All-Digital Cancellation Technique to Mitigate Receiver Desensitization in Uplink Carrier Aggregation in Cellular Handsets

被引：27

作者：

Dabag, Hayg-Taniel ^{[1
]}

Gheidi, Hamed ^{[1
]}

Farsi, Saeed ^{[2
]}

Gudem, Prasad S. ^{[3
]}

Asbeck, Peter M. ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA

[2] Katholieke Univ Leuven, Dept Elect Engn, B-3001 Louvain, Belgium

[3] Qualcomm Inc, San Diego, CA 92121 USA

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2013年 / 61卷 / 12期

关键词：

Adaptive filters; cross-modulation; intermodulation distortion; RLS; uplink carrier aggregation;

D O I：

10.1109/TMTT.2013.2287857

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：

Future handsets will employ uplink carrier aggregation to increase transmit data rates. This can lead to significant receiver desensitization for a number of LTE band combinations, because of the cross-modulation products created by the nonlinearity of antenna switches and duplexers in the RF front end. To mitigate this effect, an all-digital cancellation algorithm is proposed that relies solely on the digital representation of the signals, a peak covariance search for time alignment, and an adaptive distortion canceller. The recursive least squares (RLS) algorithm is used to find the optimal coefficients for the adaptive filter. Employing the distortion canceller improved the signal-to-interference-plus-noise ratio (SINR) and error-vector-magnitude (EVM) of the desired received signal by up to 20 dB.

引用

页码：4754 / 4765

页数：12

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