An artificial fast fading generation scheme for physical layer security of MIMO-OFDM systems

Recent advances on physical layer security for wireless communications

“…A so-called randomized beamforming scheme is introduced for improving secrecy capacity in the series of papers [4,[50][51][52][53] for the MISO and MISOME case, and later extended in [54] The signal, which is distorted by a random multiplicative factor, experiences an effect equivalent to fast fading, therefore this scheme was named artificial fast fading (AFF) in [55]. On the downside, this scheme is heavily dependent in the reliable estimation of the channel, and power efficiency is an intrinsic design problem.…”

“…The AFF scheme was analyzed in the frequency domain for MISOME-OFDM systems in [54] where they also introduce the MIMOME-OFDM case which is explained in the next section.…”

“…by Kozai and Saba in [54] where the model is described in the frequency domain. In extension of the previous scenario, the goal is to design a weighting matrix that produces the AFF effect at Eve and cancels out at BOB.…”

Scattering-based approaches for physical layer security

“…These efforts have addressed the important case of wireless channels as well as the more manageable wired communication channel case, the latter in connection with applications to power line communications (PLC) which make use of the available smart grid and other existing infrastructure. On the other hand, within the wireless regime, most existing work has focused on the canonical free-space case scenario [12][13][14][15], or -within mathematical, statistical information theoretic frameworks -on the classical random matrix models such as those for fading and other channels [16][17][18][19][20][21]. On the other hand, little attention has been given to the important case of unknown, complex, fixed or possibly slow-fading (block-fading) wireless channels, where little prior information is available other than that facilitated by the parties through explicit, cooperative communication.…”

“…A so-called randomized beamforming scheme is introduced for improving secrecy capacity in the series of papers [20,[66][67][68][69] for the MISO and MISOME case, and later extended in [17] The signal, which is distorted by a random multiplicative factor, experiences an effect equivalent to fast fading, therefore this scheme was named artificial fast fading (AFF) in [19]. On the downside, this scheme is heavily dependent in the reliable estimation of the channel, and power efficiency is an intrinsic design problem.…”