Title:
TRANSMITTER
Document Type and Number:
Japanese Patent JP3248807
Kind Code:
B2
Abstract:
PURPOSE: To form the transmission/reception system in which much more information at the same frequency band is sent by solving it that the impossibility of transmission information quantity cannot be increased when a frequency band is limited in the transmitter sending a digital signal.
CONSTITUTION: A modulator 4 implementing m-value QAM modulation in a transmitter 1 assigns n-value data of a 1st data string to a signal point group formed by grouping signal points of n-value 1st data string and p-value 2nd and 3rd data strings on a space diagram and sends a modified m-value QAM modulation signal. A demodulator 25 of a 1st receiver 23 demodulates the n- value 1st data string, a 2nd receiver 33 demodulates the 1st and 2nd data strings, a 3rd receiver 43 demodulates the 1st, 2nd and 3rd data strings, and even in the case of the receiver having only n-value demodulation capability of n<m demodulates data of the n-value 1st data string when the m-value modified multi-value modulation wave is received in the transmitter.
Inventors:
Mitsuaki Ohshima
Application Number:
JP7943294A
Publication Date:
January 21, 2002
Filing Date:
March 25, 1994
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H04N5/40; G11B20/10; H03M13/00; H04B1/68; H04B7/17; H04B7/204; H04B7/216; H04B7/26; H04B14/04; H04J11/00; H04L1/00; H04L1/22; H04L5/00; H04L5/06; H04L27/00; H04L27/02; H04L27/04; H04L27/18; H04L27/22; H04L27/26; H04L27/34; H04L27/36; H04L27/38; H04N5/44; H04N5/455; H04N5/46; H04N5/765; H04N5/7826; H04N7/015; H04N7/08; H04N7/081; H04N7/12; H04N7/20; H04N7/24; H04N19/89; H04N21/2383; H04N21/438; H04N21/647; (IPC1-7): H04J11/00; H04N7/015; H04N7/20
Domestic Patent References:
| JP4196822A | ||||
| JP5218978A |
Other References:
【文献】欧州特許506400(EP,B1)
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)