ISBN: 978-981-11-3671-9 DOI: 10.18178/wcse.2017.06.139
Constant Envelope FrFT- OFDM with Physical Layer Security
Abstract— Physical layer security uses channel characteristics to increases security of the communicating
entities. In this paper, channel signature were used to improve the security of wireless communications uses
constant envelope with fractional Fourier transform OFDM (CE-FrFT-OFDM) as its multiplexing technique
instead of traditional OFDM. The chosen technique is power efficient and poses the same implementation
complexity and performance as traditional OFDM. The physical layer security proposed is easily deployed in
CE-FrFT-OFDM than in OFDM and maintains its performance advantages. The proposed system secure a
communication system by dynamic arrangement of subcarriers (DAS) based on the average channel gain of the
subcarriers. The random variation of the wireless channel and its reciprocity between the transmitter and the
legal receiver ensures that the communicating entities shares the same channel impulse response (CIR). The
DAS also reduces the signal correlation between the communication pairs 40% while that of transmittereavesdropper
is reduced by 95% and it increases the computation cost of the eavesdropper in obtaining the
transmitted information which leaves guessing of the channel gain the only viable choice of obtaining the
transmitted information. By increasing the accepted lever of a channel gain we can increase the secrete capacity
of the communication system while maintaining CE-FrFT-OFDM advantages.
Index Terms— Physical Layer security, dynamic arrangement of subcarriers (DAS), Fractional Fourier Transform (FrFT), FrFT-OFDM, and Constant Envelope.
Dida Mussa A, Hao Huan, Wang Teng, Ran Tao
Department of Electronic Engineering, Beijing Institute of Technology, CHINA
Cite: Dida Mussa A, Hao Huan, Wang Teng, Ran Tao, "Constant Envelope FrFT- OFDM with Physical Layer Security," Proceedings of 2017 the 7th International Workshop on Computer Science and Engineering, pp. 794-799, Beijing, 25-27 June, 2017.