Multiuser Carrier Frequency Offset Estimation for OFDMA Uplink Based on Multi-Antenna

Weile ZHANG  Junsong WANG  Qinye YIN  Ang FENG  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.5   pp.1276-1279
Publication Date: 2010/05/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1276
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
OFDMA uplink,  CFO estimation,  rotation invariance,  space diversity,  

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In this letter, a novel method is proposed for carrier-frequency offset (CFO) estimation for multiple users in orthogonal frequency division multiple access (OFDMA) uplink with the generalized carrier assignment scheme (GCAS). The base station (BS) is equipped with multiple antennas, and each user's CFO can be estimated by the ESPRIT-like method that utilizes the rotation invariance of the space-domain snapshot matrix. The method is still effective even in fully loaded system with all subcarriers allocated to users. Simulation results illustrate the high performance of the proposed algorithm.