Browsing by Author "Rosas, Fernando"

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    Impact of interference correlation on the decoding error statistics
    (IEEE, 2017) Rosas, Fernando; Manolakis, Konstantinos; Oberli Graf, Christian Robert; Azari, Mohammad Mahli; Verhelst, Marian; Pollin, Sofie
    Scenarios where interference is correlated with useful signals are often met in communications systems. Interestingly, even though uncorrelated interference mitigation has been extensively studied by the literature, there is still lack of insight into how correlation can affects information transfer processes. In this paper we formally address this issue and show how a positive correlation between the interference and useful signal power introduces a non-intuitive increase in the diversity gain, improving the error statistics with respect to the uncorrelated case. In contrast, the diversity gain decreases under negative correlation, degrading the system performance. These findings are confirmed by simulations for scenarios of practical relevance.
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    Modulation and SNR Optimization for Achieving Energy-Efficient Communications over Short-Range Fading Channels
    (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2012) Rosas, Fernando; Oberli, Christian
    It is commonly assumed that the energy consumption of wireless communications is minimized when low-order modulations such as BPSK are used. Nevertheless, the literature provides some evidence that low-order modulations are suboptimal for short transmission distances. No complete analysis on how the modulation size and transmission power must be chosen in order to achieve energy-efficient communications over fading channels has been reported so far. In this paper we provide this analysis by presenting a model that determines the energy consumed per payload bit transferred without error over fading channels of various statistics.