Pulse or digital communications – Transmitters
Reexamination Certificate
2003-03-19
2008-12-23
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Transmitters
C370S319000, C370S320000, C370S330000, C370S342000, C370S345000, C370S347000, C333S150000, C333S151000, C333S152000, C333S153000, C333S154000, C333S155000
Reexamination Certificate
active
07469017
ABSTRACT:
The present invention discloses a double TRU (Transceiver Unit) (45). The output signals from the power amplifiers (64, 84) are combined to one common output signal provided to an antenna arrangement (91). A DSP (Digital Signal Processor) (52, 72) of each TRU (50, 70) comprises means for a constant-envelope modulation scheme (54, 74) and a non-constant envelope scheme (53, 73). The DSP:s (52, 72) select the modulation scheme according to modulation information (49, 69). In such a way, a switching between different modulation schemes can be performed even on a time-slot basis. For non-constant-envelope modulation, the modulated signal is separated into two component signals. Each TRU (50, 70) takes care of the amplification of one component. A phase compensation of at least one of the TRU:s (50, 70) is performed in order to correct for different paths of phases of the power amplifiers (64, 84). The non-constant envelope modulated signal can also be a multi-carrier signal, e.g. of two or more constant-envelope signals. Also a TCC (Transmitter Coherent Combining) operation is achievable.
REFERENCES:
patent: 5990734 (1999-11-01), Wright et al.
patent: 6748021 (2004-06-01), Daly
patent: 6799020 (2004-09-01), Heidmann et al.
patent: 7020215 (2006-03-01), Porco et al.
patent: 7184448 (2007-02-01), Moon et al.
patent: 1102392 (2001-05-01), None
Electronics & Communication Engineering Journal vol. 4/2001 Mann et al “Increasing the talk-time of mobile radios with efficient linear transmitter architectures”, pp. 70-71.
International Preliminary Examination Report mailed Feb. 24, 2004 in corresponding PCT Application No. PCT/SE03/000459.
International Search Report mailed Jun. 17, 2003 in corresponding PCT Application No. PCT/SE03/000459.
Granström Anders
Johansson Gunnar
Liu Shuwang
Nixon & Vanderhye P.C.
Patel Dhaval
Telefonaktiebolaget LM Ericsson (publ)
LandOfFree
Multimodulation transmitter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multimodulation transmitter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multimodulation transmitter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4036503