Information Security of PHY Layer in Wireless Networks

Table 1

Comparison of PHY layer’s security technique in wireless networks.

Secure technique	Type	Technical characteristics	Ability to defend against eavesdropping attacks	Ability to defend against jamming attacks	Ability to defend against interference attacks	Complexity
Directional antenna	Spatial domain	Increased receive gain in particular direction of space	Low	Medium	Low	Low
Beamforming		Superimposed multiantenna signal	Medium	—	Low	High
Random antennas		Increased channel randomness	Higher	—	—	High
Artificial noise		Increased channel diversity	High	—	—	High
Random parameters	—	Increased signal randomness	Higher	—	—	High
FHSS	Frequency domain	Fast hopping of carrier frequency	Higher	High	—	Medium
DSSS		Increased bandwidth	—	Higher	Medium	Medium
Channel coding	Time domain	Powerful error correction capability	—	—	High	Low