International Conference on Intelligent Computing and Systems
49
International Conference on Intelligent Computing and Systems 2017 [ICICS 2017]
ISBN Website Received Article ID
978-81-933235-5-7 icics.asia 10 – January – 2017 ICICS097
VOL eMail Accepted eAID
01 icics@asdf.res.in 28 - January – 2017 ICICS.2017.097
A Reconfigurable Adaptive Viterbi Decoder Using Trace back Scheme 1,2
Asir Nath1, Gomathi P2 NSN College of Engineering and Technology, India
Abstract: Trellis coded modulation (TCM) schemes are used in many bandwidth- efficient systems. Typically, a TCM system employs a high-rate convolutional code, which leads to a high complexity of the Viterbi decoder (VD) for the TCM decoder, even if the constraint length of the convolutional code is moderate. High-speed, low-power design of Viterbi decoders for trellis coded modulation (TCM) systems is presented. An adaptive decoding algorithm, which is a modification of the Viterbi algorithm (VA) is presented. For a given code, the proposed algorithm yields nearly the same error performance as the VA while requiring a substantially smaller average number of computations. Unlike most of the other suboptimum algorithms, this algorithm is self-synchronizing. If the transmitted path is discarded, the adaptive Viterbi algorithm (AVA) can recover the state corresponding to the transmitted path after a few trellis depths. It is well known that the Viterbi decoder (VD) is the dominant module determining the overall power consumption of TCM decoders. We propose a pre-computation architecture incorporated with T -algorithm for VD, which can effectively reduce the power consumption without degrading the decoding speed much. A general solution to derive the optimal pre-computation steps is also given in the paper. Implementation result of a VD for a rate-3/4 convolutional code used in a TCM system shows that compared with the full trellis VD, the precipitation architecture reduces the power consumption by as much as 15% without performance loss.
ISBN Website Received Article ID
978-81-933235-5-7 icics.asia 10 – January – 2017 ICICS098
VOL eMail Accepted eAID
01 icics@asdf.res.in 28 - January – 2017 ICICS.2017.098
Monitoring Contingency Power Flow in the Smart Grid by Using Embedded System 1,2
Loganathan R1, Gomathi P2 NSN College of Engineering and Technology, India
Abstract: Synchronization is used to minimization of voltage, frequency and phase angle between the corresponding phases of generator. Smart grid mainly implement in the Renewable energy sources, energy efficient sources, smart appliances. By using the smart grid the information recording the grid will get in more secure, efficiently. But in smart grid also synchronization failure has occurring due to voltage variation, frequency mismatch during synchronization. To overcome for these, implementing the embedded system design is to find out the failure reason of synchronization and rectify the failure by varying the voltage and frequency. Before connecting the generated power to grid the system verify the grid voltage and frequency then the system also verifies voltage and frequency generated by the generator. If variation occurs in grid and generator then embedded system will vary generator voltage or frequency otherwise if variation in large value the then the synchronization will disconnect. Internet of Thing is implemented in this paper to find the reason of synchronization failure and process to rectify the synchronization failure. This paper is prepared exclusively for International Conference on Intelligent Computing and Systems 2017 [ICICS 2017] which is published by ASDF International, Registered in London, United Kingdom under the directions of the Editor-in-Chief Dr M Sivaraja and Editors Dr. Daniel James, Dr. Kokula Krishna Hari Kunasekaran and Dr. Saikishore Elangovan. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage, and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honoured. For all other uses, contact the owner/author(s). Copyright Holder can be reached at copy@asdf.international for distribution.
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