Title:
AUTOMATIC GAIN CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/120917
Kind Code:
A1
Abstract:
[Problem] To provide an automatic gain control device which is capable of effectively using the dynamic range of an A/D converter and which reduces occurrences of overflow in order to achieve better reception characteristics. [Solution] In this automatic gain control device, an average power detection circuit (13) detects the average power of a received signal in a specific period, a peak to average power ratio calculation circuit (14) calculates a peak to average power ratio value, a threshold calculation circuit (15) obtains the maximum peak to average power ratio (PAPR) so as to determine as a threshold the result of subtracting the value of the PAPR from the full scale value of an A/D converter (12), a gain control circuit (16) identifies the gain on the basis of the value of the average power and the determined threshold, and a variable gain amplifier (11) amplifies the received signal which is input using the identified gain.
Inventors:
ITO KEIJU (JP)
Application Number:
PCT/JP2012/050457
Publication Date:
September 13, 2012
Filing Date:
January 12, 2012
Export Citation:
Assignee:
HITACHI INT ELECTRIC INC (JP)
ITO KEIJU (JP)
ITO KEIJU (JP)
International Classes:
H03G3/20; H04B1/16; H03G3/30
Foreign References:
| JP2005323123A | 2005-11-17 |
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Claims: