Optimal Antenna Selection for TCP Throughput Over Practical Distributed Cognitive Radio Networks

Abstract

In a cognitive radio networks (CRNs), the available idle spatial domain resource has to be considered to achieve a high spectral efficiency. In this paper, taking the constraint on the occupied time slot and frequency band into account, an antenna selection strategy for the maximized transport-layer throughput (AS-MTT) is proposed for secondary user (SU) using multiple-input multiple-output (MIMO) antenna arrays. The maximum achievable cross-layer transmit control protocol (TCP) throughput over practical distributed (PDCRNs) is formulated as an optimization objective. Considering the combination of physical-layer antenna selection, modulation, coding scheme, and data link layer frame size, the searching function for AS-MTT is modeled as max-min optimization problems. Numerical results show that the proposed AS-MTT strategy is capable to improve the SU’s TCP throughput.