Search International and National Patent Collections

1. (WO2017057164) DIGITAL TRANSMITTER

Pub. No.:    WO/2017/057164    International Application No.:    PCT/JP2016/077937
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Sat Sep 24 01:59:59 CEST 2016
IPC: H04L 27/00
H03F 3/217
H03F 3/68
H03M 7/32
Applicants: NEC CORPORATION
日本電気株式会社
Inventors: TANIO Masaaki
谷尾 真明
HORI Shinichi
堀 真一
YAMASE Tomoyuki
山瀬 知行
Title: DIGITAL TRANSMITTER
Abstract:
A digital RF signal generation unit of this digital transmitter digitally modulates an I-signal and a Q-signal, thereby converting the I-signal into a first digital RF signal having a bit rate twice as high as a carrier frequency, and the Q-signal into a second digital RF signal having a bit rate twice as high as the carrier frequency. On the basis of a clock signal having a frequency 4n (n is an integer) times as high as the carrier frequency, a retiming unit outputs the first digital RF signal with a delay and outputs the second digital RF signal after having delayed the phase thereof by 90 degrees with respect to the output of the first digital RF signal. A first amplifier amplifies the first digital RF signal output by the retiming unit. A second amplifier amplifies the second digital RF signal output by the retiming unit. A synthesizer generates a single signal sequence by combining the amplified first digital RF signal with the amplified second digital RF signal.