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: PDFPersonal VDE Members are entitled to a 10% discount on this title
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.