Degrees of freedom of SIMO X channel

X Wang, L Xiao, Y Zhao, X Xu, J Wang - IET Communications, 2013 - Wiley Online Library
X Wang, L Xiao, Y Zhao, X Xu, J Wang
IET Communications, 2013Wiley Online Library
In this study, the authors mainly study the degrees of freedom (DoFs) of M× N user single
input multiple output (SIMO)(or multiple input single output (MISO)) X channels, in which the
channel coefficients are drawn from a continuous distribution and data‐sharing among
users are unavailable. First, the authors establish an outer bound of DoFs for multiple‐in
multiple‐out (MIMO) X channel, which is tighter than those in previous work. For SIMO X
channel with R antennas at each user, the authors prove that the DoFs is [MNR/(M+ NR …
In this study, the authors mainly study the degrees of freedom (DoFs) of M × N user single input multiple output (SIMO) (or multiple input single output (MISO)) X channels, in which the channel coefficients are drawn from a continuous distribution and data‐sharing among users are unavailable. First, the authors establish an outer bound of DoFs for multiple‐in multiple‐out (MIMO) X channel, which is tighter than those in previous work. For SIMO X channel with R antennas at each user, the authors prove that the DoFs is [MNR/(M + NRR)], which is achieved by symbol extension and interference alignment. As the transmitters and receivers are interchangeable in the network considered, the authors obtain corresponding results for MISO X channel. Finally, the authors generalise our result to MIMO X channel with R antennas at each user, and show that its DoFs is [MNR/(M + N − 1)].
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