Automatic equalizer capable of effectively cancelling intersymbo

Details Automatic equalizer capable of effectively cancelling intersymbo Automatic equalizer capable of effectively cancelling intersymbo

1992-11-18

1994-07-05

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 14, 375 40, 375100, 3647242, H03H 730, H03H 740, H03K 5159

Patent

active

053274580

ABSTRACT:
In an automatic equalizer (20) connected to a demodulator section (14) to equalize a demodulated signal into an equalized signal as an output signal, first and second received signals are transmitted in common through a co-channel to the demodulator section. The first and the second received signals have first and second polarizations, respectively. The first and the second received signals are demodulated into first and second demodulated signals which have first and second data signals, respectively. A first equalizer section (31) equalizes the first data signal into a first equalized signal. A transversal filter (18) filters the second data signal into a filtered signal. In order to cancel a cross polarization interference, the subtracter (19) subtracts the filtered signal from the first equalized signal to produce an intermediate signal. In order to cancel an intersymbol interference, a second equalizer section (32) equalizes the intermediate signal into a second equalized signal which is outputted as the output signal.

REFERENCES:
patent: 4577330 (1986-03-01), Kavehrad
patent: 4631734 (1986-12-01), Foschini
patent: 4644562 (1987-02-01), Kavehrad et al.
patent: 4910468 (1990-03-01), Ohtsuka et al.
IEEE Journal On Selected Areas In Communication, vol. SAC-5, No. 3, Apr. 1987, pp. 484-492, M. Borgne, "A New Class of Adaptive Cross-Polarisation Interference Cancellers for Digital Radio Systems".
IEEE Global Telecommunications Conference Record, vol. 3, 1 Dec. 1986, pp. 1874-1878, M. Borgne, "Adaptive Receiver in Digital Radio Transmission Over Dually Polarized Fading Channels".
Hiroyuki Ohtsuka et al., "The SBS Control Algorithm of Cross Polarization Interference Canceller on Digital Radio Systems, The Transactions of the IEICE", vol. E73, No. 3, Mar. 1990, pp. 401-408.

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