公开(公告)号：JP2003163612A

公开(公告)日：2003-06-06

申请号：JP2001358777

申请日：2001-11-26

Applicant: ATR ADVANCED TELECOMM RES INST

Inventor： TEI TAKASHI ,  OHIRA TAKASHI ,  WATANABE YOICHIRO

IPC: H03M13/47 ,  H04B1/707 ,  H04J13/00 ,  H04L1/00

Abstract: PROBLEM TO BE SOLVED: To correct errors of transmitted digital signals even when there is channel noise in a multiple access communication system. SOLUTION: Encoders 2-(i,j) Kronecker-multiply a Hadamard matrix of a prescribed order q with a prescribed spread spectrum sequence, generate the spread spectrum sequence of the result, multiply the generated spread spectrum sequence with inputted digital signals and output the multiplied result as encoded signals. A decoder 25 converts reception signals including a plurality of the encoded signals so as to be represented in the form of a matrix, multiplies the converted matrix by the Hadamard matrix, generates the matrix of the result, executes an error correction processing by changing respective components of the matrix so as to be a closest multiple of order q, calculates intermediate signal vectors for the respective encoded signals by dividing the error-corrected matrix by the order q and decodes the digital signals corresponding to the respective encoded signals from the calculated intermediate signal vectors. COPYRIGHT: (C)2003,JPO