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      저자 : Omkumar, S. (검색결과 3 건)
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        Design and FPGA Implementation of FBMC Transmitter by using Clock Gating Technique based QAM, Inverse FFT and Filter Bank for Low Power and High Speed Applications

        Sivakumar, M.,Omkumar, S. The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.6

        The filter bank multicarrier modulation (FBMC) technique is one of multicarrier modulation technique (MCM), which is mainly used to improve channel capacity of cognitive radio (CR) network and frequency spectrum access technique. The existing FBMC System contains serial to parallel converter, normal QAM modulation, Radix2 inverse FFT, parallel to serial converter and poly phase filter. It needs high area, delay and power consumption. To further reduce the area, delay and power of FBMC structure, a new clock gating technique is applied in the QAM modulation, radix2 multipath delay commutator (R2MDC) based inverse FFT and unified addition and subtraction (UAS) based FIR filter with parallel asynchronous self time adder (PASTA). The clock gating technique is mainly used to reduce the unwanted clock switching activity. The clock gating is nothing but clock signal of flip-flops is controlled by gate (i.e.) AND gate. Hence speed is high and power consumption is low. The comparison between existing QAM and proposed QAM with clock gating technique is carried out to analyze the results. Conversely, the proposed inverse R2MDC FFT with clock gating technique is compared with the existing radix2 inverse FFT. Also the comparison between existing poly phase filter and proposed UAS based FIR filter with PASTA adder is carried out to analyze the performance, area and power consumption individually. The proposed FBMC with clock gating technique offers low power and high speed than the existing FBMC structures.

      • KCI등재

        Design and FPGA Implementation of FBMC Transmitter by using Clock Gating Technique based QAM, Inverse FFT and Filter Bank for Low Power and High Speed Applications

        M. Sivakumar,S. Omkumar 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.6

        The filter bank multicarrier modulation (FBMC) technique is one of multicarrier modulation technique (MCM), which is mainly used to improve channel capacity of cognitive radio (CR) network and frequency spectrum access technique. The existing FBMC System contains serial to parallel converter, normal QAM modulation, Radix2 inverse FFT, parallel to serial converter and poly phase filter. It needs high area, delay and power consumption. To further reduce the area, delay and power of FBMC structure, a new clock gating technique is applied in the QAM modulation, radix2 multipath delay commutator (R2MDC) based inverse FFT and unified addition and subtraction (UAS) based FIR filter with parallel asynchronous self time adder (PASTA). The clock gating technique is mainly used to reduce the unwanted clock switching activity. The clock gating is nothing but clock signal of flip-flops is controlled by gate (i.e.) AND gate. Hence speed is high and power consumption is low. The comparison between existing QAM and proposed QAM with clock gating technique is carried out to analyze the results. Conversely, the proposed inverse R2MDC FFT with clock gating technique is compared with the existing radix2 inverse FFT. Also the comparison between existing poly phase filter and proposed UAS based FIR filter with PASTA adder is carried out to analyze the performance, area and power consumption individually. The proposed FBMC with clock gating technique offers low power and high speed than the existing FBMC structures.

      • KCI등재

        Investigation on the hard turning in enhancing the surface reliability by white layer elimination using cbn semi worn-out inserts under shielding gas atmosphere

        S. Girisankar,M. Omkumar 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5

        This investigation was focused on hard turning performed under protective gas atmosphere with Argon , since this gas provides more heat sink at the thermally mechanically affected zone (TMAZ) during the hard turning conducted with semi worn-out coated CBN insert. The innate qualities of this inert gas effectively curbed the mechanisms, which are responsible for the formation of white layer, by ensuring more heat dissipation through vaporization, regulating cooling through convection and protection against environmental reactions. The recently conducted tests and their notable results have for sure established the remarkable role of this abundantly available and harmless gas in enhancing the surface reliability and the effective elimination of white layer formation.

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