There have been many improvements to the processing of papers we have also witnessed a significant growth in interest through a higher number of submissions as well as through the breadth and quality of those submissions. This statistics shows that IJCSIS has established the first step to be an international and prestigious journal in the field of Computer Science and Information Security. According to Google Scholar, up to now papers published in IJCSIS have been cited over 6389 times and the number is quickly increasing. It especially provides a platform for high-caliber academics, practitioners and PhD/Doctoral graduates to publish completed work and latest research outcomes. High quality research, survey & review articles are proposed from experts in the field, promoting insight and understanding of the state of the art, and trends in computer science and technology. It is our great pleasure to present the May 2016 issue Part 3 (Volume 14 Number 5 Part 3) of the International Journal of Computer Science and Information Security (IJCSIS). Analytical expressions are derived for MSE and it is verified that both analytical and simulation results are exactly matching. The mean square error (MSE) performance of the proposed estimator is analyzed with various power delay profiles applicable to LTE systems.

This allows the system to be deployed in rural areas having complex mobile environment such as more mud houses and dense trees. Hence, there is a need to develop a channel estimator giving robust performance for LTE system. However, LTE pilot structure is a combination of both block type and comb type pilot structure. These estimators do not require channel correlation functions for estimation and give robust performance independent of actual power delay profile (PDP).

Recently robust estimators are proposed for OFDM systems with block type pilot structure. This paper deals with the robust minimum mean square error (MMSE) channel estimation for LTE (Long Term Evolution) downlink OFDM (Orthogonal Frequency Division Multiplexing) system over time varying mobile environments.

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