Title:
RECEPTION EQUIPMENT IN SPREAD SPECTRUM COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JP3307217
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide the reception equipment of a spread spectrum system, which can receive data without the occurrence of a bit error even if a frequency and a phase are not strictly adjusted at the time of multiplying a signal transmitted on a carrier by the frequency on a reception side.
SOLUTION: A period wave outputted from an oscillator 215 is multiplied by an input signal 201 as an I phase wave and is multiplied by the input signal 201 as a Q phase wave which is phase-shifted by 90 degrees. The input signals which are multiplied by the I phase wave and the Q phase wave are respectively processed and are inputted to a correlation value/data value deciding circuit 214. The correlation value/data value deciding circuit 214 compares an 1 phase correlation value with a Q phase correlation value, and obtains and outputs the data of the phase having the larger value for avoiding the burst-like bit error occurring when the polarity of carrier offset generated by multiplying the I phase wave is inverted.
Inventors:
Hiroyuki Inuzuka
Application Number:
JP4506796A
Publication Date:
July 24, 2002
Filing Date:
March 01, 1996
Export Citation:
Assignee:
KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
International Classes:
H04B1/707; H04B1/709; (IPC1-7): H04B1/707
Domestic Patent References:
| JP7143025A | ||||
| JP7250008A |
Attorney, Agent or Firm:
Yoshiyuki Ohsuga
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