Techniques for multip...
Nowadays, the development and improvement of the digital broadcasting techniques and video compre... more Nowadays, the development and improvement of the digital broadcasting techniques and video compression methods have big demand in the television and telecommunication market. In case of mobile terminals and phones the DVB-H and DVB-SH standards define the video reception. In case of the DVB-SH standard the key feature is that it is a hybrid satellite-terrestrial system that will allow using a satellite to achieve large coverage area. In this paper we survey the existing work and the general introduction about DVB-SH standard.
Vertical and latitudinal wave forcing observed with network of Radars over Indian region
2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
It is well known that gravity waves and tides play an important role in delineating the middle at... more It is well known that gravity waves and tides play an important role in delineating the middle atmospheric structure and dynamics. Significant advancement has been in recent days in understanding the role of gravity waves and tides using different techniques in the lower, middle and upper atmosphere. However, only few results are available with simultaneous observations of all the three regions mentioned above. Further, no effort has been made so far in dealing with the latitudinal forcing of these waves and tides. With the establishment of advanced meteor radar at Sri Venkateswara University, Tirupati (13.63°N, 79.4°E) and up gradation of MF radar at Kolhapur (16.8°N, 74.2°E) together with existing MST radar at Gadanki (13.5°N, 79.2°E), Meteor radar at Thumba (8.5°N, 77°E) and MF radar located at Tirunalveli (8.7°N, 77.8°E) forms a unique network to address lower atmospheric forcing and its impact on middle and upper atmospheric structure and dynamics. All the above mentioned radars have been operated for few days simultaneously for investigating the short period gravity waves and tides (diurnal, semi-diurnal and ter-diurnal). Using simultaneous MST radar, Rayleigh lidar located at Gadanki and SVU meteor radar, lower atmospheric forcing and its impact of upper atmospheric is investigated. First results on short period gravity waves and tides are presented. Large day-to-day day variability in gravity waves and tides is observed within a station and among the stations providing insight on vertical and lateral coupling. Thus, long-term measurements with all the above mentioned instruments is planned to address effectively the vertical and latitudinal wave forcing.
With data storage and sharing services in the cloud, users can easily modify and share data as a ... more With data storage and sharing services in the cloud, users can easily modify and share data as a group. To ensure share data integrity can be verified publicly, users in the group need to compute signatures on all the blocks in shared data. Different blocks in shared data are generally signed by different users due to data modifications performed by different users. For security reasons, once a user is revoked from the group, the blocks which were previously signed by this revoked user must be re-signed by an existing user. The straight forward method, which allows an existing user to download the corresponding part of shared data and re-sign it during user revocation, is inefficient due to the large size of shared data in the
Journal Geophysical Research, 2014
An advanced meteor radar, viz, Sri Venkateswara University (SVU) meteor radar (SVU MR)operating a... more An advanced meteor radar, viz, Sri Venkateswara University (SVU) meteor radar (SVU MR)operating at 35.25 MHz, was installed at Sri Venkateswara University (SVU), Tirupati (13.63°N, 79.4°E), India, inAugust 2013 for continuous observations of horizontal winds in the mesosphere and lower thermosphere(MLT). This manuscript describes the purpose of the meteor radar, system configuration, measurementtechniques, its data products, and operating parameters, as well as a comparison of measured mean windsin the MLT with contemporary radars over the Indian region. It is installed close to the Gadanki (13.5°N,79.2°E) mesosphere-stratosphere-troposphere (MST) radar tofill the region between 85 and 100 km wherethis radar does not measure winds. The present radarprovides additional information due to its highmeteor detection rate, which results in accurate wind information from 70 to 110 km. As afirst step, wemade a comparison of SVU MR-derived horizontal winds in the MLT region with those measured by similarand different (MST and MF radars) techniques over the Indian region, as well as model (horizontal windmodel 2007) data sets. The comparison showed an exquisite agreement between the overlapping altitudes(82–98 km) of different radars. Zonal winds compared very well, as did the meridional winds. The observeddiscrepancies and limitations in the wind measurement are discussed in the light of different measuringtechniques and the effects of small-scale processes like gravity waves. This new radar is expected to play animportant role in our understanding of the vertical and lateral coupling of different regions of the atmosphere that will be possible when measurements from nearby locations are combined.
LTE Based SUI Modeling For FLIP-OFDM To Analyse The Performance Of Optical Wireless Communication
International Journal of Research, 2017
EM spectrum is considered as scariest assets in the world as the request is increasing and resour... more EM spectrum is considered as scariest assets in the world as the request is increasing and resources are keep on reducing. Along with time, traffic is increasing and OWC is thinking about as promising method for utilizing RF resources in effective way particularly in short and medium range of communications. In this paper, To extract nonnegative signals in optical wireless communication (OWC) systems, flipped orthogonal frequency division multiplexing (Flip-OFDM) transmits the positive and negative parts of the signal more than two back to back OFDM subframes (positive sub frame and negative subframe, individually).As the conventional receiver are used to transmit the data by subtracting the negative frame from the positive subframe. Due to the subtraction of negative frame there will be data loss. Because the signal analysis shows that the information will be transmitted by both the subframes. An efficient flip OFDM mechanism is utilized along with iterative receiver to improve the...
Advanced Meteor radar at Tirupati: System details and first results
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Papers by Kosalendra Eethamakula