Title :
A W-band high-power predistorted direct-conversion digital modulator for transmitter applications
Author :
Chang, Hong-Yeh ; Tsai, Jeng-Han ; Huang, Tian-Wei ; Wang, Huei ; Xia, Yongxiang ; Shu, Yonghui
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
This letter presents a W-band high-power direct-conversion transmitter using digital predistortion techniques for digital modulation applications. The transmitter is a direct-conversion configuration that employs a reflection-type IQ modulator module and a power amplifier module. With the predistortion function in digital signal processing (DSP), this transmitter demonstrated an output channel power of greater than 19 dBm, and the adjacent channel power ratio (ACPR) was improved by 10 and 18 dB for QPSK and π/4-DQPSK modulation, respectively. To the best of our knowledge, this is the first demonstration of linearization techniques for W-band high-power digital modulation transmitters.
Keywords :
linearisation techniques; modulators; quadrature amplitude modulation; quadrature phase shift keying; radio transmitters; π/4-DQPSK modulation; 10 dB; 18 dB; QPSK modulation; W-band digital modulation transmitter; W-band digital modulator; W-band direct-conversion transmitter; adjacent channel power ratio; digital modulation applications; digital predistortion technique; digital signal processing; direct-conversion configuration; direct-conversion digital modulator; high-power digital modulation transmitter; high-power digital modulator; linearization technique; power amplifier module; predistorted digital modulator; predistortion function; quadrature amplitude modulation; quadrature phase shift keying; reflection-type IQ modulator module; transmitter applications; Digital modulation; Digital signal processing; Linearity; Power amplifiers; Power generation; Predistortion; Quadrature phase shift keying; Radio frequency; Radio transmitters; Wireless LAN; Linearization; W-band direct-conversion transmitter; millimeter-wave (MMW); quadrature amplitude modulation (QAM); quadrature phase shift keying (QPSK);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.855382
