Title:
MULTI-TRANSMITTER COMMUNICATION SYSTEM EMPLOYING ANTI-PHASE PILOT SIGNALS
Document Type and Number:
WIPO Patent Application WO2004093326
Kind Code:
A3
Abstract:
Base station transmitter signals are combined more effectively through the use of anti-phase pilots between pairs of transmission paths. At the combiner (118), the pilots will cancel when the amplitude, phase, and delay of the two transmission paths entering the combiner are matched. As a result, the pilots will not appear at the output except when the alignment is incorrect. By detecting the residual pilot at the combiner output, the information is used to adjust the alignment of one of the transmission paths to match the other. The adjustments to the amplitude, phase, and delay are performed on the input signal, after the pilot injection.
Inventors:
BRAITHWAITE RICHARD NEIL (US)
Application Number:
PCT/US2004/010681
Publication Date:
July 07, 2005
Filing Date:
April 07, 2004
Export Citation:
Assignee:
POWERWAVE TECHNOLOGIES INC (US)
BRAITHWAITE RICHARD NEIL (US)
BRAITHWAITE RICHARD NEIL (US)
International Classes:
H04B1/04; H04B7/06; H04B7/155; H04B15/00; H04K1/00; H04B; (IPC1-7): H04K1/00; H04B15/00
Foreign References:
| US6553211B1 | 2003-04-22 | |||
| US6674324B1 | 2004-01-06 | |||
| US20020008577A1 | 2002-01-24 | |||
| US6208204B1 | 2001-03-27 |
Other References:
See also references of EP 1614244A4
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