Trained Space-Time Block Decoding for Flat Fading Channels with Frequency Offsets

Authors:
Petre Stoica;Girish Ganesan
Affiliations:
Department of Systems and Control, Information Technology, Uppsala University, P.O. Box 337, SE-751 05, Uppsala, Sweden;Department of Systems and Control, Information Technology, Uppsala University, P.O. Box 337, SE-751 05, Uppsala, Sweden E-mail: Girish.Ganesan@syscon.uu.se
Venue:
Wireless Personal Communications: An International Journal
Year:
2003

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Abstract

Space-time block coding (STBC) is a recent appealing solution to the problemof exploitingtransmit diversity in multi-antenna systems for communications over flatfading channels.In a standard STBC scheme the receiver requires Channel State Information(CSI), which can be acquired via training at the expense of a reduced information rate.Alternatively, the requirement of CSI can be avoided altogether by using differentialencoding. The existing trained or differential schemes for STBC assume that the channel is time-invariant during the transmission of at least two data blocks. However,wireless channels may often be time varying owing to frequency offsets induced byeither Dopplershifts or carrier frequency mismatches. In this paper we present a simpletrained STBCscheme for fading channels with frequency offsets.