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A Unified Message Passing Algorithm for MIMO-SDMA in Software Defined Radio

MIMO-OFDM is considered a promising technology to improve spectrum efficiency in wireless communications, which is especially important to accommodate the exponentially increasing data traffic demand. Recently, a number of advanced, iterative receiver designs have been proposed to optimize the performance of MIMO-OFDM systems, including approaches based on variational Bayesian inference, like belief propagation (BP) and mean-field (MF) approximation, or combination thereof (BP-MF). However, to our best knowledge the performance of such advanced receivers has been estimated only theoretically, or by means of numerical simulations in which the channel conditions faithfully resemble those assumed when designing the receiver. In real-world scenarios, the channel conditions hardly follow those mimicked by radio channel models, suggesting that practical performance of advanced MIMO-OFDM receivers might significantly differ from the performance obtained in theoretical/numerical assessments. In this paper, we study for the first time the performance of an iterative BP-MF MIMO-OFDM receiver in real-world conditions. The receiver has been implemented in our MIMONet software-defined-radio platform. The results of our study clearly show that, once synchronization issues are properly addressed, the BP-MF receiver provides a substantial performance improvement compared to a conventional receiver also in real-world settings. Such improvement comes at the expense of an increase in running time that can be as high as two orders of magnitude, indicating that, in practical settings, the tradeoff between communication performance and receiver complexity should be carefully evaluated.
Eurasip Journal of Wireless Communication and Networking, 2017

Autori esterni: Alexander Kocian (University of Pisa), Mihai Badiu (Aalborg University), Bernard Fleury (Aalborg University)
Autori IIT:

Tipo: Contributo in rivista non ISI
Area di disciplina: Information Technology and Communication Systems

File: core.pdf

Attività: Algoritmica per reti wireless