Title:
ENCODED MULTIVALUED MODULATION SYSTEM FOR DIGITAL MOBILE COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JP3466797
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To attain the reliable and fast radio transmission of a large capacity of information even in an environment where multipath fading, shadowing, etc., exist.
SOLUTION: The state of a transmission line is estimated by a state of transmission line estimating device 10 and based on this estimating result FS of the state of the transmission line, a speed converter 31 adaptively vary-sets the number of signal groups (i) to be served for mapping by means of an adaptive multivalued modulation mapping circuit 4 as it is without serving to convolution encoding by means of a convolution encoder 32, and an adaptive multivalued modulation mapping circuit 4 adaptively selects and set a modulating system corresponding to the result of estimating the state of the transmission line. Then the groups of digital signals whose number of groups is adaptively vary-set are mapped corresponding to the adaptively select-set modulation system and transmitted.
Inventors:
Hirokazu Tanaka
Application Number:
JP29107095A
Publication Date:
November 17, 2003
Filing Date:
November 09, 1995
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H03M5/20; H03M13/23; H04B7/005; H04B7/26; H04L27/18; H04L27/34; (IPC1-7): H04L27/18; H03M5/20; H03M13/23; H04B7/005; H04B7/26; H04L27/34
Domestic Patent References:
| JP5183439A | ||||
| JP7250116A | ||||
| JP614075A | ||||
| JP2288752A | ||||
| JP7288556A | ||||
| JP5327787A |
Other References:
Ｓｉａｖａｓｈ Ｍ．Ａｌａｍｏｕｔｉ，Ｓａｍｉｒ Ｋａｌｌｅｌ，Ａｄａｐｔｉｖｅ Ｔｒｅｌｌｉｓ−Ｃｏｄｅｄ Ｍｕｌｔｉｐｌｅ−Ｐｈａｓｅ−Ｓｈｉｆｔ Ｋｅｙｉｎｇ ｆｏｒ Ｒａｙｌｅｉｇｈ Ｆａｄｉｎｇ Ｃｈａｎｎｅｌｓ，ＩＥＥＥ ＴＲＡＮＳＡＣＴＩＯＮＳ ＯＮ ＣＯＭＭＵＮＩＣＡＴＩＯＮＳ，１９９４年 ６月，ＶＯＬ．４２，ＮＯ．６，ｐ．２３０５−２３１４
Attorney, Agent or Firm:
Takehiko Suzue
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