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In this paper, we study the power allocation for both regenerative and non-regenerative relay transmission over Rayleigh fading channels in cognitive networks. Based on the analyses of features of cognitive networks, a relevant interference model is first built over Rayleigh fading channels. Then, we propose a combined power allocation strategy in order to minimize the outage probabilities in the...
In this paper, we investigate the relation of Mutual Interference Avoidance and Modulation Mode that aims at maximizing the capacity in OFDM-based opportunity spectrum access(OSA) systems. The continue phase modulation techniques for OFDM systems are considered.We try to decrease the mutual interference between the SUs channel and license frequencies. We show that the traditional PSK modulation with...
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