Pre-equalization for MIMO wireless channels with delay spread

Author

Sampath, Hemanth ; Bölcskei, Helmut ; Paulraj, Arogyaswami J.

Author_Institution

Inf. Syst. Lab., Stanford Univ., CA, USA

Volume

3

fYear

2000

fDate

2000

Firstpage

1175

Abstract

We consider a downlink finite impulse response (FIR) multi-input multi-output (MIMO) wireless channel with L taps. A is shown that such a channel can be pre-equalized with an FIR MIMO transmit filter with only L taps, if the angle spread due to the different multipaths is sufficiently large at the transmitter. The filter taps are derived for the cases where the transmitter has perfect and partial channel knowledge, respectively. Finally, we present a pre-filter structure which converts the available frequency diversity into spatial diversity. The resulting spatial diversity can then be exploited using conventional receivers designed for frequency-flat fading channels

Keywords

FIR filters; MIMO systems; delays; diversity reception; equalisers; fading channels; filtering theory; multipath channels; radio links; radio receivers; radio transmitters; FIR MIMO transmit filter; FIR MIMO wireless channels; angle spread; delay spread; downlink wireless channel; filter taps; frequency diversity; frequency-flat fading channels; multi-input multi-output channel; multipaths; partial channel knowledge; perfect channel knowledge; pre-equalization; pre-filter structure; receivers; spatial diversity; transmitter; Delay; Downlink; Equalizers; Fading; Finite impulse response filter; Frequency diversity; Intersymbol interference; MIMO; OFDM; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd

Conference_Location

Boston, MA

ISSN

1090-3038

Print_ISBN

0-7803-6507-0

Type

conf

DOI

10.1109/VETECF.2000.886287

Filename

886287