We consider a diamond-shaped dual-hop communication system consisting a source, two parallel half-duplex relays and a destination. In a single antenna configuration, it has been previously shown that a two-phase node-scheduling algorithm, along with the decode and forward strategy can achieve the capacity of the diamond channel for a certain symmetric channel gains [1]. In this paper, we obtain...

Given an N -relay Gaussian Half-Duplex (HD) diamond network, can we achieve a significant fraction of the capacity of the full network by operating only a subset of k relays? This paper seeks to answer this question, which is also known as the network simplification problem. Building upon the recent result of Cardone et al., this work proves that there always exists a subnetwork of k = N − 1 re...

We propose LDPC code designs for the half-duplex relay channel. Our designs mimic the information theoretic random coding scheme for decode-and-forward relaying. An important advantage of our scheme is that it is built entirely of single-user codes that can be decoded by belief propagation. The optimization of relay LDPC code profiles presents unique challenges, which are met by using the densi...

In cooperative communication systems, different terminals collaborate to form a virtual-multiple antenna array system and exploit the spatial diversity to achieve a better performance. It can be generally categorized into amplify-andforward protocol and decode and-forward protocol. Among the various cooperative communication protocols which have been proposed in the past decades, the slotted co...

According to the Federal Communications Commission (FCC) [1–3], the typical radio channel occupancy is less than 15%. The Dynamic Spectral Access has been proposed as a solution to increase the spectrum usage, and to solve the problem of the scarcity in the frequency resources due to the increasing in the demand on the wireless technologies. The Cognitive Radio (CR) technology is presented as a...

In-band full-duplex (FD) communications have been optimistically promoted to improve the spectrum utilization and efficiency. However, the penetration of FD communications to the cellular networks domain is challenging due to the imposed uplink/downlink interference. This paper presents a tractable framework, based on stochastic geometry, to study FD communications in cellular networks. Particu...