Cyclic distributed space-time codes for wireless relay networks with no channel information

  • Authors:

  • Frédérique Oggier;Babak Hassibi

  • Affiliations:

  • School of Mathematical Sciences, Division of Physical and Mathematical Sciences, Nanyang Technological University, Singapore and Department of Electrical Engineering, California Institute of Techn ...;Department of Electrical Engineering, California Institute of Technology, Pasadena, CA

  • Venue:
  • IEEE Transactions on Information Theory
  • Year:
  • 2010

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Abstract

In this paper, we present a coding strategy for half duplex wireless relay networks, where we assume no channel knowledge at any of the transmitter, receiver, or relays. The coding scheme uses distributed space-time coding, that is, the relay nodes cooperate to encode the transmitted signal so that the receiver senses a space-time codeword. It is inspired by noncoherent differential techniques. The proposed strategy is available for any number of relays nodes. It is analyzed, and shown to yield a diversity linear in the number of relays. We also study the resistance of the scheme to relay node failures, and show that a network with R relay nodes and d of them down behaves, as far as diversity is concerned, as a network with R - d nodes. Finally, our construction can be easily generalized to the case where the transmitter and receiver nodes have several antennas.