Does clientelism perpetuate the weak state capacity that characterizes many young democracies? Prior work explains clientelist parties skew public spending to private goods and under-supply goods. Building on these insights, this article argues creates a bureaucratic trap. Governments rely invest in labour-intensive, low-skilled bureaucracies can design implement relatively more straightforward...

We investigate the capacity of three symmetric quantum states in three real dimensions to carry classical information. Several such capacities have already been defined, depending on what operations are allowed in the protocols that the sender uses to encode classical information into these quantum states, and that the receiver uses to decode it. These include the C1,1 capacity, which is the ca...

Massive multiple-input multiple-output technology has been considered a breakthrough in wireless communication systems. It consists of equipping a base station with a large number of antennas to serve many active users in the same time-frequency block. Among its underlying advantages is the possibility to focus transmitted signal energy into very short-range areas, which will provide huge impro...

In this paper, we analyze the semiblind mutual information (MI) between the input and output of a MIMO channel. To that end we consider the popular block fading model. We assume that some training/pilot symbols get inserted at the beginning of each burst. We show that the average MI over a transmission burst can be decomposed into symbol position dependent contributions. The MI component at a c...

Enhancing Channel Estimation in Cognitive Radio Systems by means of Bayesian Networks P.Demestichas, A.Katidiotis K.Tsagkaris, E.Adamopoulou, K.Demestichas (1) University of Piraeus, Piraeus, Greece Telephone: +30 210 414 27 58, Fax: +30 210 414 25 34 Email: [email protected] Url: www.unipi.gr (2) National Technical University of Athens, Athens, Greece Abstract – This paper proposes enhancements...

In this paper, we investigate a general class of partial channel state information feedback strategies for communication over flat fading multiple antenna channels with t transmitters and r receivers. Specifically, we consider scenarios where the partial channel state information is sent back from the receiver to the transmitter in the form of n beamformer vectors with corresponding power alloc...

In this two-part paper, we consider the transmission of confidential data over wireless wiretap channels. The first part presents an information-theoretic problem formulation in which two legitimate partners communicate over a quasi-static fading channel and an eavesdropper observes their transmissions through another independent quasi-static fading channel. We define the secrecy capacity in te...