  As developments of electromagnetic weapons, Electronic Warfare (EW) has been
rising as the future form of war. Especially in wireless communications, the
high security defense systems, such as Low Probability of Detection (LPD), Low
Probability of Interception (LPI), or Low Prob-ability of Exploitation (LPE)
communication algorithms, are studied to prevent the military force loss. One
of the LPD, LPI, and LPE communication algorithm, physical-layer security, has
been discussed and studied. We propose a noise signaling system, a type of
physical-layer secu-rity, which modifies conventionally modulated I/Q data into
a noise-like shape. For presenting the possibility of realistic implementation,
we use Software-Defined Radio (SDR). Since there are certain limitations of
hardware, we present the limitations, requirements, and preferences of
practical implementation of noise signaling system, and the proposed system is
ring-shaped signaling. We present the ring-shaped signaling system algorithm,
SDR implementation meth-odology, and performance evaluations of the system by
the metrics of Bit Error Rate (BER) and Probability of Modulation
Identification (PMI), which we obtain by Convolutional Neural Net-work (CNN)
algorithm. We conclude that the ring-shaped signaling system can perform a high
LPI/LPE communication function due to the eavesdropper cannot obtain the
correct used modu-lation scheme information, and the performance can vary by
the configurations of the I/Q data modifying factors.
