Abstract
Digital pre-distortion techniques are widely used in linearization of RF power amplifiers. In this paper Lookup-table (LUT) type Adaptive Digital pre-Distortion (ADPD) is presented. In this algorithm, an output signal of the Power Amplifier (PA) is used as reference signal. It is used to update the coefficients of the LUT, so that characteristics of the PA, such as temperature dependence, do not have influence on the convergence performances. Simulation results have been presented. Keywords: Digital pre-distortion (DPD), error vector magnitude (EVM), power amplifier (PA), look-up-table.
Highlights
The delayed sample of Introduction the undistorted input RF signal is compared with an Wideband signals such as those used in CDMA and attenuated sample of the power amplifier output
Error signal is amplified linearly to the required level they are subject to severe intermodulation distortion and is recombined with the output, following a delay line (IMD) when operated near saturation, cause in the main signal path, which compensates for the delay intermodulation products that interfere with adjacent and in the error amplifier
The resulting error signal is subtracted from the amplifier (PA) through several techniques such as feed amplifier output RF components
Summary
The polar table can be represented as:. Where represents gain and phase error respectively. In order to generate the output from. The polar table is converted back to IQ representation. The gain function obtained after polar to rectangular conversion from polar tables is identical to the gain function in IQ representation look-up table. This gain function is multiplied with modulated input signal
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