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Author: search.filters.author.Khaliluzzaman, Md.Subject: search.filters.subject.ISI

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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
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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