This thesis deals with wireless channels in uncorrelated block fading environment with Rayleigh distribution. All nodes are assumed to be oblivious to their forward channel gains; however, they have perfect information about their backward channel gains. We also assume a stringent decoding delay constraint of one fading block that makes the definition of ergodic (Shannon) capacity meaningless. ...

Relay Selection and Resource Allocation in One-Way and Two-Way Cognitive Relay Networks Ahmad Mustafa Alsharoa In this work, the problem of relay selection and resource power allocation in oneway and two-way cognitive relay networks using half duplex channels with di↵erent relaying protocols is investigated. Optimization problems for both single and multiple relay selection that maximize the su...

AbstractHardware constraints have been seen in transceivers which create buckle thus degrading the communication system performance. In this work we have presented the impact of hardware faults on the Bi-hop relaying system for amplify and forward (AAF) and decode and forward (DAF) protocols in wireless system. Also Signal to noise distortion ratio is computed which is a function of probability...

Utilizing relaying techniques to improve performance of wireless systems is a promising avenue. However, it is crucial to understand what type of relaying schemes should be used for achieving different performance objectives under realistic fading conditions. In this paper, we present a general framework for modelling and evaluating the performance of relaying schemes based on the decode-and-fo...

In this paper, a new two-way relaying scheme based on compute-and-forward (CMF) framework and relay selection strategies is proposed, which provides a higher throughput than the conventional two-way relaying schemes. Two cases of relays with or without feedback transmission capability are considered. An upper bound on the computation rate of each relay is derived, and based on that, a lower bou...

We consider a two-way half-duplex relaying system where multiple pairs of single antenna users exchange information assisted by a multi-antenna relay. Taking into account the practical constraint of imperfect channel estimation, we study the achievable sum spectral efficiency of the amplify-and-forward (AF) and decode-and-forward (DF) protocols, assuming that the relay employs simple maximum ra...

This deliverable summarizes the final contributions on relaying and coverage extension. In the first part, several results of D7.1 are extended. In particular, the channel frequency selectivity is taken into account and solutions are investigated to cope with it in multi-hop relaying networks as well as in two-way relaying schemes. In the latter case, joint channel and physical layer network de...

The compute-and-forward (CMF) relaying technique, proposed by Nazer et al., provides a substantially higher network coding throughput in multiuser cooperative networks, compared to the other conventional relaying techniques. The improvement is due to exploiting the multiuser interference rather than avoiding it. However, a major drawback of this strategy is that the equations decoded by differe...

Intelligent reflecting surface (IRS) has emerged as a promising and low-cost technology for improving wireless communications by collecting dispersed radio waves redirecting them to the intended receivers. In this letter, we characterize achievable rate when multiple IRSs are utilized in manner of decode-and-forward (DF) relaying. Our performance analysis is based on Nakagami- <inline-formula x...