NDLI: Investigation of Two-Dimensional Orthogonal Sequence Mapping to Multi-Layer Reference Signal for LTE-Advanced Downlink

Content Provider	IEEE Xplore Digital Library
Author	Takeda, K. Kishiyama, Y. Tanno, M. Nakamura, T.
Copyright Year	2010
Abstract	In the LTE-Advanced downlink, to satisfy high-level performance requirements, advanced multi-antenna transmission techniques such as higher-order single-user (SU)-MIMO, multi-user (MU)-MIMO, and coordinated multi-point transmission/reception (CoMP) are key. At the 3GPP RAN WG1 meeting, the demodulation reference signal (DM-RS) was defined to support channel estimation and data demodulation for up to eight transmission layers. A hybrid code division multiplexing (CDM) and frequency division multiplexing (FDM) scheme was adopted as a DM-RS multiplexing scheme. The time-domain orthogonal cover code (OCC) is used for CDM since time domain orthogonality among OCCs is relatively robust against channel variation. However, in a medium-to-high mobility environment, orthogonality distortion occurs among OCCs, which results in performance degradation. In this paper, we propose a two-dimensional (2D) OCC that achieves two-dimensional orthogonality in the time and frequency domains to improve the performance of CDM-based DM-RSs while reducing the peak transmit power of each OFDM symbol where CDM-based DM-RS are mapped. Simulation results show that the 2D OCC is effective in improving the block error rate performance especially in a medium-to-high mobility environment. Furthermore, it is shown that the proposed 2D OCC effectively reduces the peak transmit power compared to the time-domain OCC.
Starting Page	1
Ending Page	5
File Size	379009
Page Count	5
File Format	PDF
ISBN	9781424435739
ISSN	10903038
DOI	10.1109/VETECF.2010.5594395
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-06
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Frequency domain analysis Time domain analysis Downlink Channel estimation MIMO Frequency division multiplexing
Content Type	Text
Resource Type	Article

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