Title :
OFDM LINC transmitter with digital I/Q imbalance compensation
Author :
Azirar, A. ; Robertson, I.D.
Author_Institution :
Microwave Res. Group, Surrey Univ., Guildford, UK
Abstract :
It is well known that the performance of OFDM systems is severely affected by the nonlinearity of the power amplifier and the IQ imbalances of the vector modulators in the transmitter. This paper presents measurement results at 1.8 GHz and demonstrates the ability of the LINC technique to reduce the nonlinear distortion of the power amplifier, with 15 dB reduction in spectral regrowth. In addition, a digital compensation technique for the IQ imbalance is used to achieve an additional 5 dB improvement.
Keywords :
OFDM modulation; millimetre wave power amplifiers; nonlinear distortion; radio transmitters; 1.8 GHz; 15 dB; 5 dB; LINC technique; OFDM LINC transmitter; digital IQ imbalance compensation; nonlinear distortion; orthogonal FDM; power amplifier; spectral regrowth; vector modulators; vector transmitter; Digital modulation; High power amplifiers; Interference; Microwave amplifiers; Nonlinear distortion; OFDM modulation; Peak to average power ratio; Power amplifiers; Transmitters; Wireless communication;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1339067
