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...

In this paper, we propose a simple relaying protocol, namely clip-amplify-forward (CAF), for dual-hop transmissions. In the CAF relaying protocol, the received signal at the relay node is clipped firstly and then amplified with a fixed amplification gain before retransmission. Only a hard clipper and a linear amplifier are needed at the relay node, where no channel estimation is needed. Simulat...

Relaying is one of the useful techniques to enhance wireless physical-layer security. Existing literature shows that employing full-duplex relay instead of conventional half-duplex relay improves secrecy capacity and secrecy outage probability, but this is at the price of sophisticated implementation. As an alternative, two-path successive relaying has been proposed to emulate operation of full...

 We consider a TDMA cellular multihop network where relaying – via wireless terminals that have a good communication link to the base station – is used as a coverage enhancement technique. Provided that the subscriber density is not very low, relaying vi a wireless terminals can have a significant impact on coverage, capacity, and throughput. This is mainly due to the fact that the signals onl...

We consider various relaying strategies for wireless networks by comparatively examining direct transmission, conventional relaying, and the novel concepts of cooperative relaying. The latter build on two inherent benefits of relaying systems: the spatial diversity offered by the relay channel, and the ability to exploit the broadcast nature of the wireless medium. Studied cooperative protocols...

We use stochastic geometry to analyze the performance of a partial decode-and-forward (PDF) relaying scheme applied in a user-assisted relaying setting, where an active user relays data through another idle user in uplink cellular communication. We present the geometric model of a network deploying user-assisted relaying and propose two geometric cooperation policies for fast and slow fading ch...

Relaying is one of the proposed technologies for LTE-Advanced networks. In order to enable a flexible and reliable relaying support, the currently adopted architectural structure of LTE networks has to be modified. In this paper, we extend the LTE architecture to enable dynamic relaying, while maintaining backward compatibility with LTE Release 8 user equipments, and without limiting the flexib...

In this paper, we validate the availability of direct path in half-duplex-based cooperative relay networks from a practical point of view. Cooperative relaying is a low-complexity technique, which schedules orthogonal transmissions through the divided time slots. By doing so, transmission impairments due to multi-path fading and path loss are mitigated by obtaining a diversity gain. In conventi...

Half-duplex constraint refers to the inability of a radio to transmit and receive signals simultaneously due to the hardware limitation. In cooperative communication, half duplex constraint requires orthogonal time or frequency channel use between source transmission phase and relay transmission phase. This limits the spectral efficiency of conventional relaying to half of the performance of di...

A primitive relay channel (PRC) has one source(S) communicating a message to one destination (D) with thehelp of a relay (R). The link between R and D is consideredto be noiseless, of finite capacity, and parallel to the linkbetween S and (R,D). Prior work has established, for any fixednumber of channel uses, the minimal R-D link rate needed sothat the overall S-D messag...