Iterative Precoding Scheme for Downlink OFDMA System with Carrier-Frequency Offset

Min HUANG
Ming ZHAO
Shidong ZHOU
Jing WANG

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B    No.9    pp.2613-2616
Publication Date: 2007/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.9.2613
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
orthogonal frequency-division multiplex access (OFDMA),  downlink,  carrier-frequency offset (CFO),  precoding,  iterative,  

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Summary: 
In orthogonal frequency-division multiplex access (OFDMA) downlink systems, the carrier-frequency offset (CFO) between the multiple transceivers introduces inter-carrier interference (ICI). In this letter, we propose an iterative precoding scheme to suppress the ICI due to CFO. This scheme is applied at the transmitter, and can jointly cancel the ICI for all the receivers. Moreover, by the studies of the convergence behavior of the iterations, a sufficient condition for the convergence is presented. The theoretical analysis and simulation results both show that this iterative scheme is equivalent to the zero-forcing (ZF) scheme in function, but with much lower complexity.