In this paper, the ergodic capacity of parallel channels is investigated with a view to designing the power allocation strategies that optimise this performance measure under the assumption that perfect, instantaneous channel knowledge is available at the receiver whereas the transmitter only has knowledge of the fading distributions and/or the first and second moments of the subchannel gains. ...

In a two-tier cellular network, macrocells and femtocells coexist. Since femtocells use low transmission power and share network resources with macrocells, they are considered as one of the promising solutions to highly congested network environments. However, since femtocells are deployed in a selforganized manner without cell-planning, they cause severe downlink interference to macro users. T...

The purpose of semi-blind channel identi cation methods is to exploit the information used by blind methods and the information coming from known symbols. The main focus of this paper is the study of deterministic quadratic semi{ blind algorithms which are of particular interest because of their low computational complexity. The associated criteria are formed as a linear combination of a blind ...

An interpolation-based maximum likelihood channel estimation scheme using OFDM pilot symbols is proposed. Instead of direction estimation of the frequency response on each subchannel, an interpolation filter is used on the pilot symbols to estimate a smaller set of coefficients that are sufficient to characterize the multipath channel. The actual frequency responses on the subchannels are then ...

In Part I of this paper, a class of multicarrier systems was proposed to study the effect of the method of diversity allocation on the performance of coherent multiuser communication systems operating over fading channels. In this part of the paper, optimization over the proposed class of systems is considered for a fixed number of users per unit bandwidth. The first case studied is a system wh...