Constrained pre-equalization accounting for multi-path fading emulated using large RC networks: applications to wireless and photonics communications

Rubens Junqueira Magalhaes Alfonso, Roberto Kawakami Harrop Galvao, Karl Heinz Kienitz, Hashem Alyami, Victor Becerra, Sillas Hadjiloucas

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    Abstract

    Multi-path propagation is modelled assuming a multi-layer RC network with
    randomly allocated resistors and capacitors to represent the transmission medium. Due to frequency-selective attenuation, the waveforms associated with each propagation path incur path-dependent distortion. A pre-equalization procedure that takes into account the capabilities of the transmission source as well as the transmission properties of the medium is developed. The problem is cast within a Mixed Integer Linear Programming optimization framework that uses the developed nominal RC network model, with the excitation waveform customized to optimize signal fidelity from the transmitter to the receiver. The objective is to match a Gaussian pulse input accounting for frequency regions where there would be pronounced fading. Simulations are carried out with different network realizations in order to evaluate the sensitivity of the solution with respect to changes in the transmission medium mimicking the multi-path propagation. The proposed approach is of relevance where equalization techniques are difficult to implement. Applications are discussed within the context of emergent communication modalities across the EM spectrum
    Original languageEnglish
    Article number364
    Number of pages20
    JournalOptical and Quantum Electronics
    Volume48
    Issue number7
    Early online date25 Jun 2016
    DOIs
    Publication statusPublished - Jul 2016

    Keywords

    • Equalization
    • RC networks
    • Percolation
    • Mixed Integer Linear Programming
    • Communications
    • Photonics

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