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It is well known that, when the channel state information and noise power is perfectly known, the optimal power allocation policy is given by waterfilling procedure. In this paper, we derive the necessary and sufficient conditions for optimal power allocation policy under noise power uncertainty, and express it in terms of Hilbert transformation. A two step algorithm is developed to allocate power...
In this paper, we present a novel approach for pilot-aided channel estimation in OFDM systems with synchronous co-channel interference. The estimator is derived based on the Kullback-Leibler divergence minimization framework. The obtained solution iteratively updates both the desired user's and the interferer's channels, using a combination of linear minimum mean squared-error (LMMSE) filtering and...
Non-Gaussian statistic model, alpha stable distribution has gained much attention due to its generality to represent heavy-tailed and impulsive interference. Unfortunately, there is no closed form expression for the probability density function of alpha-stable distributions. Hereby, to develop the approximate expressions is of importance for signal detection and denoising. This paper is concerned...
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