Power amplifiers linearization based on digital predistortion with memory effects used in CDMA applications

被引：17
作者：
Varahram, P. [1 ]
Jamuar, S. S. [1 ]
Mohammady, S. [1 ]
Hamidon, M. N. [1 ]
机构：
[1] Univ Putra Malaysia, Dept Elect Engn, Serdang, Malaysia
来源：
2007 EUROPEAN CONFERENCE ON CIRCUIT THEORY AND DESIGN, VOLS 1-3 | 2007年
关键词：
predistortion; ACPR; power amplifier; CDMA; memory effect;
D O I：
10.1109/ECCTD.2007.4529639
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Digital predistortion of a baseband signal is a well-known method of power amplifier (PA) linearization used to reduce adjacent channel interference (ACI) in a non constant envelope modulation system. This paper discusses the application of adaptive digital baseband predistortion linearization to radio frequency (RF) power amplifiers (PAs) that exhibit memory effects. This technique is a highly cost-effective way to linearize Power amplifiers (PAs), but most existing architectures assume that the PA has a memoryless nonlinearity. For wider bandwidth applications such as wideband code-division multiple access (WCDMA) or wideband orthogonal frequency-division multiplexing (W-OFDM), PA memory effects can no longer be ignored. In this paper a new technique for adaptation of digital predistorter that considers memory effects in power amplifiers is proposed. This method is a combination of two techniques, memory polynomial predistortion and slope-dependent method. This new technique is validated by using a 1.9 GHz 60W LDMOS power amplifier and various signals such as 2-carrier CDMA and 3-carrier CDMA.
引用
收藏
页码：488 / 491
页数：4
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