Secure Transmission via Constellation Splitting

To enhance the security of wireless communications, we propose a constellation splitting-based friendly jamming scheme in this letter. The scheme splits the real and imaginary (or the in-phase and quadrature) components of a complex signal, using the real part to convey private information while embedding artificial noise into the imaginary part. Upon receiving the signal, the legitimate receiver can separate the real and imaginary components to extract the private information, while the eavesdropper’s signal remains obscured by the artificial noise. We analyze the bit error rate (BER) of the proposed scheme, with results showing that the eavesdropper’s BER remains at a high level.