Title:
Multi-User-Diversity-vs.-Accurate-Channel-State-I
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Description: In a multiple transmit antenna, single antenna per receiver downlink channel with limited channel state feedback, we consider the following question: given a constraint on the total system-wide feedback load, is it referable to get low-rate/coarse channel feedback from a large number of receivers or high-rate/high-quality feedback from a smaller number of receivers? Acquiring feedback from many receivers allows multi-user diversity to be exploited, while high-rate feedback allows
for very precise selection of beamforming directions. We show that there is a strong preference for obtaining high-quality feedback, and that obtaining near-perfect channel information from as many receivers as possible provides a significantly larger sum rate than collecting a few feedback bits from a large number of users.
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Multi-User Diversity vs. Accurate Channel State Information in MIMO Downlink Channels
.....................................................................................\1
.....................................................................................\.\compute_pu2rc_rate.m
.....................................................................................\.\compute_ZF_rate.m
.....................................................................................\.\mud_vs_csi.m
.....................................................................................\.\mud_vs_csi_demo.m
.....................................................................................\.\quantiz_channels.m
.....................................................................................\.\user_selection_ZF_greedy.m
.....................................................................................\dimacs_duality.pdf
.....................................................................................\jindal_thesis.pdf
.....................................................................................\mud_vs_quant_journal.pdf
