US 9,813,090 B2
Transmission device and transmission method
Shingo Yamanouchi, Tokyo (JP)
Assigned to NEC CORPORATION, Minato-ku, Tokyo (JP)
Appl. No. 15/105,643
Filed by NEC CORPORATION, Tokyo (JP)
PCT Filed Dec. 12, 2014, PCT No. PCT/JP2014/006206
§ 371(c)(1), (2) Date Jun. 17, 2016,
PCT Pub. No. WO2015/093021, PCT Pub. Date Jun. 25, 2015.
Claims priority of application No. 2013-261930 (JP), filed on Dec. 19, 2013.
Prior Publication US 2016/0322993 A1, Nov. 3, 2016
Int. Cl. H04M 1/00 (2006.01); H04B 1/04 (2006.01); H03F 3/24 (2006.01); H03F 1/02 (2006.01); H03F 3/19 (2006.01); H04L 27/36 (2006.01); H03F 3/60 (2006.01); H04B 1/00 (2006.01)
CPC H04B 1/0483 (2013.01) [H03F 1/0294 (2013.01); H03F 3/19 (2013.01); H03F 3/24 (2013.01); H03F 3/245 (2013.01); H03F 3/602 (2013.01); H04L 27/36 (2013.01); H03F 2200/102 (2013.01); H03F 2200/336 (2013.01); H03F 2200/451 (2013.01); H04B 1/005 (2013.01); H04B 1/0067 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A transmission device for transmitting an RF signal of a plurality of bands, the transmission device comprising:
a modulator that generates a first constant-envelope signal and a second constant-envelope signal from each of baseband signals set for respective ones of the plurality of bands, the first constant-envelope signal and the second constant-envelope signal having different phases;
a power amplifier that amplifies each of the first constant-envelope signal and the second constant-envelope signal generated by the modulator; and
a combiner that combines the first constant-envelope signal and the second constant-envelope signal amplified by the power amplifier and generates an RF signal in which amplitude information contained in each of the baseband signals set for respective ones of the plurality of bands is restored,
wherein the modulator includes:
a plurality of baseband signal generators that generates the baseband signals set for respective ones of the plurality of bands; and
a plurality of constant-envelope signal generators that generates the first constant-envelope signals and the second constant-envelope signals for respective ones of the plurality of bands, based on the baseband signals set for respective ones of the plurality of bands;
wherein the power amplifier includes:
a first power amplifier that amplifies the first constant-envelope signal for each of the plurality of bands, and
a second power amplifier that amplifies the second constant-envelope signal for each of the plurality of bands; and
wherein the combiner combines the first envelop signals and the second envelop signals amplified by the first and second power amplifiers, and generates the RF signal in which amplitude information contained in each of the baseband signals set for respective ones of the plurality of bands is restored; and
wherein the modulator include, for each of the plurality of bands,
a quadrature modulator that generates a quadrature-modulated signal and outputs the quadrature-modulated signal to both of the first and second power amplifiers, the quadrature-modulated signal being an RF signal obtained by modulating a carrier wave of a band by the baseband signal corresponding to the band; and
a mode switch that selects one of the constant-envelop signal generator and the quadrature modulator as an output destination of the baseband corresponding to the band based on a preset determination criterion.