Pre-equalization for MIMO wireless channels with delay spread


Hemanth Sampath, Helmut Bölcskei, and Arogyaswami J. Paulraj


IEEE Vehicular Technology Conference (VTC) Fall, Boston (MA), Vol. 3, pp. 1175-1178, Sept. 2000.

DOI: 10.1109/VETECF.2000.886287

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We consider a downlink finite impulse response (FIR) multi-input multi-output (MIMO) wireless channel with L taps. It 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.


MIMO, wireless channels, pre-equalization, delay spread, angle spread

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