Physical layer security for MIMOME-OFDM systems: Spatial versus temporal artificial noise

Ahmed El Shafie, Zhiguo Ding, Naofal Al-Dhahir

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


In this chapter, we consider a general scenario with a hybrid time and spatial AN-injection scheme. In particular, we consider the MIMOME-OFDM wiretap channel, where each node is equipped with multiple antennas and the legitimate transmitter (Alice) has perfect knowledge of the CSI for the wireless links to her legitimate receiver (Bob) only, while the eavesdropper (Eve) has perfect CSI knowledge of all the links in the network. This global CSI assumption at Eve represents the best case scenario for Eve (the worst case scenario for Alice/Bob) since she knows all the channels between Alice and Bob as well as the used data and AN precoders at Alice. We exploit the spatial and temporal degrees of freedom provided by the available antennas and by the cyclic prefix (CP) structure of OFDM blocks, respectively, to confuse Eve and, hence, increase the secrecy rate of the legitimate system.

Original languageBritish English
Title of host publicationTrusted Communications with Physical Layer Security for 5G and Beyond
PublisherInstitution of Engineering and Technology
Number of pages30
ISBN (Electronic)9781785612350
StatePublished - 1 Jan 2017


  • Antenna arrays
  • CP structure
  • Cyclic prefix structure
  • Fading channels
  • Fading MIMO channel
  • Global CSI assumption
  • Hybrid spatial AN-injection scheme
  • Hybrid time AN-injection scheme
  • Legitimate receiver
  • Legitimate transmitter
  • MIMO communication
  • MIMOME-OFDM systems
  • MIMOME-OFDM wiretap channel
  • Multiple antennas
  • OFDM blocks
  • Ofdm modulation
  • Physical layer security
  • Radio receivers
  • Radio transmitters
  • Secrecy rate
  • Spatial artificial noise
  • Spatial degrees-of-freedom
  • Telecommunication security
  • Temporal artificial noise
  • Temporal degrees-of-freedom
  • Wireless links


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