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Articles by R. Krishnamoorthy
Total Records ( 3 ) for R. Krishnamoorthy
  Selvakumar K. and R. Krishnamoorthy
  Space-Time Block Coding (STBC) is a promising spatial diversity technique for future wireless communications systems. The combination of STBC and Code Division Multiple Access (CDMA) technology has the potential to increase the users performance in wireless communication networks. Space Time Transmit Diversity (STTD) is the extension of Space-Time Block Coding (STBC) to code division multiple access (CDMA) systems. To date, most discussions of STTD either assumed flat fading or ignored the Inter-Symbol and Multi-Access Interference (ISI and MAI) induced by frequency selective fading. MAI and ISI can pass an unacceptable break down in STTD performance with conventional; interference is limited only by channel estimation. RAKE receiver is used in the CDMA system to gain the multipath diversity. In this study, we combine the new orthogonal polynomial based on STBC extended with CDMA 2000(STTD), so as to avoid ISI and MAI. Simulation results show that the increased accuracy of the channel estimation schemes significantly improves the Bit Error Rate (BER) performance.
  S. Kamala Kannan , B. Prabhu Dass Batvari , P. Devarajan , P. Periakali , R. Krishnamoorthy , N. Rajeshwara Rao , S.G.D. Sridhar , P.N. Ballukraya , K.K. Sharma and M. Jayaprakash
  In the present study, available herbal resources among the 96 villages around Pulicat Lake have been isolated, identified and located using global positioning system. Nearly 34 species of herbal plants belonging to 24 families have been observed in these villages. Analysis of 27 plant and 27 soil samples for concentrations of toxic heavy metals (cadmium, chromium and lead) reveals relatively higher concentrations of cadmium (4.81 μg mL-1) and chromium (1.472 μg mL-1) in the plants when compared with the soil samples. In addition to this, 22 water samples were collected and their physiochemical parameters like pH, salinity, chloride, carbonate and bicarbonate were analyzed. The results obtained indicate that pH and chloride do not seem to influence the bioavilability of toxic heavy metals. Further work is required to establish the relationships among physiochemical characters of the water, soil, accumulation of heavy metals in plants and their physiology.
  S. Kamala Kannan , K.J. Lee , R. Krishnamoorthy , A. Purusothaman , K. Shanthi and N. Rajeshwara Rao
  Ennore creek sediments are often severely polluted with the heavy metal chromium. Several chromium-resistant bacteria were isolated and identified from the sediments and all the isolates exhibited multi-metal resistance. Chromate reduction assay showed that the isolated Bacillus cereus ECD strains were able to reduce chromate up to 76.1% at a concentration of 100 μg mL-1. Growth of the Bacillus species in the presence of increasing concentration of chromate was also determined. Since the Bacillus cereus ECD strain has high resistance to chromate and other metals and also reduces chromate under aerobic conditions, this bacterium might be potentially applicable for the treatment of metal- based industrial effluents.
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