In this paper, we study virtual full-duplex (FD) buffer-aided relaying to recover the multiplexing loss of halfduplex (HD) relaying in a network with multiple buffer-aided relays, each of which has multiple antennas, through opportunistic relay selection and beamforming. The main idea of virtual FD buffer-aided relaying is that a source and a relay simultaneously transmit their own information ...

A two-dimensional Channel Probability Space (CPS) based on the source-relay and relay-destination channel. In this paper, a non-linear CPS division method is used a single relay and the RN is competent for the moment storing the received packets. Extensively, a non-linear CPS method, which partitions the CPS into more than a few regions representing the quality of the specific channels plus an ...

the present study on politeness is an attempt to examine (dis)agreeing strategies utilized by efl learners while chatting on the internet. subjects of the study were forty male and thirty-three female iranian natives whose internet relay chat (irc) interactions, composed of 400 excerpts, were collected between december 2007 and september 2008. data analysis was based on the general taxonomy of ...

In this paper, we consider a two-way multiple input multiple output (MIMO) Amplify-and-Forward (AF) relay system, where interference is observed at the relay node during the multiple access (MAC) phase. For such a scenario, two new joint source-relay precoding algorithms with interference suppression are proposed and their performance analyzed through simulation results. These linear minimum me...

In wireless media, secure communication is one of the important concepts. We use Identity based cryptosystems in order to provide security in two-way relay networks. But due to the use of identity of a node as their public key, this scheme lacks the anonymity and privacy preservation. So, in order to solve this problem, propose a new approach in two-way relay networks by using cooperation jammi...

This paper extends the amplify-and-forward based wireless network coding (AFNC) for single-relay network to multi-relay network with a chain topology. Direct application of the relaying protocol utilized in the conventional single-relay AFNC to the multi-relay scenario causes two major problems: the phenomenon of back stream of data, which we call data reflection, and inter-hop interference. We...

In this paper, Hybrid relay systems are comprised of Amplify-andForward (AF), Decode-and-Forward (DF) and DeModulate-and-Forward (DMF) together in cooperative networks. We propose adaptive relay schemes based on Channel State Information (CSI) of the received Signal-to-Noise Ratio (SNR) at the Relay Node (RN). We select the relay protocol adaptively, on the basis of Power Allocation (PA) constr...

This paper introduces a simple combining technique for cooperative relay scheme which is based on a Detect-and-Forward (DEF) relay protocol. Cooperative relay schemes have been introduced in earlier works but most of them ignore the quality of the source-relay (S-R) channel in the detection at the destination, although this channel can contribute heavily to the performance of cooperation scheme...

There has been much recent attention on using wireless relay networks to forward data from mobile nodes to a base station. This network architecture is motivated by performance improvements obtained by leveraging the highest quality links to a base station for data transfer. With the advent of agile radios it is possible to improve the performance of relay networks through intelligent frequency...

In this paper, the multi-user multiple-input multipleoutput (MU-MIMO) relay channel is investigated, where the source node provides multi-beams to multi-users via a multi-antenna relay node. In this scenario, linear processing matrix at the relay node is designed around block diagonal (BD) scheme to improve the system sum-rate. Compared with the traditional linear processing matrix with zero-fo...