Title:
CDMA INTERFERENCE REMOVING DEVICE
Document Type and Number:
Japanese Patent JP2743912
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a code dividing multiplexing access CDMA) interference removing device suited to a blind form with satisfactory convergent characteristic.
SOLUTION: An orthogonal filter 101 executes inverse spread by an orthogonal coefficient independent from the fluctuation of a transmission path obtained by giving restricting condition processing to an inputted code multiplexing receiving signal by a desired wave spread code waveform, and detects the desired waveform of constant power while supressing an interference wave. A wave detector 102 executes the carrier phase synchronization of the detected waveform. A symbol judging device 103 judges the output of the wave detector 102 as a most probable symbol. An adder 104 extracts a symbol judging differential signal from the output of the device 103 and that of the wave detector 102. An orthogonal coefficient control means 105 adaptively controls the orthogonal coefficient based on the input of the filter 1, a reproducing carrier being the output of the wave detector 102, the symbol judging differential signal being the output of the adder and the desired wave spreading code waveform.
Inventors:
Naomasa Yoshida
Akihisa Gogawa
Akihisa Gogawa
Application Number:
JP13703296A
Publication Date:
April 28, 1998
Filing Date:
May 30, 1996
Export Citation:
Assignee:
NEC
International Classes:
H04J13/00; H04B1/10; H04B1/7097; (IPC1-7): H04J13/00; H04B1/10
Domestic Patent References:
| JP9162847A | ||||
| JP8335899A | ||||
| JP856213A |
Other References:
【文献】国際公開96/471(WO,A)
Attorney, Agent or Firm:
Wakabayashi Tadashi
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