ISSN : 1796-2021
Volume : 3    Issue : 1    Date : January 2008

Optimal MIMO UWB-IR Transceiver for Nakagami-fading and Poisson-Arrivals
Enzo Baccarelli, Mauro Biagi, Cristian Pelizzoni, and Nicola Cordeschi
Page(s): 27-40
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In this contribution, we develop a (novel) family of Multiple-Input Multiple-Output (MIMO) UWB
Impulse-Radio (UWB-IR) transceivers for Orthogonal PPMmodulated (OPPM) coded transmissions
over (baseband) multipath-faded MIMO channels. To by-pass expensive channel-estimation
procedures, the MIMO channel pathgains are assumed to be fully unknown at the receiver. Thus,
according to the UWB-IR statistical channel-models currently reported in the literature for both
indoor/outdoor application scenarios, we develop and analyze three versions of the resulting
noncoherent transceiver, that are optimal for Nakagami, Gaussian, and Log-normal distributed
channelgains, respectively. As dictated by the Saleh-Valenzuela (SV) UWB model, the resulting
noncoherent Maximum-Likelihood (ML) Decoder explicitly accounts for the Poissondistribution of the
path-arrivals. Hence, after analytically evaluating the performance of the proposed noncoherent
transceiver via suitable versions of the Union-Chernoff bound, we prove that the family of Space
Time OPPM (STOPPM) recently presented in the Literature is able to attain full-diversity in the
considered multipath-affected application scenario. To corroborate the carried out performance
analysis, we report several numerical results supporting both the medium/long coverage ranges
attained by the proposed STOPPM-coded noncoherent transceiver, and its performance robustness
against the degrading effects induced by Inter-Pulse-Interference (IPI), spatially-correlated multipath
fading and mistiming.

Index Terms
Dense-Multipath, UWB-IR MIMO channels, Space-Time Blocks Codes (STBCs), STOPPM codes,
Poisson-distributed arrivals, noncoherent Space-Time decoding, IPI.