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Multi-user MIMO channel estimation in the presence of carrier frequency offsets

: Schellmann, M.; Stanczak, S.


Institute of Electrical and Electronics Engineers -IEEE-:
39th Asilomar Conference on Signals, Systems and Computers 2005. Vol.1 : Pacific Grove, CA, 30 October - 2 November
Piscataway, NJ: IEEE, 2005
ISBN: 1-4244-0131-3
Asilomar Conference on Signals, Systems and Computers <39, 2005, Pacific Grove/Calif.>
Conference Paper
Fraunhofer HHI ()
channel estimation; mimo system; multiuser channels; radio link; source separation; time-domain analysis

During the uplink of a multi-user MIMO system, a compensation of different users' carrier frequency offsets (CFOs) at the receiver's side is possible only after the spatial separation of the single user signals. As spatial separation requires knowledge of the communication channel, this issue longs for a channel estimation scheme capable to estimate the channel from received sequences that are distorted by CFOs from different users. We propose orthogonal sequences to be used as pilots for the simultaneous estimation of all user channels in the time-domain, which satisfy this requirement.