A unified message-passing algorithm for MIMO-SDMA in software-defined radio

被引:0
作者
Alexander Kocian
Mihai-Alin Badiu
Bernard Henri Fleury
Francesca Martelli
Paolo Santi
机构
[1] University of Pisa,Department of Computer Science
[2] Aalborg University,Department of Electronic Systems
[3] National Research Council,Istituto di Informatica e Telematica
[4] Massachusetts Institute of Technology,SENSEable City Lab
来源
EURASIP Journal on Wireless Communications and Networking | / 2017卷
关键词
MIMO communications; Space division multiple access; Belief propagation; Mean field approximation; Factor graphs; Software-defined radios;
D O I
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学科分类号
摘要
This paper presents a novel software radio implementation for joint channel estimation, data decoding, and noise variance estimation in multiple-input multiple-output (MIMO) space division multiple access (SDMA). In contrast to many other iterative solutions, the proposed receiver is derived within the theoretical framework of a unified message-passing algorithm, combining belief propagation (BP) and the mean field approximation (MF) on the corresponding factor graph. The algorithm minimizes the region-based variational free energy in the system under appropriate conditions and, hence, converges to a fixpoint. As a use-case, we consider the high-rate packet-oriented IEEE 802.11n standard. Our receiver is implemented on a software-defined radio platform dubbed MIMONet, composed of a GNU radio software component and a universal software radio peripheral (USRP). The receiver was evaluated in real indoor environments. 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 87. Therefore, the trade-off between communication performance and receiver complexity should be carefully evaluated in practical settings.
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