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Int J Electron Commun 2020 Aug 24;123:153322. Epub 2020 Jun 24.

Electronics and Electrical Communications Engineering Dept., Faculty of Electronic Engineering, Menoufia University, Egypt.

In this paper, an efficient beamforming technique at the aggregator node in the patient wireless body area network (WBAN) is proposed to improve the communication performance with the gateway node using C-shaped switched-beam antenna arrays. This proposed technique provides high gain beams towards the gateway node which may be located indoor or outdoor based on the medical quarantine or isolation topology and help medical staff monitor patients with less contact and infection probability. Also, a semi-blind switched-beam algorithm is developed to both reduce the processing time required for beam selection and reduce the power loss due to the off-mainlobe orientation of the selected beam with the signal direction. Read More

Int J Electron Commun 2020 Aug 1;123:153295. Epub 2020 Jun 1.

Laboratory of Micro-Electro Thermal Systems (METS), National Engineers School of Sfax, University of Sfax B.P. 1173, Sfax 3038, Tunisia.

The performance of differential up-conversion passive mixer operating in the 3-5 GHz band for UWB transmitter driven by 25% duty-cycle clocks is studied and analyzed. A reasonably accurate LTI equivalent circuit accounting for harmonics is derived. We have demonstrated that the conversion gain, input and output impedances of the proposed LTI equivalent circuit matches those of the LTV up-conversion passive mixer. Read More

Int J Electron Commun 2020 Jun 22;120:153207. Epub 2020 Apr 22.

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China.

This article presents a novel single-feed circularly polarized patch antenna for dual-band (2.6 and 3.4 GHz) applications. Read More

Int J Electron Commun 2014 Oct;68(10):958-968

University of Erlangen-Nuremberg, Institute for Information Transmission, Cauerstr. 7, 91058 Erlangen, Germany.

Unique word-orthogonal frequency division multiplexing (UW-OFDM) is a novel signaling concept where the guard interval is implemented as a deterministic sequence, the so-called unique word. The UW is generated by introducing a certain level of redundancy in the frequency domain. Different data estimation strategies and the favourable bit error ratio (BER) performance of UW-OFDM, as well as comparisons to competing concepts have already extensively been discussed in previous papers. Read More