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On FiniteSNR DMT of Noncoherent SIMOMRC
Nandita LAVANIS Devendra JALIHAL
Publication
IEICE TRANSACTIONS on Communications
Vol.E97B
No.5
pp.10801086 Publication Date: 2014/05/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E97.B.1080
Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: diversity multiplexing tradeoff, finiteSNR, MIMO system, noncoherent channel, channel estimation,
Full Text: PDF>>
Summary:
In this paper, the diversity multiplexing tradeoff (DMT) analysis of the noncoherent blockfading multiple antenna channel which uses a trainingbased channel estimation scheme at asymptotically high signaltonoise ratios (SNRs) is extended to finite SNRs. This extension is performed for a single input multiple output (SIMO) maximal ratio combining (MRC) scheme. This analysis at finite SNRs is more useful because in practice, the training schemes operate at finite SNRs and their impact on DMT is more relevant at such SNRs. We show the nonapplicability of the asymptotically high SNR relation, given by Zheng, to finite SNRs. We also show the equivalence of two existing trainingbased channel estimation schemes for any SIMO system, and using one of these, we compute the achievable finiteSNR DMT of the noncoherent SIMOMRC scheme for two modes of the training scheme. We analyze the achievable finiteSNR DMT for different durations of training, modes of the training scheme, and SNRs. We show that the impact of the mode of the training scheme on finiteSNR DMT decreases as SNR increases. We also show that at asymptotically high SNRs, the achievable DMT in both modes of the SIMOMRC scheme is equal to that of the noncoherent SIMO channel, as derived by Zheng.

