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A broadband direct-demodulator based on nolen matrix for 5G wireless communication systems.


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Shafah, Esam Abdusalam (2019). A broadband direct-demodulator based on nolen matrix for 5G wireless communication systems. Mémoire. Québec, Université du Québec, Institut national de la recherche scientifique, Maîtrise en télécommunications, 100 p.

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The development of low cost, low power receiver (low power signal demodulation) is indispensable for the next generation of wireless communication, which is defined as a green communication system. The multiport reflectometer is a measurement device that mainly used in high-frequency bands. This technique allows the measurement of the amplitude ratio and the phase difference of two electromagnetic waves. Besides, it can be used as a direct demodulator. The framework of the conventional six-port is not adapted to millimeter-wave applications. In fact, the input and output ports arrangement are not suitable for the integrated system where both inputs and output are not separated. A new multi-port reflectometer based on Nolen matrix with a centre frequency of 28 GHz is proposed and analyzed. The Input and output ports are rearranged separately. The two inputs represent the local oscillator (LO) and the radio frequency (RF) signals, where RF and LO signals are fed to the inputs (port 6 and port 1), respectively. In addition, I and Q signals are retrieved after the detection stage at the four output ports (ports 2 - 5). The obtained structure represents the aimed arrangement in terms of suitability of use when inputs and outputs are separated each in one side, and good performance is fulfilled. The designed 2x4 Nolen matrix consists of five hybrid couplers (two 3dB, two 4.7 dB, and one 6 dB) and the proposed double T-shape phase shifter. The circuit is simulated and fabricated to validate the introduced scheme. Advanced Design System (ADS) software is used to design the different components. Both processes, the simulation and the fabrication, have shown a good agreement in terms of retrieving the original signal and implying the aimed arrangement. The obtained results of isolation are better than 20 dB for the frequency range from 26 GHz to 30.4 GHz. Good power equality is achieved of less than 1.5 dB around 7.5 dB of supplemental insertion loss and phase unbalance of ± 8 degree. The proposed circuit is low cost, small size simple structure with good performance and suitable configuration arrangement with separate inputs and outputs. This study has been made to show that the proposed multi-port based on Nolen matrix can be more adequate for the next generation millimeter wave communications compared to the conventional millimeter wave receivers.

Type de document: Thèse Mémoire
Directeur de mémoire/thèse: Djerafi, Tarek
Mots-clés libres: Advanced Design System (ADS); multi-port receiver; local oscillator (LO); radio frequency (RF), and Nolen matrix
Centre: Centre Énergie Matériaux Télécommunications
Date de dépôt: 25 juill. 2019 18:09
Dernière modification: 25 juill. 2019 18:09
URI: https://espace.inrs.ca/id/eprint/8453

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