The inherent non-linearity of mixers is particularly acute in broadband receiver design for software defined radio (SDR) applications. Here, the receiver frontend ‘sees’ not only the wanted channel, but also a number of nearby signals. A conventional mixer will downconvert all of these received channels to IF, thus adding inband interference to the wanted channel. In this paper, known mixer linearisation schemes are explained and a new technique using frequency retranslation within a linearised mixer architecture is presented. Two-tone-test results from a prototype offered 33dB reduction in the distortion products and 22dB suppression of adjacent channel interference (ACI) for a π/4-DQPSK modulated carrier. A theoretical analysis is also carried out to demonstrate the amplitude and phase matching requirements of the technique.
|Translated title of the contribution||Mixer linearisation for software defined radio applications|
|Title of host publication||Vehicular Technology Conference 2002 (VTC 2002-Fall)|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||534 - 538|
|Number of pages||5|
|Publication status||Published - Sep 2002|
|Event||56th Vehicular Technology Conference 2002 (VTC 2002-Fall) - Vancouver, Canada|
Duration: 1 Sep 2002 → …
|Conference||56th Vehicular Technology Conference 2002 (VTC 2002-Fall)|
|Period||1/09/02 → …|
Bibliographical noteConference Proceedings/Title of Journal: IEEE 56th Vehicular Technology Conference, 2002 (VTC 2002-Fall)
Rose publication type: Conference contribution
Sponsorship: This paper is based upon work performed within the framework of the IST project IST-1999-12070 TRUST, partly funded by the European Union.
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- mixer linearisation
- SDR receiver frontend
- signal cancellation
- frequency retranslation