Performance Analysis of MIMO Relay Network via Propagation Measurement in L-Shaped Corridor Environment

Namzilp LERTWIRAM  Gia Khanh TRAN  Keiichi MIZUTANI  Kei SAKAGUCHI  Kiyomichi ARAKI  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.4   pp.1345-1356
Publication Date: 2012/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1345
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
MIMO relay network,  propagation measurement,  two-way relay,  cooperative relay,  relay location,  

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Setting relays can address the shadowing problem between a transmitter (Tx) and a receiver (Rx). Moreover, the Multiple-Input Multiple-Output (MIMO) technique has been introduced to improve wireless link capacity. The MIMO technique can be applied in relay network to enhance system performance. However, the efficiency of relaying schemes and relay placement have not been well investigated with experiment-based study. This paper provides a propagation measurement campaign of a MIMO two-hop relay network in 5 GHz band in an L-shaped corridor environment with various relay locations. Furthermore, this paper proposes a Relay Placement Estimation (RPE) scheme to identify the optimum relay location, i.e. the point at which the network performance is highest. Analysis results of channel capacity show that relaying technique is beneficial over direct transmission in strong shadowing environment while it is ineffective in non-shadowing environment. In addition, the optimum relay location estimated with the RPE scheme also agrees with the location where the network achieves the highest performance as identified by network capacity. Finally, the capacity analysis shows that two-way MIMO relay employing network coding has the best performance while cooperative relaying scheme is not effective due to shadowing effect weakening the signal strength of the direct link.