Improvement of memory effects and ACPR of power amplifiers in CDMA cellular mobile and OFDM WLAN transmitters
Improvement of memory effects and ACPR of power amplifiers in CDMA cellular mobile and OFDM WLAN transmitters
In this article, improvement of the memory effects and adjacent channel interference introduced by the nonlinearity of the power amplifier in the both Code division multiple access (CDMA) and Orthogonal frequency division multiplexing based (OFDM) transmitters is evaluated through Feedforward linearization method. For CDMA system, more than 17.27 dB increasing in OIP3 is and at least 25 dB improvement in adjacent channel power ratio (ACPR) is obtained. For OFDM system, achieved improvement through Feedforward linearization method is at least 39.03 dB in third output intercept point (OIP3), more than 26.6 dB in ACPR and 5.44 dB in peak-toaverage ratio. It is observed that the designed Feedforward circuit can efficiently improve the nonlinearity caused by memory effects and saturation of the power amplifiers of CDMA cellular mobile telephony and OFDM wireless local area network (WLAN) transmitters.
CDMA, Feedforward, Memory effect, OFDM, Power amplifier, WLAN
340-347
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Tayarani, Majid
4017d891-574e-410f-886a-bc9394839939
2013
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Tayarani, Majid
4017d891-574e-410f-886a-bc9394839939
Taravati, Sajjad and Tayarani, Majid
(2013)
Improvement of memory effects and ACPR of power amplifiers in CDMA cellular mobile and OFDM WLAN transmitters.
International Journal on Electrical Engineering and Informatics, 5 (3), .
(doi:10.15676/ijeei.2013.5.3.7).
Abstract
In this article, improvement of the memory effects and adjacent channel interference introduced by the nonlinearity of the power amplifier in the both Code division multiple access (CDMA) and Orthogonal frequency division multiplexing based (OFDM) transmitters is evaluated through Feedforward linearization method. For CDMA system, more than 17.27 dB increasing in OIP3 is and at least 25 dB improvement in adjacent channel power ratio (ACPR) is obtained. For OFDM system, achieved improvement through Feedforward linearization method is at least 39.03 dB in third output intercept point (OIP3), more than 26.6 dB in ACPR and 5.44 dB in peak-toaverage ratio. It is observed that the designed Feedforward circuit can efficiently improve the nonlinearity caused by memory effects and saturation of the power amplifiers of CDMA cellular mobile telephony and OFDM wireless local area network (WLAN) transmitters.
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More information
Published date: 2013
Keywords:
CDMA, Feedforward, Memory effect, OFDM, Power amplifier, WLAN
Identifiers
Local EPrints ID: 482601
URI: http://eprints.soton.ac.uk/id/eprint/482601
ISSN: 2085-6830
PURE UUID: 77de333c-58b5-4a35-9b04-2afeeb13028f
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Date deposited: 10 Oct 2023 17:00
Last modified: 06 Jun 2024 02:19
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Contributors
Author:
Sajjad Taravati
Author:
Majid Tayarani
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