Concurrent Multi-Band Envelope Modulated Power Amplifier Linearized Using Extended Phase-Aligned DPD

被引：12
作者：
Kwan, Andrew K. [1 ]
Younes, Mayada [1 ,2 ]
Ghannouchi, Fadhel M. [1 ]
Zhang, Silong [3 ]
Chen, Wenhua [3 ,4 ]
Darraji, Ramzi [1 ]
Helaoui, Mohamed [1 ]
Hammi, Oualid [5 ]
机构：
[1] Schulich Sch Engn, iRadio Lab, Dept Elect & Comp Engn, Calgary, AB T2N 1N4, Canada
[2] Univ Alexandria, Dept Elect & Commun Engn, Alexandria 21544, Egypt
[3] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
[4] Tsinghua Univ, State Key Lab Microwave Commun, Beijing 100084, Peoples R China
[5] King Fahd Univ Petr & Minerals, Dept Elect Engn, Dhahran 31261, Saudi Arabia
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2014年 / 62卷 / 12期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Concurrent mode; digital predistortion (DPD); envelope tracking (ET); long term evolution (LTE)-advanced carrier aggregation; power amplifier (PA); DIGITAL PREDISTORTION; DISTORTION; MODEL; ARCHITECTURE;
D O I：
10.1109/TMTT.2014.2365816
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：
This paper reports an envelope tracking (ET) transmitter architecture for multi-band/widely-spaced carrier signals. Due to the bandwidth limitations of the envelope modulator, the dynamic supply voltage is controlled by combining the low frequency envelopes of the multi-inputs rather than the true composite envelope of the input signals. The ET transmitter is tested for dual-band and tri-band power amplifiers (PAs) operating in concurrent mode using various bandwidth carrier aggregated long term evolution (LTE) signals. The transmitter is linearized using a phase-aligned Volterra digital predistortion that considers the inter-modulation distortion (IMD) products around the carrier frequencies as well as the third-order IMD products in the tri-band case. Experimental results are shown to validate the proposed techniques for linearization and efficiency enhancement of the multi-band ET transmitter and compared to the case of fixed supply biasing of the PA.
引用
收藏
页码：3298 / 3308
页数：11
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