Linearization of Power Amplifiers Using the Reverse MM-LINC Technique

Abstract

A new mode-multiplexing linear amplification with nonlinear components (MM-LINC) technique is proposed in this brief. This technique, which is referred to as reverse MM-LINC, consists of using linear amplification with nonlinear components (LINC) hardware, along with two signal decomposition modes, depending on the power of the input signal. This decomposition guarantees acceptable linearity of the signal when the power amplifiers (PAs) are operating at their full power potential. This linearity improvement requires only relatively light computational complexity, which makes this technique a suitable alternative to digital predistortion for mobile and medium-power wireless transmitters. The implementation of the reverse MM-LINC concept for mobile WiMAX applications showed an improvement of 15 dB in the adjacent channel power ratio and a reduction in the error vector magnitude from 10% to 2.2%, when compared with a nonlinearized class-AB PA operating at full power potential. At this operation point, the efficiency of the reverse MM-LINC amplification system was not significantly different from the efficiency of the class-AB PA.

Markov mode-multiplexing mode in OFDM outphasing transmitters

“…Among these dual-branch systems, the most popular are the Doherty amplifier, the envelope elimination and restoration (EER) techniques, the linear amplification with nonlinear components (LINC), and the modified implementation of the LINC (MILC technique) [1][2][3]. This paper presents a complete design and experimental implementation of a new Mode-Multiplexing LINC technique [4,5] in order to enhance the efficiency with a reduced spectral regrowth. The paper is outlined as follows.…”

“…Finally, some conclusions about this work are provided in Section 6. efficiency is taken into account. Therefore, some techniques, like the Mode-Multiplexing method (MM-LINC), have been proposed either to improve combiner efficiency or linearity (Reverse Mode, RM-LINC) [4]. Figure 1 shows a schematic diagram of the ModeMultiplexing LINC structure (MM-LINC).…”

Impact of PA class on reconstruction filters sizing for a WCDMA base station LINC transmitter

“…Chireix combiner with efficient PAs presents the best efficiency at the expense of linearity degradation that can be recovered by predistorsion [7]. The solution based on the Wilkinson combiner is more linear but less efficient: multi level LINC solutions are then proposed [8]. Few papers are dealing with the sizing of the baseband part of the transmitter, constituted by the DACs and reconstruction filters [10].…”

New estimation and compensation method for quadrature modulator and demodulator errors in digital predistortion system

“…However, the signals generated by those modulation schemes have high peak-to-average power ratio (PAPR), and transmitting such high PAPR signals through nonlinear PA results in spectral regrowth and degradation of the bit error rate, which means that the high linearity PAs are necessary in modern wireless communication systems. There are many methods to linearize the nonlinear PA, such as the feedforward, negative feedback, linear amplification with nonlinear components [1][2][3], digital predistortion (DPD) [4][5][6][7], and so on. Among those linearization methods, DPD is an effective method to compensate for nonlinear PA, which is regarded as a promising linearization technology due to its simplicity, flexibility, bandwidth capability, and adaptability.…”