Volume 6, Issue 3 (September 2010)                   IJEEE 2010, 6(3): 149-155 | Back to browse issues page

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Ghavami S, Abolhassani B. Effects of Non-Ideal Pre-Distorter High Power Amplifiers in WCDMA Using Multi-User Detectors. IJEEE 2010; 6 (3) :149-155
URL: http://ijeee.iust.ac.ir/article-1-316-en.html
Effects of Non-Ideal Pre-Distorter High Power Amplifiers in WCDMA Using Multi-User Detectors
S. Ghavami , B. Abolhassani
Abstract:   (12288 Views)
Wide band code division multiple access (WCDMA) signals, transmitted by the base station high power amplifiers (HPAs), show high peak to average power ratios (PAPR), which results in nonlinear distortions. In this paper, using computer simulations effect of using a predistorted HPA on the symbol error rate (SER) of multi-user detectors in terms of output back-off (OBO) in the transmit power is analyzed. As well, using polynomials for modeling predistorters to remove nonlinear distortions of traveling wave tube amplifiers (TWTAs) and of solid state power amplifiers (SSPAs), effect of different degrees of polynomials on the SER is investigated. Simulation results show that a polynomial of degree 4 is a sufficient degree polynomial, which fits to the AM/AM characteristic of the predistorter for TWTAs. As well, for solid state power amplifiers (SSPAs) with different p values, different approximations are considered and sufficient degree polynomials are found.
Keywords: WCDMA , HPA , MUD , Back off , PAPR , TWTA , SSPA
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Type of Study: Research Paper | Subject: Evolutionary Computation
Received: 2010/09/15 | Revised: 2010/09/15 | Accepted: 2013/12/30
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