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Title:
MULTICARRIER MODULATION RECEIVER
Document Type and Number:
Japanese Patent JPH0974363
Kind Code:
A
Abstract:

To simplify the circuit of the AFC of a multicarrier modulation receiver by respectively independently obtaining the frequency deviation of local oscillation signals and multiplex signals from a demodulation means from the level of data to be outputted.

This receiver 11 mixes the multiplex signals received by an antenna 14 with output from a local oscillator 19 in multipliers 17 and 18 and performs quadrature transformation and frequency conversion. I signals and Q signals are respectively outputted from the multipliers 17 and 18, supplied to a demodulation circuit 30 and demodulated. Among demodulated output from the demodulation circuit 30, the demodulated output corresponding to the modulation wave of an evaluation object determined beforehand is supplied to an AFC processing circuit 41 along with the I signals and the Q signals. The AFC processing circuit 41 changes the frequency of the output from the local oscillator 19 within a detection range including the frequency of the modulation wave of the evaluation object and operates the value of a parameter (a) based on the demodulated output supplied from the demodulation circuit 30 every time. The local oscillator 19 is controlled so as to turn the frequency of the output for taking a maximum value among the plural computed values of the parameter (a) to the frequency of the output of the local oscillator 19.


Inventors:
SASAKI MITSURU
Application Number:
JP1995000226640
Publication Date:
March 18, 1997
Filing Date:
September 04, 1995
Export Citation:
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Assignee:
FUJITSU TEN LTD
International Classes:
H04J4/00; H04B1/16; H04J11/00; (IPC1-7): H04B1/16; H04J4/00; H04J11/00
Attorney, Agent or Firm:
西教 圭一郎



 
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