Pulse or digital communications – Equalizers – Automatic
Patent
1996-02-28
1999-07-06
Pham, Chi H.
Pulse or digital communications
Equalizers
Automatic
375376, H03H 740, H03D 324
Patent
active
059205954
ABSTRACT:
A method and apparatus for inter-cross wave compensation. There are provided a frequency conversion unit for performing frequency conversion for one of two received polarized wave signals, an analog/digital converter for converting the one of the polarized wave signals into a digital signal, a digital orthogonal detection unit for obtaining two orthogonal detection signals, and a digital equalizing unit for performing an equalizing process for outputs of the orthogonal detection unit. Further provided are a digital inter-cross wave compensating unit for receiving the other of the two received polarized wave signals as a digital signal and for outputting a signal used for compensating the output of the equalizing unit, and an adding unit for adding the output of the equalizing unit and the output of the digital inter-cross wave compensating unit. This structure allows a digital demodulation method to be applied to the inter-cross wave compensation, thereby making it possible to form the inter-cross wave compensating apparatus as an LSI and reducing the size and cost of the apparatus. In addition, inter-cross wave compensation can be easily performed even for polarized wave signals which are transmitted without synchronization during modulation for transmission.
REFERENCES:
patent: 5557646 (1996-09-01), Honma
patent: 5648988 (1997-07-01), Iwamatsu et al.
Fujitsu Limited
Luther William
Pham Chi H.
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