Title :
Characterizing the effects of nonlinear amplifiers on linear modulation for digital portable radio communications
Author :
Ariyavisitakul, Sirikiat ; Liu, Ting-ping
Author_Institution :
Bellcore, Red Bank, NJ, USA
fDate :
11/1/1990 12:00:00 AM
Abstract :
The design and performance of linear modulation techniques and RF power amplifiers are discussed. Various types of power amplifier are used in the comparison, using simulation, of out-of-band radiation and power efficiency. The designs focus on high-frequency silicon bipolar power amplifiers suitable for low-power portable radio applications. Two different 4-QAM (4-level quadrature amplitude modulation) schemes are compared. Power efficiency as high as 40% can be achieved using a dynamically biased amplifier operating near saturation. The effects of nonlinear distortions from power amplifiers on adjacent channel interference as well as bit and block error rate performance are also investigated
Keywords :
amplitude modulation; digital radio systems; mobile radio systems; phase shift keying; power amplifiers; radiofrequency amplifiers; 4-QAM; 4-level quadrature amplitude modulation; 40 percent; QPSK; RF power amplifiers; adjacent channel interference; bit error rate; block error rate; digital portable radio communications; linear modulation; nonlinear amplifiers; nonlinear distortions; out-of-band radiation; power efficiency; Error analysis; High power amplifiers; Interchannel interference; Nonlinear distortion; Power amplifiers; Quadrature amplitude modulation; Quadrature phase shift keying; Radio frequency; Radiofrequency amplifiers; Silicon;
Journal_Title :
Vehicular Technology, IEEE Transactions on
