Next generation system of MIMO technology is required to construct the wireless communication infrastructure. Recently one approach is to use relay network [1]. The relaying system is divided into regenerative and nonregenerative system. The main difference between them is the state of noise. The behaviour of regenerative relaying system is removing noise from the receiving signal and decode. I...

Cooperative communication is a novel class of wireless communication technique which wireless nodes help each other relay information to the intended destination. Orthogonal frequency division multiplexing (OFDM) has become a popular technique for the high data rate and performance. The integration of OFDM and cooperative communication in next generation wireless leads to the design of an effic...

Spatial diversity is an inherent nature of wireless communications. This nature can be exploited to make communications more reliable by Multiple-Input-Multiple-Output (MIMO). However the use of multiple co-located antennas is constrained by the dimensions of modern devices. To overcome this drawback cooperative relaying shares antennas between different network nodes thus realizing a Virtual a...

The previous schemes are introduced, including traditional network coding (NC) scheme, physical-layer network coding (PNC) scheme, soft network coding (SNC) scheme and pseudo physical-layer network coding (PPNC) scheme. As an improved scheme of PNC, PPNC does not need synchronization mechanism, however its BER performance gets worse due to the hard decision applied on the relay node. The new pr...

In this article, an orthogonal projection signal alignment (OP-SI) scheme is proposed for multiple-input and multiple-output (MIMO) relay systems, and the user performance is studied with and without perfect channel state information (CSI). Particularly we focus on an important scenario in cellular systems, where the base station exchanges messages with multiple users via a relay. By jointly de...

In this article, we study the optimal structure of the source precoding matrix and the relay amplifying matrices for multiple-input multiple-output (MIMO) relay communication systems with parallel relay nodes. Two types of receivers are considered at the destination node: (1) The linear minimal mean-squared error (MMSE) receiver; (2) The nonlinear decision feedback equalizer based on the minima...

This paper investigates the degrees of freedom (DoF) of the L-cluster, K-user MIMO multi-way relay channel, where users in each cluster wish to exchange messages within the cluster, and they can only communicate through the relay. A novel DoF upper bound is derived by providing users with carefully designed genie information. Achievable DoF is identified using signal space alignment and multipl...

In this paper, in order to attain the maximum ergodic capacity and significantly increase spectral efficiency of wireless communication systems, novel linear beamforming is proposed for dual-hop amplify-and-forward (AF) multi-relay networks. The designed based on maximization signal-to-interference-plus-noise ratio (SINR) signal-to- leakage-and-noise (SLNR). channel state information (CSI) used...

This paper presents a low-density parity check(LDPC) coded multiple-input multipleoutput(MIMO) cooperative communication system with relay selection strategy. In the proposed cooperative network with multiple potential relays, we present selection cooperation to choose the best relay. We also present the outage probability analysis of this system. Furthermore, in the proposed architecture relay...