S. M. Riazul Islam

TL;DR: In this paper , the authors present an extensive study of different types of consensus protocols used in existing blockchain solutions with the strength and limitations of each algorithm and also provide an inherent comparison among different algorithms to understand consensus protocol selection better.

Abstract: Interference reduces the performance of a correct data signal detection and decoding. This problem becomes severe when interferences exist during the period of channel estimation. This will destroy the accuracy of channel estimation, and will eventually result to severe degradation in the performance of signal detection and decoding in the entire data packet/frame. In this article, we propose an improved channel estimation technique for multiband orthogonal frequency division multiplexing (MB-OFDM) ultra-wideband (UWB) system in presence of interferences. In particular, we work towards a preamble-based channel estimation technique in multi-access and narrowband interfering environments. We construct two preamble symbols with opposite, both in amplitude and phase, sequences in frequency-domain. Time-domain redundancy is introduced into these preamble symbols before transmission. Based on this time-domain redundancy property, we eliminate multi-access interference (MAI) through an adaptive select and replace (ASR) scheme. We show that the use of opposite sequences in preambles leads a simple addition, subtraction and compare (ASC) scheme to cancel narrowband interference (NBI). In addition, we apply a frequency-domain filter, driven by channel’s power delay profile (PDP), to get a further enhancement in the estimation accuracy. Simulation results urge that our proposed technique outperforms the conventional channel estimation methods. Key words: Ultra-wideband, channel estimation, channel impulse response (CIR), multiband orthogonal frequency division multiplexing, wireless personal area network (WPAN), narrowband interference, multi-access interference, and ECMA-368.

TL;DR: A comprehensive overview of the current state and future potential of UAV technology, and the benefits and challenges associated with its use in various industries and fields is provided in this paper . But, the authors also highlight the potential advancements in UAV technologies and new applications that could emerge in the future, as well as concerns about the impact of the UAVs on society.

TL;DR: In this paper, a hybrid nano communication (HNC) system that integrates three possible modes of nano communications: terahertz communication (TC), molecular communication (MC), and neural communication (NC) is proposed.