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Wireless MIMO switching: network‐coded MMSE relaying and user group selection
Author(s) -
Wang Fanggang
Publication year - 2014
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.2585
Subject(s) - mimo , telecommunications link , computer science , minimum mean square error , relay , multi user mimo , computer network , dirty paper coding , channel state information , channel (broadcasting) , wireless , linear network coding , broadcasting (networking) , real time computing , telecommunications , precoding , mathematics , statistics , estimator , power (physics) , physics , quantum mechanics , network packet
A wireless relay that forms a one‐to‐one mapping from the inputs (uplinks) to the outputs (downlinks) is called a multiple‐input multiple‐output (MIMO) switch. The MIMO switch carries out precode‐and‐forward , where all users send their signals in the uplink, and then, the MIMO switch precodes the received vector signal for broadcasting in the downlink. Ideally, each user employs a receive filter to recover its desired signal from one other user with no or little interference from other users. We first propose a joint design of the precoder and the receive filters to achieve the minimum‐mean‐ square‐error (MMSE), where network coding technique is incorporated, assuming that full channel state information is available at the relay. When the number of relay antennas is smaller than the number of source users, that is, the users that need to transmit signals, we investigate user group selection algorithms for the proposed MMSE relaying schemes. Our results indicate that the proposed MMSE relaying scheme outperforms the existing zero‐forcing/MMSE schemes. In addition, the results validate the efficiency of the proposed user group selection algorithms. Copyright © 2012 John Wiley & Sons, Ltd.