Browsing by Author "Markarian, G."
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Item Open Access Novel predistortion algorithm for OFDMA(IEEE, 2009) Ali, S.; Markarian, G.; Arıkan, ErdalThe RF amplifier in a wireless communication system is usually non-linear in nature. If such an amplifier is used in OFDMA based systems, it will cause serious degradation. This degradation will be both in terms of the reduction in BER and the generation of out of band noise. In this paper we have worked on the linearization method of the amplifier. This work is on a hybrid methodology, in which estimation of the model is performed in frequency domain and compensation is performed in time domain. The downlink preamble of the IEEE802.16e system is used here for the estimation purpose. The results for the suppression of spectra are shown at the end.Item Open Access Signal combining in LINC amplifier using Alamouti codes(IEEE, 2010-09-09) Ali S.; Adebisi, B.; Markarian, G.; Arikan, E.The linear amplification with nonlinear components (LINC) amplification method is discussed. A novel way of combing the equi-magnitude signals is presented. This method uses the space time 2 × 1 Alamouti code for combining the signal at the receiver. By so doing, the combiner power loss and isolation problems inherent in this technique can be avoided.