en 5-Communication Systems Communication Systems Research Paper Research Paper <div style="text-align: justify;"><span style="font-family:Times New Roman;"><span style="font-size:14px;"><span style="color:#000000;">Communication in the presence of a priori known interference at the encoder has gained great interest because of its many practical applications. In this paper, additive exponential noise channel with additive exponential interference (AENC-AEI) known non-causally at the transmitter is introduced as a new variant of such communication scenarios<strong>&lrm;</strong>. First, it is shown that the additive Gaussian channel with a priori known interference at the encoder when the transmitter suffers from a fast-varying phase noise can be modeled by the AENC-AEI. Then, capacity bounds for this channel under a non-negativity constraint as well as a mean value constraint on input are derived<strong>&lrm;</strong>. <strong>&lrm;</strong>Finally, it is shown both analytically and numerically that the upper and lower bounds coincide at high signal to noise ratios (SNRs), and therefore<strong>&lrm;</strong>, <strong>&lrm;</strong>the capacity of the AENC-AEI at high SNRs is obtained. Interestingly, this high SNR-capacity has a simple closed-form expression and is independent of the interference mean, analogous to its Gaussian counterpart.</span></span></span></div> Capacity Bounds, Dirty Paper Channel, Exponential Noise, High-SNR Capacity. 137 145 http://ijeee.iust.ac.ir/browse.php?a_code=A-10-2572-1&slc_lang=en&sid=1 M. Monemizadeh monemi@neyshabur.ac.ir 180031947532846009291 180031947532846009291 Yes Department of Electrical Engineering‎, ‎University of Neyshabur‎, ‎Neyshabur‎, ‎Iran. H. Fehri hamedfehri@uoz.ac.ir 180031947532846009292 180031947532846009292 No Department of Electrical Engineering‎, ‎‎University of Zabol‎, ‎Zabol‎, ‎Iran. Gh. Abed Hodtani hodtani@um.ac.ir 180031947532846009293 180031947532846009293 No Department of Electrical Engineering‎, Ferdowsi ‎‎University of Mashhad‎, ‎Mashhad‎, ‎Iran. S. Hajizadeh shajiz2@uic.edu 180031947532846009294 180031947532846009294 No Department of Electrical and Computer Engineering‎, ‎University of Illinois at Chicago‎, ‎Chicago‎, ‎USA.