Multiple-input multiple-output (MIMO) systems using eigenbeam space division multiplexing (E-SDM) perform well and have increased channel capacities. However, channel state information (CSI) is required at a transmitter, and the performance of the systems depends much on the accuracy of the CSI at a transmitter and a receiver. In time-varying fading environments, the channel change between the transmission weight matrix determination time and the actual data transmission time causes the system performance to degrade. To compensate for the channel error, a linear extrapolation method has been proposed for a time division duplexing system. Unfortunately, the performance still deteriorates as the maximum Doppler frequency increases. Here, two new techniques of channel extrapolation are proposed. One is second order extrapolation, and the other is exponential extrapolation. Simulation results for 4tx 4rx MIMO systems show that using the proposed methods, E-SDM system performs better in a higher Doppler frequency region
[1]
M. J. Gans,et al.
On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas
,
1998,
Wirel. Pers. Commun..
[2]
Toshihiko Nishimura,et al.
High data-rate transmission with eigenbeam-space division multiplexing (E-SDM) in a MIMO channel
,
2002,
Proceedings IEEE 56th Vehicular Technology Conference.
[3]
Emre Telatar,et al.
Capacity of Multi-antenna Gaussian Channels
,
1999,
Eur. Trans. Telecommun..
[4]
T. Nishimura,et al.
Compensation of channel information error using first order extrapolation in eigenbeam space division multiplexing (E-SDM)
,
2005,
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005..
[5]
Andrew R Nix,et al.
A comparison of the HIPERLAN/2 and IEEE 802.11a wireless LAN standards
,
2002,
IEEE Commun. Mag..