Zero-Forcing Spatial Interweave with Greedy Scheduling

  • Authors:

  • Jarkko Kaleva;Petri Komulainen;Markku Juntti;Antti Tölli

  • Affiliations:

  • Centre for Wireless Communications, University of Oulu, University of Oulu, Finland 90014;Centre for Wireless Communications, University of Oulu, University of Oulu, Finland 90014;Centre for Wireless Communications, University of Oulu, University of Oulu, Finland 90014;Centre for Wireless Communications, University of Oulu, University of Oulu, Finland 90014

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2013

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Abstract

We propose a method that allows opportunistic shared channel utilization in multi-user multiple-input multiple-output systems, without causing any interference towards the primary system. It is shown that with appropriate exploitation of demodulation pilot signaling, the opportunistic system can quantify all the necessary information in order to guarantee complete interference mitigation towards the primary system. Opportunistic signal space utilization is based on the assumption of reciprocal zero-forcing transmitter and receiver design in the primary system and use of time division duplexing. Linear beamforming is coupled with greedy scheduling for efficient exploitation of multi-user diversity in both the primary system and the cognitive systems.