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Title:
REPEATER
Document Type and Number:
Japanese Patent JP2008211308
Kind Code:
A
Abstract:

To switch an identical-frequency repeater fast between an active system and a standby system without oscillating owing to characteristic differences of reception and transmission even when the level of a sneak wave is larger than the level of a master station and a D/U is 1.

The identical-frequency repeater having a receiving means, a sneak canceler, and a PA for each of the active system and standby system detects the D/U on the basis of the reception signal of the standby system, controls the transmission gain of the standby system to a stationary transmission gain during active system/standby system switching when the D/U is 1, and performs control to suppress and switch the gain of a PA portion of the standby system on the basis of the D/U when the D/U is 1 and to gradually increase it up to the stationary transmission gain.


Inventors:
NAKADA TATSUHIRO
TAKADA MASATOSHI
SAITO AKIRA
SAKATA MASASHI
ITO KEI
Application Number:
JP2007043691A
Publication Date:
September 11, 2008
Filing Date:
February 23, 2007
Export Citation:
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Assignee:
HITACHI INT ELECTRIC INC
International Classes:
H04B7/15; H04B1/74; H04H20/02; H04H20/67; H04H1/00; H04H3/00
Domestic Patent References:
JP2006020086A2006-01-19
JP2004048197A2004-02-12
JPS59169231A1984-09-25
JPS59189755A1984-10-27