Effective Scrambling Scheme for Physical Layer Security

Scrambling is a practical scheme in the physical layer to increase the information security of wireless communication systems. However, the complexity of the conventional scrambling scheme O(n2)affects its practical application for long information size, where n is the information size. In this paper, we propose an effective scrambling scheme for the additive white Gaussian noise (AWGN) wiretap channel and investigate how the complexity and security gap can be reduced by our scheme. We compare our proposed scrambling scheme with the conventional random scrambling scheme and the results show that our scheme achieves a smaller security gap. Moreover, we demonstrate that by introducing proposed scrambling scheme can achieve lower complexity compared with the random scrambling scheme.