Linearization and Efficiency Enhancement Techniques

Grebennikov, Andrei

doi:10.1002/9780470929308.ch12

Cited by 1 publication

(2 citation statements)

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“…The second approach is to use a linearization technique such as predistortion, feed-forward (FF), feedback, and envelope elimination and restoration approaches [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In the first approach, the amplifier is operated at a point further in the linear region, or equivalently, a point with a large power input back-off (IBO).…”

Section: Introductionmentioning

confidence: 99%

“…Although this approach reduces the nonlinear effects substantially, it comes at the expense of decreased power efficiency, which is unfavorable. The second approach is to use a linearization technique such as predistortion, feed-forward (FF), feedback, and envelope elimination and restoration approaches [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Out of these techniques, FF linearization has been the most attractive approach in OFDM systems because of the wideband nature of the analog circuitry used in manipulating the signals in the FF implementation [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Performance of feed‐forward linearizers of power amplifiers in OFDM systems under complex gain errors

Gharaibeh

Al-Zayed

2015

Int J Communication

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Adaptive feed-forward (FF) linearization schemes of power amplifiers provide high distortion cancelation and adjacent channel power ratio (ACPR) reduction. However, FF schemes are very sensitive to imbalances in the circuit parameters used to achieve signal cancelation. In this paper, an FF linearization circuit is analyzed using the orthogonalization of the nonlinear model and considering the effects of complex gain errors in the signal and distortion cancelation loops on the overall performance of the FF linearizer. The analysis enables the effective signal-to-distortion ratio (SDR) and ACPR to be estimated from FF circuit model. It is shown that complex gain errors in the distortion cancelation loop have a more significant effect on in-band distortion than out-of-band distortion, which means that the design of FF linearizers based on ACPR improvement is not optimal.

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