Cross-layer routing and optimal radio resource allocation in OFDMA-based cognitive radio ad-hoc networks: spectrum sensing strategy

In this paper, we propose a cross-layer routing and radio resource allocation in an orthogonal frequency-division multiple access-based wireless cognitive radio ad hoc networks, where the availability of local spectrum resources may change instantaneously. The main objective is to determine sensing time, the data routes, subcarrier schedules and power allocations that maximize throughput of the data communicated subject to the transmission power, interference, routing and capacity constraints. We propose an iterative algorithm that optimises the subcarrier allocation and the power allocation alternatively routing in spectrum sensing based cognitive radio ad hoc networks. Finally, we provide simulation results to show the performance of the proposed algorithms and validate our theoretical analysis. Copyright (c) 2015 John Wiley & Sons, Ltd.