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Title:
CONSTITUTION METHOD FOR ADAPTIVE EQUALIZER USING NEURAL NETWORK AND VITERBI DECODER
Document Type and Number:
Japanese Patent JP2526400
Kind Code:
B2
Abstract:

PURPOSE: To perform highly efficient high quality digital data transmission even under a weak propagation environment by combining a neural network and a viterbi decoder.
CONSTITUTION: Reception demodulation signals pass through the forward direction calculation part 2-1 of the neural network 2 and are then inputted to the viterbi decoder 3. The output of the decoder 3 becomes decoded output and also the input of an encoder 4 and encoded again. The output of the encoder 4 becomes a reference signal for weight adjustment. In the meantime, a demodulation output value is supplied with time delay corresponding to the time delay of the decoder 3 by a delay line with a tap or a shift register 1 and becomes the input of the forward direction calculation part 2-2 of the network 2. A difference between the output of the calculator 2-2 and the decoder 4 is obtained and a differential signal is obtained. A weight is adjusted in a reverse direction calculation part 2-3 by the differential signal and signals reaching the viterbi decoder are calculated in the forward direction calculation part 2-1 by using the weight. The series of the operations is repeated.


Inventors:
岩崎 憲
Application Number:
JP1993000223854
Publication Date:
August 21, 1996
Filing Date:
August 17, 1993
Export Citation:
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Assignee:
郵政省通信総合研究所長
International Classes:
G06F15/18; G06N3/00; G06N3/08; H03M13/23; H04B3/06; H04B7/005; H04L25/08; H04L27/01; (IPC1-7): H04B7/005; G06F15/18; H03M13/12; H04L25/08; H04L27/01
Domestic Patent References:
JP48019A
JP4246906A
JP5267993A