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Summary: SPATIAL PRECODER DESIGN FOR DIFFERENTIAL SPACE-TIME CODED SYSTEMS:
BASED ON FIXED PARAMETERS OF MIMO CHANNELSt
Tharaka A. Lamahewat, Van K Nguyenv, Thushara D Abhayapalat and Rodne A. Kennedyt
tDepartment of Information Engineering, The Australian National University, Canberra ACT 0200,
Australia. School of Engineering and Technology, Deakin University, Geelong, VIC 3217. Australia.
ABSTRACT
In this paper, we introduce the novel idea of linear spatial precod-
ing based on fixed and known parameters ofMIMO channels to im-
prove the performance of differential space-time coding schemes.
Antenna spacing and antenna placements (geometry) are consid-
ered as fixed parameters of MIMO channels, which are known at
the transmitter. This new linear spatial precoding scheme exploits
the antenna placement information at both ends ofthe MIMO chan-
nel to ameliorate the effect of non-ideal antenna placement on the
performance of differential space-time coded systems. With this
design, the precoder is fixed for fixed antenna placement and the
transmitter does not require any feedback of channel state informa-
tion (partial or full) from the receiver. A second precoding scheme
is proposed by exploiting the non-isotropic scattering distribution
parameters ofthe scattering channel. Unlike in the first scheme, the
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