Pyhyscial security is becoming a centre of focus in research for securing date transmission over wireless channels. One of the techniques is based on an Antenna subset modulation (ASM). ASM is of a low complexity single directional modulation. ASM is to modulate the radiated signal with a specified symbol rate using an array of switches along the radiation path. As a result of this kind of switching, the signal constellation in the targeted direction will not be distorted while a heavy distortion will affect the signal in the other undesired target directions and cause a random signal constellation in these directions. This research paper paper provides an intensive study of the performance of (ASM) in terms of probability of error and channel secrecy. A statistical model will be derived and their probability of symbol error rate when using different kind of data modulation. The simulation results of this paper show that ASM can be used efficiently for securing the multi-directional kind of transmission .
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