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Based on the third generation mobile communication for high efficiency linear power amplifier developed

Author: TangChao
Tutor: YangZuo
School: University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: PA Linear Technology Feedforward TOI coefficient Adaptive control
CLC: TN722.75
Type: Master's thesis
Year: 2008
Downloads: 260
Quote: 1
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Abstract


Third generation mobile communication systems (IMT-2000), is the second -generation mobile communication technology based on the further evolution of broadband CDMA technology -based, and can also provide voice and data services in the mobile communication system . WCDMA is the ITU approved four global 3G standards. WCDMA system by virtue of its greater capacity , better voice quality , higher spectral efficiency , faster data rates , a stronger anti-fading capability , better resistance to multipath and other characteristics of wideband code division multiple access will as International Mobile Telecommunications (IMT-2000 ╱ UMTS) best multiple access scheme . Because CDMA technology is immediately envelope wideband channel , if the usual high power amplifier will as intermodulation distortion effects produce spectral regrowth effect thereby interfering with adjacent channels , so the WCDMA base station system for PA linearity raised demanding, and also for cooling and other operational costs and base considerations, linearity to meet the requirements at the same time it should enhance the efficiency of the amplifier . Firstly, the nonlinear characteristics of the power amplifier and a variety of feedforward linearization technique particularly detailed theoretical analysis , but also introduces a novel feedforward system to compensate for the low efficiency of traditional feedforward system deficiencies . Finally, EDA simulation tool , designed a WCDMA-based adaptive feedforward amplifier system , and completed the circuit debugging and testing. Obtained by testing the system adaptive feedforward amplifier output power 20W dual-tone third-order intermodulation factor when nearly -50dBc, the results prove that this structure feedforward amplifier system, although there is a slight deterioration of linearity , but in theory have been met 3GPP WCDMA base station transmitter on the indicator. And the efficiency with conventional feedforward some improvement compared with the system .

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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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