Graduate School and Research Center In communication systems

Degrees of freedom region of the MISO broadcast channel with general mixed-CSIT

Chen, Jinyuan; Elia, Petros

Arxiv:1205.3474v1, May 15th, 2012

In the setting of the two-user broadcast channel, recent work by Maddah-Ali and Tse has shown that knowledge of prior channel state information at the transmitter (CSIT) can be useful, even in the absence of any knowledge of current CSIT. Very recent work by Kobayashi et al., Yang et al., and Gou and Jafar, extended this to the case where, instead of no current CSIT knowledge, the transmitter has partial knowledge, and where under a symmetry assumption, the quality of this knowledge is identical for the different users’ channels. Motivated by the fact that in multiuser settings, the quality of CSIT feedback may vary across different links, we here generalize the above results to the natural setting where the current CSIT quality varies for different users’ channels. For this setting we derive the optimal degrees-of-freedom (DoF) region, and provide novel multi-phase broadcast schemes that achieve this optimal region. Finally this generalization incorporates and generalizes the corresponding result in Maleki et al. which considered the broadcast channel with one user having perfect CSIT and the other only having prior CSIT.

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Department:Mobile Communications
Eurecom ref:3714
Copyright: © EURECOM. Personal use of this material is permitted. The definitive version of this paper was published in Arxiv:1205.3474v1, May 15th, 2012 and is available at :
Bibtex: @article{EURECOM+3714, year = {2012}, month = {05}, title = {{D}egrees of freedom region of the {MISO} broadcast channel with general mixed-{CSIT}}, author = {{C}hen, {J}inyuan and {E}lia, {P}etros}, journal = {{A}rxiv:1205.3474v1, {M}ay 15th, 2012}, url = {http://www.eurecom.fr/publication/3714} }
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