NDLI: Precoder Detection for Cooperative Decode-and-Forward Relaying in OFDMA Systems

Content Provider	IEEE Xplore Digital Library
Author	Valluri, A.K. La, R.J. Shayman, M.A.
Copyright Year	2014
Description	Author affiliation: Univ. of Maryland, College Park, MD, USA (Valluri, A.K.; La, R.J.; Shayman, M.A.)
Abstract	We consider an LTE network where a secondary user acts as a relay, transmitting data to the primary user using a decode-and-forward mechanism, transparent to the base station (eNodeB). Clearly, the relay can decode symbols more reliably if the employed precoder matrix indicators (PMIs) are known. However, for closed loop spatial multiplexing (CLSM) transmit mode, this information is not always embedded in the downlink signal, leading to a need for effective methods to determine the PMI. In this paper, we consider 2×2 MIMO and 4×4 MIMO downlink channels corresponding to CLSM and propose two techniques to estimate the PMI at the secondary user using a hypothesis testing framework. We evaluate their performance via simulations for various ITU channel models over a range of signal-to-noise ratio and for different channel quality indicators. We compare them to the case when the true PMI is known at the relay and show that the performance of the proposed schemes are within 2 dB at 10 percent block error rate for almost all the cases considered. Furthermore, the proposed algorithms add minimal computational overhead over the existent receiver structure.
Starting Page	1586
Ending Page	1594
File Size	314131
Page Count	9
File Format	PDF
ISBN	9781479967704
DOI	10.1109/MILCOM.2014.261
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-10-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Relays Transmitters Channel estimation Receivers Vectors Noise
Content Type	Text
Resource Type	Article

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