DEVELOPMENT OF AN IMPROVED ERGODIC CAPACITY OF UNDERLAY COGNITIVE RADIO WITH IMPERFECT CHANNEL STATE INFORMATION

📄 Project Abstract

This research work presentsthedevelopment of an improved ergodic capacity of underlay Cognitive Radio (CR) with imperfect Channel State Information(CSI). An underlay CR network under a Peak Interference Power (PIP) constraint imposed by a Primary User (PU) was considered.Aclosed formergodic capacity expression of the Secondary User (SU)under PIP constraintwas derivedin order to determine the ergodic capacity under different fading types using Nakagami-m distributions.The m-parameter of the Nakagami-m fading channel measures the ratio of the Line-of-Sight (LoS) signal power to that of the multipath component. The improved ergodic capacity expression developed was validated with the existing ergodic capacity expression at m=1. The results showed that the ergodic capacity of the SU could be extended to different fading types in the CR path by adjusting the m-parameter.The impact of channel estimation errors, 2 and channelcorrelation coefficient, on the SUergodic capacity was studiedunde...