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Amplifier predistortion technology research

Author: KongFei
Tutor: TangXiaoHong
School: University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Amplifier WCDMA Predistortion Linearization TOI
CLC: TN722.75
Type: Master's thesis
Year: 2011
Downloads: 112
Quote: 0
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Abstract


The rapid development of communication technology in the world today , it has brought great convenience to people's lives , but also brought a new problem is that the communication channels become more and more crowded and tensions between different communication systems in order to prevent unnecessary interference, the communication system must be a certain degree of linear processing . Power amplifier is a radio frequency wireless communication system , the key member , and its existence is to produce a nonlinear distortion of the important reasons ; and linear modulation techniques are non - constant envelope and having a very high peak to average ratio (PAR) of such makes them very sensitive amplifier nonlinear . All these reasons have all contributed to the power amplifier linearization techniques to become one of the key technologies of wireless communication system , and pre-distortion technology precisely amplifier linearization techniques important and promising one . In this article , I introduced a power amplifier linearization principle focuses on the pre-distortion technology , including the analog predistortion technology and digital pre-distortion technology . Analog pre- distortion section, the design and implementation for the WCDMA standard, the downlink frequency (2.11-2.17GHz) power distributor , power synthesizer , microwave power transfer controllable phase shifters , microwave electric tone attenuator , the predistorter eventual realization of the structure is simple , compact and easy to adjust the analog predistortion system amplifier linearization . The TOI coefficients of this system is better than -50dBc, more improved than before linearization of third-order intermodulation coefficient 33dB ; digital predistortion ADS establish its simulation circuit model for RF pre-distortion for various baseband predistortion algorithm model , Matlab programming, simulation , and complex LMS algorithm - based memory polynomial predistortion build its FPGA hardware implementation model using DSP BUILDER .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Amplification technology,the amplifier > Amplifier > Amplifiers: the role of sub- > Power amplifier
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