This paper proposes a cooperative communication scheme for improving wireless communication performance. By the distance of between transmitter and receiver, the signal from the transmitter is distorted for various reasons such as inter-cell interference (ICI), power reduction, incorrect channel estimation. In order to solve problems, the proposed scheme uses the relay. By the relay, the commun...

This paper presents an outage performance of multiple access relay channel (MARC) for decode-and-forward (DF) relay and amplify-and-forward (AF) relay selection. We consider the multiple-access relay channel with two source nodes, one relay node and one destination node. In MARC, multiple sources transmit to a common destination simultaneously with the assistance of a single relay. In a relayin...

In this paper, we propose novel cooperative transmission protocols for delay limited coherent fading channels consisting of N (half-duplex and singleantenna) partners and one cell site. In our work, we differentiate between the relay, cooperative broadcast (down-link), and cooperative multiple-access (up-link) channels. The proposed protocols are evaluated using Zheng-Tse diversity-multiplexing...

Relay selection scheme in cooperative communication systems has been known as an effective technique that provides full diversity with efficient use of bandwidth in literature. Generally, the total power is shared equally between the source and the selected relay in relay selection schemes. However, the power allocation between the source and the selected relay is critical to further improve th...

In this article, we investigated the secrecy performance of a three-hop relay network system with Power Splitting (PS) and Energy Harvesting (EH). presence one eavesdropper, signal is transferred from source to destination help relay. The transmits in full-duplex (FD) mood, jamming transfer signals destination. employ Time Switching (TS) (EH) techniques obtain power beacon. study, compared Secr...

The performance of user cooperation that results when users forward packets for each other in a multiaccess network is compared to that of dedicated-relay cooperation which results from using a dedicated wireless relay when the users do not cooperate. Using the total transmit and processing power consumed at all nodes as a cost metric, the outage probabilities achieved by dynamic decode-and-for...

Cooperative communication is one of the latest techniques in wireless communication to form virtual antenna arrays. Cooperative communication is an alternative method for MIMO (Multiple input multiple output) system. This scheme assumes TDMA (Time division multiple access) channel accessing and divides the communication into two phases which includes direct transmission and retransmission by th...

In this paper, we study the performance of an amplify-and-forward (AF) based analog network coding (ANC) relay scheme in a multi-hop wireless network under individual power constraints. In the first part, a unicast scenario is considered. The problem of finding the maximum achievable rate is formulated as an optimization problem. Rather than solving this non-concave maximization problem, we der...

This is a companion technical report of the main manuscript “Semidefinite Relaxation and Approximation Analysis of a Beamformed Alamouti Scheme for Relay Beamforming Networks”. The report serves to give detailed derivations of Lemma 1-2 in the main manuscript, which are too long to be included in the latter. In addition, more simulation results are presented to verify the viability of the BF Al...

In this paper, the performance of four cooperative relaying schemes, which are classified by requiring a quantity of feedback information, is evaluated in the high SNR region and is compared with that of MIMO relaying schemes with two antennas. For amplify-and-forward (AF) relay, all schemes except the second hop selection scheme provide the second order diversity gain in high SNR region. For d...