The Linearity-Efficiency Compromise

Lavrador, Pedro M.; Cunha, Telmo R.; Cabral, Pedro M.; Pedro, José C.

doi:10.1109/mmm.2010.937100

Cited by 99 publications

(47 citation statements)

References 68 publications

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“…However, high efficiency and high linearity are conflicting requirements in PAs [4]. In fact, electronic devices/systems can not provide constant gain (i.e.…”

Section: Power Amplifier Efficiency Versus Linearitymentioning

confidence: 99%

Energy Efficient Wireless Networks Towards Green Communications

Sanctis

Cianca

Joshi

2011

Wireless Pers Commun

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Wireless networks have become an essential part of the modern life. However, currently, 3% of the world-wide energy is consumed by the ICT infrastructures which causes about 2% of the world-wide CO 2 emissions. The transmitted data-volume increases rapidly and wireless communications are used extensively while network design rules have practically ignored the energy efficient network design approach to limit CO 2 emissions. This approach is currently named Green Communications. Significant energy savings in mobile networks can be expected by defining and standardizing energy efficiency metrics and combining energy aware flexible radios and networks. This paper discusses several techniques such as cross layer approach, multiple antennas, cell size reduction and cognitive radio, from the system-wide energy efficiency point of view, outlining challenges and open issues.

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“…However, high efficiency and high linearity are conflicting requirements in PAs [4]. In fact, electronic devices/systems can not provide constant gain (i.e.…”

Section: Power Amplifier Efficiency Versus Linearitymentioning

confidence: 99%

Energy Efficient Wireless Networks Towards Green Communications

Sanctis

Cianca

Joshi

2011

Wireless Pers Commun

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“…The comparison between η (1) PA + RMN (k 1 , P in ) and PA drain efficiency without the RMN (Fig. 3) allows to obtain a preliminary glimpse on a suitable input power (29 dBm in this work) in order to maximize efficiency with the RMN at a certain frequency.…”

Section: Optimization Algorithm and Measurements Resultsmentioning

confidence: 99%

“…The efficiency-linearity trade-off is a very challenging aspect in the design of radiofrequency (RF) front-ends in modern communication systems [1,2]. Many techniques have been proposed to improve the efficiency of the power stages in the wireless RF front-ends, such as Doherty amplifiers [3], envelope tracking [4], or linear amplification with nonlinear components (LINC) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Efficiency enhancement by reconfigurable matching networks in LINC transmitters

Mateo

Carro

García-Dúcar

et al. 2017

J Wireless Com Network

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This paper proposes the use of a transmitter based on a linear amplification with nonlinear components (LINC) architecture, in which the reconfigurable matching networks (RMNs) are included. By varying the RMN active cell number, it is possible to change the load impedance at the power amplifier (PA) output, improving the amplifier drain efficiency and therefore the efficiency of the whole system. A long-term evolution (LTE) downlink signal with a bandwidth of 1.4 MHz and a peak-to-average power ratio (PAPR) of 11.48 dB is applied in order to carry out the experiments. Results show that the use of the RMNs in a LINC architecture improves the efficiency at all tested frequencies, especially at 927 MHz reaching an enhancement of 36.50%. Regarding the distortion, the adjacent channel leakage ratio (ACLR) values increase in all cases, with an improvement of 3.5 dB at 958 MHz. Finally, in terms of error vector magnitude (EVM), the proposed architecture offers a value of 1.96% at 927 MHz.

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“…Recent trends in efficient and linear PA research are mainly focusing on the use of two-branch amplifier systems and moving away from the classical single-ended amplifier topology combined with the use of digital predistortion techniques. 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.…”

Section: Introductionmentioning

confidence: 99%

Markov mode-multiplexing mode in OFDM outphasing transmitters

Carro

García-Dúcar

Mingo

et al. 2018

J Wireless Com Network

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Outphasing transmitters have been explored to study the trade-off between linearity and efficiency. The outphasing technique enhances efficiency by operating two amplifiers at lower output amplitudes, using two constant envelope signals. Their major drawback is the inherent sensitivity to gain and phase imbalances between the two amplifier branches. Another important issue is related to the degradation of efficiency, especially in isolated combiners. This paper presents a Statistical Markov-Chain Mode-Multiplexing (MM) transmitter which combines features of the MM and Reverse MM-LINC. Commercial analog devices and a digital platform for signal processing purposes are used to test the performance with an orthogonal frequency multiplexing modulation (OFDM), which is one of the most used modulation schemes in wireless communication systems.

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The Linearity-Efficiency Compromise

Cited by 99 publications

References 68 publications

Energy Efficient Wireless Networks Towards Green Communications

Energy Efficient Wireless Networks Towards Green Communications

Efficiency enhancement by reconfigurable matching networks in LINC transmitters

Markov mode-multiplexing mode in OFDM outphasing transmitters

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