In this paper, we propose a cognitive transmission scheme with the best relay selection in a multiple-relay cognitive radio network to improve the secondary transmission performance while guaranteeing the quality-of-service (QoS) of the primary transmissions. We derive the closed-form expression of outage probability for the secondary transmissions, called Secondary outage probability, with the...

In this paper, we investigate the outage probability and power allocation for the two-way decode-andforward (DF) relay networks with relay selection. Specially, we consider independent but not necessarily identical distributed Rayleigh fading channels. Firstly, we derive an exact closed form outage probability expression. To shed light on the relation between the outage probability and the powe...

In this paper, the performance of a two-way relay network is analyzed when there are multiple interferers. We derive the outage probability of the two-way relay network with multiple interferers. It is shown that analytical results perfectly match simulation results of the outage probability. It is also shown that the outage probability increases as the number of interferers increases. Index te...

Abstract: In this paper we study the outage probability that is the complement of transmission success probability to be the probability of the SINR received by a typical receiver is more than a specified threshold in wireless ad hoc networks. Even though calculating the exact outage probability is usually impossible but considering special distributions for node distributions in wireless netwo...

The outage probability of reverse link multicarrier (MC) code-division multiple access (CDMA) systems with beamforming in the presence of carrier frequency offset (CFO) is studied. A conventional uniform linear array (ULA) beamformer is utilized. An independent Nakagami fading channel is assumed for each subcarrier of all users. The outage probability is first investigated under a scenario wher...

In this paper, the underlay cognitive relay network over double Rayleigh fading channels is investigated. For this network, we consider two cases: limited power case and unlimited power case. In the limited power case, the power of secondary user is constrained. On the other hand, the power of secondary user is not constrained in the unlimited power case. We derive the exact and approximate out...

We consider the slow-fading two-user multiple-input single-output (MISO) interference channel (IC), where the receivers treat the interference as additive Gaussian noise. We study the rate points that can be achieved, allowing a non-zero outage probability. The points which meet the outage probability specification constitute a so-called outage rate region. There exist several definitions of th...

In this work, cooperative spectrum sensing technology is applied to optimize the outage probability of cognitive relay networks. The outage performance optimization problem of cognitive relay networks is resolved by designing the sensing time and fusion rule threshold appropriately. The outage probability by high signal to noise ratio (SNR) approximation under Rayleigh fading channels is derive...