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In this paper, the quasi-convexity of a sum of quadratic fractions in the form Σi=1n [(1+ci x2)/((1+dix)2)] is demonstrated where ci and di are strictly positive scalars, when defined on the positive real axis R+. It will be shown that this quasi-convexity guarantees it has a unique local (and hence global) minimum. Indeed, this problem arises when considering the optimization of the weighting coefficient...
This paper addresses the issue of the optimization of the regularization constant in semi-blind channel estimation techniques, in which the training sequence-based criterion is combined linearly with the blind subspace criterion. In such semi-blind estimation techniques, the optimization of the regularizing constant with respect to the channel estimation error is mandatory, otherwise, the expected...
Multi-input multi-output (MIMO) wireless communication systems provide large capacity allowing high data rate transmission. However, this huge increase of the capacity requires perfect channel state information at the Receiver (CSIR). We, first, compare different MIMO channel estimation techniques regarding channel estimation performances. Then, we compare the ergodic capacity of the MIMO channel...
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