What technology area does this patent fall under?

Primary CPC classification H04L1/0041. Mapped technology areas include Electricity.

When was this patent published?

Publication date Thu Oct 06 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.

What related patents are in patentsdb?

We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).

Modulator, demodulator, transmission device, and reception device

Patent metadata
Field	Value
Publication number	US-2016294507-A1
Application number	US-201415035537-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Nov 15, 2013
Publication date	Oct 6, 2016
Grant date	—

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Title
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Abstract
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Abstract

Official abstract text for this publication.

A modulator, demodulator, transmission device, and reception device for digital data that have excellent resistance to noise are provided. A modulator according to one aspect of this disclosure includes a modulation mapper ( 15 ) that performs 16APSK mapping at a radius ratio of 2.87 when the LDPC code rate is 93/120. A modulator according to another aspect of this disclosure includes a modulation mapper ( 15 ) that performs 32APSK mapping at a second inner circle to first inner circle radius ratio of 2.87 and an outer circle to first inner circle radius ratio of 5.33 when the LDPC code rate is 93/120. The modulator is included in a transmission device ( 1 ) according to this disclosure. A demodulator according to this disclosure includes a quadrature detector ( 21 ) that performs demodulation corresponding to the modulator. The demodulator is included in a reception device ( 2 ) according to this disclosure.

First claim

Opening claim text (preview).

1 . A modulator that modulates symbols, formed on a basis of a signal encoded with an LDPC code of a predetermined code rate, by 16APSK in which 12 constellation points are allocated on an outer circle of radius R 2 , 4 constellation points are allocated on an inner circle of radius R 1 , where R 2 >R 1 , a phase interval between constellation points on the outer circle is 30°, a phase interval between constellation points on the inner circle is 90°, and 4 constellation points among the constellation points on the outer circle are disposed at phase angles of the 4 constellation points on the inner circle, wherein the modulator performs 16APSK mapping at a radius ratio R 2 /R 1 of 2.87 when the predetermined code rate is 93/120. 2 . A modulator that modulates symbols, formed on a basis of a signal encoded with an LDPC code of a predetermined code rate, by 32APSK in which 16 constellation points are allocated on an outer circle of radius R 3 , 4 constellation points are allocated on a first inner circle of radius R 1 , where R 3 >R 1 , 12 constellation points are allocated on a second inner circle of radius R 2 , where R 2 >R 1 , a phase interval between constellation points on the outer circle is 22.5°, a phase interval between constellation points on the first inner circle is 90°, a phase interval between constellation points on the second inner circle is 30°, and 4 constellation points among the constellation points on the second inner circle and 4 constellation points among the constellation points on the outer circle are disposed at phase angles of the 4 constellation points on the first inner circle, wherein the modulator performs 32APSK mapping at a radius ratio R 2 /R 1 of 2.87 and a radius ratio R 3 /R 1 of 5.33 when the predetermined code rate is 93/120. 3 . A transmission device comprising the modulator of claim 1 . 4 . A transmission device comprising the modulator of claim 2 . 5 . A transmission device comprising: the modulator of claim 1 ; and an encoder configured to apply LDPC encoding to digital data using a unique check matrix for each code rate by using a check matrix in which, taking a check matrix initial value table established in advance for each code rate at a code length of 44880 bits as initial values, 1 entries of a partial matrix corresponding to an information length appropriate for a code rate of 93/120 are allocated in a column direction over a cycle of 374 columns. 6 . A transmission device comprising: the modulator of claim 2 ; and an encoder configured to apply LDPC encoding to digital data using a unique check matrix for each code rate by using a check matrix in which, taking a check matrix initial value table established in advance for each code rate at a code length of 44880 bits as initial values, 1 entries of a partial matrix corresponding to an information length appropriate for a code rate of 93/120 are allocated in a column direction over a cycle of 374 columns. 7 . The transmission device of claim 5 , wherein the check matrix initial value table for the code rate of 93/120 consists of the following table: [Check Matrix Initial Value Table for Code Rate of 93/120] 521 781 2081 2419 3589 5877 6085 6267 6657 1769 2029 2315 5799 6215 7255 7281 7385 9361 547 651 1873 2159 2471 7671 8581 8659 8919 2107 3069 3953 4851 5851 8555 9113 8815 9049 131 4935 5038 5565 6406 7515 7593 8074 7905 495 1821 2705 3095 3485 7459 8452 8503 8841 638 880 2073 2426 5014 6475 7307 8968 9179 27 910 2731 3199 4915 7923 8061 9543 9595 869 3081 3396 4109 6137 6345 7320 7880 8619 2226 1979 2178 4701 5331 6423 9738 9224 9491 2353 2937 4337 3458 4496 4375 4889 9532 9725 9138 1381 1809 1449 1535 4655 8303 8113 8269 4855 7552 6470 8936 7994 7002 9233 9174 9647 1991 6823 3584 6083 6115 5899 7302 7463 8529 2777 2603 2707 3615 3823 5123 6995 9153 573 1941 7936 7524 7112 7047 9023 9673 1892 1847 2689 7176 7661 8559 7801 9465 7764 7894 7957 3756 5481 8893 3403 7657

Assignees

Japan Broadcasting Corp

Inventors

Classifications

H03M13/152
Bose-Chaudhuri-Hocquenghem [BCH] codes · CPC title
H04L27/34
Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems · CPC title
H04L1/0071
Use of interleaving (interleaving per se H03M13/27) · CPC title
H04L27/38
Demodulator circuits; Receiver circuits · CPC title
H03M13/1102
Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes · CPC title

Patent family

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View patent family 53057095

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What does patent US2016294507A1 cover?: A modulator, demodulator, transmission device, and reception device for digital data that have excellent resistance to noise are provided. A modulator according to one aspect of this disclosure includes a modulation mapper ( 15 ) that performs 16APSK mapping at a radius ratio of 2.87 when the LDPC code rate is 93/120. A modulator according to another aspect of this disclosure includes a modulat…
Who is the assignee on this patent?: Japan Broadcasting Corp
What technology area does this patent fall under?: Primary CPC classification H04L1/0041. Mapped technology areas include Electricity.
When was this patent published?: Publication date Thu Oct 06 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
What related patents are in patentsdb?: We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).