| 摘要 |
The invention concerns a device for cancelling inter-symbol interference in a sampled digital signal. The device comprises a first filter (100) whereof the optimal transfer function is identical to that of the transmission channel and which receives a sequence of samples ({d SIMILAR <sb>n</sb>}<sb>n ELEMENT </sb>N) representing the digital signal emitted at the transmission channel input, a substracting circuit (110) for subtracting from the sequence of input samples ({r<sb>n</sb>}<sb> n ELEMENT </sb>N) the output ({d SIMILAR <sb>n</sb>}<sb>n ELEMENT </sb>N) of the first filter, a second filter (120) adapted to the transmission channel, whereof the optimal transfer function is H*(f), which receives the output ({e<sb>n</sb>}<sb>n ELEMENT </sb>N) of the substractor circuit (110), and an adder circuit (130) for adding the output of the second filter (120) with the sequence of samples ({d SIMILAR <sb>n</sb>}<sb>n ELEMENT </sb>N) representing the digital signal emitted at the input of said transmission channel thereby generating a sequence of complex symbols ({d APPROX <sb>n</sb>}<sb>n ELEMENT </sb>N) free of inter-symbol interference.
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