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Articles by S. Malarvizhi
Total Records ( 3 ) for S. Malarvizhi
  Ramesh Ponnusamy , H. Abdul Raufh and S. Malarvizhi
  Trust and reputation models are utilized in the security mechanisms of MANET to deal with selfish and misbehaving nodes and ensure safe delivery of packets from source to destination. The calculation of trust values and its propagation between the nodes form the rubric of these trust models. But its effectiveness is often degraded by the propagation of fake trust values via. dishonest recommendations particularly in environments like MANET due to the lack of centralized administration and mobility of nodes. However, dealing with dishonest recommendation attacks is a highly challenging task. We propose an enhanced integrated dynamic trust recommender that filters out dishonest recommendations by clustering, filtering and selecting the recommended trust values based on certain criteria. This makes the trust reputation model more robust and accurate in the dynamically changing MANET environment.
  R. Kumar , S. Malarvizhi and S. Jayashri
  Orthogonal Frequency Division Multiplexing (OFDM) is a modern high data rate modulation technique for wireless communication systems. Due to loss of orthogonality of subcarriers intercarrier interference occurs. In this study the performance of the proposed time-domain equalization technique is compared with the existing frequency domain equalization technique. In frequency domain equalization a correlative polynomial is used in the frequency domain to suppress the ICI. In Time domain equalization technique, a window function is proposed in equivalent to the correlative polynomial used in the frequency domain. MATLAB simulation of the proposed technique shows that the time domain windowing scheme achieves better performance in ICI suppression compared to the correlative coding technique. Time domain windowing technique proposed in this study, offers better Carrier to Interference Ratio (CIR) and BER is reduced compared to the correlative coding method.
  S. Malarvizhi and M. Meenakshi
  In this study a new MAC protocol for wireless environment, on the lines of the Incremental Collision Resolution Multiple Access (ICRMA) protocol using spreading codes, called Coded Incremental Collision Resolution Multiple Access (CICRMA) protocol was proposed. In CICRMA, the channel is divided into cycles of variable length; each cycle consists of a contention period and a queue transmission period. The queue transmission period corresponds to a variable-length train of packets, which are transmitted by stations that have been added to the data transmission queue by successfully completing a collision-resolution round in the previous contention period. During the contention period, stations with packets to send compete for the right to be added to the data-transmission queue using N-ary tree-splitting algorithm, where N is the number of spreading codes used. An analytical model for the above protocol was proposed. The proposed protocol was simulated; its throughput performance was analyzed and verified with the analytical model. Jakes fading model was used for the simulation of fading channel.
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