The security gap of a wireless network composed of two legitimate nodes and one eavesdropper, all provided with multiple antennas, is evaluated. The use of transmit antenna selection combined with frame scrambling may lead to gaps <0 dB, under feasible scrambling depths and a practical number of transmit antennas is shown.
We evaluate the outage probability and the energy efficiency (EE) of a network composed of multiple sources, multiple relays and a single common destination, all of them provided with multiple antennas. More specifically, we resort to the network-coded cooperative (NCC) technique with multiple relay selection (MRS) and compare the EE of the network when operating under two combining techniques at the receiver, namely selection combining (SC) and maximum ratio combining (MRC). Our analysis, which adopts a realistic energy consumption model that encompasses the circuitry consumption, shows that MRC, which is optimal from the reliability perspective, may be outperformed by SC in terms of EE. Moreover, we also provide some insights about the number of relays that must be selected to maximize the EE. Finally, numerical results are presented and confirm the mathematical analysis. INDEX TERMS Cooperative communications, energy efficiency, mimo, network coding.
In this work, we consider a network composed of two legitimate nodes and one passive eavesdropper, all of them provided with multiple antennas. We also consider the transmit antenna selection (TAS) scheme along with frame scrambling at the transmitter to provide an instantaneous advantage for the legitimate users over the eavesdropper, while both legitimate and malicious receivers operate under maximum ratio combining (MRC). By considering a quasi-static fading scenario, we evaluate (analytically and through numerical results) the physical layer security through the security gap in terms of both outage probability and convolutional coding-based frame error rate (FER), as a function of the number of antennas at each node. Our results show that, either adopting the FER or the outage probability as the performance metric, it is possible to achieve negative security gaps using a feasible number of antennas.
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