Synchronization of the carrier frequency offset (CFO) in the uplink of OFDMA systems is a complex task because each user presents a different CFO. It is performed in two stages: estimation and compensation. Although a few existing schemes already achieve good performance in terms of bit error rate (BER), all of them perform huge amounts of operations, specially during estimation, thus leading t...

Vehicular positioning in urban canyons or covered areas such as car parks is a challenging issue due to the limited availability or lack of Global Navigation Satellite System (GNSS) signals. Tackling this problem, the concept of Cooperative Positioning (CP) has recently emerged for positioning or positioning enhancement in Vehicular Ad-Hoc Networks (VANETs). In the literature, CP techniques are...

This article presents a systematic approach to formulate and experimentally validate novel Complex Fractional Order (CFO) Linear Quadratic Integral Regulator (LQIR) design enhance the robustness of inverted-pendulum-type robotic mechanisms against bounded exogenous disturbances. The CFO controllers, an enhanced variant conventional fractional-order are realised by assigning pre-calibrated compl...

MIMO OFDM is a very promising technique for future wireless communication systems. By applying direct conversion architecture, low-cost, low-power, small size and flexible implementation of MIMO OFDM systems can be realized. However, the performance of direct conversion architecture based MIMO OFDM systems can be seriously affected by RF impairments incl. Carrier Frequency Offset (CFO) and I/Qi...

In this paper we propose a frequency-domain equalization technique for OFDM transmission over frequency-selective channels. We consider the case where the analog front-end suffers from an IQ imbalance and the local oscillator suffers from carrier frequency-offset (CFO). Besides we consider the channel delay spread is larger than the cyclic prefix (CP). This means that interlock interference is ...

Channel estimation at millimeter wave (mmWave) is challenging when large antenna arrays are used. Prior work has leveraged the sparse nature of mmWave channels via compressed sensing based algorithms for channel estimation. Most of these algorithms, though, assume perfect synchronization and are vulnerable to phase errors that arise due to carrier frequency offset (CFO) and phase noise. Recentl...

The post-separation of powder catalysts restricts the practical application peroxymonosulfate (PMS)-based advanced oxidation technology. Hence, we fabricated CuO-Fe2O3-modified Ni foam (CFO-NF) using a facile hydrothermal method for an efficient PMS activation. CFO-NF/PMS system could achieve 97.9% tetracycline hydrochloride (TC) removal efficiency in 60 min with four pieces CFO-NF and 0.4 mmol...

Tuning the properties of magnetic materials by voltage-driven ion migration (magneto-ionics) gives potential for energy-efficient, non-volatile memory and neuromorphic computing. Here, we report large changes in moment at saturation (mS) coercivity (HC), 34% 78%, respectively, an array CoFe2O4 (CFO) epitaxial nanopillar electrodes (∼50 nm diameter, ∼70 pitch, 90 height) with applied voltage −10...