Simplified complex LMS algorithm for the cancellation of second-order TX intermodulation distortions in homodyne receivers

Author

Lederer, Christian ; Huemer, Mario

Author_Institution

Inst. of Networked & Embedded Syst., Alpen-Adria-Univ. Klagenfurt, Klagenfurt, Austria

fYear

2011

fDate

6-9 Nov. 2011

Firstpage

533

Lastpage

537

Abstract

Intermodulation distortions are produced by a modulated blocker signal with a non-constant envelope travelling through non-linear analog stages. Especially in homodyne receivers (RX) the second-order intermodulation distortions (IMD2) are problematic since they overlay the wanted RX baseband signal. In this paper an approach to cancel the transmitter (TX) induced IMD2 in the digital domain is presented. Furthermore, it is shown that the cancellation of IMD2 can be performed independently for the in-phase (I) and quadrature (Q) component of the complex RX baseband signal. The performance of the proposed cancellation approach is verified on measured RX data of a UMTS transceiver chip.

Keywords

3G mobile communication; homodyne detection; interference suppression; intermodulation distortion; least mean squares methods; radio transceivers; TX induced IMD2 cancellation; UMTS transceiver chip; complex LMS algorithm; complex RX baseband signal; homodyne receivers; in-phase component; modulated blocker signal; nonconstant envelope; nonlinear analog stages; quadrature component; second-order TX intermodulation distortions; transmitter induced IMD2 cancellation; 3G mobile communication; Baseband; Intermodulation distortion; Noise; Receivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers (ASILOMAR), 2011 Conference Record of the Forty Fifth Asilomar Conference on

Conference_Location

Pacific Grove, CA

ISSN

1058-6393

Print_ISBN

978-1-4673-0321-7

Type

conf

DOI

10.1109/ACSSC.2011.6190058

Filename

6190058