Degrees of freedom of multiple broadcast channels in the presence of inter-cell interference

Seok Hwan Park, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


In this paper, we provide lower and upper bounds for the number of degree of freedom (DOF) of B multiple-input single-output (MISO) broadcast channels (BC) where each base station (BS) equipped with M antennas supports its corresponding K single antenna users suffering from inter-cell interference. The sufficient and neccessary condition for tightness of two bounds is presented. From the derived result, it can be observed that in-cell receiver cooperation does not help in most of the cases in a multiple-input multiple-output (MIMO) interference channel (IFC) except for one special case. Even for that special case, the DOFs with and without in-cell receive cooperation approach the same value for large K. Also, in a MIMO IFC with symmetric antenna settings (i.e., M = K), if both transmit and receive cooperations are removed to make it a single-input single-output (SISO) IFC, we show that the DOF is not affected. In addition, the DOF is studied for two mutually interfering broadcast channels in the presence of a cognitive BS. We obtain an interesting result that disabling in-cell receive cooperation of the MIMO IFC causes no DOF loss if at least one of two transmitters is a cognitive BS.

Original languageEnglish
Article number5739160
Pages (from-to)1481-1487
Number of pages7
JournalIEEE Transactions on Communications
Issue number5
Publication statusPublished - 2011 May


  • Interference mitigation
  • degrees of freedom
  • multi-cell

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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