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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
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
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公开(公告)号：JP2003198233A
公开(公告)日：2003-07-11
申请号：JP2001396238
申请日：2001-12-27
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： TEI TAKASHI , HIRATA AKIHITO , OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To lean to improve performance by each repetition of search, without needing a long learning sequence signal, as compared with the conventional ones. SOLUTION: A method includes steps where an adaptive control type controller 20 randomly perturbs a bias voltage vector V (n), using a bias voltage value V m as one component from a specified initial value by means of a random vector R (n) generated by a random number generator, an objective function value J (n) which is an cross correlation coefficient for the bias voltage vector V (n) before perturbation is compared with an objective function value J (n+1), being a cross-correlation coefficient for the bias voltage vector V (n+1) after perturbation; a bias voltage value V m corresponding to the increase of the cross- correction coefficient before and after perturbation is selected and set and then the vector V (n) is randomly perturbed and set from the selected bias voltage of each of variable capacitance diodes 12-1 to 12-6; and this setting is repeated. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003188630A
公开(公告)日：2003-07-04
申请号：JP2001385391
申请日：2001-12-19
Applicant: ATR ADVANCED TELECOMM RES INST
Inventor： HIRATA AKIHITO , TEI TAKASHI , OHIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To perform adaptive control so that convergence time is significantly reduced, a main beam is directed to a wanted wave while null is directed to an interference wave with less calculation amount. SOLUTION: An adaptive control type controller 20 halves the range of reactance values which variable reactance elements 12 can take. The correlation factor between a reception signal and a learning sequence signal is calculated when a central value of each range after halving is set. The reactance value of each variable reactance element 12 corresponding to the larger correlation coefficient between two correlation coefficient corresponding to the central values of the ranges after halving is selected as an initial value. Then the range belonging to the selected reactance value is halved, and the correlation coefficient is calculated when the central values of the ranges after halving are set. The reactance value of the variable reactance element 12 corresponding to the larger correlation coefficient between the two correlation coefficient corresponding to the central values of the ranges after halving is selected. The latter process is repeated for adaptive control. COPYRIGHT: (C)2003,JPO
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