Performance Analysis of Secondary Link with Cross-Layer Design and Cooperative Relay in Cognitive Radio Networks

摘要

In this thesis, we investigate two different system infrastructures in underlay cognitiveradio network, in which two popular techniques, cross-layer design and cooperativecommunication, are considered, respectively. In particular, we introduce the AggressiveAdaptive Modulation and Coding (A-AMC) into the cross-layer design andachieve the optimal boundary points in closed form to choose the AMC and A-AMCtransmission modes by taking into account the Channel State Information (CSI) fromthe secondary transmitter to both the primary receiver and the secondary receiver.What’s more, for the cooperative communication design, we consider three differentrelay selection schemes: Partial Relay Selection, Opportunistic Relay Selection andThreshold Relay Selection. The Probability Density Functions (PDFs) of the Signal-to-Noise Ratio (SNR) in each hop for different selection schemes are provided, andthen the exact closed-form expressions for the end-to-end packet loss rate in the secondarylink considering the cooperation of the Decode-and-Forward (DF) relay fordifferent relay selection schemes are derived.