The Analysis of Effect of Nonlinear Power Amplifier on Beamforming
In a transmit beamforming system, the power amplifier (PA) plays an important role of affecting performance and stability of this system, because most of systems’ nonlinearities are derived from the PA’s nonlinearities. Generally speaking, only the lower amplitude input can gain the better linearity of PA but poor efficiency; on the contrary, the higher efficiency always means the more deteriorated linearity of PA. It’s a dilemma to maintain both the efficiency and the nonlinearities of PA. Aiming to obtain a deeper understanding on this problem, this paper analyses the effect of nonlinear power amplifier on beam patterns of transmission arrays. Simulation results are also given for confirming the validity of the theoretical results.
KeywordsThe nonlinearities of PA The model of PA Transmit beamforming Beam pattern
This work is supported partly by the China Postdoctoral Science Foundation (No.2012M520077), by Science and Technology Foundation of Sichuan Province (No. 2013JY0004) and by the Fundamental Research Funds for the Central Universities of China (ZYGX2012J018).
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