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

Author

Dabag, Hayg-Taniel ; Gheidi, H. ; Farsi, S. ; Gudem, Prasad ; Asbeck, P.M.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA

Volume

61

Issue

12

fYear

2013

fDate

Dec. 2013

Firstpage

4754

Lastpage

4765

Abstract

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.

Keywords

Long Term Evolution; radio receivers; EVM; LTE band combinations; RLS algorithm; SINR; adaptive distortion canceller; adaptive filter; all-digital cancellation algorithm; antenna switches; cellular handsets; covariance search; cross modulation products; duplexers; error vector magnitude; optimal coefficients; receiver desensitization mitigation; recursive least squares algorithm; signal to interference plus noise ratio; time alignment; transmit data rates; uplink carrier aggregation; Delays; Distortion measurement; Jamming; Nonlinear distortion; Receivers; Transmitters; Adaptive filters; RLS; cross-modulation; intermodulation distortion; uplink carrier aggregation;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2013.2287857

Filename

6668985