Outage performance of underlay cognitive radio networks over mix fading environment

Performance of Fading Multi-user Diversity for Underlay Cognitive Networks

Having multiple secondary users (SUs) can be exploited to achieve multiuser diversity and improve the throughput of the underlay secondary network. In the cognitive setting, satisfying the interference constraint is essential, and thus, a scheduling scheme is considered where some SUs are preselected based on the low interference power. From this subset, the SU that yields the highest throughpu...

Outage Performance of Cognitive AF Relaying Networks over generalized η − μ Fading Channels

In this paper, a dual-hop cognitive amplify-and-forward (AF) relay network subject to independent nonidentically distributed (i.n.i.d.) η − μ fading channels is investigated. In the considered network, secondary users (SUs) including one secondary user source (SU-S) and one secondary user relay (SU-R) are allowed to share the same spectral resources with the primary user (PU) simultaneously und...

Outage probability over composite η - μ fading-shadowing radio channels

Performance Analysis of Ad Hoc Dispersed Spectrum Cognitive Radio Networks over Fading Channels

Cognitive radio systems can utilize dispersed spectrum, and thus such approach is known as dispersed spectrum cognitive radio systems. In this paper, we first provide the performance analysis of such systems over fading channels. We derive the average symbol error probability of dispersed spectrum cognitive radio systems for two cases, where the channel for each frequency diversity band experie...

Cognitive Radio II Multiple Systems Sensing for Cognitive Radio Networks over Rayleigh Fading Channel

For the CR systems sharing the spectrum with narrowband primary devices, this paper presents an OFDM system supporting the fractional bandwidth (FBW) mode to avoid the interference to or from the primary devices. For the system, the preamble and FBW mode detection algorithm are provided to obtain the FBW mode information during the initial synchronization. The simulation results reveal that the...