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Digital predistortion for mitigating transmitter-induced receiver desensitization in carrier aggregation FDD transceivers

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationProceedings of IEEE Global Conference on Signal and Information Processing
Place of PublicationWashington, DC
ISBN (Electronic)978-1-5090-4544-0
Publication statusPublished - 7 Dec 2016
Publication typeA4 Article in a conference publication
EventIEEE Global Conference on Signal and Information Processing -
Duration: 1 Jan 1900 → …


ConferenceIEEE Global Conference on Signal and Information Processing
Period1/01/00 → …


In frequency division duplexing (FDD) transceivers, the intermodulation distortion (IMD) created by a nonlinear transmit power amplifier can easily interfere with the receiver (RX) band. This is a particular concern in various carrier aggregation scenarios, and can cause severe own RX desensitization. In this paper, a spur-injection based sub-band digital predistortion (DPD) solution is proposed to mitigate this problem. Compared to earlier works, the proposed DPD parameter learning is performed using the main RX of the device, and thus it does not require an extra observation RX, which implies reduced costs and size. The proposed DPD is tested using computer simulations with practical models for the transmitter (TX) power amplifier and the TX/RX duplexer filters. The TX-induced IMD is suppressed by up to 25 dB at the own RX band, demonstrating a significant improvement in the RX signal-to-interference-and-noise-ratio (SINR).

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