Methods to implement communication in natural and humanmade disasters have been widely discussed the scientific community. Scientists believe that unmanned aerial vehicles (UAVs) relays will play a critical role 5G public safety communications (PSC) due their technical superiority. They several significant advantages: high degree of mobility, flexibility, exceptional line sight, real-time adapt...

Explicit codes are constructed that achieve the diversity-multiplexing gain tradeoff of the cooperative-relay channel under the dynamic decode-andforward protocol for any network size and for all numbers of transmit and receive antennas at the relays. A particularly simple code construction that makes use of the Alamouti code as a basic building block is provided for the single relay case. Alon...

This paper investigates the system achievable rate for the multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system with an energy harvesting (EH) relay. Firstly we propose two protocols, time switching-based decode-and-forward relaying (TSDFR) and a flexible power splitting-based DF relaying (PSDFR) protocol by considering two practical receiver architecture...

Owing to the vulnerability of relay-assisted and device-to-device (D2D) communications, improving wireless security from a physical layer signal processing perspective is attracting increasing interest. Hence we address the problem of secure transmission in a relay-assisted network, where a pair of legitimate user equipments (UEs) communicate with the aid of a multiple-input multiple output (MI...

In this paper, we present an analysis of mobile multihop relay (MMR) technology using cooperative multiple-input-multiple-output (MIMO) transmission. New wireless broadband protocols, such as WiMAX, and 3G-LTE apply MIMO technology, and mobile communication protocols under standardization are investigating MMR as a future technology to use. These two technologies are expected to be among the mo...

In this paper, we study the emergence of topological interference alignment and the characterizing features of a multi-user broadcast interference relay channel. We propose an alternative transmission strategy named the relay space-time interference alignment (R-STIA) technique, in which a K -user multiple-input-multiple-output (MIMO) interference channel has massive antennas at the transmitter...