Browsing by Author "Chy., Deepak Kumar"

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    Comparative Performance of BER in the Simulation of Digital Communication Systems using Raised Cosine Filter
    (International Journal of Advancements in Communication Technologies– IJACT, 2015-10-30) Chy., Deepak Kumar; Khaliluzzaman, Md.
    The robustness of the digital communication system is illustrated by comparing the BER and SER with and without filter. This research entails the development of a digital communication model that transmits base band data over an additive white Gaussian noise channel (AWGN). The performance of this model is enhanced by employing raised cosine filter which reduce the BER and SER compared to model without filter. The results show that the performance of the system improves when filter is implemented. The performance of 16-QAM is found to be better than that of 32-QAM and 64-QAM, which means that there must be a tradeoff between BER and energy efficiency of Modulation schemes of QAM. In this paper inter symbol interference (ISI) is examined and It is seen that ISI place an important role in digital communication systems. This paper also observed that overall transmission errors are less while increasing the ratio of bit energy per symbol (Eb /N0 ). Matlab communication tool box has been used for simulation
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    Evaluation of SNR for AWGN, Rayleigh and Rician Fading Channels Under DPSK Modulation Scheme with Constant BER
    (International Journal of Wireless Communications and Mobile Computing, 2015-02-06) Chy., Deepak Kumar; Khaliluzzaman, Md.
    With the growing demand in modern communication, it has become necessary to give better and efficient service to users by using better technique. Technique such as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Differential Phase shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM) are very important parts of the implementation of modern communications systems in which DPSK is the simplest and most robust of all techniques. In this paper, evaluation of SNR in terms of constant bit error rate is performed on AWGN, Rayleigh and Rician fading channels. Among these channels, Rician is showing better performance as compared to AWGN and Rayleigh
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    Improving Handover Performance in HMIPv6 Using Area Border Routers in Wireless Mobile Networks
    (Journal of Telecommunications, 2012-03) Khaliluzzaman, Md.; Chy., Deepak Kumar; Akter, Madina
    Hierarchical Mobile IPv6 (HMIPv6) introduces a mobility anchor point (MAP) that localizes the signaling traffic and hence reduces the handoff latency. To support inter-area handovers, several methods have been proposed in the literature to address the challenging problems of minimizing the handoff signaling delay and call blocking probability for Hierarchical Mobile IP version 6 (HMIPV6). In this paper, we propose a new concept for inter area handovers to solve signaling delay and call blocking probability. In this concept, the border zone is made between two different neighboring cells. Each neighboring cells is assigned as MAP region. Since the border zone is an overlapping MAP region, MHs can maintain the same MAP as long as they remain inside the border zone.
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    Performance Analysis of Digital Communication Systems in Presence of AWGN Implementing Filter Technique
    (International Journal of Computer Applications, 2015-12) Chy., Deepak Kumar; Khaliluzzaman, Md.; Faruque, Faisal
    In digital communication system, data must encounter in a band limited environment. The fact is that constraining the bandwidth of the transmitted signal necessarily increases the probability of BER at the receiver. The system performance in terms of BER is evaluated with as well as without filter developing digital communication model. The likelihood of BER and SER is compared. The results show that Raised Cosine filter exhibits almost equal performance in comparison with rest of the filters. The worst case scenario is obtained while introducing no filtering technique despite applying the modulation scheme QAM. Roll off factor 0.22 has taken into account as Raised cosine filter act as FIR filter at that factor. In this paper inter symbol interference (ISI) is examined and it is seen that ISI plays an important role in digital communication systems. It is also observed that overall transmission errors are less while increasing the ratio of bit energy per symbol (Eb/N0). MATLAB communication environment has been used for simulation