Computer Science – Information Theory
Scientific paper
2008-11-26
Computer Science
Information Theory
In Proceedings of Asilomar Conference on Signals, Systems, and Computers, Oct. 2008, Pacific Grove, CA
Scientific paper
Two distinct models of feedback, suited for FDD (Frequency Division Duplex) and TDD (Frequency Division Duplex) systems respectively, have been widely studied in the literature. In this paper, we compare these two models of feedback in terms of the diversity multiplexing tradeoff for varying amount of channel state information at the terminals. We find that, when all imperfections are accounted for, the maximum achievable diversity order in FDD systems matches the diversity order in TDD systems. TDD systems achieve better diversity order at higher multiplexing gains. In FDD systems, the maximum diversity order can be achieved with just a single bit of feedback. Additional bits of feedback (perfect or imperfect) do not affect the diversity order if the receiver does not know the channel state information.
Aggarwal Vaneet
Bhashyam Srikrishna
Krishna Gajanana
Sabharwal Ashutosh
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