NDLI: Iterative detection in a multi-user cooperative OFDM system with carrier frequency offsets

Content Provider	IEEE Xplore Digital Library
Author	Hongyi Fu Yonghong Zeng Sumei Sun
Copyright Year	2009
Description	Author affiliation: Institute for Infocomm Research, 1 Fusionopolis Way, #21-01 Connexis, Singapore 138632 (Hongyi Fu; Yonghong Zeng; Sumei Sun)
Abstract	The problem of multi-user cooperation to achieve cooperative diversity for single-antenna terminals is considered. A cooperative strategy is proposed which divides multiple users into groups with each group having two users as partners. The two users alternately transmit their own information first, then simultaneously amplify and forward the partner's data in the same channel. Comparing to the conventional multi-user cooperation where the two users relay the partner's data in two orthogonal channels, the spectral efficiency of the proposed scheme is increased. However, as the two users relay the partner's data in the same channel, multi-user detection problem arises. An iterative detection making use of the new scheme's property is proposed in the presence of frequency offsets. The proposed scheme only requires time and frequency synchronization but no channel state information at the user terminals. To estimate the channel at the destination, a training scheme is proposed. The simulation results show that the proposed scheme can achieve the same cooperative diversity as the conventional scheme, while the spectral efficiency is lifted by 4/3.
Starting Page	1933
Ending Page	1937
File Size	268117
Page Count	5
File Format	PDF
ISBN	9781424451227
e-ISBN	9781424451234
DOI	10.1109/PIMRC.2009.5449820
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-13
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Relays Frequency conversion Access protocols Cooperative systems Signal processing Time division multiple access Frequency diversity Sun Multiuser detection
Content Type	Text
Resource Type	Article

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