TY - GEN
T1 - Physical layer secrecy for OFDM systems
AU - Renna, Francesco
AU - Laurenti, Nicola
AU - Poor, H. Vincent
PY - 2010
Y1 - 2010
N2 - Orthogonal frequency division multiplexing (OFDM) has been established as the preferred modulation choice for highrate data transmission over dispersive channels, as it allows rejection of inter-symbol interference (ISI) and efficient utilization of the available spectrum. We address the issues of determining achievable secrecy rates and secrecy capacity for OFDM transmission in the presence of a generic eavesdropper. In doing so, we refrain from making the restrictive assumption made in previous works that the eavesdropper uses a standard fast Fourier transform (FFT)-based demodulator. First, the high SNR secrecy capacity under a total input power constraint is evaluated for both cyclic prefix and zero-padding suffix OFDM systems. It is shown that in both cases the result is sensibly lower than what we would get if the eavesdropper used an OFDM receiver. Then, optimal power allocation schemes are proposed for both types of OFDM systems and the secrecy rates are compared with results obtained by using existing power allocation methods described in the literature for parallel Gaussian wiretap channels and multiple-input multiple-output (MIMO) Gaussian wiretap channels.
AB - Orthogonal frequency division multiplexing (OFDM) has been established as the preferred modulation choice for highrate data transmission over dispersive channels, as it allows rejection of inter-symbol interference (ISI) and efficient utilization of the available spectrum. We address the issues of determining achievable secrecy rates and secrecy capacity for OFDM transmission in the presence of a generic eavesdropper. In doing so, we refrain from making the restrictive assumption made in previous works that the eavesdropper uses a standard fast Fourier transform (FFT)-based demodulator. First, the high SNR secrecy capacity under a total input power constraint is evaluated for both cyclic prefix and zero-padding suffix OFDM systems. It is shown that in both cases the result is sensibly lower than what we would get if the eavesdropper used an OFDM receiver. Then, optimal power allocation schemes are proposed for both types of OFDM systems and the secrecy rates are compared with results obtained by using existing power allocation methods described in the literature for parallel Gaussian wiretap channels and multiple-input multiple-output (MIMO) Gaussian wiretap channels.
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U2 - 10.1109/EW.2010.5483477
DO - 10.1109/EW.2010.5483477
M3 - Conference contribution
AN - SCOPUS:77954445877
SN - 9781424459995
T3 - 2010 European Wireless Conference, EW 2010
SP - 782
EP - 789
BT - 2010 European Wireless Conference, EW 2010
T2 - 2010 European Wireless Conference, EW 2010
Y2 - 12 April 2010 through 15 April 2010
ER -