Digital I/Q imbalance compensation in a low-IF receiver
- 27 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 3, 1461-1466 vol.3
- https://doi.org/10.1109/glocom.1998.776582
Abstract
Double low-IF receiver architectures avoid the need for expensive image-reject and channel selection filters and so reduce cost. This approach however introduces the need for an accurate in-phase and quadrature version of the first local oscillator. We present a way to digitally measure amplitude and phase imbalances and compensate for them. Simulations show image-reject values round 50 dB with amplitude imbalances of more than 10% and phase imbalances of more than 10 degrees. Although we focus on GSM-like applications, the algorithms are suitable for other low-IF systems as well.Keywords
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