Blind MIMO Cooperative Jamming: Secrecy via ISI Heterogeneity without CSIT

Jean De Dieu Mutangana, Ravi Tandon

Research output: Contribution to journalArticlepeer-review


We investigate the secure degrees of freedom (SDoF) of the multiple-input multiple-output (MIMO) wiretap channel with intersymbol interference (ISI) in the presence of a multi-antenna cooperative jammer. We focus on the practically relevant setting with no channel state information at the transmitters (CSIT). More specifically, the legitimate transmitter and the cooperative jammer only have statistical knowledge of the channel in terms of the effective number of ISI channel taps, i.e., channel impulse response (CIR) lengths, toward the legitimate receiver and the eavesdropper. Our main contribution is to show that in the absence of CSIT, positive SDoF can be achieved by carefully exploiting: 1) the heterogeneity of the CIR lengths toward both receivers and 2) the relative number of antennas at the four terminals. To achieve secrecy, we propose a scheme in which the transmitter strategically sends a mixture of information and artificial noise symbols in a way that exploits the heterogeneity of CIR lengths. Additionally, the cooperative jammer transmits artificial noise symbols in a way that completely masks all the information symbols that are received at the eavesdropping node. Under the proposed scheme, positive SDoF can be achieved, even when the number of antennas at the legitimate receiver is less than the number of antennas at the eavesdropper.

Original languageEnglish (US)
Article number8737786
Pages (from-to)447-461
Number of pages15
JournalIEEE Transactions on Information Forensics and Security
StatePublished - 2020


  • cooperative jammer
  • intersymbol interference (ISI) heterogeneity
  • MIMO wiretap channel
  • secure degrees of freedom (SDoF)
  • statistical channel state information (CSI)

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Computer Networks and Communications


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