Semi-blind Joint Estimation for Frequency Offset and Channel in Multi-user MIMO-OFDM

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Zeng, Yonghong; Leyman, A. Rahim (Institute for Infocomm Research, A-STAR, Singapore)
Ng, Tung Sang (Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong)

A semi-blind method is proposed for simultaneously estimating the carrier frequency offsets (CFOs) and channels of an uplink multi-user MIMO-OFDM system. By incorporating the CFOs into the transmitted symbols and channels, the MIMO-OFDM with CFO is re-modeled into an MIMO-OFDM without CFO. The known blind method for channel estimation is then directly used for the re-modeled system to obtain the shaped channels with an ambiguity matrix. A dedicated pilot OFDM block for each user is then designed to resolve the CFOs and the ambiguity matrix. As a result, based on the second-order statistics (SOS) of the received signal and one pilot OFDM block, the CFOs and channels are found simultaneously.