Combined spectrum sensing and resource allocation for proficient transmission in ofdm based cognitive radio network with 5G

Abstract

In OFDM based Cognitive Radio Network with Cooperative Spectrum newlineSensing (CRN-CSS), resource allocation is critical due to introduction of interference newlineduring spectrum sensing and transmission. Presence of interference leads to newlineperformance degradation in data transmission in terms of transmission rate as well as newlinetransmission power. This research resolves this problem of interference through newlineproficient spectrum sensing and resource allocation to improve data transmission. newlineCRN-CSS network is integrated with 5G supported by MIMO equipped Fusion Center newline(FC) to handle massive number of users without loss in connectivity. OFDM based newlinedata transmission is adapted in CRN-CSS to achieve better transmission rate. In the newlineintegrated network, grouping process is initiated by Balanced K-means (BK-means) newlineclustering algorithm to preserve cooperativeness among Secondary Users (SUs). newlineDynamic slot allocation scheme namely Two-stage Multi-Slot Channel Assignment newline(TMSCA) method is proposed to avoid interference during spectrum sensing. Sensing newlineerrors are minimized with the assist of Energy Spectral Density based Energy newlineDetection (ESD-ED) spectrum sensing method. For global decision making, Channel newlineState Weighted Graph (CSWG) scheme is introduced in which Spectrum Agent (SA) newlineplays a vital role. Finally, resource allocation is carried out by fusion center by newlineutilizing Efficient Karush-Kuhn-Tucker (EKKT) condition in accordance with power, newlinechannel state, and interference constraints. Through EKKT method spectrum and newlinetransmission power are allocated to SUs together in such a way interference with newlinePrimary User (PU) is avoided. Minimizing interference in spectrum sensing and data newlinetransmission improves the network throughput. Meanwhile, OFDM based newlinetransmission with QPSK modulation scheme reduces Peak-to-Average-Power Ratio newline(PAPR) leads to high transmission rate. The proposed OFDM based CRN-CSS with newline5G network is extensively simulated in network simulator-3.26 simulation tool. newlineExtensive simulation result shows 80% of throughput is achieved by