Quadrature spatial modulation (QSM) is a recent digital multiple-input multiple-output (MIMO) transmission technique. Combined with cooperative relaying, QSM improves the overall spectral efficiency and enhances the communication reliability. In this paper, we study the performance of QSM amplify-and forward cooperative relaying systems. In particular, a closed-form expression for the average p...

In this paper, we study a cooperative cognitive radio network (CCRN) where the secondary user-transmitter (SU-Tx) assists bi-directional communication between a pair of primary users (PUs) following the principle of two-way relaying. In return, it gets access to the spectrum of the PUs to enable its own transmission to SU-receiver (SU-Rx). Further, in order to support sustainable operation of t...

D2D offloading reduces the load of cellular network by asking mobile nodes to download content directly from storage of neighboring helpers via short range links. In this paper, we introduce a novel storage assignment scheme that can enhance storage utilization for D2D networks that have different types of storage nodes. Unlike traditional D2D systems that only use storage as static content cac...

Hybrid automatic repeat request (HARQ) is the well-known technique to improve the system throughput and link performance in wireless communication systems. It can also be applied together with the cooperative communication, which provides a new way of exploiting the spatial diversity. Firstly, we present the analytical framework of decodeand-forward (DF) relaying systems with the general hop-by...

Cooperative diversity has been proposed as an approach to improve the reliability of multihop networks in challenging environments where radio nodes may be disadvantaged due to shadowing. Nodes cooperate by relaying messages, which provides spatial and temporal diversity and may improve network performance in terms of latency and throughput rate. However, additional resources are required to ac...

Energy efficiency in multi-hop cooperative power line communication (PLC) systems has recently received considerable attention in the literature. In order to make such systems more energy-efficient, this paper proposes a relaying technique equipped with energy-harvesting capabilities. More specifically, we consider a dual-hop decode-and-forward (DF) broadband PLC relaying system in which the re...

Distance relaying techniques based on the measurement of impedance at the fundamental frequency between the fault location and the relaying point have attracted widespread attention. The sampled voltage and current data at the relaying point are used to classify the type of fault involving the line with or without fault resistance present in the fault path. The accuracy of the fault classificat...

Two way relaying is a promising technique to improve the performance of wireless networks because it dramatically enhances the spectral efficiency comparing to traditional one way relaying. This technique is flourished by seminal works [1] [2] [3] [4], which introduce different two-way relaying schemes. Generally, these schemes can be divided into two categories: three-step schemes and two-step...

The Gaussian parallel relay network, introduced by Schein and Gallager, consists of a concatenation of a Gaussian additive broadcast channel from a single encoder to a layer of relays followed by a Gaussian multiple-access channel from the relays to the final destination (decoder), where all noises are independent. This setup exhibits an inherent conflict between digital and analog relaying; wh...

To exploit multi-rate capability as well as improve performance in wireless local area networks (WLANs), many rate adaptation mechanisms are proposed on IEEE 802.11 media access control (MAC) layer. However, they lead to performance anomaly problem due to guarantee of throughput fairness. To solve this problem, many cooperative MAC protocols were proposed that are classified into packet aggrega...