DoF analysis of the K-user MISO broadcast channel with hybrid CSIT

Borzoo Rassouli, Chenxi Hao, Bruno Clercks

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

We consider a K-user multiple-input single-output (MISO) broadcast channel (BC) where the channel state information (CSI) of user i(i = 1, 2,⋯, K) may be either instantaneously perfect (P), delayed (D) or not known (N) at the transmitter with probabilities λP i, λD i and λN i, respectively. In this setting, according to the three possible CSIT for each user, knowledge of the joint CSIT of the K users could have at most 3K states. Although the results by Tandon et al. show that for the symmetric two user MISO BC (i.e., λQ i = λQ, ∀i ∈ {1, 2}, Q ∈ {P, D, N}), the Degrees of Freedom (DoF) region depends only on the marginal probabilities, we show that this interesting result does not hold in general when K ≥ 3. In other words, the DoF region is a function of all the joint probabilities. In this paper, given the marginal probabilities of CSIT, we derive an outer bound for the DoF region of the K-user MISO BC. Subsequently, we investigate the achievability of the outer bound in some scenarios. Finally, we show the dependence of the DoF region on the joint probabilities.

Original languageEnglish
Title of host publication2015 IEEE International Conference on Communications, ICC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4199-4204
Number of pages6
Volume2015-September
ISBN (Electronic)9781467364324
DOIs
Publication statusPublished - 2015 Sep 9
EventIEEE International Conference on Communications, ICC 2015 - London, United Kingdom
Duration: 2015 Jun 82015 Jun 12

Other

OtherIEEE International Conference on Communications, ICC 2015
CountryUnited Kingdom
CityLondon
Period15/6/815/6/12

    Fingerprint

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Cite this

Rassouli, B., Hao, C., & Clercks, B. (2015). DoF analysis of the K-user MISO broadcast channel with hybrid CSIT. In 2015 IEEE International Conference on Communications, ICC 2015 (Vol. 2015-September, pp. 4199-4204). [7248982] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICC.2015.7248982