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On the degrees-of-freedom of the 3-user MISO broadcast channel with hybrid CSIT (2014)
| Venue: | In IEEE ISIT |
| Citations: | 3 - 0 self |
BibTeX
@INPROCEEDINGS{Amuru14onthe,
author = {Saidhiraj Amuru and Ravi Tandon and Shlomo Shamai (shitz},
title = {On the degrees-of-freedom of the 3-user MISO broadcast channel with hybrid CSIT},
booktitle = {In IEEE ISIT},
year = {2014}
}
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Abstract
Abstract—The 3-user multiple-input single-output (MISO) broadcast channel (BC) with hybrid channel state information at the transmitter (CSIT) is considered. In this framework, there is perfect and instantaneous CSIT from a subset of users and delayed CSIT from the remaining users. We present new results on the degrees of freedom (DoF) of the 3-user MISO BC with hybrid CSIT. In particular, for the case of 2 transmit antennas, we show that with perfect CSIT from one user and delayed CSIT from the remaining two users, the optimal DoF is 5/3. For the case of 3 transmit antennas and the same hybrid CSIT setting, it is shown that a higher DoF of 9/5 is achievable and this result improves upon the best known bound. Furthermore, with 3 transmit antennas, and the hybrid CSIT setting in which there is perfect CSIT from two users and delayed CSIT from the third one, a novel scheme is presented which achieves 9/4 DoF. Our results also reveal new insights on how to utilize hybrid channel knowledge for multi-user scenarios. I.
