This paper concerns two-hop communication over relay-assisted Block fading channel. It is assumed there is not a direct link between the transmitter and the affiliated destination and the communication occurs in two hops through the use of a relay, where the amplify and forward (AF) strategy is employed at this node. In this case, in a Rayleigh block fading channel, the optimal weight function ...

A practical communication channel often suffers from constraints on input other than the average power, such as the peak power constraint. In order to compare achievable rates with different constellations as well as the channel capacity under such constraints, it is crucial to take these constraints into consideration properly. In this paper, we propose a direct approach to compare the achieva...

Optimal power allocation for multiple-input multiple-output radar waveform design subject to combined peak and sum power constraints using two different criteria is addressed in this paper. The first one is by maximizing the mutual information between the random target impulse response and the reflected waveforms, and the second one is by minimizing the mean square error in estimating the targe...

Cognitive radio (CR) and full-duplex (FD) have received extensive attention research due to their high spectrum efficiency, which can effectively solve the problem of low efficiency in current communication systems. Based on CR FD techniques, this paper, a sharing networks is considered, both secondary users (SU1 SU2) are each equipped with dual antennas, one antenna used transmit signals, othe...

This paper aims at investigating the superiority of power allocation strategies, based on calculus of variations in a point-to-point two-way relay-assisted channel incorporating the amplify and forward strategy. Single and multilayer coding strategies for two cases of having and not having the channel state information (CSI) at the transmitters are studied, respectively. Using the notion of cal...

In this paper, new upper and lower bounds are proposed for the capacity of discrete-time Laguerre channel. Laguerre behavior is used to model vorious types of optical systems and networks such as optical amplifiers, short distance visible light communication systems with direct detection and coherent code devision multiple access (CDMA) networks. Bounds are derived for short distance visible li...

In this paper, novel Dual-Functional Radar-Communication (DFRC) waveforms with peak average power ratio (PAPR) constraint are designed, which under the multiple-input multiple-output (MIMO) radar-communication system. The DFRC transmitted by multiple antennas can send communication information to many downlink cellular users and detect radar targets simultaneously. An optimization model is esta...