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Ɵ(1) Time Algorithm for Master Selection in Ad-hoc Wireless Networks

Khattabi Mohammed, Elmesbahi Jelloul, Khaldoun Mohammed, Errami Ahmed, Bouattane Omar

International Journal of Electronics and Telecommunications

2020

Vol. 66, No. 3

521--527

This paper details a hardware implementation of a distributed Ɵ(1) time algorithm allows to select dynamically the master device in ad-hoc or cluster-based networks in a constant time regardless the number of devices in the same cluster. The algorithm allows each device to automatically detect its own status; master or slave; based on identifier without adding extra overheads or exchanging packets that slow down the network. We propose a baseband design that implements algorithm functions and we detail the hardware implementation using Matlab/Simulink and Ettus B210 USRP. Tests held in laboratory prove that algorithm works as expected.

Enabling Wireless In-band Full-duplex

Elmesbahi Jelloul, Khaldoun Mohammed, Errami Ahmed, Khattabi Mohammed El, Bouattane Omar

International Journal of Electronics and Telecommunications

2019

Vol. 65, No. 3

429--434

This paper presents a baseband model and an enhanced implementation of the wireless full duplex analog method introduced by [1].Unlike usual methods based on hardware and software self- interference cancelation, the proposed design relies on FSK modulation. The principle is when the transmitter of a local end is sending data by modulating the carrier with the appropriate frequency deviation, its own receiver is checking if the remote transmitter is using the opposite deviation. Instead of architectures often used by both non-coherent and coherent receivers that require one filter (matched filter for coherent detection) for each frequency deviation, our design uses one mixer and one single integrator-decimator filter. We test our design using Universal Software Radio Peripheral as radio frequency front end and computer that implements the signal processing methods under free and open source software. We validate our solution experimentally and we show that in-band full duplex is feasible and synthesizable for wireless communications.